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Part: LT1991
Category:
Description: Precision, 100�A Gain Selectable Amplifier
Company: Linear Technology Corporation
Datasheet: Download LT1991 datasheet File size : 283 kB
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LT1991 Precision, 100µA Gain Selectable Amplifier
FEATURES
DESCRIPTIO
Pin Configurable as a Difference Amplifier, Inverting and Noninverting Amplifier Difference Amplifier Gain Range 1 to 13 CMRR >75dB Noninverting Amplifier Gain Range 0.07 to 14 Inverting Amplifier Gain Range 0.08 to 13 Gain Error <0.04% Gain Drift < 3ppm/°C Wide Supply Range: Single 2.7V to Split ±18V Micropower: 100µA Supply Current Precision: 50µV Maximum Input Offset Voltage 560kHz Gain Bandwidth Product Rail-to-Rail Output Space Saving 10-Lead MSOP Package
The LT®1991 combines a precision operational amplifier with eight precision resistors to form a one-chip solution for accurately amplifying voltages. Gains from 13 to 14 with a gain accuracy of 0.04% can be achieved using no external components. The device is particularly well suited for use as a difference amplifier, where the excellent resistor matching results in a common mode rejection ratio of greater than 75dB. The amplifier features a 50µV maximum input offset voltage and a gain bandwidth product of 560kHz. The device operates from any supply voltage from 2.7V to 36V and draws only 100µA supply current on a 5V supply. The output swings to within 40mV of either supply rail. The resistors have excellent matching, 0.04% over temperature for the 450k resistors. The matching temperature coefficent is guaranteed less than 3ppm/°C. The resistors are extremely linear with voltage, resulting in a gain nonlinearity of less than 10ppm. The LT1991 is fully specified at 5V and ±15V supplies and from 40°C to 85°C. The device is available in a space saving 10-lead MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation. Patent Pending.
APPLICATIO S
Handheld Instrumentation Medical Instrumentation Strain Gauge Amplifiers Differential to Single-Ended Conversion
TYPICAL APPLICATIO
Rail-to-Rail Gain = 1 Difference Amplifier
5V 50k 150k VM(IN) VIN VP(IN) 450k VOUT = VREF + VIN SWING 40mV TO EITHER RAIL ROUT <0.1 40 35
PERCENTAGE OF UNITS (%)
+
450k
450k 150k 50k
+
INPUT RANGE 0.5V TO 5.1V RIN = 900k
LT1991 450k
VREF = 2.5V
1991 TA01
U
Distribution of Resistor Matching
450k RESISTORS LT1991A 30 25 20 15 10 5 0 0.04 0 0.02 0.02 RESISTOR MATCHING (%) 0.04
1991TA01b
U
U
1991f
1
LT1991
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
ORDER PART NUMBER
TOP VIEW P1 P3 P9 VEE REF 1 2 3 4 5 10 9 8 7 6 M1 M3 M9 VCC OUT
Total Supply Voltage (V + to V ) ....... 40V Input Voltage (Pins P1/M1, Note 2) ..... ±60V Input Voltage (Other inputs Note 2)..... V + + 0.2V to V 0.2V Output Short-Circuit Duration (Note 3) ... Indefinite Operating Temperature Range (Note 4) ... 40°C to 85°C Specified Temperature Range (Note 5) .... 40°C to 85°C Maximum Junction Temperature .. 150°C Storage Temperature Range ......... 65°C to 150°C Lead Temperature (Soldering, 10 sec)......... 300°C
MS PACKAGE 10-LEAD PLASTIC MSOP TJMAX = 150°C, JA = 230°C/W
LT1991CMS LT1991IMS LT1991ACMS LT1991AIMS MS PART MARKING LTQD*
*Temperature and electrical grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Difference amplifier configuration, VS = 5V, 0V or ±15V; VCM = VREF = half supply, unless otherwise noted.
