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LT1492/LT1493 5MHz, 3V/s, Low Power Single Supply, Dual and Quad Precision Op Amps
FEATURES
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DESCRIPTION
The LT (R)1492/LT1493 are dual/quad, low power, single supply precision op amps with 5MHz gain-bandwidth product, 3V/s slew rate and only 450A of quiescent supply current per amplifier. With a maximum input offset voltage of only 180V, 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/s LT1211/LT1212, the 28MHz, 12V/s LT1213/LT1214 or the 23MHz, 50V/s LT1215/LT1216.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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Gain-Bandwidth Product: 5MHz Typ Slew Rate: 3V/s Typ Low Supply Current per Amplifier: 0.55mA Max Input Offset Voltage: 180V Max Input Offset Voltage Drift: 3V/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
APPLICATIONS
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Battery-Powered Systems Portable Instrumentation Active Filters Photodiode Amplifiers DAC Current to Voltage Amplifiers
TYPICAL APPLICATION
50
Precision AC to DC Converter (Full Wave Rectifier and Filter)
40
PERCENT OF UNITS (%)
4.99k 5V 10k VIN
+
1/2 LT1492 15k
10k
-
1/2 LT1492
-
10k 6.49k
+
VOUT DC 10F
+
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
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Distribution of Offset Voltage Drift with Temperature
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 (V/C)
1492/93 G02
1
LT1492/LT1493
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V + to V -) .............................. 36V Input Current ...................................................... 15mA Output Short-Circuit Duration (Note 1) ......... Continuous Operating Temperature Range ................ - 40C to 85C Specified Temperature Range (Note 2) .....- 40C to 85C Junction Temperature ........................................... 150C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER INFORMATION
TOP VIEW OUT A 1 A B 6 -IN B 5 +IN B 8 V+ 7 OUT B
ORDER PART NUMBER LT1492CN8 LT1492CS8
-IN A 2 +IN A 3 V
-
4
N8 PACKAGE 8-LEAD PDIP S8 PACKAGE 8-LEAD PLASTIC SO
S8 PART MARKING 1492
TJMAX = 150C, JA = 130C/ W (N8) TJMAX = 150C, JA = 190C/ W (S8)
Consult factory for Industrial and Military grade parts.
5V ELECTRICAL CHARACTERISTICS
VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, TA = 25C, unless otherwise noted.
SYMBOL VOS VOS Time IOS IB en in PARAMETER Input Offset Voltage Long-Term Input Offset Voltage Stability Input Offset Current Input Bias Current Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Input Resistance (Note 3) Input Capacitance Input Voltage Range CMRR PSRR Common Mode Rejection Ratio Power Supply Rejection Ratio VCM = 0V to 3.4V VS = 2.5V to 12.5V 0.1Hz to 10Hz fO = 10Hz fO = 1000Hz fO = 10Hz fO = 1000Hz Differential Mode Common Mode f = 1MHz 3.4 0 86 90 10 CONDITIONS MIN TYP 100 0.6 5 50 330 17.3 16.5 0.78 0.14 40 800 10 3.60 -0.25 102 110 20 100 MAX 180 UNITS V V/Mo nA nA nVP-P nV/Hz nV/Hz pA/Hz pA/Hz M M pF V V dB dB
2
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TOP VIEW OUT A -IN A +IN A V+ +IN B -IN B OUT B NC 1 2 3 4 5 6 7 8 B C A D 16 OUT D 15 -IN D 14 +IN D 13 V - 12 +IN C 11 -IN C 10 OUT C 9 NC
ORDER PART NUMBER LT1493CS
S PACKAGE 16-LEAD PLASTIC SO
TJMAX = 150C, JA = 150C/ W
LT1492/LT1493
5V ELECTRICAL CHARACTERISTICS
VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, TA = 25C, unless otherwise noted.
