OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
•
JG OR P PACKAGE
(TOP VIEW)
Direct Replacements for PMI and LTC OP27
and OP37 Series
Features of OP27A, OP27C, OP37A, and
OP37C:
• Maximum Equivalent Input Noise Voltage:
3.8 nV/√Hz at 1 kHz
5.5 nV/√Hz at 10 kHz
• Very Low Peak-to-Peak Noise Voltage at
0.1 Hz to 10 Hz . . . 80 nV Typ
• Low Input Offset Voltage . . . 25 µV Max
• High Voltage Amplification . . . 1 V/µV Min
Feature of OP37 Series:
• Minimum Slew Rate . . . 11 V/µs
VIO TRIM
IN –
IN +
VCC –
1
8
2
7
3
6
4
5
VIO TRIM
VCC +
OUT
NC
NC
VIOTRIM
NC
NC
NC
FK PACKAGE
(TOP VIEW)
NC
1N –
NC
IN +
NC
description
3 2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
NC
VCC +
NC
OUT
NC
NC
VCC –
NC
VIOTRIM
NC
The OP27 and OP37 operational amplifiers
combine outstanding noise performance with
excellent precision and high-speed specifications.
The wideband noise is only 3 nV/√Hz and with the
1/f noise corner at 2.7 Hz, low noise is maintained
for all low-frequency applications.
The outstanding characteristics of the OP27 and
OP37 make these devices excellent choices
for low-noise amplifier applications requiring
precision performance and reliability. Additionally,
the OP37 is free of latch-up in high-gain,
large-capacitive-feedback configurations.
The OP27 series is compensated for unity gain.
The OP37 series is decompensated for increased
bandwidth and slew rate and is stable down to a
gain of 5.
The OP27A, OP27C, OP37A, and OP37C are
characterized for operation over the full military
temperature range of – 55°C to 125°C. The
OP27E, OP27G, OP37E, and OP37G are
characterized for operation from – 25°C to 85°C.
4
NC – No internal connection
symbol
IN +
IN –
3
2
+
6
OUT
–
1
8
VIO TRIM
Pin numbers are for the JG and P packages.
AVAILABLE OPTIONS
TA
VIOmax
AT 25°C
25 µV
– 25°C to 85°C
100 µV
25 µV
– 55°C to 125°C
100 µV
STABLE
GAIN
PACKAGE
CERAMIC DIP
(JG)
CHIP CARRIER
(FK)
PLASTIC DIP
(P)
1
—
—
OP27EP
5
—
—
OP37EP
1
—
—
OP27GP
5
—
—
OP37GP
1
OP27AJG
OP27AFK
—
5
OP37AJG
OP37AFK
—
1
OP27CJG
—
—
5
OP37CJG
—
—
Copyright  1994, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
• DALLAS, TEXAS 75265
• HOUSTON, TEXAS 77251–1443
POST OFFICE BOX 655303
POST OFFICE BOX 1443
2–1
† C1 = 120 pF for OP27
C1 = 15 pF for OP37
Q2A
Q1B Q2B
IN +
IN –
Q28
Q27
Q24
Q23
Q1A
Q26
Q12
C1†
Q22
480 µA
Q46
Q20
Q21
260
µA
750
µA
Q6
340
µA
120
µA
240 µA
Q45
Q11
VCC –
• HOUSTON,
• DALLAS,
POST
POST
OFFICE
OFFICE
BOXBOX
1443655303
TEXAS
TEXAS
77251–1443
75265
Q3
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED OPERATIONAL AMPLIFIER
VIO TRIM
VIO TRIM
VCC +
Q19
OUT
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–2
schematic
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC + (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 V
Supply voltage, VCC – (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 22 V
Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC ±
Duration of output short circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . unlimited
Differential input current (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 25 mA
Continuous power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range: OP27A, OP27C, OP37A, OP37C . . . . . . . . . . . . . . . – 55°C to 125°C
OP27E, OP27G, OP37E, OP37G . . . . . . . . . . . . . . . – 25°C to 85°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: JG or FK package . . . . . . . . . . . . . . 300°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds : P package . . . . . . . . . . . . . . . . . . . . 260°C
NOTES: 1. All voltage values are with respect to the midpoint between VCC + and VCC – unless otherwise noted.
2. The inputs are protected by back-to-back diodes. Current-limiting resistors are not used in order to achieve low noise. Excessive
input current will flow if a differential input voltage in excess of approximately ± 0.7 V is applied between the inputs unless some
limiting resistance is used.
