LT1492/LT1493
5MHz, 3V/µs, Low Power
Single Supply, Dual and Quad
Precision Op Amps
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FEATURES
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DESCRIPTION
Gain-Bandwidth Product: 5MHz Typ
Slew Rate: 3V/µs Typ
Low Supply Current per Amplifier: 0.55mA Max
Input Offset Voltage: 180µV Max
Input Offset Voltage Drift: 3µV/°C Max
Input Offset Current: 20nA Max
Input Bias Current: 100nA Max
Open-Loop Gain: 1500V/mV Min (VS = ±15V)
Low Input Noise Voltage: 16.5nV/√Hz
Low Input Noise Current: 0.14pA/√Hz
Large Output Drive Current: 20mA Min
Single Supply Operation
Input Voltage Range Includes Ground
Output Swings to Ground While Sinking Current
Wide Supply Voltage Range: 2.5V to 36V
Specified on 3.3V, 5V and ±15V
Dual in 8-Pin PDIP and SO Package
Quad in a Narrow 16-Pin SO Package
The LT ®1492/LT1493 are dual/quad, low power, single supply precision op amps with 5MHz gain-bandwidth product,
3V/µs slew rate and only 450µA of quiescent supply current
per amplifier.
With a maximum input offset voltage of only 180µV, the
LT1492/LT1493 eliminate trims in most systems while providing high frequency performance not usually found in low
power single supply amplifiers.
The LT1492/LT1493 will operate on any supply greater than
2.5V and less than 36V total, and are specified on single 3.3V,
single 5V and ±15V supplies. Even with their low quiescent
supply current the minimum output drive is 20mA, ideal for
driving low impedance loads.
The inputs can be driven beyond the supplies without
damage or phase reversal of the output. The low operating
voltage and wide input and output range make the LT1492/
LT1493 amplifiers ideal for battery-powered applications.
For applications requiring faster precision single supply
amplifiers, see the 14MHz, 7V/µs LT1211/LT1212, the
28MHz, 12V/µs LT1213/LT1214 or the 23MHz, 50V/µs
LT1215/LT1216.
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APPLICATIONS
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Battery-Powered Systems
Portable Instrumentation
Active Filters
Photodiode Amplifiers
DAC Current to Voltage Amplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation.
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Distribution of Offset Voltage
Drift with Temperature
TYPICAL APPLICATION
50
Precision AC to DC Converter (Full Wave Rectifier and Filter)
4.99k
+
5V
10k
VIN
–
1/2 LT1492
15k
–
+
VOUT DC
10µF
10k
1/2 LT1492
+
10k
6.49k
VS = 5V, 0V
< 1% ERROR FROM 100mV TO 1V, f = 1kHz
10% ERROR AT 10mV, f = 1kHz
1% ERROR AT 5kHz, VIN = 100mVRMS
10% ERROR AT 30kHz, VIN = 100mVRMS 1492/93 TA01
PERCENT OF UNITS (%)
40
VS = 5V, 0V
LT1492 N8, S8 PACKAGES
LT1493 S16 PACKAGE
30
20
10
0
– 2.5 – 2 –1.5 –1 – 0.5 0 0.5 1 1.5 2 2.5
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C)
1492/93 G02
1
LT1492/LT1493
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ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V + to V –) .............................. 36V
Input Current ...................................................... ±15mA
Output Short-Circuit Duration (Note 1) ......... Continuous
Operating Temperature Range ................ – 40°C to 85°C
Specified Temperature Range (Note 2) .....– 40°C to 85°C
Junction Temperature ........................................... 150°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
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PACKAGE/ORDER INFORMATION
ORDER PART
NUMBER
TOP VIEW
OUT A
–IN A 2
+IN A 3
V
–
8 V+
1
LT1492CN8
LT1492CS8
7 OUT B
A
B
6 –IN B
5 +IN B
4
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PART MARKING
TJMAX = 150°C, θJA = 130°C/ W (N8)
TJMAX = 150°C, θJA = 190°C/ W (S8)
1492
ORDER PART
NUMBER
TOP VIEW
16 OUT D
OUT A
1
–IN A
2
+IN A
3
V+
4
+IN B
5
–IN B
6
OUT B
7
10 OUT C
NC
8
9
A
D
15 –IN D
LT1493CS
14 +IN D
13 V –
B
12 +IN C
C
11 –IN C
NC
S PACKAGE
16-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 150°C/ W
Consult factory for Industrial and Military grade parts.
5V ELECTRICAL CHARACTERISTICS
VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, TA = 25°C, unless otherwise noted.