SYMBOL AVOL PARAMETER Large-Signal Voltage Gain Maximum Output Voltage Swing (Note 4) CONDITIONS VO = 0.05V to 3.7V, RL = 2k Output High, No Load Output High, ISOURCE = 1mA Output High, ISOURCE = 15mA Output Low, No Load Output Low, ISINK = 1mA Output Low, ISINK = 15mA IO SR GBW IS Maximum Output Current (Note 8) Slew Rate Gain-Bandwidth Product Supply Current per Amplifier Minimum Supply Voltage Full Power Bandwidth t r, t f OS t PD tS THD Rise Time, Fall Time Overshoot Propagation Delay Settling Time Open-Loop Output Resistance Total Harmonic Distortion AV = 1, VO = 2.5VP-P AV = 1, 10% to 90%, VO = 100mV AV = 1, VO = 100mV AV = 1, VO = 100mV 0.01%, AV = 1, VO = 2V IO = 0mA, f = 2MHz AV = 1, VO = 1VRMS, f = 20Hz to 20kHz AV = - 2 f = 100kHz 20 MIN 175 4.2 4.1 3.0 TYP 350 4.35 4.25 3.15 0.003 0.062 0.362 60 1.8 4.5 425 2.1 150 100 20 100 2.6 130 0.005 550 2.5 0.006 0.075 0.500 MAX UNITS V/mV V V V V V V mA V/s MHz A V kHz ns % ns s %
VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, 0C TA 70C, unless otherwise noted.
SYMBOL VOS VOS T IOS IB PARAMETER Input Offset Voltage Input Offset Voltage Drift (Note 3) Input Offset Current Input Bias Current Input Voltage Range CMRR PSRR AVOL Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing (Note 4) VCM = 0V to 3.4V VS = 2.5V to 12.5V VO = 0.05V to 3.7V, RL = 2k Output High, No Load Output High, ISOURCE = 1mA Output High, ISOURCE = 15mA Output Low, No Load Output Low, ISINK = 1mA Output Low, ISINK = 15mA IS Supply Current per Amplifier CONDITIONS
q q q q q q q q q q q q q q q q
MIN
TYP 120 1 5 55
MAX 280 3 25 110
UNITS V V/C nA nA V V dB dB V/mV V V V
3.4 0 84 90 140 4.1 4.0 2.9
3.55 - 0.15 102 110 250 4.25 4.15 3.05 0.004 0.070 0.390 470 0.007 0.085 0.525 650
V V V A
3
LT1492/LT1493
5V ELECTRICAL CHARACTERISTICS
VS = 5V, 0V; VCM = 0.5V, VOUT = 0.5V, - 40C TA 85C, unless otherwise noted. (Note 2)
SYMBOL VOS VOS T IOS IB PARAMETER Input Offset Voltage Input Offset Voltage Drift (Note 3) Input Offset Current Input Bias Current Input Voltage Range CMRR PSRR AVOL Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing (Note 4) VCM = 0V to 3.4V VS = 2.5V to 12.5V VO = 0.05V to 3.7V, RL = 2k Output High, No Load Output High, ISOURCE = 1mA Output High, ISOURCE = 15mA Output Low, No Load Output Low, ISINK = 1mA Output Low, ISINK = 15mA IS Supply Current per Amplifier CONDITIONS
q q q q q q q q q q q q q q q q
MIN
TYP 150 1 5 55
MAX 325 3 40 130
UNITS V V/C nA nA V V dB dB V/mV V V V
3.4 0 80 90 140 3.95 3.85 2.75
3.5 - 0.1 90 110 220 4.15 4.05 2.95 0.005 0.073 0.400 480 0.008 0.095 0.575 700
V V V A
15V ELECTRICAL CHARACTERISTICS
VS = 15V, VCM = 0V, VOUT = 0V, TA = 25C, unless otherwise noted.
SYMBOL VOS IOS IB PARAMETER Input Offset Voltage Input Offset Current Input Bias Current Input Voltage Range CMRR PSRR AVOL Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing IO SR GBW IS Maximum Output Current Slew Rate Gain-Bandwidth Product Supply Current per Amplifier Channel Separation Minimum Supply Voltage Full Power Bandwidth tS Settling Time AV = 1, VO = 20VP-P 0.01%, AV = 1, VO = 10V VO = 10V, RL = 5k 128 VCM = -15V to 13.4V VS = 2V to 16V VO = 10V, RL = 5k Output High, ISOURCE = 15mA Output Low, ISINK = 15mA (Note 8) AV = - 2, (Note 5) f = 100kHz 13.4 - 15.0 86 90 1500 12.9 - 14.4 20 2 3 CONDITIONS MIN TYP 120 5 45 13.6 - 15.2 102 113 6500 13.15 - 14.6 55 3 5 500 140 1.4 30 5.8 2 800 MAX 450 20 100 UNITS V nA nA V V dB dB V/mV V V mA V/s MHz A dB V kHz s
4
LT1492/LT1493
15V ELECTRICAL CHARACTERISTICS
VS = 15V, VCM = 0V, VOUT = 0V, 0C TA 70C, unless otherwise noted.
