Datasheet

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LT1178/LT1179

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The LT

1178 is a micropower dual op amp in the standard

8-pin configuration; the LT1179 is a micropower quad op

amp offered in the standard 14-pin packages. Both

devices are optimized for single supply operation at 5V.

Specifications are also provided at ±15V supplies.

The extremely low supply current is combined with true

precision specifications: offset voltage is 30µV, offset

current is 50pA. Both offset parameters have low drift with

temperature. The 1.5pAp-p current noise and picoampere

offset current permit the use of megaohm level source

resistors without introducing serious errors. Voltage noise,

at 0.9µVp-p, is remarkably low considering the low

supply current.

Both the LT1178 and LT1179 can be operated from a

single supply (as low as one lithium cell or two NiCd

batteries). The input range goes below ground. The

all-NPN output stage swings to within a few millivolts of

ground while sinking current—no power consuming pull

down resistors are needed.

For applications where three times higher supply

current is acceptable, the micropower LT1077 single,

LT1078 dual and LT1079 quad are recommended. The

LT1077/78/79 have significantly higher bandwidth, slew

rate, lower voltage noise and better output drive capability.

■

17µA Max Supply Current per Amplifier

■

70µV Max Offset Voltage

■

250pA Max Offset Current

■

5nA Max Input Bias Current

■

0.9µV

P-P

0.1Hz to 10Hz Voltage Noise

■

1.5pA

P-P

0.1Hz to 10Hz Current Noise

■

0.5µV/°C Offset Voltage Drift

■

85kHz Gain-Bandwidth Product

■

0.04V/µs Slew Rate

■

Single Supply Operation:

Input Voltage Range Includes Ground

Output Swings to Ground While Sinking Current

No Pull Down Resistors are Needed

■

Output Sources and Sinks 5mA Load Current

17µA Max, Dual and Quad,

Single Supply, Precision Op Amps

Self-Buffered, Dual Output, Micropower Reference Supply Current vs Temperature

■

Battery or Solar Powered Systems

Portable Instrumentation

Remote Sensor Amplifier

Satellite Circuitry

■

Micropower Sample-and-Hold

■

Thermocouple Amplifier

■

Micropower Filters

TEMPERATURE (°C)

–50

SUPPLY CURRENT PER AMPLIFIER (µA)

–25

25 50

LT1178/LT1179 • TA02

100

= ±15V

= 5V, 0V

= ±1.5V

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

–

1M* 1M*

250k*

0.1µF

LT1004-1.2

1/2 LT1178

4V TO 9V

1.2365V

OUTPUT

2.470V

OUTPUT

TOTAL BATTERY CURRENT

OUTPUT ACCURACY

TEMPERATURE COEFFICIENT

LOAD REGULATION

LINE REGULATION

= 28µA

= ± 0.4% MAX

= 20ppm/°C

= 25ppm/mA, I

≤ 5mA, V

≥ 5V

= 10ppm/V

= 0.1% FILM RESISTORS

LT1178/LT1179 • TA01

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

Summary of content (12 pages)

