Datasheet

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LT1167

Single Resistor Gain

Programmable, Precision

Instrumentation Amplifier

Gain Nonlinearity

The LT

1167 is a low power, precision instrumentation

amplifier that requires only one external resistor to set gains

of 1 to 10,000. The low voltage noise of 7.5nV/√Hz (at 1kHz)

is not compromised by low power dissipation (0.9mA typical

for ±2.3V to ±15V supplies).

The part’s high accuracy (10ppm maximum nonlinearity,

0.08% max gain error (G = 10)) is not degraded even for load

resistors as low as 2k (previous monolithic instrumentation

amps used 10k for their nonlinearity specifications). The

LT1167 is laser trimmed for very low input offset voltage

(40µV max), drift (0.3µV/°C), high CMRR (90dB, G = 1) and

PSRR (105dB, G = 1). Low input bias currents of 350pA max

are achieved with the use of superbeta processing. The

output can handle capacitive loads up to 1000pF in any gain

configuration while the inputs are ESD protected up to 13kV

(human body). The LT1167 with two external 5k resistors

passes the IEC 1000-4-2 level 4 specification.

The LT1167, offered in 8-pin PDIP and SO packages, requires

significantly less PC board area than discrete multi op amp

and resistor designs. These advantages make the LT1167 the

most cost effective solution for precision instrumentation

amplifier applications.

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Single Gain Set Resistor: G = 1 to 10,000

■

Gain Error: G = 10, 0.08% Max

■

Input Offset Voltage Drift: 0.3

C Max

■

Meets IEC 1000-4-2 Level 4 ESD Tests with

Two External 5k Resistors

■

Gain Nonlinearity: G = 10, 10ppm Max

■

Input Offset Voltage: G = 10, 60µV Max

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Input Bias Current: 350pA Max

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PSRR at G = 1: 105dB Min

■

CMRR at G = 1: 90dB Min

■

Supply Current: 1.3mA Max

■

Wide Supply Range: ±2.3V to ±18V

■

1kHz Voltage Noise: 7.5nV/√Hz

■

0.1Hz to 10Hz Noise: 0.28µV

P-P

■

Available in 8-Pin PDIP and SO Packages

, LTC and LT are registered trademarks of Linear Technology Corporation.

■

Bridge Amplifiers

■

Strain Gauge Amplifiers

■

Thermocouple Amplifiers

■

Differential to Single-Ended Converters

■

Medical Instrumentation

–

392k

50k

OFFSET

ADJUST

50k

100k

LT1634CCZ-1.25

1/2

LT1490

SET

0.2% ACCURACY AT 25°C

1.2% ACCURACY AT 0°C TO 60°C

= 8V TO 30V

–

1/2

LT1490

LUCAS NOVA SENOR

NPC-1220-015-A-3L

1167 TA01

4-DIGIT

DVM

12Ω

LT1167

G = 60

825Ω

50k

VOLTS

2.800

3.000

3.200

INCHES Hg

28.00

30.00

32.00

Single Supply Barometer

G = 1000

= 1k

OUT

= ±10V

1167 TA02

OUTPUT VOLTAGE (2V/DIV)

NONLINEARITY (100ppm/DIV)

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

Summary of content (20 pages)

