Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsLinear ICsLinear IC - Op-amp Scrambler (zero drift) PDIP 8

LTC1047

1047fa

■

No External Components Required

■

Maximum Offset Voltage: 10

■

Maximum Offset Voltage Drift: 50nV/

■

Supply Current: 80µA

■

Minimum CMRR: 110dB

■

Minimum PSRR: 105dB

■

Single Supply Operation: 4.75V to 16V

■

Common Mode Range Includes GND

■

Output Swings to GND

■

Typical Overload Recovery Time: 70ms

■

Pin Compatible with Industry Standard Dual

Op Amps

The LTC

1047 is a micropower, high performance

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

capacitors usually required by other chopper amplifiers

are integrated on-chip, minimizing the need for external

components.

The LTC1047 has a typical offset voltage of 3µV, drift

of 10nV/°C, input noise voltage typically 3.5µV

P-P

and typical voltage gain of 150dB. The common mode

rejection is 110dB minimum, with minimum power supply

rejection of 105dB. The LTC1047 also offers a 0.2V/µs

slew rate and a gain bandwidth product of 200kHz. Over-

load recovery time from saturation is 70ms, four times

faster than chopper amplifiers with external capacitors.

The LTC1047 is available in a standard plastic 8-pin PDIP

as well as a 16-pin SW package. The LTC1047 is a plug-in

replacement for most dual op amps with improved DC

performance and substantial power savings.

Micropower Single Supply Instrumentation Amplifier

Dual Micropower

Zero-Drift Operational Amplifier

with Internal Capacitors

CMRR vs Frequency

■

Thermocouple Amplifiers

■

Electronic Scales

■

Battery Powered Instrumentation

■

Strain Gauge Amplifiers

■

Remote Located Sensors

LT1047 • TA02

FREQUENCY OF COMMON MODE SIGNAL

100

CMRR (dB)

100

120

140

1k 10k 100k

= C

= 1µF

100Ω

1/2 LTC1043

100k

OUT

–IN

+IN

1µF

0.1µF

–

1/2

LTC1047

GAIN = 1000

CMRR > = 120dB AT 60Hz

= < 10µV

= 62µA (INCLUDING THE LTC1043)

LTC1047 • TA01

FEATURES

APPLICATIO S

DESCRIPTIO

TYPICAL APPLICATIO

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

Summary of content (12 pages)