SYMBOL G PARAMETER Gain Error CONDITIONS VS = ±15V, VOUT = ±10V; RL = 10k G = 1; LT1991A G = 1; LT1991 G = 3 or 9; LT1991A G = 3 or 9; LT1991 VS = ±15V; VOUT = ±10V; RL = 10k VS = ±15V; VOUT = ±10V; RL = 10k VS = ±15V; VCM = ±15.2V G = 9; LT1991A G = 3; LT1991A G = 1; LT1991A Any Gain; LT1991 P1/M1 Inputs VS = ±15V; VREF = 0V VS = 5V, 0V; VREF = 2.5V VS = 3V, 0V; VREF = 1.25V P1/M1 Inputs, P9/M9 Connected to REF VS = ±15V; VREF = 0V VS = 5V, 0V; VREF = 2.5V VS = 3V, 0V; VREF = 1.25V P3/M3 Inputs VS = ±15V; VREF = 0V VS = 5V, 0V; VREF = 2.5V VS = 3V, 0V; VREF = 1.25V P9/M9 Inputs VS = ±15V; VREF = 0V VS = 5V, 0V; VREF = 2.5V VS = 3V, 0V; VREF = 1.25V
ELECTRICAL CHARACTERISTICS
MIN
TYP
MAX ±0.04 ±0.08 ±0.06 ±0.12
UNITS % % % % ppm ppm/°C dB dB dB dB
GNL G/T CMRR
Gain Nonlinearity Gain Drift vs Temperature (Note 6) Common Mode Rejection Ratio, Referred to Inputs (RTI)
1 0.3 80 75 75 60 28 0.5 0.75 60 14 1.5 15.2 0.5 0.95 15.2 0.85 1.0 100 93 90 70
10 3
VCM
Input Voltage Range (Note 7)
27.6 5.1 2.35 60 16.8 7.3 15.2 4.2 1.95 15.2 3.9 1.9
2
U
V V V V V V V V V V V V
1991f
W
U
U
WW
W
LT1991
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Difference amplifier configuration, VS = 5V, 0V or ±15V; VCM = VREF = half supply, unless otherwise noted.
SYMBOL V OS PARAMETER Op Amp Offset Voltage (Note 8) CONDITIONS LT1991A, VS = 5V, 0V
ELECTRICAL CHARACTERISTICS
MIN
TYP 15 15
MAX 50 130 80 160 100 200 1
UNITS µV µV µV µV µV µV µV/°C nA pA µVP-P µVRMS µVP-P µVRMS nV/Hz nV/Hz
LT1991A, VS = ±15V
LT1991
25
VOS/T IB IOS
Op Amp Offset Voltage Drift (Note 6) Op Amp Input Bias Current Op Amp Input Offset Current Op Amp Input Noise Voltage 0.01Hz to 1Hz 0.01Hz to 1Hz 0.1Hz to 10Hz 0.1Hz to 10Hz G = 1; f = 1kHz G = 9; f = 1kHz P1 (M1 = Ground) P3 (M3 = Ground) P9 (M9 = Ground) M1 (P1 = Ground) M3 (P3 = Ground) M9 (P9 = Ground)
0.3 3 50 0.35 0.07 0.25 0.05 180 46
en RIN
Input Noise Voltage Density Input Impedance (Note 10)
630 420 350 315 105 35
900 600 500 450 150 50 0.01 0.02 0.02 0.04 0.3 30
1170 780 650 585 195 65 0.04 0.06 0.08 0.12 3
k k k k k k % % % % ppm/°C ppm/°C dB V mV mV mV mV mV mV mA mA mA mA kHz k Hz k Hz kHz µs µs
1991f
R
Resistor Matching (Note 9)
450k Resistors, LT1991A Other Resistors, LT1991A 450k Resistors, LT1991 Other Resistors, LT1991 Resistor Matching Absolute Value VS = ±1.35V to ±18V (Note 8) No Load VS = 5V, 0V VS = 5V, 0V VS = ±15V 1mA Load VS = 5V, 0V VS = 5V, 0V VS = ±15V
R/T PSRR V OUT
Resistor Temperature Coefficient (Note 6) Power Supply Rejection Ratio Minimum Supply Voltage Output Voltage Swing (to Either Rail)
110
135 2.4 40 2.7 55 65 110 225 275 300
150
I SC
Output Short-Circuit Current (Sourcing) Output Short-Circuit Current (Sinking)
Drive Output Positive; Short Output to Ground Drive Output Negative; Short Output to VS or Midsupply G=1 G=3 G=9 f = 10kHz G = 1; 0.1V Step; 10% to 90% G = 9; 0.1V Step; 10% to 90%
8 4 8 4
12 21 110 78 40 560 3 8
BW
3dB Bandwidth
GBWP tr, tf
Op Amp Gain Bandwidth Product Rise Time, Fall Time
3
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