OPA703
OPA2703
OPA4703
OPA
703
OPA704
OPA
703
O PA
OPA
703
OPA2704
OPA4704
7 03
®
SBOS180A – MARCH 2001
CMOS, Rail-to-Rail, I/O
OPERATIONAL AMPLIFIERS
FEATURES
DESCRIPTION
● RAIL-TO-RAIL INPUT AND OUTPUT
● WIDE SUPPLY RANGE:
Single Supply: 4V to 12V
Dual Supplies: ±2 to ±6
● LOW QUIESCENT CURRENT: 160µA
● FULL-SCALE CMRR: 90dB
● LOW OFFSET: 160µV
● HIGH SPEED:
OPA703: 1MHz, 0.6V/ µs
OPA704: 3MHz, 3V/ µs
● MicroSIZE PACKAGES:
SOT23-5, MSOP-8, TSSOP-14
● LOW INPUT BIAS CURRENT: 1pA
The OPA703 and OPA704 series op amps are optimized for
applications requiring rail-to-rail input and output swing.
Single, dual, and quad versions are offered in a variety of
packages. While the quiescent current is less than 200µA per
amplifier, the OPA703 still offers excellent dynamic performance (1MHz GBW and 0.6V/µs SR) and unity-gain stability. The OPA704 is optimized for gains of 5 or greater and
provides 3MHz GBW and 3V/µs slew rate.
The OPA703 and OPA704 series are fully specified and
guaranteed over the supply range of ±2V to ±6V. Input
swing extends 300mV beyond the rail and the output swings
to within 40mV of the rail.
The single versions (OPA703 and OPA704) are available in
the MicroSIZE SOT23-5 and in the standard SO-8 surfacemount, as well as the DIP-8 packages. Dual versions
(OPA2703 and OPA2704) are available in the MSOP-8,
SO-8, and DIP-8 packages. The quad OPA4703 and
OPA4704 are available in the TSSOP-14 and SO-14 packages. All are specified for operation from –40°C to +85°C.
APPLICATIONS
● AUTOMOTIVE APPLICATIONS:
Audio, Sensor Applications, Security Systems
● PORTABLE EQUIPMENT
● ACTIVE FILTERS
● TRANSDUCER AMPLIFIER
● TEST EQUIPMENT
NC
● DATA ACQUISITION
OPA703
OPA704
Out
1
V–
2
+In
3
5
4
SOT23-5
V+
–In
OPA703
OPA704
1
8
NC
–In
2
7
V+
+In
3
6
Out
V–
4
5
NC
OPA2703
OPA2704
Out A
1
–In A
2
+In A
3
V–
4
A
B
SO-8, DIP-8
8
V+
7
Out B
6
–In B
5
+In B
OPA4703
OPA4704
Out A
1
–In A
2
A
14
Out D
13
–In D
D
+In A
3
12
+In D
V+
4
11
V–
+In B
5
10
+In C
B
C
–In B
6
9
–In C
Out B
7
8
Out C
TSSOP-14, SO-14
MSOP-8, SO-8, DIP-8
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright © 2001, 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.
www.ti.com
ABSOLUTE MAXIMUM RATINGS(1)
ELECTROSTATIC
DISCHARGE SENSITIVITY
Supply Voltage, V+ to V– ................................................................. 13.2V
Signal Input Terminals, Voltage(2) ..................... (V–) –0.3V to (V+) +0.3V
Current(2) .................................................... 10mA
Output Short-Circuit(3) .............................................................. Continuous
Operating Temperature .................................................. –55°C to +125°C
Storage Temperature ..................................................... –65°C to +150°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
NOTES: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may
degrade device reliability. (2) Input terminals are diode-clamped to the power
supply rails. Input signals that can swing more than 0.3V beyond the supply
rails should be current-limited to 10mA or less. (3) Short-circuit to ground,
one amplifier per package.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.