SYMBOL
PARAMETER
TYP
MAX
UNITS
VOS
Input Offset Voltage
CONDITIONS
MIN
100
180
µV
∆VOS
∆Time
Long-Term Input Offset Voltage Stability
0.6
IOS
Input Offset Current
5
20
nA
IB
Input Bias Current
50
100
nA
µV/Mo
Input Noise Voltage
0.1Hz to 10Hz
330
nVP-P
en
Input Noise Voltage Density
fO = 10Hz
fO = 1000Hz
17.3
16.5
nV/√Hz
nV/√Hz
in
Input Noise Current Density
fO = 10Hz
fO = 1000Hz
0.78
0.14
pA/√Hz
pA/√Hz
Input Resistance (Note 3)
Differential Mode
Common Mode
10
40
800
MΩ
MΩ
Input Capacitance
f = 1MHz
10
pF
3.4
0
3.60
–0.25
V
V
Input Voltage Range
CMRR
Common Mode Rejection Ratio
VCM = 0V to 3.4V
86
102
dB
PSRR
Power Supply Rejection Ratio
VS = 2.5V to 12.5V
90
110
dB
2
LT1492/LT1493
5V ELECTRICAL CHARACTERISTICS
VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, TA = 25°C, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
AVOL
Large-Signal Voltage Gain
VO = 0.05V to 3.7V, RL = 2k
175
350
V/mV
Maximum Output Voltage Swing
(Note 4)
Output High, No Load
Output High, ISOURCE = 1mA
Output High, ISOURCE = 15mA
4.2
4.1
3.0
4.35
4.25
3.15
V
V
V
Output Low, No Load
Output Low, ISINK = 1mA
Output Low, ISINK = 15mA
0.003
0.062
0.362
±20
MAX
0.006
0.075
0.500
±60
UNITS
V
V
V
IO
Maximum Output Current (Note 8)
SR
Slew Rate
AV = – 2
1.8
V/µs
GBW
Gain-Bandwidth Product
f = 100kHz
4.5
MHz
IS
Supply Current per Amplifier
Minimum Supply Voltage
mA
425
550
2.1
2.5
µA
V
Full Power Bandwidth
AV = 1, VO = 2.5VP-P
150
kHz
t r, t f
Rise Time, Fall Time
AV = 1, 10% to 90%, VO = 100mV
100
ns
OS
Overshoot
AV = 1, VO = 100mV
20
%
t PD
Propagation Delay
AV = 1, VO = 100mV
100
ns
tS
Settling Time
0.01%, AV = 1, ∆VO = 2V
2.6
µs
Open-Loop Output Resistance
IO = 0mA, f = 2MHz
Total Harmonic Distortion
AV = 1, VO = 1VRMS, f = 20Hz to 20kHz
THD
130
Ω
0.005
%
VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.
SYMBOL
PARAMETER
VOS
Input Offset Voltage
VOS
∆T
CONDITIONS
MIN
TYP
MAX
UNITS
●
120
280
µV
Input Offset Voltage Drift (Note 3)
●
1
3
µV/°C
IOS
Input Offset Current
●
5
25
nA
IB
Input Bias Current
●
55
110
nA
Input Voltage Range
●
●
3.4
0
3.55
– 0.15
V
V
CMRR
Common Mode Rejection Ratio
VCM = 0V to 3.4V
●
84
102
dB
PSRR
Power Supply Rejection Ratio
VS = 2.5V to 12.5V
●
90
110
dB
AVOL
Large-Signal Voltage Gain
VO = 0.05V to 3.7V, RL = 2k
●
140
250
V/mV
Maximum Output Voltage Swing
(Note 4)
Output High, No Load
Output High, ISOURCE = 1mA
Output High, ISOURCE = 15mA
●
●
●
4.1
4.0
2.9
4.25
4.15
3.05
V
V
V
Output Low, No Load
Output Low, ISINK = 1mA
Output Low, ISINK = 15mA
●
●
●
0.004
0.070
0.390
0.007
0.085
0.525
V
V
V
●
470
650
µA
IS
Supply Current per Amplifier
3
LT1492/LT1493
5V ELECTRICAL CHARACTERISTICS
VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, – 40°C ≤ TA ≤ 85°C, unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
TYP
MAX
UNITS
VOS
Input Offset Voltage
●
150
325
µV
VOS
∆T
Input Offset Voltage Drift (Note 3)
●
1
3
µV/°C
IOS
Input Offset Current
●
5
40
nA
IB
Input Bias Current
●
55
130
nA
Input Voltage Range
●
●
3.4
0
3.5
– 0.1
V
V
80
90
dB
CMRR
CONDITIONS
MIN
Common Mode Rejection Ratio
VCM = 0V to 3.4V
●
PSRR
Power Supply Rejection Ratio
VS = 2.5V to 12.5V
●
90
110
dB
AVOL
Large-Signal Voltage Gain
VO = 0.05V to 3.7V, RL = 2k
●
140
220
V/mV
Maximum Output Voltage Swing
(Note 4)
Output High, No Load
Output High, ISOURCE = 1mA
Output High, ISOURCE = 15mA
●
●
●
3.95
3.85
2.75
4.15
4.05
2.95
V
V
V
Output Low, No Load
Output Low, ISINK = 1mA
Output Low, ISINK = 15mA
●
●
●
0.005
0.073
0.400
0.008
0.095
0.575
V
V
V
●
480
700
µA
IS
Supply Current per Amplifier
±15V ELECTRICAL CHARACTERISTICS
VS = ±15V, VCM = 0V, VOUT = 0V, TA = 25°C, unless otherwise noted.