DISSIPATION RATING TABLE
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 85°C
POWER RATING
TA = 125°C
POWER RATING
JG
FK
P
1050 mW
1375 mW
1000 mW
8.4 mW/°C
11.0 mW/°C
8.0 mW/°C
546 mW
715 mW
520 mW
210 mW
275 mW
N/A
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
•
2–3
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
recommended operating conditions
OP27A, OP37A
MIN
NOM
OP27C, OP37C
MAX
MIN
NOM
MAX
UNIT
Supply voltage, VCC +
4
15
22
4
15
22
V
Supply voltage, VCC –
–4
– 15
– 22
–4
– 15
– 22
V
Common mode input voltage,
Common-mode
voltage VIC
VCC ± = ± 15 V, TA = 25°C
VCC ± = ± 15 V, TA = – 55°C to 125°C
Operating free-air temperature, TA
± 11
± 11
± 10.3
± 10.2
– 55
125
V
– 55
125
°C
electrical characteristics at specified free-air temperature, VCC ± = ±15 V (unless otherwise noted)
PARAMETER
VIO
Input offset voltage
αVIO
Average temperature
coefficient of input
offset voltage
TA†
TEST CONDITIONS
VO = 0,,
RS = 50 Ω,
IIO
Input offset current
VO = 0
0,
VIC = 0
IIB
Input bias current
VO = 0
0,
VIC = 0
AVD
Large-signal
Large
signal differential
voltage amplification
RL ≥ 0.6 kΩ, VO = ± 1 V,
VCC± = ± 4 V
RL ≥ 2 kΩ,
ri(CM)
Common-mode input
resistance
ro
Output resistance
CMRR
Common-mode rejection
j
ratio
kSVR
Supply
y voltage
g rejection
j
ratio
VO = ± 10 V
VO = ± 10 V
VO = ± 10 V
Full range
30
100
300
µV/°C
0.2
1
0.4
2
µV/mo
7
35
12
75
±10
135
± 40
± 15
± 60
11
to
– 11
10.3
to
– 10.3
10.5
to
– 10.5
± 11.5
1800
800
1500
250
700
600
25°C
100
VCC ± = ± 4.5 V to ± 18 V
Full range
96
V
± 11.5 ± 13.5
± 10 ± 11.5
700
V
1500
1500
200
70
110
nA
500
V/mV
300
25°C
Full range
nA
10.5
1000
VIC = ± 10 V
VCC ± = ± 4 V to ± 18 V
± 80
± 150
11
to
– 11
114
µV
1.8
50
25°C
UNIT
0.4
3
VO = 0,
IO = 0
VIC = ± 11 V
MAX
0.6
± 10 ± 11.5
Full range
TYP
0.2
± 12 ± 13.8
RL ≥ 2 kΩ
MIN
60
25°C
RL ≥ 2 kΩ
RL ≥ 0.6 kΩ
RL ≥ 1 kΩ,
25
Full range
Full range
RL ≥ 2 kΩ,
10
Full range
Common-mode input
voltage range
Peak output voltage swing
MAX
25°C
25°C
OP27C, OP37C
TYP
Full range
Full range
See Note 4
VOM
MIN
25°C
VIC = 0
See Note 3
Long-term drift of input
offset voltage
VICR
OP27A, OP37A
126
100
2
GΩ
70
Ω
120
94
120
94
86
118
dB
dB
† Full range is – 55°C to 125°C.
NOTES: 3. Input offset voltage measurements are performed by automatic test equipment approximately 0.5 seconds after applying power.
4. Long-term drift of input offset voltage refers to the average trend line of offset voltage versus time over extended periods after the
first 30 days of operation. Excluding the initial hour of operation, changes in VIO during the first 30 days are typically 2.5 µV
(see Figure 3).