PACKAGE/ORDERING INFORMATION
PRODUCT
DESCRIPTION
MINIMUM
RECOMMENDED
GAIN
OPA703NA
Single, GBW = 1MHz
1
SOT23-5
331
A03
"
"
"
"
"
Single, GBW = 1MHz
1
SO-8
182
OPA703UA
"
"
"
"
"
OPA703PA
Single, GBW = 1MHz
1
DIP-8
006
OPA703PA
OPA2703EA
Dual, GBW = 1MHz
1
MSOP-8
337
B03
"
"
"
"
"
"
OPA2703UA
Dual, GBW = 1MHz
1
SO-8
182
OPA2703UA
"
"
"
"
"
"
OPA2703PA
Dual, GBW = 1MHz
1
DIP-8
006
OPA2703PA
OPA4703EA
Quad, GBW = 1MHz
1
TSSOP-14
357
OPA4703EA
"
"
"
"
"
"
OPA4703UA
Quad, GBW = 1MHz
1
SO-14
235
OPA4703UA
"
"
"
"
"
"
Single, GBW = 5MHz
5
SOT23-5
331
A04
"
"
"
"
"
Single, GBW = 5MHz
5
SO-8
182
OPA704UA
"
"
"
"
"
OPA704PA
Single, GBW = 5MHz
5
DIP-8
006
OPA704PA
OPA2704EA
Dual, GBW = 5MHz
5
MSOP-8
337
B04
"
"
"
"
"
"
OPA2704UA
Dual, GBW = 5MHz
5
SO-8
182
OPA2704UA
"
"
"
"
"
"
OPA2704PA
Dual, GBW = 5MHz
5
DIP-8
006
OPA2704PA
OPA4704EA
Quad, GBW = 5MHz
5
TSSOP-14
357
OPA4704EA
"
"
"
"
"
"
OPA4704UA
Quad, GBW = 5MHz
5
SO-14
235
OPA4704UA
"
"
"
"
"
"
"
OPA703UA
"
OPA704NA
"
OPA704UA
"
PACKAGE
PACKAGE
DRAWING
NUMBER
PACKAGE
MARKING
ORDERING
NUMBER(1)
TRANSPORT
MEDIA
OPA703NA/250
OPA703NA/3K
OPA703UA
OPA703UA/2K5
OPA703PA
Tape and Reel
Tape and Reel
Rails
Tape and Reel
Rails
OPA2703EA/250
OPA2703EA/2K5
OPA2703UA
OPA2703UA/2K5
OPA2703PA
Tape and Reel
Tape and Reel
Rails
Tape and Reel
Rails
OPA4703EA/250
OPA4703EA/2K5
OPA4703UA
OPA4703UA/2K5
Tape and Reel
Tape and Reel
Rails
Tape and Reel
OPA704NA/250
OPA704NA/3K
OPA704UA
OPA704UA/2K5
OPA704PA
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Rails
OPA2703EA/250
OPA2703EA/2K5
OPA2704UA
OPA2704UA/2K5
OPA2704PA
Tape and Reel
Tape and Reel
Rails
Tape and Reel
Rails
OPA4704EA/250
OPA4704EA/2K5
OPA4704UA
OPA4704UA/2K5
Tape and Reel
Tape and Reel
Rails
Tape and Reel
NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /3K indicates 3000 devices per reel). Ordering 3000 pieces
of “OPA703NA/3K” will get a single 3000-piece Tape and Reel.
2
OPA703, OPA704
SBOS180A
OPA703 ELECTRICAL CHARACTERISTICS: VS = 4V to 12V
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C
At TA = +25°C, RL = 20kΩ connected to VS / 2 and VOUT = VS / 2, unless otherwise noted.