SYMBOL
PARAMETER
TYP
MAX
UNITS
VOS
Input Offset Voltage
CONDITIONS
120
450
µV
IOS
Input Offset Current
5
20
nA
IB
Input Bias Current
45
100
nA
Input Voltage Range
MIN
13.4
– 15.0
13.6
– 15.2
V
V
CMRR
Common Mode Rejection Ratio
VCM = –15V to 13.4V
86
102
dB
PSRR
Power Supply Rejection Ratio
VS = ±2V to ±16V
90
113
dB
AVOL
Large-Signal Voltage Gain
VO = ±10V, RL = 5k
1500
6500
V/mV
Maximum Output Voltage Swing
Output High, ISOURCE = 15mA
Output Low, ISINK = 15mA
12.9
– 14.4
13.15
– 14.6
IO
Maximum Output Current
(Note 8)
±20
SR
Slew Rate
AV = – 2, (Note 5)
2
3
V/µs
GBW
Gain-Bandwidth Product
f = 100kHz
3
5
MHz
IS
Supply Current per Amplifier
Channel Separation
tS
4
±55
500
VO = ±10V, RL = 5k
128
mA
800
140
±1.4
Minimum Supply Voltage
V
V
µA
dB
±2
V
Full Power Bandwidth
AV = 1, VO = 20VP-P
30
kHz
Settling Time
0.01%, AV = 1, ∆VO = 10V
5.8
µs
LT1492/LT1493
±15V ELECTRICAL CHARACTERISTICS
VS = ±15V, VCM = 0V, VOUT = 0V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.
SYMBOL
PARAMETER
VOS
Input Offset Voltage
VOS
∆T
CONDITIONS
MIN
TYP
MAX
UNITS
●
160
550
µV
Input Offset Voltage Drift (Note 3)
●
1
3
µV/°C
IOS
Input Offset Current
●
10
30
nA
IB
Input Bias Current
●
55
120
nA
Input Voltage Range
●
●
13.4
– 15.0
13.5
– 15.1
V
V
CMRR
Common Mode Rejection Ratio
VCM = – 15V to 13.4V
●
84
101
dB
PSRR
Power Supply Rejection Ratio
VS = ±2V to ±16V
●
90
108
dB
AVOL
Large-Signal Voltage Gain
VO = ±10V, RL = 5k
●
1200
4000
V/mV
Maximum Output Voltage Swing
Output High, ISOURCE = 15mA
Output Low, ISINK = 15mA
●
●
12.7
– 14.2
13.0
– 14.6
IS
Supply Current per Amplifier
●
V
V
600
930
µA
TYP
MAX
UNITS
µV
VS = ±15V, VCM = 0V, VOUT = 0V, – 40°C ≤ TA ≤ 85°C, unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
VOS
Input Offset Voltage
●
180
650
VOS
∆T
Input Offset Voltage Drift (Note 3)
●
1
3
µV/°C
IOS
Input Offset Current
●
10
50
nA
IB
Input Bias Current
●
55
150
nA
Input Voltage Range
●
●
13.4
– 15.0
13.45
– 15.05
V
V
CMRR
Common Mode Rejection Ratio
VCM = – 15V to 13.4V
●
82
101
dB
PSRR
Power Supply Rejection Ratio
VS = ±2V to ±16V
●
90
108
dB
AVOL
Large-Signal Voltage Gain
VO = ±10V, RL = 5k
●
1000
3500
V/mV
Maximum Output Voltage Swing
Output High, ISOURCE = 15mA
Output Low, ISINK = 15mA
●
●
12.5
–14.1
12.9
–14.6
V
V
IS
Supply Current per Amplifier
●
620
1000
µA
5
LT1492/LT1493
3.3V ELECTRICAL CHARACTERISTICS
VS = 3.3V, 0V; VCM = 0.5V, VOUT = 0.5V, TA = 25°C, unless otherwise noted. (Note 6)
SYMBOL
PARAMETER
VOS
Input Offset Voltage
CONDITIONS
MIN
Input Voltage Range (Note 7)
Maximum Output Voltage Swing
Output High, No Load
Output High, ISOURCE = 1mA
Output High, ISOURCE = 15mA
MAX
UNITS
100
180
µV
1.7
0
1.9
– 0.2
V
V
2.50
2.40
1.30
2.65
2.55
1.45
V
V
V
Output Low, No Load
Output Low, ISINK = 1mA
Output Low, ISINK = 15mA
IO
TYP
0.003
0.062
0.362
Maximum Output Current
0.006
0.075
0.500
V
V
V
±20
±50
MIN
TYP
MAX
UNITS
120
280
µV
mA
VS = 3.3V, 0V; VCM = 0.5V, VOUT = 0.5V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. (Note 6)
SYMBOL
PARAMETER
VOS
Input Offset Voltage
●
Input Voltage Range (Note 7)
●
●
1.7
0
1.8
– 0.1
V
V
Output High, No Load
Output High, ISOURCE = 1mA
Output High, ISOURCE = 15mA
●
●
●
2.4
2.3
1.2
2.55
2.45
1.35
V
V
V
Output Low, No Load
Output Low, ISINK = 1mA
Output Low, ISINK = 15mA
●
●
●