PAGE 1
LT1167 Single Resistor Gain Programmable, Precision Instrumentation Amplifier U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO The LT ®1167 is a low power, precision instrumentation amplifier that requires only one external resistor to set gains of 1 to 10,000. The low voltage noise of 7.5nV/√Hz (at 1kHz) is not compromised by low power dissipation (0.9mA typical for ±2.3V to ±15V supplies). The part’s high accuracy (10ppm maximum nonlinearity, 0.
PAGE 2
LT1167 W W W AXI U U ABSOLUTE RATI GS U U W PACKAGE/ORDER I FOR ATIO (Note 1) Supply Voltage ...................................................... ±20V Differential Input Voltage (Within the Supply Voltage) ..................................................... ±40V Input Voltage (Equal to Supply Voltage) ................ ±20V Input Current (Note 3) ........................................ ±20mA Output Short-Circuit Duration .......................... Indefinite Operating Temperature Range ........
PAGE 3
LT1167 ELECTRICAL CHARACTERISTICS VS = ±15V, VCM = 0V, TA = 25°C, RL = 2k, unless otherwise noted. LT1167AC/LT1167AI MIN TYP MAX LT1167C/LT1167I MIN TYP MAX UNITS fO = 0.1Hz to 10Hz 10 10 pAP-P Input Noise Current Density fO = 10Hz 124 124 fA/√Hz RIN Input Resistance VIN = ±10V 1000 GΩ CIN(DIFF) Differential Input Capacitance fO = 100kHz 1.6 1.6 pF CIN(CM) Common Mode Input Capacitance fO = 100kHz 1.6 1.6 pF VCM Input Voltage Range G = 1, Other Input Grounded VS = ±2.
PAGE 4
LT1167 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, 0°C ≤ TA ≤ 70°C, RL = 2k, unless otherwise noted. SYMBOL PARAMETER CONDITIONS (Note 7) MIN LT1167AC TYP MAX MIN LT1167C TYP MAX UNITS Gain Error G=1 G = 10 (Note 2) G = 100 (Note 2) G = 1000 (Note 2) ● ● ● ● 0.01 0.08 0.09 0.14 0.03 0.30 0.30 0.33 0.012 0.100 0.120 0.140 0.04 0.33 0.33 0.
PAGE 5
LT1167 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, – 40°C ≤ TA ≤ 85°C, RL = 2k, unless otherwise noted. (Note 4) SYMBOL PARAMETER CONDITIONS (Note 7) MIN LT1167AI TYP MAX MIN LT1167I TYP MAX UNITS Gain Error G=1 G = 10 (Note 2) G = 100 (Note 2) G = 1000 (Note 2) ● ● ● ● 0.014 0.130 0.140 0.160 0.04 0.40 0.40 0.40 0.015 0.140 0.150 0.180 0.05 0.42 0.42 0.
PAGE 6
LT1167 U W TYPICAL PERFOR A CE CHARACTERISTICS Gain Nonlinearity, G = 100 NONLINEARITY (1ppm/DIV) 1167 G01 Gain Nonlinearity, G = 1000 NONLINEARITY (100ppm/DIV) NONLINEARITY (ppm) 70 1167 G03 G = 100 OUTPUT VOLTAGE (2V/DIV) RL = 2k VOUT = ±10V Gain Error vs Temperature Gain Nonlinearity vs Temperature 80 G = 1000 OUTPUT VOLTAGE (2V/DIV) RL = 2k VOUT = ±10V 1167 G02 OUTPUT VOLTAGE (2V/DIV) G = 10 RL = 2k VOUT = ±10V 0.20 VS = ± 15V VOUT = – 10V TO 10V RL = 2k 0.15 0.
PAGE 7
LT1167 U W TYPICAL PERFOR A CE CHARACTERISTICS Distribution of Output Offset Voltage, TA = – 40°C 30 VS = ±15V G=1 137 N8 (2 LOTS) 165 S8 (3 LOTS) 25 302 TOTAL PARTS PERCENT OF UNITS (%) PERCENT OF UNITS (%) 137 N8 (2 LOTS) 35 165 S8 (3 LOTS) 302 TOTAL PARTS 30 25 20 15 10 Distribution of Output Offset Voltage, TA = 85°C 40 VS = ±15V G=1 20 15 10 5 0 Distribution of Input Offset Voltage Drift 15 10 VS = ±15V TA = – 40°C TO 85°C G=1 35 5 137 N8 (2 LOTS) 165 S8 (3 LOTS) 302 TOTAL PARTS 30 25 20
PAGE 8
LT1167 U W TYPICAL PERFOR A CE CHARACTERISTICS COMMON MODE REJECTION RATIO (dB) 160 INPUT BIAS CURRENT (pA) 400 300 200 100 70°C 85°C –100 – 200 0°C – 300 – 40°C 25°C – 400 140 G = 100 120 G = 10 100 G=1 80 60 40 20 0 0.
PAGE 9
LT1167 U W TYPICAL PERFOR A CE CHARACTERISTICS Current Noise Density vs Frequency 0.
PAGE 10
LT1167 U W TYPICAL PERFOR A CE CHARACTERISTICS Undistorted Output Swing vs Frequency Small-Signal Transient Response Large-Signal Transient Response VS = ± 15V TA = 25°C 5V/DIV 30 G = 10, 100, 1000 G=1 25 20mV/DIV PEAK-TO-PEAK OUTPUT SWING (V) 35 20 15 10 5 0 10 100 FREQUENCY (kHz) 1 1000 1167 G34 10µs/DIV G = 100 VS = ±15V RL = 2k CL = 60pF G = 100 VS = ±15V RL = 2k CL = 60pF 10µs/DIV 1167 G35 1167 G27 Settling Time vs Gain Large-Signal Transient Response Small-Signal Transient Respon