OPA703NA, UA, PA
OPA2703EA, UA, PA
OPA4703EA, UA
PARAMETER
OFFSET VOLTAGE
Input Offset Voltage
Drift
vs Power Supply
Over Temperature
Channel Separation, dc
f = 1kHz
CONDITION
VOS
dVOS / dT
PSRR
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection Ratio
over Temperature
VCM
CMRR
over Temperature
INPUT BIAS CURRENT
Input Bias Current
Input Offset Current
IB
IOS
MIN
VS = ±5V, VCM = 0V
TA = –40°C to +85°C
VS = ±2V to ±6V, VCM = 0V
VS = ±2V to ±6V, VCM = 0V
RL = 20kΩ
VS = ±5V, (V–) – 0.3V < VCM < (V+) + 0.3V
VS = ±5V, (V–) < VCM < (V+)
VS = ±5V, (V–) – 0.3V < VCM < (V+) – 2V
VS = ±5V, (V–) < VCM < (V+) – 2V
OPEN-LOOP GAIN
Open-Loop Voltage Gain
en
in
AOL
(V–) – 0.3
70
68
80
74
VS = ±5V, VCM = 0V
VS = ±5V, VCM = 0V
over Temperature
over Temperature
OUTPUT
Voltage Output Swing from Rail
over Temperature
over Temperature
Output Current
Short-Circuit Current
Capacitive Load Drive
FREQUENCY RESPONSE
Gain-Bandwidth Product
Slew Rate
Settling Time, 0.1%
0.01%
Overload Recovery Time
Total Harmonic Distortion + Noise
POWER SUPPLY
Specified Voltage Range, Single Supply
Specified Voltage Range, Dual Supplies
Operating Voltage Range
Quiescent Current (per amplifier)
over Temperature
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
Thermal Resistance
SOT23-5 Surface-Mount
MSOP-8 Surface-Mount
TSSOP-14 Surface-Mount
SO-8 Surface Mount
SO-14 Surface Mount
DIP-8
OPA703, OPA704
SBOS180A
IOUT
ISC
RL = 100kΩ, AOL > 80dB
RL = 20kΩ, AOL > 100dB
RL = 20kΩ, AOL > 96dB
RL = 5kΩ, AOL > 100dB
RL = 5kΩ, AOL > 96dB
|VS – VOUT| < 1V
CLOAD
GBW
SR
tS
THD+N
IQ
100
96
100
96
±750
µV
µV/°C
µV/V
µV/V
µV/V
dB
(V+) + 0.3
V
dB
dB
dB
dB
±10
±10
pA
pA
90
96
4 • 109 || 4
5 • 1012 || 4
Ω || pF
Ω || pF
6
45
2.5
µVp-p
nV/√Hz
fA/√Hz
120
110
dB
dB
dB
dB
dB
110
75
75
150
150
±10
±40
See Typical Performance Curves
1
0.6
15
20
3
0.02
4
±2
–40
–55
–65
θJA
200
150
100
150
100
100
mV
mV
mV
mV
mV
mA
mA
MHz
V/µs
µs
µs
µs
%
12
±6
3.6 to 12
160
IO = 0
UNITS
100
200
40
CL = 100pF
G = +1
VS = ±5V, G = +1
VS = ±5V, 5V Step, G = +1
VS = ±5V, 5V Step, G = +1
VIN • Gain = VS
VS = ±5V, VO = 3Vp-p, G = +1, f = 1kHz
VS
VS
±160
±4
20
±1
±0.5
VS = ±5V, VCM = 0V
VS = ±5V, VCM = 0V
VS = ±5V, VCM = 0V
RL = 100kΩ, (V–)+0.1V < VO < (V+)–0.1V
RL = 20kΩ, (V–)+0.075V < VO < (V+)–0.075V
RL = 20kΩ, (V–)+0.075V < VO < (V+)–0.075V
RL = 5kΩ, (V–)+0.15V < VO < (V+)–0.15V
RL = 5kΩ, (V–)+0.15V < VO < (V+)–0.15V
MAX
1
98
INPUT IMPEDANCE
Differential
Common-Mode
NOISE
Input Voltage Noise, f = 0.1Hz to 10Hz
Input Voltage Noise Density, f = 1kHz
Current Noise Density, f = 1kHz
TYP
200
300
V
V
V
µA
µA
85
125
150
°C
°C
°C
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
3
OPA704 ELECTRICAL CHARACTERISTICS: VS = 4V to 12V
Boldface limits apply over the specified temperature range, TA = –40°C to +85°C
At TA = +25°C, RL = 20kΩ connected to VS / 2 and VOUT = VS / 2, unless otherwise noted.