SYMBOL VOS VOS T IOS IB PARAMETER Input Offset Voltage Input Offset Voltage Drift (Note 3) Input Offset Current Input Bias Current Input Voltage Range CMRR PSRR AVOL Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing IS Supply Current per Amplifier VCM = - 15V to 13.4V VS = 2V to 16V VO = 10V, RL = 5k Output High, ISOURCE = 15mA Output Low, ISINK = 15mA CONDITIONS
q q q q q q q q q q q q
MIN
TYP 160 1 10 55
MAX 550 3 30 120
UNITS V V/C nA nA V V dB dB V/mV V V
13.4 - 15.0 84 90 1200 12.7 - 14.2
13.5 - 15.1 101 108 4000 13.0 - 14.6 600 930
A
VS = 15V, VCM = 0V, VOUT = 0V, - 40C TA 85C, unless otherwise noted. (Note 2)
SYMBOL VOS VOS T IOS IB PARAMETER Input Offset Voltage Input Offset Voltage Drift (Note 3) Input Offset Current Input Bias Current Input Voltage Range CMRR PSRR AVOL Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing IS Supply Current per Amplifier VCM = - 15V to 13.4V VS = 2V to 16V VO = 10V, RL = 5k Output High, ISOURCE = 15mA Output Low, ISINK = 15mA CONDITIONS
q q q q q q q q q q q q
MIN
TYP 180 1 10 55
MAX 650 3 50 150
UNITS V V/C nA nA V V dB dB V/mV V V
13.4 - 15.0 82 90 1000 12.5 -14.1
13.45 - 15.05 101 108 3500 12.9 -14.6 620 1000
A
5
LT1492/LT1493
3.3V ELECTRICAL CHARACTERISTICS
VS = 3.3V, 0V; VCM = 0.5V, VOUT = 0.5V, TA = 25C, unless otherwise noted. (Note 6)
SYMBOL VOS PARAMETER Input Offset Voltage Input Voltage Range (Note 7) Maximum Output Voltage Swing Output High, No Load Output High, ISOURCE = 1mA Output High, ISOURCE = 15mA Output Low, No Load Output Low, ISINK = 1mA Output Low, ISINK = 15mA IO Maximum Output Current 20 1.7 0 2.50 2.40 1.30 CONDITIONS MIN TYP 100 1.9 - 0.2 2.65 2.55 1.45 0.003 0.062 0.362 50 0.006 0.075 0.500 MAX 180 UNITS V V V V V V V V V mA
VS = 3.3V, 0V; VCM = 0.5V, VOUT = 0.5V, 0C TA 70C, unless otherwise noted. (Note 6)
SYMBOL VOS PARAMETER Input Offset Voltage Input Voltage Range (Note 7) Maximum Output Voltage Swing Output High, No Load Output High, ISOURCE = 1mA Output High, ISOURCE = 15mA Output Low, No Load Output Low, ISINK = 1mA Output Low, ISINK = 15mA CONDITIONS
q q q q q q q q q
MIN 1.7 0 2.4 2.3 1.2
TYP 120 1.8 - 0.1 2.55 2.45 1.35 0.004 0.070 0.390
MAX 280
UNITS V V V V V V
0.007 0.085 0.525
V V V
VS = 3.3V, 0V; VCM = 0.5V, VOUT = 0.5V, - 40C TA 85C, unless otherwise noted. (Notes 2, 6)
SYMBOL VOS PARAMETER Input Offset Voltage Input Voltage Range (Note 7) Maximum Output Voltage Swing Output High, No Load Output High, ISOURCE = 1mA Output High, ISOURCE = 15mA Output Low, No Load Output Low, ISINK = 1mA Output Low, ISINK = 15mA The q 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 - 40C and 85C. 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. CONDITIONS
q q q q q q q q q
MIN 1.7 0 2.25 2.15 1.05
TYP 150 1.75 - 0.05 2.45 2.35 1.25 0.005 0.073 0.400
MAX 325
UNITS V V V V V V
0.008 0.095 0.575
V V V
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.
