Datasheet

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LTC1151

1151fa

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

Dual ±15V Zero-Drift

Operational Amplifier

–15V

–

15V

0.1µF

1/2

LTC1151

OUTPUT A

100mV/°C

1151 TA01

240k51Ω 100Ω*

0.1µF

LT1025

15V

470k

–

GND

–

TYPE K

0.1µF

1/2

LTC1151

OUTPUT B

100mV/°C

240k

51Ω 100Ω*

0.1µF

–

TYPE K

* FULL SCALE TRIM: TRIM FOR 10.0V OUTPUT

WITH THERMOCOUPLE AT 100°C

The LTC

1151 is a high voltage, high performance dual

zero-drift operational amplifier. The two sample-and-hold

capacitors per amplifier required externally by other chop-

per amplifiers are integrated on-chip. The LTC1151 also

incorporates proprietary high voltage CMOS structures

which allow operation at up to 36V total supply voltage.

The LTC1151 has a typical offset voltage of 0.5µV,

drift of 0.01µV/°C, 0.1Hz to 10Hz input noise voltage of

1.5µV

P-P

, and a typical voltage gain of 140dB. It has a slew

rate of 3V/µs and a gain-bandwidth product of 2.5MHz

with a supply current of 0.9mA per amplifier. Overload

recovery times from positive and negative saturation are

3ms and 20ms, respectively.

The LTC1151 is available in a standard 8-lead plastic DIP

package as well as a 16-lead wide body SO. The LTC1151

is pin compatible with industry-standard dual op amps

and runs from standard ±15V supplies, allowing it to plug

in to most standard bipolar op amp sockets while offering

significant improvement in DC performance.

■

Strain Gauge Amplifiers

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Instrumentation Amplifiers

■

Electronic Scales

■

Medical Instrumentation

■

Thermocouple Amplifiers

■

High Resolution Data Acquisition

■

Maximum Offset Voltage Drift: 0.05µV/°C

■

High Voltage Operation: ±18V

■

No External Components Required

■

Maximum Offset Voltage: 5µV

■

Low Noise: 1.5µV

P-P

(0.1Hz to 10Hz)

■

Minimum Voltage Gain: 125dB

■

Minimum CMRR: 106dB

■

Minimum PSRR: 110dB

■

Low Supply Current: 0.9mA/Amplifier

■

Single Supply Operation: 4.75V to 36V

■

Input Common Mode Range Includes Ground

■

Typical Overload Recovery Time: 20ms

■

Available in 8-Lead N8 and 16-Lead SW Packages

Noise Spectrum

±15V Dual Thermocouple Amplifier

FREQUENCY (Hz)

NOISE VOLTAGE (nV/√Hz)

1 100 1k 10k

1151 TA02

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

All other trademarks are the property of their respective owners.

Summary of content (12 pages)