2–4
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
•
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
recommended operating conditions
Supply voltage, VCC +
Supply voltage, VCC –
VCC ± = ± 15 V,
VCC ± = ± 15 V,
Common mode input voltage,
Common-mode
voltage VIC
MIN
NOM
MAX
4
15
22
V
–4
– 15
– 22
V
± 11
TA = 25°C
TA = – 55°C to 125°C
V
± 10.5
Operating free-air temperature, TA
UNIT
– 25
85
°C
electrical characteristics at specified free-air temperature, VCC ± = ± 15 V (unless otherwise noted)
PARAMETER
VIO
Input offset voltage
αVIO
Average temperature
coefficient of input
offset voltage
TA†
TEST CONDITIONS
VO = 0,,
RS = 50 Ω,
25°C
VIC = 0
See Note 3
See Note 4
IIO
Input offset current
VO = 0
0,
VIC = 0
IIB
Input bias current
VO = 0
0,
VIC = 0
AVD
Large-signal
Large
signal differential
voltage amplification
ri(CM)
Common-mode input
resistance
ro
Output resistance
CMRR
Common-mode rejection
j
ratio
kSVR
Supply
y voltage
g rejection
j
ratio
Full range
VO = ± 10 V
VO = ± 10 V
RL ≥ 1 kΩ,
RL ≥ 0.6 kΩ, VO = ± 1 V,
VCC± = ± 4 V
RL ≥ 2 kΩ,
VO = ± 10 V
Full range
VO = 0,
IO = 0
VIC = ± 11 V
MAX
30
100
220
1.8
µV/°C
0.2
1
0.4
2
µV/mo
7
35
12
± 10
± 40
± 15
11
to
– 11
10.3
to
– 10.3
10.5
to
– 10.5
1800
800
1500
250
700
600
25°C
114
110
25°C
100
VCC ± = ± 4.5 V to ± 18 V
Full range
96
nA
nA
V
± 11.5 ± 13.5
± 10 ± 11.5
V
10.5
1000
Full range
± 80
± 150
11
to
– 11
± 11.5
75
135
± 60
VIC = ± 10 V
VCC ± = ± 4 V to ± 18 V
µV
0.4
50
25°C
UNIT
0.6
± 10 ± 11.5
RL ≥ 2 kΩ
TYP
0.2
± 12 ± 13.8
RL ≥ 0.6 kΩ
MIN
60
25°C
RL ≥ 2 kΩ
RL ≥ 2 kΩ,
25
Full range
Common-mode input
voltage range
Peak output voltage swing
10
25°C
Full range
VOM
MAX
Full range
25°C
OP27G, OP37G
TYP
Full range
Full range
Long-term drift of input
offset voltage
VICR
OP27E, OP37E
MIN
700
1500
1500
200
500
V/mV
450
3
2
GΩ
70
70
Ω
126
100
120
96
120
94
90
118
dB
dB
† Full range is – 25°C to 85°C.
NOTES: 3. Input offset voltage measurements are performed by automatic test equipment approximately 0.5 seconds after applying power.
4. Long-term drift of input offset voltage refers to the average trend line of offset voltage versus time over extended periods after the
first 30 days of operation. Excluding the initial hour of operation, changes in VIO during the first 30 days are typically 2.5 µV
(see Figure 3).
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
•
2–5
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
OP27 operating characteristics over operating free-air temperature range, VCC± = ±15 V
PARAMETER
SR
Slew rate
VN(PP)
Peak-to-peak equivalent
input noise voltage
TEST CONDITIONS
AVD ≥ 1,
RL ≥ 2 kΩ
f = 0.1 Hz to 10 Hz, RS = 20 Ω,
See Figure 34
In
Equivalent input noise voltage
Equivalent input noise current
Gain-bandwidth product
TYP
1.7
2.8
OP27C, OP27G
MAX
MIN
TYP
1.7
2.8
MAX
0.18
0.09
0.25
3.5
5.5
3.8
8
f = 30 Hz,
RS = 20 Ω
RS = 20 Ω
3.1
4.5
3.3
5.6
f = 1 kHz,
RS = 20 Ω
3
3.8
3.2
4.5
f = 10 Hz,
See Figure 35
1.5
4
1.5
f = 30 Hz,
See Figure 35
1
2.3
1
f = 1 kHz,
See Figure 35
0.4
0.6
0.4
f = 100 kHz
5
8
5
UNIT
V/µs
0.08
f = 10 Hz,
Vn
OP27A, OP27E
MIN
µV
nV/√Hz
pA/√Hz
0.6
8
MHz
OP37 operating characteristics over operating free-air temperature range, VCC± = ±15 V
PARAMETER
SR
Slew rate
VN(PP)
Peak-to-peak equivalent
input noise voltage
Vn
Equivalent
E
i l t input
