Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsLinear ICsLinear IC - In-amp InAmp SO 8

LT1167

1167fc

TYPICAL APPLICATION

FEATURES DESCRIPTION

Single Resistor Gain

Programmable, Precision

Instrumentation Amplifier

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. 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, re-

quires significantly less PC board area than discrete multi

op amp and resistor designs.

The LT1167-1 offers the same performance as the LT1167,

but its input current characteristic at high common mode

voltage better supports applications with high input imped-

ance (see the Applications Information section).

Single Supply Barometer

APPLICATIONS

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

Gain Error: G = 10, 0.08% Max

Input Offset Voltage Drift: 0.3μV/°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

Input Bias Current: 350pA Max

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

Bridge Amplifiers

■

Strain Gauge Ampliﬁ ers

■

Thermocouple Ampliﬁ ers

■

Differential to Single-Ended Converters

■

Medical Instrumentation

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

–

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

OUTPUT VOLTAGE (2V/DIV)

NONLINEARITY (100ppm/DIV)

1167 TA02

G = 1000

= 1k

OUT

= ±10V

Gain Nonlinearity

Summary of content (22 pages)

PAGE 1
LT1167 Single Resistor Gain Programmable, Precision Instrumentation Amplifier DESCRIPTION FEATURES n n n n n n n n n n n n n n Single Gain Set Resistor: G = 1 to 10,000 Gain Error: G = 10, 0.08% Max Input Offset Voltage Drift: 0.3μV/°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 Input Bias Current: 350pA Max PSRR at G = 1: 105dB Min CMRR at G = 1: 90dB Min Supply Current: 1.
PAGE 2
LT1167 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (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. SYMBOL PARAMETER CONDITIONS (NOTE 7) G Gain Range G = 1 + (49.4k/RG) Gain Error G=1 G = 10 (Note 2) G = 100 (Note 2) G = 1000 (Note 2) Gain Nonlinearity (Note 5) LT1167AC/LTC1167AI LT1167AC-1/LTC1167AI-1 MIN TYP MAX 1 10k LT1167C/LTC1167I LT1167C-1/LTC1167I-1 MIN TYP MAX 1 UNITS 10k 0.008 0.010 0.025 0.049 0.02 0.08 0.08 0.10 0.015 0.020 0.030 0.040 0.03 0.10 0.10 0.
PAGE 4
LT1167 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER Output Current BW Bandwidth G=1 G = 10 G = 100 G = 1000 Slew Rate G = 1, VOUT = ±10V Settling Time to 0.01% 10V Step G = 1 to 100 G = 1000 RREFIN Reference Input Resistance IREFIN Reference Input Current VREF Reference Voltage Range AVREF Reference Gain to Output LT1167AC/LTC1167AI LT1167AC-1/LTC1167AI-1 MIN TYP MAX CONDITIONS (NOTE 7) IOUT SR VS = ±15V, VCM = 0V, TA = 25°C, RL = 2k, unless otherwise noted.
PAGE 5
LT1167 ELECTRICAL CHARACTERISTICS The l denotes the 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) PSRR VS = ±2.3V to ±18V G=1 G = 10 G = 100 G = 1000 l l l l Power Supply Rejection Ratio IS Supply Current VS = ±2.3V to ±18V l VOUT Output Voltage Swing RL = 10k VS = ±2.
PAGE 6
LT1167 ELECTRICAL CHARACTERISTICS The l denotes the 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) PSRR VS = ±2.
PAGE 7
LT1167 TYPICAL PERFORMANCE CHARACTERISTICS Gain Nonlinearity, G = 100 NONLINEARITY (10ppm/DIV) Gain Nonlinearity, G = 10 NONLINEARITY (1ppm/DIV) NONLINEARITY (10ppm/DIV) Gain Nonlinearity, G = 1 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 Nonlinearity vs Temperature 80 G = 1000 OUTPUT VOLTAGE (2V/DIV) RL = 2k VOUT = ±10V 1167 G02 G = 10 OUTPUT VOLTAGE (2V/DIV) RL = 2k VOUT = ±10V Gain Er
PAGE 8
LT1167 TYPICAL PERFORMANCE CHARACTERISTICS Distribution of Output Offset Voltage, TA = – 40°C 30 30 25 20 15 10 40 VS = ±15V G=1 137 N8 (2 LOTS) 165 S8 (3 LOTS) 25 302 TOTAL PARTS VS = ±15V G=1 PERCENT OF UNITS (%) 137 N8 (2 LOTS) 35 165 S8 (3 LOTS) 302 TOTAL PARTS Distribution of Output Offset Voltage, TA = 85°C 20 15 10 5 5 0 – 0.4 – 0.3 – 0.2 – 0.1 0 0.1 0.2 0.
PAGE 9