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LT1492/LT1493 TYPICAL PERFORMANCE CHARACTERISTICS
Distribution of Input Offset Voltage
40 35 50 VS = 5V, 0V LT1492 N8, S8 PACKAGES LT1493 S16 PACKAGE
PERCENT OF UNITS (%)
25 20 15 10 5 0 50 100 150 200 -200 -150 -100 - 50 0 INPUT OFFSET VOLTAGE (V)
1492/93 G01
PERCENT OF UNITS (%)
PERCENT OF UNITS (%)
30
Voltage Gain, Phase vs Frequency
GAIN-BANDWIDTH PRODUCT (MHz)
80 70 60 PHASE VS = 15V 120 100 80
VOLTAGE GAIN (dB)
SLEW RATE (V/s)
50 40 30 20 10 0 -10 -20 1k 10k VS = 2.5V VS = 15V 100k 1M FREQUENCY (Hz) GAIN VS = 5V
PHASE MARGIN (DEG)
Slew Rate vs Supply Voltage
4
AV = -2 RL = 10k TA = 125C
OVERSHOOT (%)
3 TA = 25C
50 40 30 20 10 AV = 10 AV = 1 AV = 5
OUTPUT SWING (VP-P)
SLEW RATE (V/s)
2
TA = - 55C
1 0 4 8 12 16 20 24 28 32 TOTAL SUPPLY VOLTAGE (V) 36
UW
1492/93 G04
1492/93 G07
Distribution of Offset Voltage Drift with Temperature
VS = 5V, 0V LT1492 N8, S8 PACKAGES LT1493 S16 PACKAGE 40 35 30 25 20 15 10 5 0 - 2.5 - 2 -1.5 -1 - 0.5 0 0.5 1 1.5 2 2.5 OFFSET VOLTAGE DRIFT WITH TEMPERATURE (V/C)
1492/93 G02
Distribution of Input Offset Voltage
VS = 15V LT1492 N8, S8 PACKAGES LT1493 S16 PACKAGE
40
30
20
10
0 - 400 -300 -200 -100 0 100 200 300 400 INPUT OFFSET VOLTAGE (V)
1492/93 G03
Gain-Bandwidth Product, Phase Margin vs Supply Voltage
5.5 5.0 4.5 4.0 3.5 70 60 50 40 30 20 1 5 10 20 TOTAL SUPPLY VOLTAGE (V) 30 40 TA = 125C TA = - 55C TA = 25C TA = 125C
3 4
Slew Rate vs Temperature
AV = - 2 RL = 10k
TA = - 55C
TA = 25C
PHASE SHIFT (DEG)
60 40 20 0 - 20 - 40 - 60 - 80 10M
VS = 15V
2 VS = 5V
1 - 50 - 25
50 25 75 0 TEMPERATURE (C)
100
125
1492/93 G05
1492/93 G06
Capacitive Load Handling
80 70 60 4 VS = 2.5V 5
Undistorted Output Swing vs Frequency, VS = 2.5V
AV = -1 AV = 1
3
2
1
0 10 100 1000 CAPACITIVE LOAD (pF) 10000
1492/93 G08
0 1k
VS = 2.5V RL = 100k DISTORTION 1% 10k 100k FREQUENCY (Hz) 1M
1492/93 G09
7
LT1492/LT1493 TYPICAL PERFORMANCE CHARACTERISTICS
Undistorted Output Swing vs Frequency, VS = 15V
TOTAL HARMONIC DISTORTION AND NOISE (%)
30 25 OUTPUT SWING (VP-P) 20 15 10 5 0 VS = 15V RL = 100k DISTORTION 1% 1k 10k FREQUENCY (Hz) 100k
1492/93 G10
OPEN-LOOP VOLTAGE GAIN (V/mV)
AV = 1
AV = -1
Open-Loop Gain, VS = 5V
POSITIVE OUTPUT SATURATION, V + - VOUT (V)
INPUT, 5V/DIV
2.0
OPEN-LOOP VOLTAGE GAIN (V/mV)
RL = 2k RL = 5k
0
1
2 3 OUTPUT (V)
Open-Loop Gain, VS = 15V
1000
NEGATIVE OUTPUT SATURATION (mV)
INPUT, 5V/DIV
RL = 2k
CHANNEL SEPARATION (dB)
RL = 5k
- 10
0 OUTPUT (V)
8
UW
4
Total Harmonic Distortion and Noise vs Frequency
1 VS = 5V, 0V VOUT = 3VP-P RL = 2k 0.1
Open-Loop Voltage Gain vs Supply Voltage
5000 RL = 2k TA = - 55C
4000
3000
0.01
TA = 25C
AV = 10
2000 TA = 125C 1000
0.001
AV = 1
0.0001 10 100 1k 10k FREQUENCY (Hz) 100k
1492/93 G11
0
0
4
8 12 16 20 24 28 32 36 40 TOTAL SUPPLY VOLTAGE (V)
1492/93 G12
Positive Output Saturation Voltage vs Load Current