i
t noise
i
voltage
TEST CONDITIONS
AVD ≥ 5,
RL ≥ 2 kΩ
f = 0.1 Hz to 10 Hz, RS = 20 Ω,
See Figure 34
Equivalent input noise current
Gain bandwidth product
Gain-bandwidth
2–6
MIN
TYP
11
17
OP37C, OP37G
MAX
MIN
TYP
11
17
0.08
0.18
0.09
MAX
0.25
RS = 20 Ω
RS = 20 Ω
3.5
5.5
3.8
8
3.1
4.5
3.3
5.6
f = 1 kHz,
RS = 20 Ω
3
3.8
3.2
4.5
1.5
f = 10 Hz,
See Figure 35
1.5
4
f = 30 Hz,
See Figure 35
1
2.3
1
f = 1 kHz,
See Figure 35
0.4
0.6
0.4
f = 10 kHz
AV ≥ 5,
45
f = 1 MHz
•
63
40
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
•
45
63
40
UNIT
V/µs
f = 30 Hz,
f = 10 Hz,
In
OP37A, OP37E
µV
nV/√Hz
pA/√Hz
0.6
MHz
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
VIO
Input offset voltage
vs Temperature
1
∆VIO
Change in input offset voltage
vs Time after power on
vs Time (long-term drift)
2
3
IIO
IIB
Input offset current
vs Temperature
4
Input bias current
vs Temperature
5
VICR
VOM
Common-mode input voltage range
vs Supply voltage
6
Maximum peak output voltage
vs Load resistance
7
VO(PP)
Maximum peak-to-peak output voltage
vs Frequency
AVD
Differential voltage amplification
vs Supply voltage
vs Load resistance
vs Frequency
CMRR
Common-mode rejection ratio
vs Frequency
15
kSVR
Supply voltage rejection ratio
vs Frequency
16
SR
Slew rate
vs Temperature
vs Supply voltage
vs Load resistance
17
18
19
φm
φ
Phase margin
vs Temperature
20, 21
Phase shift
vs Frequency
12, 13
Vn
Equivalent input noise voltage
vs Bandwidth
vs Source resistance
vs Supply voltage
vs Temperature
vs Frequency
In
Equivalent input noise current
vs Frequency
Gain-bandwidth product
vs Temperature
Short-circuit output current
vs Time
Supply current
vs Supply voltage
Pulse response
Small signal
Large signal
IOS
ICC
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
•
8, 9
10
11
12, 13, 14
22
23
24
25
26
27
20, 21
28
29
30, 32
31, 33
2–7
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
TYPICAL CHARACTERISTICS†
INPUT OFFSET VOLTAGE OF
REPRESENTATIVE INDIVIDUAL UNITS
vs
FREE-AIR TEMPERATURE
WARM-UP CHANGE IN
INPUT OFFSET VOLTAGE
vs
ELAPSED TIME
100
VCC ± = ± 15 V
∆V IO – Change in Input Offset Voltage – µV
80
VIO – Input Offset Voltage – µV
OP27C/37C
60
40
OP27A/37A
OP27A/37A
20
0
OP27E/37E
– 20
– 40
OP27G/37G
OP27C/37C
– 60
– 80
– 100
– 50
– 25
0
25
50
75
100
VCC ± = ± 15 V
TA = 25°C
10
OP27CP/GP
OP37CP/GP
5
OP27AP/EP
OP37AP/EP
0
125
1
TA – Free-Air Temperature – °C
2
3
Time After Power On – minutes
Figure 1
Figure 2
LONG-TERM DRIFT OF INPUT OFFSET VOLTAGE OF
REPRESENTATIVE INDIVIDUAL UNITS
∆V IO – Change in Input Offset Voltage – µV
6
0.2-µV/mo Trend Line
4
2
0
–2
–4
0.2-µV/mo Trend Line
–6
0
1
2
3
4
5
6
7
8
Time – months
Figure 3
† Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
2–8
4
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
•
5
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
TYPICAL CHARACTERISTICS†
INPUT OFFSET CURRENT
vs
FREE-AIR TEMPERATURE
INPUT BIAS CURRENT
vs
FREE-AIR TEMPERATURE
± 50
50
I IO – Input Offset Current – nA
VCC ± = ± 15 V
I IB – Input Bias Current – nA
40
30
20
OP27C/G
OP37C/G
10
VCC ± = ± 15 V
± 40
± 30
OP27C/G
OP37C/G
± 20
± 10
OP27A/E
OP37A/E
0
– 75
– 50
OP27A/E
OP37A/E
– 25
0
25
50
75
100
0
– 75
125
– 50 – 25
TA – Free-Air Temperature – °C
50
75
100
125
Figure 5
COMMON-MODE INPUT VOLTAGE RANGE LIMITS
vs