PAGE 1
LTC1047 Dual Micropower Zero-Drift Operational Amplifier with Internal Capacitors DESCRIPTIO U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ The LTC®1047 is a micropower, high performance dual zero-drift operational amplifier. The sample-and-hold capacitors usually required by other chopper amplifiers are integrated on-chip, minimizing the need for external components.
PAGE 2
LTC1047 W W W AXI U U ABSOLUTE RATI GS (Note 1) Total Supply Voltage (V + to V –) ............................... 16V Input Voltage (Note 2) .......... (V + + 0.3V) to (V – – 0.3V) Output Short-Circuit Duration .......................... Indefinite Storage Temperature Range ................. – 65°C to 150°C Operating Temperature Range ..................... 0°C to 70°C Lead Temperature (Soldering, 10 sec)..................
PAGE 3
LTC1047 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±5V, unless otherwise noted.
PAGE 4
LTC1047 U W TYPICAL PERFOR A CE CHARACTERISTICS CMRR vs Frequency PSRR vs Frequency 120 160 VS = ±5V TA = 25°C 140 100 120 PSRR (dB) CMRR (dB) 80 100 80 60 NEGATIVE SUPPLY 60 40 40 POSITIVE SUPPLY 20 20 0 0 1 10 100 1k FREQUENCY (Hz) 10k 1 100k 10 100 1k FREQUENCY (Hz) Sampling Frequency vs Supply Voltage Gain, Phase vs Frequency, ±5V 90 135 40 GAIN 20 180 0 225 104 105 FREQUENCY (Hz) 106 270 SAMPLING FREQUENCY, fS (Hz) PHASE PHASE SHIFT (DEGREES) GAIN (dB) 900 45 80
PAGE 5
LTC1047 U W TYPICAL PERFOR A CE CHARACTERISTICS Overload Recovery Large-Signal Transient Response 0 Photo –5V 200mV 0 AV = +1 RL = 100k CL = 50pF VS = ±5V AV = 100 VS = ±5V 10µs/DIV 10ms/DIV LTC1047 • TPC13 LTC1047 • TPC12 TEST CIRCUITS Electrical Characteristics Test Circuit 1M 1k V+ 2 3 – 8 1/2 LTC1047 + 4 6 OUTPUT RL V– LTC1047 • TC01 DC to 10Hz Noise Test Circuit 100k 10Ω 475k 0.01µF 2 3 – 1/2 LTC1047 6 158k 316k 475k – LT®1012 + 0.01µF 0.
PAGE 6
LTC1047 U W U U APPLICATIO S I FOR ATIO Input Considerations Aliasing Frequently circuits built with parts as precise as the LTC1047 show errors at the output far greater than the designer expects. Rarely is the problem the op amp; more often the surrounding circuitry is causing errors several orders of magnitude greater than those due to the LTC1047.
PAGE 7
LTC1047 U TYPICAL APPLICATIO S Low Offset, Low Drift Instrumentation Amplifier 1M 1k 1k 1M 5V 2 –IN 3 6 – 1 1/2 LTC1047 + +IN 4 AV = 1000 VOS = ± 6µV IS = 100µA CMRR ≥ 120dB –5V 5 8 – 1/2 LTC1047 7 OUTPUT + LTC1047 • TA02 Precise DC Full-Wave Rectifier (Absolute Value Circuit) 220k 5V 220k INPUT 2 0V 3 IS = 50µA VOS = 3µV – 8 1/2 LTC1047 + 4 1N4148 1 5 6 + 1/2 LTC1047 7 OUTPUT – LTC1047 • TA03 1047fa 7
PAGE 8
LTC1047 U TYPICAL APPLICATIO S 4mA to 20mA Transducer Amplifier 4 5 LT1120 0.1µF 1M 1000pF 2 8 1 3 7 6 1M TO LOOP + 10µF 2 – 1/2 3 LTC1047 1 R2 61.9k 1% + INPUT 0V TO 1V INITIAL ACCURACY = 3% (LIMITED BY REFERENCE IN LT1120) TRIM R1 FOR 4.00mA WITH 0.00V IN TRIM R2 FOR 20.0mA WITH 1.00V IN R1 619K 1% 5 49.9k 1% 6 + 8 1/2 LTC1047 – 7 1k 2N2222 4 49.
PAGE 9
LTC1047 U TYPICAL APPLICATIO S Ultralow Noise Micropower Chopper 0.47µF 5V 5V 5V 0.1µF 75k – 1/2 LTC1047 + 100k 39k + 1/2 LTC1047 20k OUT – 100k +IN 50pF 0.1µF –IN –5V 100k 25K147 x 2 10Ω 150k 100k IS = 150µA 0.1Hz TO 10Hz = 95nVP-P AV = 10000 –5V LTC1047 • TA06 0.47µF 0.
PAGE 10
LTC1047 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
LTC1047 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 7 .093 – .104 (2.362 – 2.
PAGE 12
LTC1047 U TYPICAL APPLICATIO Low Noise, Low Drift Composite Amplifier 5V 5 10k 6 8 + 1/2 LTC1047 7 – 0.01µF 100k 2 3 – 1/2 LTC1047 + 5V 4 750Ω –5V INPUT 1000pF 1 3 + – 2 100k 56Ω 250k 1 + 7 8 LT ®1012 – 6 4 –5V VOS = 3µV 0.1Hz TO 10Hz NOISE = 0.7µVP-P IS = 490µA 100Ω OUTPUT LTC1047 • TA05 1047fa 12 Linear Technology Corporation LW/TP 1202 1K REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.