2.5 VS = 5V, 0V
100000
Voltage Gain vs Load Resistance
TA = 25C VS = 15V
10000
1.5
1000
VS = 5V, 0V
1.0 T = -55C A 0.5 TA = 125C 0 - 0.001 - 0.01 TA = 25C -1 - 10 - 0.1 LOAD CURRENT (mA) - 100
100
5
1492/93 G13
10 0 2 4 6 8 LOAD RESISTANCE (k) 10
1492/93 G15
1492/93 G14
Negative Output Saturation Voltage vs Load Current
VS = 5V, 0V
Channel Separation vs Frequency
130 120 110 100 90 80 70 60 VS = 15V
100
10
TA = 125C TA = 25C, - 55C
10
1492/93 G16
1 0.001
0.01
0.1 1 10 LOAD CURRENT (mA)
100
1k
10k
100k 1M FREQUENCY (Hz)
10M
1492/93 G18
1492/93 G17
LT1492/LT1493 TYPICAL PERFORMANCE CHARACTERISTICS
Output Short-Circuit Current vs Temperature
80
OUTPUT SHORT-CIRCUIT CURRENT (mA)
VS = 2.5V SOURCING 70 VS = 2.5V SINKING 60 VS = 15V SOURCING OR SINKING
OUTPUT IMPEDANCE ()
10
AV = 100
50
1
AV = 10 AV = 1 VS = 5V AV = 1 10M
1492/93 G20
40
20mV/DIV
30 -50 -25
50 25 0 75 TEMPERATURE (C)
5V Large-Signal Response
500mV/DIV
500mV/DIV
20mV/DIV
VS = 5V AV = 1
2s/DIV
15V Large-Signal Response
OUTPUT STEP (V)
5V/DIV
5V/DIV
VS = 15V AV = 1
5s/DIV
UW
100
1492/93 G19
Output Impedance vs Frequency
1000 VS = 2.5V
5V Small-Signal Response
100
500ns/DIV
1492/93 G21
125
0.1 10k
100k 1M FREQUENCY (Hz)
5V Large-Signal Response
15V Small-Signal Response
1492/93 G22
VS = 5V AV = - 1 RF = RG = 2k
2s/DIV
1492/93 G23
VS = 15V AV = 1
500ns/DIV
1492/93 G24
15V Large-Signal Response
10 8 6 4 2 0 -2 -4 -6
Settling Time to 1mV vs Output Step
VS = 15V
INVERTING NONINVERTING
1492/93 G25
VS = 15V AV = - 1 RF = RG = 2k
5s/DIV
1492/93 G26
-8 -10 0
NONINVERTING
INVERTING
1
3 4 2 SETTLING TIME (s)
5
6
1492/93 G27
9
LT1492/LT1493 TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Temperature
0.65
SUPPLY CURRENT PER AMPLIFIER (mA)
SUPPLY CURRENT PER AMPLIFIER (mA)
0.55 VS = 15V 0.45 VS = 5V, 0V 0.35
0.8
CHANGE IN OFFSET VOLTAGE (V)
0.25 - 50 - 25
0
50 75 25 TEMPERATURE (C)
Input Bias Current vs Temperature
65 60 VS = 5V, 0V
INPUT BIAS CURRENT (nA)
INPUT BIAS CURRENT (nA)
55 50 IOS 45 + IB 40 35 30 - 50 - 25 - IB
- 40 - 60 - 80 -100 -120 -140 -160 -180 - 200 - 220 TA = 25C TA = 125C TA = - 55C
COMMON MODE RANGE (V)
50 25 75 0 TEMPERATURE (C)
Input Noise Current, Noise Voltage Density vs Frequency
20
INPUT NOISE VOLTAGE DENSITY (nV/Hz)
COMMON MODE REJECTION RATIO (dB)
18 16 14 12 10 8 6 4 2 0 10 100 1k FREQUENCY (Hz) CURRENT NOISE VOLTAGE NOISE
1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2
POWER SUPPLY REJECTION RATIO (dB)
10
UW
100
1492/93 G28
Supply Current vs Supply Voltage
1.0 10 8 6 4 2 0 -2 -4 -6 -8 0 0 1 2 3 4 SUPPLY VOLTAGE (V) -10 5
1492/93 G29
Warm-Up Drift vs Time
N8 PACKAGE RL =
0.6
TA = 125C TA = 25C TA = - 55C
VS = 2.5V VS = 15V
0.4
0.2
125
0
10 20 30 40 50 60 70 80 90 100 TIME (SEC)
1492/93 G30
Input Bias Current vs Common Mode Voltage
20 0 - 20 VS = 5V, 0V
Common Mode Range vs Temperature
V+
V+ - 1