SUPPLY VOLTAGE
MAXIMUM PEAK OUTPUT VOLTAGE
vs
LOAD RESISTANCE
20
16
TA = – 55°C
VOM – Maximum Peak Output Voltage – V
VVICR
ICR – Common-Mode Input Voltage Range Limits – V
25
TA – Free-Air Temperature – °C
Figure 4
12
TA = 25°C
8
4
TA = 125°C
0
–4
TA = – 55°C
–8
ÁÁ
ÁÁ
ÁÁ
0
TA = 25°C
– 12
TA = 125°C
– 16
0
±5
±10
± 15
18
VCC ± = ± 15 V
TA = 25°C
16
14
Positive
Swing
12
10
Negative
Swing
8
6
4
2
0
± 20
0.1
VCC + – Supply Voltage – V
1
10
RL – Load Resistance – kΩ
Figure 6
Figure 7
† Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
•
2–9
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
OP27
OP37
MAXIMUM PEAK-TO-PEAK
OUTPUT VOLTAGE
vs
FREQUENCY
MAXIMUM PEAK-TO-PEAK
OUTPUT VOLTAGE
vs
FREQUENCY
VV
OPP – Maximum Peak-to-Peak Output Voltage – V
O(PP)
VV
OPP – Maximum Peak-to-Peak Output Voltage – V
O(PP)
TYPICAL CHARACTERISTICS
28
VCC ± = ± 15 V
RL = 1 kΩ
TA = 25°C
24
20
16
12
ÁÁ
ÁÁ
ÁÁ
ÁÁ
8
4
0
1k
10 k
100 k
1M
f – Frequency – Hz
10 M
28
VCC ± = ± 15 V
RL = 1 kΩ
TA = 25°C
24
20
16
12
ÁÁ
ÁÁ
ÁÁ
ÁÁ
8
4
0
10 k
100 k
1M
f – Frequency – Hz
Figure 9
OP27A, OP27E, OP37A, OP37E
OP27A, OP27E, OP37A, OP37E
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
TOTAL SUPPLY VOLTAGE
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
LOAD RESISTANCE
2500
2400
A VD – Differential Voltage Amplification – V/mV
A VD – Differential Voltage Amplification – V/mV
Figure 8
VO = ± 10 V
TA = 25°C
2000
RL = 2 kΩ
1500
RL = 1 kΩ
1000
500
0
0
10
20
30
40
50
2200
2000
VCC ± = ± 15 V
VO = ± 10 V
TA = 25°C
1800
1600
1400
1200
1000
800
600
400
0.1
VCC + – VCC – – Total Supply Voltage – V
1
10
RL – Load Resistance – kΩ
Figure 10
2–10
10 M
Figure 11
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•
100
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
OP27
OP37
LARGE-SIGNAL DIFFERENTIAL
VOLTAGE AMPLIFICATION AND PHASE SHIFT
vs
FREQUENCY
LARGE-SIGNAL DIFFERENTIAL
VOLTAGE AMPLIFICATION AND PHASE SHIFT
vs
FREQUENCY
20
15
120°
Phase Shift
φ m = 70°
10
140°
ÁÁ
ÁÁ
5
160°
0
180°
AVD
–5
200°
– 10
220°
100
10
f – Frequency – Hz
1
80°
60
Phase Shift
VCC ± =± 15 V
RL = 1 kΩ
TA = 25°C
50
100°
120°
40
AVD
30
140°
φ m = 71°
Á
Á
20
160°
10
180°
0
200°
– 10
0.1
220°
100
1
10
f – Frequency – MHz
Figure 12
φ – Phase Shift
80°
VCC ± = ± 15 V
RL = 1 kΩ
100°
TA = 25°C
φ – Phase Shift
25
A VD – Differential Voltage Amplification – dB
A VD – Differential Voltage Amplification – dB
TYPICAL CHARACTERISTICS
Figure 13
OP27A, OP27E, OP37A, OP37E
OP27A, OP27E, OP37A, OP37E
COMMON-MODE REJECTION RATIO
vs
FREQUENCY
140
140
VCC ± = ± 15 V
RL = 2 kΩ
TA = 25°C
120
CMRR – Common-Mode Rejection Ratio – dB
A VD – Differential Voltage Amplification – dB
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
FREQUENCY
100
80
OP37A/E
60
40
OP27A/E
20
0
– 20
0.1
1
10
100 1 k 10 k
f – Frequency – Hz
1M
120
100
OP37A/E
80
OP27A/E
60
40
1k
100 M
VCC ± = ± 15 V
VIC = ± 10 V
TA = 25°C
10 k
100 k
1M
10 M
f – Frenquency – Hz
Figure 14
Figure 15
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•
2–11
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
TYPICAL CHARACTERISTICS†
SUPPLY VOLTAGE REJECTION RATIO
vs
FREQUENCY
SLEW RATE
vs
FREE-AIR TEMPERATURE
20
VCC ± = ± 4 V to ± 18 V
TA = 25°C
140
18
VCC ± = ± 15 V
RL ≥ 2 kΩ
OP37
(AVD ≥ 5)
16
120
100
SR – Slew Rate – V/ µ s
kSVR – Supply Voltage Rejection Ratio – dB