OPA704NA, UA, PA
OPA2704EA, UA, PA
OPA4704EA, UA
PARAMETER
OFFSET VOLTAGE
Input Offset Voltage
Drift
vs Power Supply
Over Temperature
Channel Separation, dc
f = 1kHz
CONDITION
VOS
dVOS/dT
PSRR
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection Ratio
over Temperature
VCM
CMRR
over Temperature
INPUT BIAS CURRENT
Input Bias Current
Input Offset Current
IB
IOS
MIN
VS = ±5V, VCM = 0V
TA = –40°C to +85°C
VS = ±2V to ±6V, VCM = 0V
VS = ±2V to ±6V, VCM = 0V
RL = 20kΩ
VS = ±5V, (V–) – 0.3V < VCM < (V+) + 0.3V
VS = ±5V, (V–) < VCM < (V+)
VS = ±5V, (V–) – 0.3V < VCM < (V+) – 2V
VS = ±5V, (V–) < VCM < (V+) – 2V
OPEN-LOOP GAIN
Open-Loop Voltage Gain
en
in
AOL
(V–) – 0.3
70
68
80
74
VS = ±5V, VCM = 0V
VS = ±5V, VCM = 0V
over Temperature
over Temperature
OUTPUT
Voltage Output Swing from Rail
over Temperature
over Temperature
Output Current
Short-Circuit Current
Capacitive Load Drive
FREQUENCY RESPONSE
Gain-Bandwidth Product
Slew Rate
Settling Time, 0.1%
0.01%
Overload Recovery Time
Total Harmonic Distortion + Noise
POWER SUPPLY
Specified Voltage Range, Single Supply
Specified Voltage Range, Dual Supplies
Operating Voltage Range
Quiescent Current (per amplifier)
over Temperature
TEMPERATURE RANGE
Specified Range
Operating Range
Storage Range
Thermal Resistance
SOT23-5 Surface-Mount
MSOP-8 Surface-Mount
TSSOP-14 Surface-Mount
SO-8 Surface Mount
SO-14 Surface Mount
DIP-8
4
IOUT
ISC
RL = 100kΩ, AOL > 80dB
RL = 20kΩ, AOL > 100dB
RL = 20kΩ, AOL > 96dB
RL = 5kΩ, AOL > 100dB
RL = 5kΩ, AOL > 96dB
|VS – VOUT| < 1V
CLOAD
GBW
SR
tS
THD+N
IQ
100
96
100
96
±750
µV
µV/°C
µV/V
µV/V
µV/V
dB
(V+) + 0.3
V
dB
dB
dB
dB
±10
±10
pA
pA
90
96
4 • 109 || 4
5 • 1012 || 4
Ω || pF
Ω || pF
6
45
2.5
µVp-p
nV/√Hz
fA/√Hz
120
110
dB
dB
dB
dB
dB
110
75
75
150
150
±10
±40
See Typical Performance Curves
3
3
18
21
0.6
0.025
4
±2
–40
–55
–65
θJA
200
150
100
150
100
100
mV
mV
mV
mV
mV
mA
mA
MHz
V/µs
µs
µs
µs
%
12
±6
3.6 to 12
160
IO = 0
UNITS
100
200
40
CL = 100pF
G = +5
VS = ±5V, G = +5
VS = ±5V, 5V Step, G = +5
VS = ±5V, 5V Step, G = +5
VIN • Gain = VS
VS = ±5V, VO = 3Vp-p, G = +5, f = 1kHz
VS
VS
±160
±4
20
±1
±0.5
VS = ±5V, VCM = 0V
VS = ±5V, VCM = 0V
VS = ±5V, VCM = 0V
RL = 100kΩ, (V–)+0.1V < VO < (V+)–0.1V
RL = 20kΩ, (V–)+0.075V < VO < (V+)–0.075V
RL = 20kΩ, (V–)+0.075V < VO < (V+)–0.075V
RL = 5kΩ, (V–)+0.15V < VO < (V+)–0.15V
RL = 5kΩ, (V–)+0.15V < VO < (V+)–0.15V