V+ - 2 V- + 2
V-
100
125
-1
0 2 3 1 COMMON MODE VOLTAGE (V)
4
1492/93 G32
V- - 1 - 50
- 25
25 50 75 0 TEMPERATURE (C)
100
125
1492/93 G31
1492/93 G33
Common Mode Rejection Ratio vs Frequency
2.0
INPUT NOISE CURRENT DENSITY (pA/Hz)
Input Referred Power Supply Rejection Ratio vs Frequency
120 VS = 15V AV = 100
VS = 15V TA = 25C
100
VS = 2.5V
80
100
60
80
40
60
POSITIVE SUPPLY
20
40
NEGATIVE SUPPLY
0 10k
1492/93 G34
0 10k
20
100k 1M FREQUENCY (Hz)
10M
1492/93 G35
1k
10k
100k 1M FREQUENCY (Hz)
10M
1492/93 G26
LT1492/LT1493
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 0.01F) within an inch of the pin. When driving heavy loads and for good settling time, an additional 4.7F 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 * 130C/W) LT1492CS8: TJ = TA + (PD * 190C/W) LT1493CS: TJ = TA + (PD * 150C/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 70C, VS = 15V, RL = 1k PDMAX = (30V)(930A) + (7.5V)2/1k = 84.2mW TJMAX = 70C + (4 * 84.2mW)(150C/W) = 121C 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
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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 100 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 10A. 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
APPLICATIONS INFORMATION
Feedback Components 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. Capacitive Loading 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.
Maximum Capacitive Load vs Load Current
10000
MAXIMUM CAPACITIVE LOAD (pF)
OUTPUT (V)
INPUT (mV)
SOURCING SINKING VS = 2.5V
1000 VS = 15V 4 OUTPUT (V) 100 VS = 2.5V VS = 15V 10 0.1 INPUT (mV) 1 10 LOAD CURRENT (mA) 100
1492/93 AI01
12
U
W
U
U
Comparator Applications 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
4
2
0 100 0 VS = 5V RL = 20s/DIV
1492/93 AI02
Comparator Response (-) 20mV, 10mV, 5mV, 2mV Overdrives
2
0 100 0 VS = 5V RL = 20s/DIV
1492/93 AI02
LT1492/LT1493
SI PLIFIED SCHE ATIC
V+ I1 I2 I3 I4 I5 I6
-IN Q1 Q7 Q2
Q8 Q9 CI Q5 Q6
TYPICAL APPLICATIONS
1A Voltage-Controlled Current Source
V+ 1 1k 1k 1k VIN 200pF 100 Si9430DY P-CHANNEL IOUT V IOUT = IN 1 tr < 1s RL
1492/93 TA05
-
1/2 LT1492
+
1k
U
W
W
CM Q3 Q4 +IN Q11 RF CF Q10 Q12
BIAS
Q13 Q14 Q15
OUT
Q16 I7 CO
I8
V-
1492/93 SS
1A Voltage-Controlled Current Sink
V+ V+ VIN RL IOUT 100 Si9410DY N-CHANNEL
+
1/2 LT1492
-
100pF 1k V IOUT = IN 1 tr < 1s 1
1492/93 TA06
Ground Current Sense Amplifier
V+ 5V LOAD 0.1F
+
1/2 LT1492 IIN 0.05 VO = 1V/A OFFSET 3.6mA BANDWIDTH = 250kHz t r = 1s
-
1910 100 100pF
1492/93 TA07
13
LT1492/LT1493
PACKAGE DESCRIPTION
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381)
(
+0.025 0.325 -0.015 8.255 +0.635 -0.381
)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 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
U
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
0.255 0.015* (6.477 0.381)