160
Negative
Supply
80
60
14
12
10
8
6
40
20
0
4
Positive
Supply
1
10
100
1k
2
10 k 100 k 1 M
0
– 50
10 M 100 M
OP27
(AVD ≥ 1)
– 25
f – Frequency – Hz
Figure 16
OP37
OP37
SLEW RATE
vs
SUPPLY VOLTAGE
SLEW RATE
vs
LOAD RESISTANCE
19
Rise
Fall
15
SR – Slew Rate – V/ µ s
SR – Slew Rate – V/ µ s
AVD = 5
RL = 2 kΩ
TA = 25°C
10
5
18
VCC ± = ± 15 V
AVD = 5
VO(PP) = 20 V
TA = 25°C
17
16
±6
±9
± 12
± 15
± 18
15
0.1
± 21
VCC ± – Supply Voltage – V
Figure 18
1
10
f – Frequency – Hz
Figure 19
† Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
2–12
125
Figure 17
20
0
±3
0
25
50
75
100
TA – Free Air Temperature – °C
•
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•
100
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
TYPICAL CHARACTERISTICS†
OP27
OP37
PHASE MARGIN AND
GAIN-BANDWIDTH PRODUCT
vs
FREE-AIR TEMPERATURE
PHASE MARGIN AND
GAIN-BANDWIDTH PRODUCT
vs
FREE-AIR TEMPERATURE
Φ – Phase Margin
φm
75°
φm
80°
10.6
75°
10.2
70°
80
65°
75
60°
70
70°
9.8
65°
9.4
ÁÁ
ÁÁ
60°
9
55°
8.6
50°
8.2
GBW (f = 100 kHz)
45°
7.8
40°
7.4
35°
– 75
– 50
– 25
0
25
50
75
100
VCC ± = ± 15 V
ÁÁ
ÁÁ
GBW (f = 10 kHz)
55°
60
45°
55
40°
50
35°
45
– 25
0
Figure 20
50
75
100
40
125
Figure 21
EQUIVALENT INPUT NOISE VOLTAGE
vs
BANDWIDTH
TOTAL EQUIVALENT INPUT NOISE VOLTAGE
vs
SOURCE RESISTANCE
100
10
VCC ± = ± 15 V
BW = 1 Hz
TA = 25°C
Hz
VCC ± = ± 15 V
RS = 20 Ω
TA = 25°C
Total Equivalent Input Noise Voltage – nV/
Vn – Equivalent Input Noise Voltage – µV
25
TA – Free-Air Temperature – °C
TA – Free-Air Temperature – °C
1
0.1
0.01
0.1
65
50°
30°
– 50
7
125
85
φm
Gain-Bandwidth Product – MHz
80°
11
Φ – Phase Margin
φm
VCC ± = ± 15 V
Gain-Bandwidth Product – MHz
85°
1
10
Bandwidth – kHz
(0.1 Hz to frequency indicated)
100
R1
–
+
R2
RS = R1 + R2
10
f = 10 Hz
Resistor Noise Only
f = 1 kHz
1
100
1k
10 k
RS – Source Resistance – Ω
Figure 22
Figure 23
† Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
•
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•
2–13
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
TYPICAL CHARACTERISTICS†
OP27A, OP27E, OP37A, OP37E
EQUIVALENT INPUT NOISE VOLTAGE
vs
FREE-AIR TEMPERATURE
5
RS = 20 Ω
BW = 1 Hz
TA = 25°C
Vn – Equivalent Input Noise Voltage – nV/ Hz
Vn – Equivalent Input Noise Voltage – nV/ Hz
20
OP27A, OP27E, OP37A, OP37E
EQUIVALENT INPUT NOISE VOLTAGE
vs
TOTAL SUPPLY VOLTAGE
15
f = 10 Hz
f = 1 kHz
10
5
10
20
30
f = 10 Hz
4
3
f = 1 kHz
2
1
– 50
0
0
VCC ± = ± 15 V
RS = 20 Ω
BW = 1 Hz
40
– 25
0
25
50
75
100
125
TA – Free-Air Temperature – °C
VCC + – VCC – – Total Supply Voltage – V
Figure 24
Figure 25
OP27A, OP27E, OP37A, OP37E
EQUIVALENT INPUT NOISE CURRENT
vs
FREQUENCY
10
9
8
7
10
VCC ± = ± 15 V
RS = 20 Ω
BW = 1 Hz
TA = 25°C
6
I n – Equivalent Input Noise Current – pA/ Hz
Vn – Equivalent Input Noise Voltage – nV/ Hz
EQUIVALENT INPUT NOISE VOLTAGE
vs
FREQUENCY
5
4
3
1/f Corner = 2.7 Hz
2
1
VCC ± = ± 15 V
BW = 1 Hz
TA = 25°C
1
1/f Corner = 140 Hz
0.1
1
10
100
10
1000
100
1k
f – Frequency – Hz
f – Frequency – Hz
Figure 26
Figure 27
† Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
2–14
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•
10 k
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
TYPICAL CHARACTERISTICS†
SHORT-CIRCUIT OUTPUT CURRENT
vs
ELAPSED TIME
SUPPLY CURRENT
vs