PAGE 1
LTC1151 Dual ±15V Zero-Drift Operational Amplifier U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO The LTC®1151 is a high voltage, high performance dual zero-drift operational amplifier. The two sample-and-hold capacitors per amplifier required externally by other chopper amplifiers are integrated on-chip. The LTC1151 also incorporates proprietary high voltage CMOS structures which allow operation at up to 36V total supply voltage. Maximum Offset Voltage Drift: 0.
PAGE 2
LTC1151 W W W AXI U U ABSOLUTE RATI GS (Note 1) Total Supply Voltage (V + to V –) ............................. 36V Input Voltage (Note 2) .......... (V + + 0.3V) to (V – – 0.3V) Output Short Circuit Duration ......................... Indefinite Burn-In Voltage ...................................................... 36V Operating Temperature Range LTC1151C .............................................. 0°C to 70°C Storage Temperature Range ................
PAGE 3
LTC1151 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±15V, unless otherwise specified. PARAMETER CONDITIONS Maximum Output Voltage Swing RL = 10k, TA = 25°C RL = 10k RL = 100k Slew Rate MIN ● RL = 10k, CL = 50pF No Load, TA = 25°C No Load MAX UNITS ±13.5 ±14.50 +10.5/–13.5 ±14.95 Gain-Bandwidth Product Supply Current per Amplifier LTC1151C TYP 2.5 V/µs 2 MHz 0.
PAGE 4
LTC1151 U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage 2.5 15 2.00 VS = ±15V 2.0 1.5 1.0 0.5 1.75 1.
PAGE 5
LTC1151 U W TYPICAL PERFOR A CE CHARACTERISTICS Input Bias Current Magnitude vs Supply Voltage Input Bias Current Magnitude vs Temperature 60 18 1000 VCM = 0 VS = ±15V TA = 25°C VCM = 0V 100 10 12 9 6 3 1 –50 25 50 75 0 TEMPERATURE (°C) 100 125 30 –IB 15 0 –15 +IB –30 –45 0 –25 VS = ±15V TA = 25°C 45 INPUT BIAS CURRENT (pA) INPUT BIAS CURRENT (pA) 15 0 ±2 –60 –15 ±4 ±6 ±8 ±10 ±12 ±14 ±16 SUPPLY VOLTAGE (V) –5 5 10 –10 0 INPUT COMMON MODE VOLTAGE (V) 15 1151 G12 1151 G11 1151 G10
PAGE 6
LTC1151 TEST CIRCUITS Offset Voltage Test Circuit 1M 1k 2 – V+ 7 LTC1151 3 + 6 RL 4 V OUTPUT – 1151 TC01 DC-10Hz Noise Test Circuit 100pF 100k 5V 5V 2 10Ω – 7 LTC1151 3 + 2 6 800k 4 –5V 0.02µF 3 – 8 1/2 LT1057 +4 –5V 0.04µF 6 800k 5 – 1/2 LT1057 1 800k 7 OUTPUT + 0.
PAGE 7
LTC1151 U W U UO APPLICATI S I FOR ATIO ACHIEVING PICOAMPERE/MICROVOLT PERFORMANCE Picoamperes In order to realize the picoampere level of accuracy of the LTC1151 proper care must be exercised. Leakage currents in circuitry external to the amplifier can significantly degrade performance. High quality insulation should be used (e.g., Teflon); cleaning of all insulating surfaces to remove fluxes and other residues will probably be necessary, particularly for high temperature performance.
PAGE 8
LTC1151 U W U UO APPLICATI S I FOR ATIO Resistors are another source of thermal EMF errors. Table 1 shows the thermal EMF generated for different resistors. The temperature gradient across the resistor is important, not the ambient temperature. There are two junctions formed at each end of the resistor and if these junctions are at the same temperature, their thermal EMFs will cancel each other. The thermal EMF numbers are approximate and vary with resistor value. High values give higher thermal EMF.
PAGE 9
LTC1151 UO TYPICAL APPLICATI S High Voltage Instrumentation Amplifier 1k V+ 1M 1M 2 – 8 1/2 LTC1151 –IN 3 0.1µF 1 1k 6 + +IN 5 – 1/2 LTC1151 + 4 7 VOUT GAIN = 1000V/V OUTPUT OFFSET < 5mA 0.
PAGE 10
LTC1151 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) .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 8.255 +0.889 –0.381 ) .045 – .065 (1.143 – 1.651) .130 ± .005 (3.302 ± 0.127) .065 (1.651) TYP .100 (2.54) BSC .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 (0.457 ± 0.076) N8 1002 NOTE: 1.
PAGE 11
LTC1151 U PACKAGE DESCRIPTIO SW Package 16-Lead Plastic Small Outline (Wide .300 Inch) (Reference LTC DWG # 05-08-1620) .050 BSC .045 ±.005 .030 ±.005 TYP .398 – .413 (10.109 – 10.490) NOTE 4 16 N 15 14 13 12 11 10 9 N .325 ±.005 .420 MIN .394 – .419 (10.007 – 10.643) NOTE 3 1 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT 1 .005 (0.127) RAD MIN .009 – .013 (0.229 – 0.330) .291 – .299 (7.391 – 7.595) NOTE 4 .010 – .029 × 45° (0.254 – 0.737) 3 4 5 6 .093 – .104 (2.362 – 2.
PAGE 12
LTC1151 UO TYPICAL APPLICATI S Bridge Amplifier with Active Common-Mode Suppression 15V 15V 49.9k 350Ω TRIM TO SET BRIDGE OPERATING CURRENT 0.1µF – 1/2 LTC1151 350Ω STRAIN GAUGE – 1/2 LTC1151 VOUT AV = 100 + 499Ω + 0.1µF –15V 1151 TA04 390Ω –15V RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC1049 Low Power Zero-Drift Op Amp Low Supply Current 200µA LTC1050 Precision Zero-Drift Op Amp Single Supply Operation 4.