Maximum Output Voltage Swing
CONDITIONS
0.004
0.070
0.390
0.007
0.085
0.525
V
V
V
TYP
MAX
UNITS
150
325
µV
VS = 3.3V, 0V; VCM = 0.5V, VOUT = 0.5V, – 40°C ≤ TA ≤ 85°C, unless otherwise noted. (Notes 2, 6)
SYMBOL
PARAMETER
VOS
Input Offset Voltage
●
Input Voltage Range (Note 7)
●
●
1.7
0
1.75
– 0.05
V
V
Output High, No Load
Output High, ISOURCE = 1mA
Output High, ISOURCE = 15mA
●
●
●
2.25
2.15
1.05
2.45
2.35
1.25
V
V
V
Output Low, No Load
Output Low, ISINK = 1mA
Output Low, ISINK = 15mA
●
●
●
Maximum Output Voltage Swing
CONDITIONS
The ● denotes specifications that apply over the full operating
temperature range.
Note 1: A heat sink may be required to keep the junction temperature
below absolute maximum when the output is shorted indefinitely.
Note 2: The LT1492/LT1493 are designed, characterized and expected to
meet these extended temperature limits, but are not tested at – 40°C and
85°C. Guaranteed I grade parts are available. Consult factory.
Note 3: This parameter is not 100% tested.
Note 4: Guaranteed by correlation to VS = 3.3V and VS = ±15V tests.
6
MIN
0.005
0.073
0.400
0.008
0.095
0.575
Note 5: Slew rate is measured between ±5V on an output swing of ±10V
on ±15V supplies.
Note 6: Most LT1492/LT1493 electrical characteristics change very little
with supply voltage. See the 5V tables for characteristics not listed in the
3.3V table.
Note 7: Guaranteed by correlation to VS = 5V and VS = ±15V tests.
Note 8: Guaranteed by correlation to VS = 3.3V tests.
V
V
V
LT1492/LT1493
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Distribution of Offset Voltage Drift
with Temperature
Distribution of Input Offset Voltage
50
VS = 5V, 0V
LT1492 N8, S8 PACKAGES
LT1493 S16 PACKAGE
VS = 5V, 0V
LT1492 N8, S8 PACKAGES
LT1493 S16 PACKAGE
40
30
PERCENT OF UNITS (%)
PERCENT OF UNITS (%)
35
25
20
15
10
Distribution of Input Offset Voltage
40
30
20
10
5
25
20
15
10
1492/93 G02
80
VS = ±15V
60
40
40
GAIN
30
VS = 5V
20
20
0
10
– 20
0
– 40
VS = ±2.5V
–10
VS = ±15V
–20
1k
10k
PHASE SHIFT (DEG)
50
100k
1M
FREQUENCY (Hz)
– 60
– 80
10M
4
TA = – 55°C
5.0
4.5
TA = 125°C
4.0
3.5
70
TA = 125°C
60
50
TA = – 55°C
TA = 25°C
40
5
10
20
TOTAL SUPPLY VOLTAGE (V)
1
– 50 – 25
30 40
TA = 125°C
AV = –1
OUTPUT SWING (VP-P)
OVERSHOOT (%)
TA = – 55°C
50
40
AV = 1
AV = 5
20
AV = 10
10
8 12 16 20 24 28 32
TOTAL SUPPLY VOLTAGE (V)
36
1492/93 G07
3
2
1
VS = ± 2.5V
RL = 100k
DISTORTION ≤ 1%
0
0
1
AV = 1
4
30
10
125
5
VS = ± 2.5V
60
TA = 25°C
100
Undistorted Output Swing
vs Frequency, VS = ±2.5V
70
3
50
25
75
0
TEMPERATURE (°C)
1492/93 G06
Capacitive Load Handling
80
4
2
1492/93 G05
AV = –2
RL = 10k
0
VS = ±15V
30
1
Slew Rate vs Supply Voltage
2
3
VS = 5V
20
1492/93 G04
4
AV = – 2
RL = 10k
TA = 25°C
SLEW RATE (V/µs)
60
Slew Rate vs Temperature
5.5
PHASE MARGIN (DEG)
100
PHASE
GAIN-BANDWIDTH
PRODUCT (MHz)
120
70
1492/93 G03
Gain-Bandwidth Product,
Phase Margin vs Supply Voltage
Voltage Gain, Phase vs Frequency
80
0
– 400 –300 –200 –100 0 100 200 300 400
INPUT OFFSET VOLTAGE (µV)
0
– 2.5 – 2 –1.5 –1 – 0.5 0 0.5 1 1.5 2 2.5
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C)
1492/93 G01
VOLTAGE GAIN (dB)
30
5
0
50 100 150 200
–200 –150 –100 – 50 0
INPUT OFFSET VOLTAGE (µV)
SLEW RATE (V/µs)
VS = ±15V
LT1492 N8,
S8 PACKAGES
LT1493
S16 PACKAGE
35