TOTAL SUPPLY VOLTAGE
5
VCC ± = ± 15 V
TA = 25°C
50
IICC
CC – Supply Current – mA
IIOS
OS – Short-Circuit Output Current – mA
60
IOS –
40
ÁÁ
ÁÁ
ÁÁ
30
IOS +
ÁÁ
ÁÁ
20
10
4
TA = 125°C
3
TA = 25°C
2
TA = – 55°C
1
0
1
2
3
t – Time – minutes
4
5
5
15
Figure 28
35
OP27
OP27
VOLTAGE FOLLOWER
SMALL-SIGNAL
PULSE RESPONSE
VOLTAGE FOLLOWER
LARGE-SIGNAL
PULSE RESPONSE
80
8
60
6
40
4
20
0
– 20
VCC ± = ± 15 V
AV = 1
CL = 15 pF
TA = 25°C
– 40
– 60
45
Figure 29
VO – Output Voltage – V
VO – Output Voltage – mV
25
VCC + – VCC – – Total Supply Voltage – V
2
0
–2
–4
VCC ± = ± 15 V
AV = – 1
TA = 25°C
–6
– 80
–8
0
0.5
1
1.5
t – Time – µs
2
2.5
0
3
Figure 30
2
4
6
t – Time – µs
8
10
12
Figure 31
† Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
•
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•
2–15
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
OP37
OP37
VOLTAGE-FOLLOWER
SMALL-SIGNAL PULSE RESPONSE
VOLTAGE-FOLLOWER
LARGE-SIGNAL PULSE RESPONSE
80
8
60
6
40
4
VO – Output Voltage – V
VO – Output Voltage – mV
TYPICAL CHARACTERISTICS
20
0
– 20
VCC ± = ± 15 V
AV = 5
CL = 15 pF
TA = 25°C
– 40
– 60
2
0
–2
–4
VCC ± = ± 15 V
AV = 5
TA = 25°C
–6
– 80
–8
0
0.2
0.4
0.6
t – Time – µs
0.8
1
0
1.2
Figure 32
1
2
3
t – Time – µs
4
5
6
Figure 33
APPLICATION INFORMATION
general
The OP27 and OP37 series devices can be inserted directly onto OP07, OP05, µA725, and SE5534 sockets
with or without removing external compensation or nulling components. In addition, the OP27 and OP37 can
be fitted to µA741 sockets by removing or modifying external nulling components.
noise testing
Figure 34 shows a test circuit for 0.1-Hz to 10-Hz peak-to-peak noise measurement of the OP27 and OP37. The
frequency response of this noise tester indicates that the 0.1-Hz corner is defined by only one zero. Because
the time limit acts as an additional zero to eliminate noise contributions from the frequency band below 0.1 Hz,
the test time to measure 0.1-Hz to 10-Hz noise should not exceed 10 seconds.
Measuring the typical 80-nV peak-to-peak noise performance of the OP27 and OP37 requires the following
special test precautions:
1. The device should be warmed up for at least five minutes. As the operational amplifier warms up, the
offset voltage typically changes 4 µV due to the chip temperature increasing from 10°C to 20°C starting
from the moment the power supplies are turned on. In the 10-s measurement interval, these
temperature-induced effects can easily exceed tens of nanovolts.
2. For similar reasons, the device should be well shielded from air currents to eliminate the possibility of
thermoelectric effects in excess of a few nanovolts, which would invalidate the measurements.
3. Sudden motion in the vicinity of the device should be avoided, as it produces a feedthrough effect that
increases observed noise.
2–16
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•
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
APPLICATION INFORMATION
AVD – Differential Voltage Amplification – dB
100
90
80
70
60
50
40
30
0.01
0.1
1
10
f – Frequency – Hz
100
0.1 µF
100 kΩ
10 Ω
–
LT1001
2 kΩ
OP27/OP37
Device
Under
Test
Voltage
Gain = 50,000
4.7 µF
4.3 kΩ
+
–
+
100 kΩ
2.2 µF
24.3 kΩ
0.1 µF
22 µF
Oscilloscope
Rin = 1 MΩ
110 kΩ
NOTE: All capacitor values are for nonpolarized capacitors only.