LT1167 Input Bias Current vs Common Mode Input Voltage Common Mode Rejection Ratio vs Frequency 500 COMMON MODE REJECTION RATIO (dB) 160 INPUT BIAS CURRENT (pA) 400 300 200 100 0 70°C 85°C –100 – 200 0°C – 300 – 40°C 25°C – 400 140 120 G = 100 G = 10 100 G=1 80 60 40 20 0 0.
PAGE 10
LT1167 TYPICAL PERFORMANCE CHARACTERISTICS Current Noise Density vs Frequency 0.
PAGE 11
LT1167 TYPICAL PERFORMANCE CHARACTERISTICS Undistorted Output Swing vs Frequency Large-Signal Transient Response Small-Signal Transient Response 20mV/DIV VS = ±15V TA = 25°C 30 G = 10, 100, 1000 G=1 25 5V/DIV PEAK-TO-PEAK OUTPUT SWING (V) 35 20 15 10 5 G = 100 VS = ±15V RL = 2k CL = 60pF 0 10 100 FREQUENCY (kHz) 1 1000 1167 G34 10μs/DIV 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 Response 1
PAGE 12
LT1167 BLOCK DIAGRAM 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 V– VB + 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 THEORY OF OPERATION The LT1167 is a modified version of the three op amp instrumentation amplifier.
PAGE 13
LT1167 THEORY OF OPERATION 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 14
LT1167 THEORY OF OPERATION – THERMOCOUPLE RG – LT1167 MICROPHONE, HYDROPHONE, ETC RG – RG LT1167 + + 200k 10k LT1167 + 200k CENTER-TAP PROVIDES BIAS CURRENT RETURN 1167 F03 Figure 3. Providing an Input Common Mode Current Path APPLICATIONS INFORMATION 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 15
LT1167 APPLICATIONS INFORMATION The amplitude and frequency of the interference can have an adverse effect on an instrumentation amplifier’s input stage by causing an unwanted DC shift in the amplifier’s input offset voltage. This well known effect is called RFI rectification and is produced when out-of-band interference is coupled (inductively, capacitively or via radiation) and rectified by the instrumentation amplifier’s input transistors.
PAGE 16
LT1167 APPLICATIONS INFORMATION + + 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 = 1.35mA FOR 3 AMPLIFIERS 1167 F06 Figure 6.
PAGE 17
LT1167 APPLICATIONS INFORMATION RG 7 LT1167 REF 1 2 –IN VX 5 – 4 –V S 1 1/2 LT1464 [(+IN) – (–IN)]G V IL = X = RX RX G= RX 6 + 8 high CMRR ensures that the desired differential signal is amplified and unwanted common mode signals are attenuated. Since the DC portion of the signal is not 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.
PAGE 18
LT1167 APPLICATIONS INFORMATION 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 3.5k 6 LT1167 1 IN 5 2 – ADC LTC®1286 20k 3 4 + 2 1 1/2 LT1112 40k DIGITAL DATA OUTPUT AGND – 1167 F09 Figure 9. Single Supply Bridge Amplifier TYPICAL APPLICATION AC Coupled Instrumentation Amplifier 2 –IN 1 – RG +IN 6 LT1167 8 REF 3 5 + OUTPUT R1 500k C1 0.3μF – 1 1/2 LT1112 2 3 f –3dB = 1 (2π)(R1)(C1) = 1.
PAGE 19
LT1167 PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510 Rev I) .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 t .015* (6.477 t 0.381) .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) +.035 .325 –.015 8.255 +0.889 –0.381 .045 – .065 (1.143 – 1.651) .130 t .005 (3.302 t 0.127) .065 (1.651) TYP .100 (2.54) BSC .120 (3.048) .020 MIN (0.508) MIN .
PAGE 20
LT1167 PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3 .045 p.005 .050 BSC 8 .245 MIN 7 6 5 .160 p.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) .030 p.005 TYP 1 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 s 45o (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 0o– 8o TYP .016 – .
PAGE 21
LT1167 REVISION HISTORY (Revision history begins at Rev B) REV DATE DESCRIPTION B 01/11 Added LT1167-1 to Description, Absolute Maximum Ratings, Order Information, Electrical Characteristics and Applications Information Section PAGE NUMBER C 08/11 Correction to TYP specification for SR from 12 to 1.2 Columns shifted to left in CMRR specification 1-6, 15 4 4, 5 1167fc Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
PAGE 22
LT1167 TYPICAL APPLICATION 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.