MAX
1
98
INPUT IMPEDANCE
Differential
Common-Mode
NOISE
Input Voltage Noise, f = 0.1Hz to 10Hz
Input Voltage Noise Density, f = 1kHz
Current Noise Density, f = 1kHz
TYP
200
300
V
V
V
µA
µA
85
125
150
°C
°C
°C
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
OPA703, OPA704
SBOS180A
TYPICAL CHARACTERISTICS
At TA = +25°C, VS = ±5V, and RL = 20kΩ, unless otherwise noted.
100
100
100
80
80
80
80
60
60
60
60
40
40
40
40
20
20
0
0
20
20
0
0
Gain (dB)
120
100
Phase (°)
120
Gain (dB)
120
–20
–20
–40
–40
–20
–60
10M
–40
–60
100
10
1k
10k
100k
1M
–20
10
100
1k
10k
100k
1M
–40
10M
Frequency (Hz)
Frequency (Hz)
CMRR vs FREQUENCY
PSRR vs FREQUENCY
120
140
CMRR Limited Range
120
100
100
PSRR (dB)
CMRR (dB)
80
CMRR Full Scale
60
40
80
60
40
20
20
0
0
1
10
100
1k
10k
100k
1M
1
10
Frequency (Hz)
100
1k
10k
100k
1M
Frequency (Hz)
MAXIMUM AMPLITUDE vs FREQUENCY
CHANNEL SEPARATION vs FREQUENCY
7
160
(V+) – (V–) = 12V
140
Channel Separation (dB)
6
Amplitude (V)
5
OPA704
4
3
2
OPA703
1
120
100
80
60
40
20
0
0
100
1k
10k
100k
Frequency (Hz)
OPA703, OPA704
SBOS180A
1M
10M
10
100
1k
10k
100k
1M
Frequency (Hz)
5
Phase (°)
OPA704 GAIN AND PHASE vs FREQUENCY
OPA703 GAIN AND PHASE vs FREQUENCY
120
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = ±5V, and RL = 20kΩ, unless otherwise noted.
INPUT CURRENT AND VOLTAGE
SPECTRAL NOISE vs FREQUENCY
COMMON-MODE REJECTION RATIO
vs TEMPERATURE
10000
1000
Voltage
Noise
100
100
10
10
1
1
0.1
110
Limited Scale
CMRR (dB)
Current
Noise
1000
120
Output Current Spectral
Noise fA/√Hz
Input Current and Voltage
Spectral Noise nV/√Hz
10000
1
10
100
1k
10k
100k
90
80
Full Scale
70
0.1
0.1
100
60
1M
–80 –60 –40 –20
0
Frequency (Hz)
20
40
60
80
100 120 140
Temperature (°C)
INPUT BIAS (IB) AND OFFSET (IOS)
CURRENT vs TEMPERATURE
OPEN-LOOP GAIN vs TEMPERATURE
100000
140
10000
Bias Current (pA)
AOL (dB)
130
120
110
1000
IB
100
IOS
10
1
100
0.1
90
–100 –75 –50 –25
0.0
0
25
50
–50
75 100 125 150 175
–25
0
25
50
75
100
125
150
175
Temperature (°C)
Temperature (°C)
PSRR vs TEMPERATURE
QUIESCENT CURRENT vs TEMPERATURE
250
120
200
110
PSRR (dB)
IQ (µA)
100
150
100
90
80
50
0
–100 –75 –50 –25
70
60
0
25
50
75
Temperature (°C)
6
100 125 150 175
–75 –50 –25
0
10
25
50
75 100 110 130 150
Temperature (°C)
OPA703, OPA704
SBOS180A
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = ±5V, and RL = 20kΩ, unless otherwise noted.