Figure 34. 0.1-Hz to 10-Hz Peak-to-Peak Noise Test Circuit and Frequency Response
•
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•
2–17
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
APPLICATION INFORMATION
When measuring noise on a large number of units, a noise-voltage density test is recommended. A 10-Hz
noise-voltage density measurement correlates well with a 0.1-Hz to 10-Hz peak-to-peak noise reading since
both results are determined by the white noise and the location of the 1/f corner frequency.
Figure 35 shows a circuit measuring current noise and the formula for calculating current noise.
10kΩ
100 Ω
500 kΩ
–
500 kΩ
Vno
+
In =
[Vno2 – (130 nV)2]1/2
1 MΩ × 100
Figure 35. Current Noise Test Circuit and Formula
offset voltage adjustment
The input offset voltage and temperature coefficient of the OP27 and OP37 are permanently trimmed to a low
level at wafer testing. However, if further adjustment of VIO is necessary, using a 10-kΩ nulling potentiometer
as shown in Figure 36 does not degrade the temperature coefficient αVIO. Trimming to a value other than zero
creates an αVIO of VIO/300 µV/°C. For example, if VIO is adjusted to 300 µV, the change in αVIO is 1 µV/°C.
The adjustment range with a 10-kΩ potentiometer is approximately ± 2.5 mV. If a smaller adjustment range is
needed, the sensitivity and resolution of the nulling can be improved by using a smaller potentiometer in
conjunction with fixed resistors. The example in Figure 37 has an approximate null range of ± 200 µV.
4.7 kΩ
10 kΩ
1 kΩ
15 V
1
2
–
Input
3
+
15 V
8
4.7 kΩ
7 6
Output
2
4
Input
–15 V
1
8
7 6
3
Output
4
Figure 36. Standard Input Offset
Voltage Adjustment
–15 V
Figure 37. Input Offset Voltage Adjustment With
Improved Sensitivity
offset voltage and drift
Unless proper care is exercised, thermoelectric effects caused by temperature gradients across dissimilar
metals at the contacts to the input terminals can exceed the inherent temperature coefficient ∝VIO of the
amplifier. Air currents should be minimized, package leads should be short, and the two input leads should be
close together and at the same temperature.
2–18
•
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•
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
APPLICATION INFORMATION
offset voltage and drift (continued)
The circuit shown in Figure 38 measures offset voltage. This circuit can also be used as the burn-in configuration
for the OP27 and OP37 with the supply voltage increased to 20 V, R1 = R3 = 10 kΩ, R2 = 200 Ω, and
AVD = 100.
R1
50 kΩ
15 V
2
R2
100 Ω
3
R3
50 kΩ
7
–
+
6
VO = 1000 VIO
4
–15 V
NOTE A: Resistors must have low thermoelectric potential.
Figure 38. Test Circuit for Offset Voltage and Offset Voltage
Temperature Coefficient
unity gain buffer applications
The resulting output waveform, when Rf ≤ 100 Ω and the input is driven with a fast large-signal pulse (> 1 V),
is shown in the pulsed-operation diagram in Figure 39.
Rf
2.8 V/µs
–
Output
+
OP27
Figure 39. Pulsed Operation
During the initial (fast-feedthrough-like) portion of the output waveform, the input protection diodes effectively
short the output to the input, and a current, limited only by the output short-circuit protection, is drawn by the
signal generator. When Rf ≥ 500 Ω, the output is capable of handling the current requirements (load
current ≤ 20 mA at 10 V), the amplifier stays in its active mode, and a smooth transition occurs. When
Rf > 2 kΩ, a pole is created with Rf and the amplifier’s input capacitance, creating additional phase shift and
reducing the phase margin. A small capacitor (20 pF to 50 pF) in parallel with Rf eliminates this problem.
•
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•
2–19
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
APPLICATION INFORMATION
120
Noise Voltage – nV
100
80
60
40
20
0
0
2
4
6
8
10
t – Time – seconds
Type S Thermocouples
5.4 µV/°C at 0°C
+
#1
–
Cold-Junction
Circuitry
To Gate
Drive
+
+
–
AVD = 10,000
+
OP27
–
#2
–
Typical
Multiplexing
FET Switches
+
0.05 µF
#24
High-Quality
Single-Point Ground
–
Output
100 kΩ
10 Ω
NOTE A: If 24 channels are multiplexed per second and the output is required to settle to 0.1 % accuracy, the amplifier’s bandwidth cannot be
limited to less than 30 Hz. The peak-to-peak noise contribution of the OP27 will still be only 0.11 µV, which is equivalent to an error
of only 0.02°C.
Figure 40. Low-Noise, Multiplexed Thermocouple Amplifier and 0.1-Hz To 10-Hz
Peak-to-Peak Noise Voltage
2–20
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•
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