PAGE 1
LT1178/LT1179 17µA Max, Dual and Quad, Single Supply, Precision Op Amps U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO 17µA Max Supply Current per Amplifier 70µV Max Offset Voltage 250pA Max Offset Current 5nA Max Input Bias Current 0.9µVP-P 0.1Hz to 10Hz Voltage Noise 1.5pAP-P 0.1Hz to 10Hz Current Noise 0.5µV/°C Offset Voltage Drift 85kHz Gain-Bandwidth Product 0.
PAGE 2
LT1178/LT1179 W W W AXI U U ABSOLUTE RATI GS (Note 1) Supply Voltage ...................................................... ±22V Differential Input Voltage ....................................... ±30V Input Voltage ............... Equal to Positive Supply Voltage Input Voltage ............5V Below Negative Supply Voltage Output Short-Circuit Duration .......................... Indefinite Operating Temperature Range LT1178I/LT1179I ..................................
PAGE 3
LT1178/LT1179 ELECTRICAL CHARACTERISTICS LT1178AC/LT1179AC MIN TYP MAX LT1178I/C/S/LT1179I/C/S MIN TYP MAX 3 5 3 0.1Hz to 10Hz (Note 3) 0.9 2.0 0.9 µVP-P Input Noise Voltage Density fO = 10Hz (Note 3) fO = 1000Hz (Note 3) 50 49 75 65 50 49 nV/√Hz nV/√Hz Input Noise Current 0.1Hz to 10Hz (Note 3) 1.5 2.5 1.5 pAp-p Input Noise Current Density fO = 10Hz (Note 3) fO = 1000Hz 0.03 0.01 0.07 0.03 0.
PAGE 4
LT1178/LT1179 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C for I grades, 0°C ≤ TA ≤ 70°C for SW grades, VS = 5V, 0V; VCM = 0.1V, VO = 1.4V, unless noted. (Note 7) LT1178I/LT1179I MIN TYP MAX LT1178SW/LT1179SW MIN TYP MAX ● ● 80 80 315 345 120 130 650 800 µV µV ● 0.6 3.0 0.8 4.5 µV/°C Input Offset Current ● 0.07 0.7 0.06 0.
PAGE 5
LT1178/LT1179 ELECTRICAL CHARACTERISTICS VS = ±15V, TA = 25°C, unless noted. SYMBOL PARAMETER VOS Input Offset Voltage CONDITIONS LT1178AC/LT1179AC MIN TYP MAX LT1178I/C/S/LT1179I/C/S MIN TYP MAX 80 350 100 150 160 120 480 900 1050 350 LT1178SW LT1179SW LT1178S8 UNITS µV µV µV µV IOS lnput Offset Current 0.05 0.25 0.05 0.35 nA IB Input Bias Current 3 5 3 6 nA Input Voltage Range 13.5 –15.0 13.9 –15.3 13.5 –15.0 13.9 –15.3 V V CMRR Common Mode Rejection Ratio VCM = 13.
PAGE 6
LT1178/LT1179 ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating tempera- ture range of 0°C ≤ TA ≤ 70°C, VS = ±15V, unless noted. SYMBOL PARAMETER VOS lnput Offset Voltage CONDITIONS LT1178AC/LT1179AC MIN TYP MAX LT1178C/S8/LT1179C MIN TYP MAX UNITS ● ● 100 480 LT1178S8 130 150 660 540 µV µV (Note 6) LT1178S8 ● ● 0.6 2.8 0.7 0.7 4.0 3.8 µV/°C µV/°C ● 0.06 0.35 0.06 0.
PAGE 7
LT1178/LT1179 U W TYPICAL PERFOR A CE CHARACTERISTICS 1000 VS = 5V, 0V SATURATION VOLTAGE (mV) 75 IOS 50 25 INPUT BIAS CURRENT (nA) –2.5 IB –3.0 VS = 5V, 0V ISINK = 1mA ISINK = 100µA 100 ISINK = 1µA 10 NO LOAD 10k TO GROUND 1 –3.5 2k TO GROUND – 4.0 –50 –25 50 25 0 TEMPERATURE (°C) 75 0.1 –50 100 –25 50 25 0 TEMPERATURE (°C) CHANNEL B 10 12 0 20 80 40 60 TIME (SECONDS) LT1178/LT1179 • TPC07 TA = 25°C 40 VS = 5V, 0V VOLTAGE GAIN (dB) VS = ±15V 1/f CORNER 0.
PAGE 8
LT1178/LT1179 U W TYPICAL PERFOR A CE CHARACTERISTICS Large-Signal Transient Response VS = ±15V Capacitive Load Handling Large-Signal Transient Response VS = 5V, 0V 120 VS = 5V, 0V AV = 1 80 1V/DIV OVERSHOOT (%) 100 60 40 20 AV = 5 AV = 1 CL = 12pF AV = 10 500µs/DIV AV = 1 100µs/DIV CL = 12pF INPUT PULSE = 0V TO 3.
PAGE 9
LT1178/LT1179 U W U U APPLICATIO S I FOR ATIO Please see the LT1078/LT1079 data sheet for applications information. All comments relating to specifications, single supply operation and phase reversal protection are directly applicable to the LT1178/LT1179. Micropower 100Hz to 1MHz V-to-F Converter 7V TO 10V 1.5M VIN 0V TO 5V 100k 220k* 50k 1MHz TRIM 1N4148 100Hz TRIM 240k TYPICAL + 100Ω + NC A2 1/2 LT1178 + 1µF 10k LT1004– 2.
PAGE 10
LT1178/LT1179 U PACKAGE DESCRIPTIO H Package 8-Lead TO-5 Metal Can (.230 Inch PCD) (Reference LTC DWG # 05-08-1321) .016 – .021** (0.406 – 0.533) .027 – .045 (0.686 – 1.143) .335 – .370 (8.509 – 9.398) DIA .305 – .335 (7.747 – 8.509) .040 (1.016) MAX 45°TYP .050 (1.270) MAX SEATING PLANE PIN 1 .028 – .034 (0.711 – 0.864) .230 (5.842) TYP .165 – .185 (4.191 – 4.699) GAUGE PLANE .010 – .045* (0.254 – 1.143) REFERENCE PLANE .500 – .750 (12.700 – 19.050) .110 – .160 (2.794 – 4.
PAGE 11
LT1178/LT1179 U PACKAGE DESCRIPTIO N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 ± .015* (6.477 ± 0.381) .300 – .325 (7.620 – 8.255) .065 (1.651) TYP .008 – .015 (0.203 – 0.381) +.035 .325 –.015 ( 8.255 +0.889 –0.381 .130 ± .005 (3.302 ± 0.127) .045 – .065 (1.143 – 1.651) .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 (0.457 ± 0.076) .100 (2.54) BSC ) N8 1002 NOTE: 1.
PAGE 12
LT1178/LT1179 U PACKAGE DESCRIPTIO 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 ±.005 .050 BSC 7 8 5 6 N N .245 MIN .160 ±.005 1 .030 ±.005 TYP .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT 1 .010 – .020 × 45° (0.254 – 0.508) 3 2 4 .053 – .069 (1.346 – 1.752) .008 – .010 (0.203 – 0.254) .004 – .010 (0.101 – 0.254) 0°– 8° TYP .016 – .