INPUT BIAS CURRENT (IB)
vs COMMON-MODE VOLTAGE (VCM)
TEMPERATURE = °25C
TOTAL HARMONIC DISTORTION PLUS NOISE
(Load = 5kΩ, BW = 8kHz, 1.0Vrms)
15
1.000
Input Bias Current (pA)
10
G = +5
OPA704
THD (%)
0.100
0.010
OPA703
G = +1
5
0
–5
–10
–15
0.001
10
1
100
1k
10k
–6
100k
–5 –4
INPUT BIAS CURRENT (IB)
vs COMMON-MODE VOLTAGE (VCM)
TEMPERATURE = 125°C
–2
0
1
2
3
4
5
6
QUIESCENT CURRENT vs SUPPLY VOLTAGE
190
Quiescent Current (µA)
10
5
0
–5
–10
180
170
160
150
140
130
120
–15
–6
–5 –4
–3
–2
–1
0
1
2
3
4
5
2
6
4
6
8
10
12
14
Supply Voltage (V)
Common-Mode Voltage, VCM (V)
SHORT-CIRCUIT CURRENT
vs SUPPLY VOLTAGE
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
6
60
ISC N (Sinking)
+125°C
4
50
Output Voltage (V)
Short-Circuit Current (mA)
–1
200
15
Input Bias Current (nA)
–3
Common-Mode Voltage, VCM (V)
Frequency (Hz)
40
30
ISC P (Sourcing)
20
+25°C
Sourcing
–55°C
Sinking
–55°C
2
0
–2
10
–4
0
–6
+125°C +25°C
2
4
6
8
10
Supply Voltage (V)
OPA703, OPA704
SBOS180A
12
14
0
10
20
30
40
50
60
70
Output Current (±mA)
7
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = ±5V, and RL = 20kΩ, unless otherwise noted.
OPA704 SMALL-SIGNAL OVERSHOOT (%)
vs CAPACITIVE LOAD
OPA703 SMALL-SIGNAL OVERSHOOT (%)
vs CAPACITIVE LOAD AND GAIN
90
90
G = +1
80
70
70
60
60
50
Overshoot (%)
Overshoot (%)
80
G = –1
40
30
20
50
G = +5
40
30
20
G = +5
10
10
0
0
10
100
1k
10
10k
Load Capacitance Value (pF)
50
90
45
40
70
Settling Time (µs)
0.01%
60
50
40
35
0.01%
30
25
20
30
0.1%
20
0.10%
15
10
10
1
10
100
1
Non-Inverting Gain (V/V)
VOS PRODUCTION DISTRIBUTION
20
20
Frequency (%)
25
15
10
15
10
< 0.75
< 0.60
< 0.45
< 0.30
< 0.15
< 0.00
0
≤ 0.15
0
≤ 0.30
5
≤ 0.45
5
≤ 0.60
100
VOS DRIFT PRODUCTION DISTRIBUTION
25
Voltage Offset (µV)
10
Non-Inverting Gain (V/V)
≤ 30
≤ 27
≤ 24
≤ 21
≤ 18
≤ 15
≤ 12
≤9
≤6
≤3
<0
<3
<6
<9
< 12
< 15
< 18
< 21
< 24
< 27
< 30
> 30
Settling Time (µs)
10k
OPA704 SETTLING TIME vs GAIN
100
80
Frequency (%)
1k
Capacitance Load (pF)
OPA703 SETTLING TIME vs GAIN
8
100
Voltage Offset (µV/°C)
OPA703, OPA704
SBOS180A
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, VS = ±5V, and RL = 20kΩ, unless otherwise noted.