PERCENT OF UNITS (%)
40
100
1000
CAPACITIVE LOAD (pF)
10000
1492/93 G08
1k
10k
100k
FREQUENCY (Hz)
1M
1492/93 G09
7
LT1492/LT1493
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Undistorted Output Swing
vs Frequency, VS = ±15V
AV = –1
20
15
10
5
0
VS = ±15V
RL = 100k
DISTORTION ≤ 1%
10k
FREQUENCY (Hz)
1k
1
5000
VS = 5V, 0V
VOUT = 3VP-P
RL = 2k
OPEN-LOOP VOLTAGE GAIN (V/mV)
OUTPUT SWING (VP-P)
25
TOTAL HARMONIC DISTORTION AND NOISE (%)
30
AV = 1
Open-Loop Voltage Gain
vs Supply Voltage
Total Harmonic Distortion
and Noise vs Frequency
0.1
0.01
AV = 10
AV = 1
0.001
100
10
1k
10k
FREQUENCY (Hz)
TA = 125°C
1000
0
0
4
8 12 16 20 24 28 32 36 40
TOTAL SUPPLY VOLTAGE (V)
1492/93 G12
5
1492/93 G13
2.5
Voltage Gain vs Load Resistance
100000
VS = 5V, 0V
OPEN-LOOP VOLTAGE GAIN (V/mV)
4
POSITIVE OUTPUT SATURATION, V + – VOUT (V)
INPUT, 5µV/DIV
RL = 2k
2
3
OUTPUT (V)
2000
Positive Output Saturation
Voltage vs Load Current
RL = 5k
1
TA = 25°C
1492/93 G11
Open-Loop Gain, VS = 5V
0
3000
100k
1492/93 G10
TA = – 55°C
4000
0.0001
100k
RL = 2k
2.0
1.5
1.0 T = –55°C
A
0.5
TA = 125°C
0
– 0.001
– 0.01
TA = 25°C
–1
– 10
– 0.1
LOAD CURRENT (mA)
TA = 25°C
10000
VS = ±15V
1000
VS = 5V, 0V
100
10
– 100
0
2
4
6
8
LOAD RESISTANCE (kΩ)
1492/93 G15
1492/93 G14
Negative Output Saturation
Voltage vs Load Current
Open-Loop Gain, VS = ±15V
RL = 5k
– 10
0
OUTPUT (V)
10
1492/93 G16
Channel Separation vs Frequency
130
VS = 5V, 0V
100
10
TA = 125°C
110
100
90
80
70
TA = 25°C, – 55°C
1
0.001
60
0.01
0.1
1
10
LOAD CURRENT (mA)
100
1492/93 G17
8
VS = ±15V
120
CHANNEL SEPARATION (dB)
RL = 2k
NEGATIVE OUTPUT SATURATION (mV)
INPUT, 5µV/DIV
1000
10
1k
10k
100k
1M
FREQUENCY (Hz)
10M
1492/93 G18
LT1492/LT1493
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Output Short-Circuit Current
vs Temperature
Output Impedance vs Frequency
1000
70
OUTPUT IMPEDANCE (Ω)
VS = ± 2.5V
SINKING
60
VS = ±15V
SOURCING
OR SINKING
50
40
5V Small-Signal Response
VS = ± 2.5V
100
20mV/DIV
VS = ± 2.5V
SOURCING
AV = 100
10
AV = 10
1
30
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
0.1
10k
100k
1M
FREQUENCY (Hz)
1492/93 G19
10M
1492/93 G20
5V Large-Signal Response
±15V Small-Signal Response
2µs/DIV
1492/93 G22
20mV/DIV
500mV/DIV
5V Large-Signal Response
500mV/DIV
VS = 5V
AV = 1
1492/93 G21
500ns/DIV
VS = 5V
AV = 1
AV = 1
VS = 5V
AV = – 1
RF = RG = 2k
±15V Large-Signal Response
VS = ±15V
AV = 1
1492/93 G23
2µs/DIV
1492/93 G24
500ns/DIV
Settling Time to 1mV
vs Output Step
±15V Large-Signal Response
10
VS = ±15V
8
5V/DIV
OUTPUT STEP (V)
6
5V/DIV
OUTPUT SHORT-CIRCUIT CURRENT (mA)
80
VS = ±15V
AV = 1
5µs/DIV
1492/93 G25
VS = ±15V
AV = – 1
RF = RG = 2k
INVERTING
4
NONINVERTING
2
0
–2
–4
–6
5µs/DIV
1492/93 G26
NONINVERTING
–8
INVERTING
–10
0
1
3
4
2
SETTLING TIME (µs)
5
6
1492/93 G27
9
LT1492/LT1493
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Temperature
Supply Current vs Supply Voltage
VS = ±15V
0.45
VS = 5V, 0V
0.35
0.25
– 50 – 25
0
50
75
25
TEMPERATURE (°C)
100
10
0.8
0.6
TA = 125°C
0.4
TA = 25°C
TA = – 55°C
0.2
0
1
2
3
4
SUPPLY VOLTAGE (V)
1492/93 G28
4
2
VS = ± 2.5V
0
VS = ±15V
–2
–4
–6
–10
5
10 20 30 40 50 60 70 80 90 100
TIME (SEC)
0
1492/93 G30
Input Bias Current
vs Common Mode Voltage
Common Mode Range
vs Temperature
V+
20
VS = 5V, 0V
VS = 5V, 0V
0
60
55
50
IOS
45