PAGE 11
LT1167 W BLOCK DIAGRA V+ VB R5 10k + R6 10k 6 OUTPUT A1 – R3 400Ω –IN C1 2 Q1 R1 24.7k – V– + A3 RG 1 RG 8 V– VB V+ + R7 10k R8 10k 5 REF A2 – R4 400Ω +IN 3 C2 V– Q2 R2 24.7k 7 V+ 4 V– V– PREAMP STAGE DIFFERENCE AMPLIFIER STAGE 1167 F01 Figure 1. Block Diagram U THEORY OF OPERATIO The LT1167 is a modified version of the three op amp instrumentation amplifier.
PAGE 12
LT1167 U THEORY OF OPERATIO Input and Output Offset Voltage Output Offset Trimming The offset voltage of the LT1167 has two components: the output offset and the input offset. The total offset voltage referred to the input (RTI) is found by dividing the output offset by the programmed gain (G) and adding it to the input offset. At high gains the input offset voltage dominates, whereas at low gains the output offset voltage dominates.
PAGE 13
LT1167 U THEORY OF OPERATIO – THERMOCOUPLE RG – MICROPHONE, HYDROPHONE, ETC LT1167 RG + – LT1167 + 200k 10k RG LT1167 + 200k CENTER-TAP PROVIDES BIAS CURRENT RETURN 1167 F03 Figure 3. Providing an Input Common Mode Current Path U W U U APPLICATIO S I FOR ATIO The LT1167 is a low power precision instrumentation amplifier that requires only one external resistor to accurately set the gain anywhere from 1 to 1000.
PAGE 14
LT1167 U W U U APPLICATIO S I FOR ATIO To significantly reduce the effect of these out-of-band signals on the input offset voltage of instrumentation amplifiers, simple lowpass filters can be used at the inputs. These filters should be located very close to the input pins of the circuit. An effective filter configuration is illustrated in Figure 5, where three capacitors have been added to the inputs of the LT1167.
PAGE 15
LT1167 U W U U APPLICATIO S I FOR ATIO + + 10V 350Ω – 10k** – 10k** + 350Ω RG 499Ω 350Ω 10k* 10k* 1/4 LT1114A LT1167C 202Ω** REF 350Ω – PRECISION BRIDGE TRANSDUCER 1/4 LT1114A – 1/4 LT1114A 10k* 10k* + LT1167 MONOLITHIC INSTRUMENTATION AMPLIFIER G = 100, RG = ±10ppm TC SUPPLY CURRENT = 1.3mA MAX “ROLL YOUR OWN” INST AMP, G = 100 * 0.02% RESISTOR MATCH, 3ppm/°C TRACKING ** DISCRETE 1% RESISTOR, ±100ppm/°C TC 100ppm TRACKING SUPPLY CURRENT = 1.
PAGE 16
LT1167 U W U U APPLICATIO S I FOR ATIO 8 VS + RG LT1167 2 REF VX 5 – 4 –V S 1 1/2 LT1464 + V [(+IN) – (–IN)]G IL = X = RX RX G= RX 6 1 –IN important, R6 and C2 make up a 0.3Hz highpass filter. The AC signal at LT1112’s Pin 5 is amplified by a gain of 101 set by (R7/R8) +1. The parallel combination of C3 and R7 form a lowpass filter that decreases this gain at frequencies above 1kHz. The ability to operate at ±3V on 0.
PAGE 17
LT1167 U W U U APPLICATIO S I FOR ATIO BI TECHNOLOGIES 67-8-3 R40KQ (0.02% RATIO MATCH) 5V 1 3 8 3.5k + 40k 7 3.5k REF G = 200 249Ω 3.5k 6 LT1167 3.5k 1 2 IN 5 – ADC LTC®1286 20k 3 4 + 2 1 1/2 LT1112 40k DIGITAL DATA OUTPUT AGND – 1167 F09 Figure 9. Single Supply Bridge Amplifier U TYPICAL APPLICATIO AC Coupled Instrumentation Amplifier 1 – RG 8 REF 3 5 + OUTPUT R1 500k C1 0.3µF – +IN 6 LT1167 1 1/2 LT1112 + 2 –IN 2 3 f –3dB = 1 (2π)(R1)(C1) = 1.
PAGE 18
LT1167 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) 0.009 – 0.015 (0.229 – 0.381) ( +0.035 0.325 –0.015 8.255 +0.889 –0.381 ) 0.045 – 0.065 (1.143 – 1.651) 0.065 (1.651) TYP 0.100 (2.54) BSC *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.
PAGE 19
LT1167 U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. 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) 0.014 – 0.019 (0.355 – 0.483) TYP *DIMENSION DOES NOT INCLUDE MOLD FLASH.
PAGE 20
LT1167 U TYPICAL APPLICATIO 4-Digit Pressure Sensor 9V R8 392k 3 + 2 2 1 1/4 LT1114 1 LT1634CCZ-1.25 LUCAS NOVA SENOR NPC-1220-015A-3L 4 – 11 – 4 5k R9 1k 2 9V R1 825Ω + RSET 7 6 LT1167 G = 60 R2 12Ω 5k 6 – 1 5k 5k 2 1 8 5 3 3 + 4 10 + 12 0.2% ACCURACY AT ROOM TEMP 1.2% ACCURACY AT 0°C TO 60°C VOLTS 2.800 3.000 3.200 INCHES Hg 28.00 30.00 32.