OPA704 SMALL SIGNAL STEP RESPONSE
(G = +5V/V, CF = 3pF, RF = 100kΩ,
CL = 100pF, RL = 20kΩ,)
50mV/div
50mV/div
OPA703 SMALL SIGNAL STEP RESPONSE
(G = +1V/V, RL = 20kΩ, CL = 100pF)
OPA703 LARGE SIGNAL STEP RESPONSE
(G = +1V/V, RL = 20kΩ, CL = 100pF)
OPA704 LARGE SIGNAL STEP RESPONSE
(G = +5V/V, RL = 20kΩ, CF = 3pF, CL = 100pF)
1V/div
5µs/div
1V/div
5µs/div
10µs/div
OPA703, OPA704
SBOS180A
2µs/div
9
APPLICATIONS INFORMATION
Power-supply pins should be bypassed with 1000pF ceramic
capacitors in parallel with 1µF tantalum capacitors.
OPA703 and OPA704 series op amps can operate on 160µA
quiescent current from a single (or split) supply in the range
of 4V to 12V (±2V to ±6V), making them highly versatile
and easy to use. The OPA703 is unity-gain stable and offers
1MHz bandwidth and 0.6V/µs slew rate. The OPA704 is
optimized for gains of 5 or greater with a 3MHz bandwidth
and 3V/µs slew rate.
OPERATING VOLTAGE
OPA703 and OPA704 series op amps are fully specified and
guaranteed from +4V to +12V over a temperature range of
–40ºC to +85ºC. Parameters that vary significantly with
operating voltages or temperature are shown in the Typical
Performance Curves.
Rail-to-rail input and output swing helps maintain dynamic
range, especially in low supply applications. Figure 1 shows
the input and output waveforms for the OPA703 in unitygain configuration. Operation is from a ±5V supply with a
100kΩ load connected to VS /2. The input is a 10Vp-p
sinusoid. Output voltage is approximately 10Vp-p.
RAIL-TO-RAIL INPUT
The input common-mode voltage range of the OPA703 series
extends 300mV beyond the supply rails at room temperature.
This is achieved with a complementary input stage—an Nchannel input differential pair in parallel with a P-channel
differential pair, as shown in Figure 2. The N-channel pair is
active for input voltages close to the positive rail, typically
(V+) – 2.0V to 300mV above the positive supply, while the Pchannel pair is on for inputs from 300mV below the negative
supply to approximately (V+) – 1.5V. There is a small
transition region, typically (V+) – 2.0V to (V+) – 1.5V, in
which both pairs are on. This 500mV transition region can
vary ±100mV with process variation. Thus, the transition
region (both stages on) can range from (V+) – 2.1V to (V+)
– 1.4V on the low end, up to (V+) – 1.9V to (V+) – 1.6V on
the high end. Within the 500mV transition region PSRR,
CMRR, offset voltage, and offset drift, and THD may vary
compared to operation outside this region.
G = +1, VS = ±5V
2.0V/div
Input
Output (inverted on scope)
200µs/div
FIGURE 1. Rail-to-Rail Input and Output.
V+
VO
VIN+
VIN–
V–
FIGURE 2. Simplified Schematic.
10
OPA703, OPA704
SBOS180A
INPUT VOLTAGE
Device inputs are protected by ESD diodes that will conduct
if the input voltages exceed the power supplies by more than
approximately 300mV. Momentary voltages greater than
300mV beyond the power supply can be tolerated if the
current is limited to 10mA. This is easily accomplished with
an input resistor, as shown in Figure 3. Many input signals
are inherently current-limited to less than 10mA; therefore,
a limiting resistor is not always required. The OPA703
features no phase inversion when the inputs extend beyond
supplies if the input current is limited, as seen in Figure 4.