+ IB
– IB
– 40
TA = – 55°C
– 60
– 80
TA = 125°C
–100
–120
–140
–160
V+ – 1
V+ – 2
V– + 2
V–
TA = 25°C
–180
35
COMMON MODE RANGE (V)
INPUT BIAS CURRENT (nA)
– 20
40
6
1492/93 G29
Input Bias Current vs Temperature
65
N8 PACKAGE
RL = ∞
8
–8
0
125
CHANGE IN OFFSET VOLTAGE (µV)
0.55
INPUT BIAS CURRENT (nA)
Warm-Up Drift vs Time
1.0
SUPPLY CURRENT PER AMPLIFIER (mA)
SUPPLY CURRENT PER AMPLIFIER (mA)
0.65
– 200
30
– 50 – 25
50
25
75
0
TEMPERATURE (°C)
100
– 220
125
0
2
3
1
COMMON MODE VOLTAGE (V)
–1
2.0
1.8
1.6
VOLTAGE NOISE
14
1.4
12
1.2
10
1.0
8
0.8
6
0.6
4
0.4
CURRENT NOISE
2
0.2
0
10
100
1k
FREQUENCY (Hz)
0
10k
1492/93 G34
10
100
COMMON MODE REJECTION RATIO (dB)
INPUT NOISE VOLTAGE DENSITY (nV/√Hz)
VS = ±15V
TA = 25°C
Common Mode Rejection Ratio
vs Frequency
INPUT NOISE CURRENT DENSITY (pA/√Hz)
16
25
50
75
0
TEMPERATURE (°C)
125
Input Referred Power Supply
Rejection Ratio vs Frequency
120
VS = ± 2.5V
80
60
40
20
0
10k
100
1492/93 G33
POWER SUPPLY REJECTION RATIO (dB)
Input Noise Current, Noise Voltage
Density vs Frequency
20
– 25
1492/93 G32
1492/93 G31
18
V– – 1
– 50
4
VS = ±15V
AV = 100
100
80
60
POSITIVE SUPPLY
40
NEGATIVE SUPPLY
20
100k
1M
FREQUENCY (Hz)
10M
1492/93 G35
1k
10k
100k
1M
FREQUENCY (Hz)
10M
1492/93 G26
LT1492/LT1493
U
W
U
U
APPLICATIONS INFORMATION
Supply Voltage
The LT1492/LT1493 op amps are fully functional and all
internal bias circuits are in regulation with 2.1V of supply.
The amplifiers will continue to function with as little as
1.6V, although the input common mode range and the
phase margin are about gone. The minimum operating
supply voltage is guaranteed by the PSRR tests that are
done with the input common mode equal to 500mV and a
minimum supply voltage of 2.5V.
The positive supply pin of the LT1492/LT1493 should be
bypassed with a small capacitor (about 0.01µF) within an
inch of the pin. When driving heavy loads and for good
settling time, an additional 4.7µF capacitor should be
used. When using split supplies, the same is true for the
negative supply pin.
Power Dissipation
The LT1492/LT1493 combine high speed and large output
drive in small packages. Because of the wide supply
voltage range, it is possible to exceed the maximum
junction temperature under certain conditions. Maximum
junction temperature (TJ) is calculated from the ambient
temperature (TA) and power dissipation (PD) as follows:
LT1492CN8: TJ = TA + (PD • 130°C/W)
LT1492CS8: TJ = TA + (PD • 190°C/W)
LT1493CS: TJ = TA + (PD • 150°C/W)
Worst-case power dissipation occurs at the maximum
supply current and when the output voltage is at 1/2 of
either supply voltage (or the maximum swing if less than
1/2 supply voltage). For each amplifier PDMAX is:
PDMAX =
(V +
– V –)(I
+ 2
SMAX) + (V /2) /RL
Example: LT1493 at 70°C, VS = ±15V, RL = 1k
PDMAX = (30V)(930µA) + (7.5V)2/1kΩ = 84.2mW
TJMAX = 70°C + (4 • 84.2mW)(150°C/W) = 121°C
Inputs
Typically, at room temperature, the inputs of the LT1492/
LT1493 can common mode 400mV below ground (V –)
and to within 1.2V of the positive supply with the amplifier
still functional. However, the input bias current will shift as
shown in the characteristic curves. For full precision
performance, the common mode range should be limited
between ground (V –) and 1.5V below the positive supply.