1
2
3
4 0.130 0.005 (3.302 0.127)
0.045 - 0.065 (1.143 - 1.651)
0.065 (1.651) TYP 0.005 (0.127) MIN 0.100 0.010 (2.540 0.254) 0.125 (3.175) MIN 0.018 0.003 (0.457 0.076) 0.015 (0.380) MIN
N8 0695
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
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1
2
3
4
0.053 - 0.069 (1.346 - 1.752)
0.004 - 0.010 (0.101 - 0.254)
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) TYP
SO8 0996
LT1492/LT1493
PACKAGE DESCRIPTION U
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
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1 0.010 - 0.020 x 45 (0.254 - 0.508)
0.008 - 0.010 (0.203 - 0.254) 0 - 8 TYP
2
3
4
5
6
7
8
0.053 - 0.069 (1.346 - 1.752)
0.004 - 0.010 (0.101 - 0.254)
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
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) TYP
S16 0695
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
TYPICAL APPLICATION
Single Supply 100kHz 4th Order Butterworth Filter
10
6.81k 6.81k VIN 330pF 11.3k
100pF 5.23k 47pF
-
1/2 LT1492
+
V +/2
1000pF
1/2 LT1492
VOUT
GAIN (dB)
RELATED PARTS
PART NUMBER LTC 1152 LT1211/LT1212 LT1213/LT1214 LT1215/LT1216 LT1366/LT1367 LT1490/LT1491 LT1498/LT1499
(R)
DESCRIPTION Rail-to-Rail Input and Output, Zero-Drift Op Amp Dual/Quad 14MHz, 7V/ s, Single Supply Precision Op Amps Dual/Quad 28MHz, 12V/ s, Single Supply Precision Op Amps Dual/Quad 23MHz, 50V/ s, Single Supply Precision Op Amps Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps Dual/Quad Micropower, Rail-to-Rail Input and Output Op Amps Dual/Quad Rail-to-Rail Input and Output Precision C-Load Op Amps
TM
C-Load is a trademark of Linear Technology Corporation.
16
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 q (408) 432-1900 FAX: (408) 434-0507 q TELEX: 499-3977 q www.linear-tech.com
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Frequency Response
0
V+
-10 -20 -30 -40 -50 -60 -70 -80 -90 100 1k 10k 100k FREQUENCY (Hz) 1M 10M
5.23k
10.2k
- +
1492/93 TA03
1492/93 TA04
COMMENTS High DC Accuracy, 10 V VOS(MAX) , 100nV/ C Drift, 1MHz GBW, 1V/ s Slew Rate, Max Supply Current 2.2mA Input Common Mode Includes Ground, 275 V VOS(MAX) , 6V/C Max Drift, Max Supply Current 1.8mA per Amplifier Input Common Mode Includes Ground, 275 V VOS(MAX) , 6V/C Max Drift, Max Supply Current 3.5mA per Amplifier Input Common Mode Includes Ground, 450 Max Supply Current 6.6mA per Amplifier V VOS(MAX) ,
475 V VOS(MAX) , 400kHz GBW, 0.13V/ s Slew Rate, Max Supply Current 520 A per Amplifier Max Supply Current 50 A per Amplifier, 200kHz GBW, 0.07V/ s Slew Rate, Operates with Inputs 44V Above V - Independent of V + 475V VOS(MAX) , 10MHz GBW, 6V/ s Slew Rate, Max Supply Current 2.2mA per Amplifier
14923f LT/TP 1097 4K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1997

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