CAPACITIVE LOAD AND STABILITY
The OPA703 and OPA704 series op amps can drive up to
1000pF pure capacitive load. Increasing the gain enhances
the amplifier’s ability to drive greater capacitive loads (see
the typical performance curve “Small Signal Overshoot vs
Capacitive Load”).
One method of improving capacitive load drive in the unitygain configuration is to insert a 10Ω to 20Ω resistor inside
the feedback loop, as shown in Figure 5. This reduces
ringing with large capacitive loads while maintaining DC
accuracy.
+V
IOVERLOAD
10mA max
RS
20Ω
OPA703
VOUT
OPA703
VOUT
VIN
CL
VIN
RL
R
V–
FIGURE 3. Input Current Protection for Voltages Exceeding
the Supply Voltage.
2.0V/div
VS = ±5.0V, VIN = 11Vp-p
20µs/div
FIGURE 4. OPA703—No Phase Inversion with Inputs
Greater than the Power-Supply Voltage.
RAIL-TO-RAIL OUTPUT
A class AB output stage with common-source transistors is
used to achieve rail-to-rail output. This output stage is
capable of driving 1kΩ loads connected to any point between V+ and ground. For light resistive loads (> 100kΩ),
the output voltage can swing to 40mV from the supply rail.
With moderate resistive loads (20kΩ), the output can swing
to within 75mV from the supply rails while maintaining high
open-loop gain (see the typical performance curve “Output
Voltage Swing vs Output Current”).
OPA703, OPA704
SBOS180A
FIGURE 5. Series Resistor in Unity-Gain Buffer Configuration Improves Capacitive Load Drive.
APPLICATION CIRCUITS
Figure 6 shows a G = 5 non-inverting amplifier implemented
with the OPA703 and OPA704 op amps. It demonstrates the
increased speed characteristics (bandwidth, slew rate and
settling time) that can be achieved with the OPA704 family
when used in gains of five or greater. Some optimization of
feedback capacitor value may be required to achieve best
dynamic response. Circuits with closed-loop gains of less
than five should use the OPA703 family for good stability
and capacitive load drive. The OPA703 can be used in gains
greater than five, but will not provide the increased speed
benefits of the OPA704 family.
The OPA703 series op amps are optimized for driving
medium-speed sampling data converters. The OPA703 op
amps buffer the converter’s input capacitance and resulting
charge injection while providing signal gain.
Figure 7 shows the OPA2703 in a dual-supply buffered
reference configuration for the DAC7644. The DAC7644 is
a 16-bit, low-power, quad-voltage output converter. Small
size makes the combination ideal for automatic test equipment, data acquisition systems, and other low-power spacelimited applications.
11
3pF
5kΩ
20kΩ
5kΩ
OPA703
20kΩ
OPA704
G=5
VIN
G=5
VIN
LARGE-SIGNAL RESPONSE
Demonstrates speed improvement that
can be achieved with OPA704 family
in applications with G ≥ 5.
2V/div
OPA703
OPA704
5µs/div
FIGURE 6. OPA704 Provides higher Speed in G ≥ 5.
DAC7644
NC
48
NC
47
NC
46
NC
45
VOUTA Sense
44
VOUTA
43
VREFL AB Sense
42
VREFL AB
41
VREFH AB
40
VREFH AB Sense
39
VOUTB Sense
38
VOUTB
37
+V
V–
VOUT
–2.5V
1/2
OPA2703
Ref
Negative
Reference
500pF
V+
500pF
1/2
OPA2703
VOUT
+2.5V
Ref
Positive
Reference
–V
FIGURE 7. OPA703 as Dual Supply Configuration-Buffered References for the DAC7644.
12
OPA703, OPA704
SBOS180A
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