When either of the inputs is taken below ground (V –) by
more than about 700mV, that input current will increase
dramatically. The current is limited by internal 100Ω
resistors between the input pins and diodes to each
supply. The output will remain low (no phase reversal) for
inputs 1.3V below ground (V –). If the output does not have
to sink current, such as in a single supply system with a 1k
load to ground, there is no phase reversal for inputs up to
8V below ground.
There are no clamps across the inputs of the LT1492/
LT1493 and therefore each input can be forced to any
voltage between the supplies. The input current will remain constant at about 50nA over most of this range.
When an input gets closer than 1.5V to the positive supply,
that input current will gradually decrease to zero until the
input goes above the supply, then will increase due to the
previously mentioned diodes. If the inverting input is held
more positive than the noninverting input by 200mV or
more, while at the same time the noninverting input is
within 300mV to ground (V –), then the supply current will
increase by 1mA and the noninverting input current will
increase to about 10µA. This should be kept in mind in
comparator applications where the inverting input stays
above ground (V –) and the noninverting input is at or near
ground (V –).
Output
The output of the LT1492/LT1493 will swing to within
0.65V of the positive supply and to within 3mV of the
negative supply with no load. Under loaded conditions see
the Typical Performance curves for the output saturation
voltage characteristics.
The output of the LT1492/LT1493 has reverse-biased
diodes to each supply. If the output is forced beyond either
supply, unlimited currents will flow. If the current is
transient and limited to several hundred milliamps, no
damage will occur.
11
LT1492/LT1493
U
W
U
U
APPLICATIONS INFORMATION
Feedback Components
Comparator Applications
Because the input currents of the LT1492/LT1493 are less
than 100nA, it is possible to use high value feedback
resistors to set the gain. However, care must be taken to
insure that the pole that is formed by the feedback resistors and the input capacitance does not degrade the
stability of the amplifier. For example, if a single supply,
noninverting gain of 2 is set with two 62k resistors, the
LT1492/LT1493 will probably oscillate. This is because
the amplifier goes open-loop at 1MHz (6dB of gain) and
has 50° of phase margin. The feedback resistors and the
10pF input capacitance generate a pole at 500kHz that
introduces 63° of phase shift at 1MHz! The solution is
simple, lower the values of the resistors or add a feedback
capacitor of 10pF or more.
Sometimes it is desirable to use an op amp as a comparator. When operating the LT1492/LT1493 on a single 3.3V
or 5V supply, the output interfaces directly with most TTL
and CMOS logic.
The response time of the LT1492/LT1493 is a strong
function of the amount of input overdrive as shown in the
following photos. These amplifiers are unity-gain stable
op amps and not fast comparators, therefore, the logic
being driven may oscillate due to the long transition time.
The output can be speeded up by adding 20mV or more of
hysteresis (positive feedback), but the offset is then a
function of the input direction.
Comparator Response (+)
20mV, 10mV, 5mV, 2mV Overdrives
Capacitive Loading
Maximum Capacitive Load vs Load Current
OUTPUT (V)
2
0
100
0
VS = 5V
RL = ∞
SOURCING
SINKING
VS = ± 2.5V
1492/93 AI02
VS = ±15V
4
VS = ± 2.5V
100
VS = ±15V
10
1
10
LOAD CURRENT (mA)
1492/93 AI01
2
0
100
INPUT (mV)
0.1
100
0
VS = 5V
RL = ∞
12
20µs/DIV
Comparator Response (–)
20mV, 10mV, 5mV, 2mV Overdrives
1000
OUTPUT (V)
MAXIMUM CAPACITIVE LOAD (pF)
10000
4
INPUT (mV)
The LT1492/LT1493 are optimized for low voltage, single
supply operation. The Maximum Capacitive Load vs Load
Current typical performance curve shows the circuit performance without any load resistance. When the output is
sinking current or driving heavy loads with high supplies,
capacitive load handling is degraded.
20µs/DIV
1492/93 AI02
LT1492/LT1493
W
W
SI PLIFIED SCHE ATIC
V+
I1
I4
I3
I2
I6
I5
Q13
BIAS
CM
Q14
Q4
Q3
–IN
Q15
+IN
Q1
Q11
Q2
OUT
RF
Q12
Q7
CF
Q10
Q8
Q5
Q9
Q6
Q16
CO
I7
I8
CI
V–
1492/93 SS
U
TYPICAL APPLICATIONS
1A Voltage-Controlled Current Source
1A Voltage-Controlled Current Sink
V+
V+
1Ω
1k
V+
RL
1k
1k
200pF
–
VIN
VIN
100Ω
1/2
LT1492
1k
1/2
LT1492
Si9430DY
P-CHANNEL
+
–
IOUT
V
IOUT = IN
1Ω
tr < 1µs
IOUT
+
100Ω
Si9410DY
N-CHANNEL
100pF
1k
RL
V
IOUT = IN
1Ω
tr < 1µs
1492/93 TA05
1Ω
1492/93 TA06
Ground Current Sense Amplifier
V+
5V
0.1µF
LOAD
+
1/2
LT1492
IIN
VO = 1V/A
–
0.05Ω
1910Ω
100Ω
OFFSET ≤ 3.6mA
BANDWIDTH = 250kHz
t r = 1µs
100pF
1492/93 TA07
13
LT1492/LT1493
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400*
(10.160)
MAX
8
7
6
5
1
2
3
4
0.255 ± 0.015*
(6.477 ± 0.381)
0.300 – 0.325
(7.620 – 8.255)
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
(
+0.635
–0.381
0.125
(3.175)
MIN
0.005
(0.127)
MIN
+0.025
0.325 –0.015
8.255
0.130 ± 0.005
(3.302 ± 0.127)
0.045 – 0.065
(1.143 – 1.651)
)
0.018 ± 0.003
(0.457 ± 0.076)
0.100 ± 0.010
(2.540 ± 0.254)
0.015
(0.380)
MIN
N8 0695
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
8
7
6
5
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
14
0.014 – 0.019
(0.355 – 0.483)
2
3
4
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
TYP
SO8 0996
LT1492/LT1493
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
S Package
16-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.386 – 0.394*
(9.804 – 10.008)
16
15
14
13
12
11
10
9
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
2
3
4
5
6
0.053 – 0.069
(1.346 – 1.752)
0.014 – 0.019
(0.355 – 0.483)
8
0.004 – 0.010
(0.101 – 0.254)
0° – 8° TYP
0.016 – 0.050
0.406 – 1.270
7
0.050
(1.270)
TYP
S16 0695
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
15
LT1492/LT1493
U
TYPICAL APPLICATION
Single Supply 100kHz 4th Order Butterworth Filter
Frequency Response
10
100pF
11.3k
6.81k
VIN
330pF
0
5.23k
–
5.23k
10.2k
–10
–20
–
1/2 LT1492
+
V+
47pF
1/2 LT1492
1000pF
VOUT
+
V +/2
1492/93 TA03
GAIN (dB)
6.81k
–30
–40
–50
–60
–70
–80
–90
100
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1492/93 TA04
RELATED PARTS
PART NUMBER
®
DESCRIPTION
COMMENTS
High DC Accuracy, 10 µV VOS(MAX) , 100nV/ °C Drift, 1MHz
GBW, 1V/ µs Slew Rate, Max Supply Current 2.2mA
LTC 1152
Rail-to-Rail Input and Output, Zero-Drift Op Amp
LT1211/LT1212
Dual/Quad 14MHz, 7V/ µs, Single Supply Precision Op Amps
Input Common Mode Includes Ground, 275 µV VOS(MAX) ,
6µV/°C Max Drift, Max Supply Current 1.8mA per Amplifier
LT1213/LT1214
Dual/Quad 28MHz, 12V/ µs, Single Supply Precision Op Amps
Input Common Mode Includes Ground, 275 µV VOS(MAX) ,
6µV/°C Max Drift, Max Supply Current 3.5mA per Amplifier
LT1215/LT1216
Dual/Quad 23MHz, 50V/ µs, Single Supply Precision Op Amps
Input Common Mode Includes Ground, 450
Max Supply Current 6.6mA per Amplifier
LT1366/LT1367
Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps
475 µV VOS(MAX) , 400kHz GBW, 0.13V/ µs Slew Rate,
Max Supply Current 520 µA per Amplifier
LT1490/LT1491
Dual/Quad Micropower, Rail-to-Rail Input and Output Op Amps
Max Supply Current 50
µA per Amplifier, 200kHz GBW, 0.07V/ µs
Slew Rate, Operates with Inputs 44V Above V – Independent of V +
LT1498/LT1499
Dual/Quad Rail-to-Rail Input and Output Precision C-Load
Op Amps
TM
µV VOS(MAX) ,
475µV VOS(MAX) , 10MHz GBW, 6V/ µs Slew Rate,
Max Supply Current 2.2mA per Amplifier
C-Load is a trademark of Linear Technology Corporation.
16
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 ● (408) 432-1900
FAX: (408) 434-0507 ● TELEX: 499-3977 ● www.linear-tech.com
14923f LT/TP 1097 4K • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 1997