Datasheet

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LTC1049

1049fb

Typical applicaTion

FeaTures DescripTion

Low Power Zero-Drift

Operational Amplifier

with Internal Capacitors

The LTC

1049 is a high performance, low power zero-drift

operational amplifier. The two sample-and-hold capacitors

usually required externally by other chopper stabilized

amplifiers are integrated on the chip. Further, the LTC1049

offers superior DC and AC performance with a nominal

supply current of only 200µA.

The LTC1049 has a typical offset voltage of 2µV, drift of

0.02µV/°C, 0.1Hz to 10Hz input noise voltage of 3µV

P-P

and typical voltage gain of 160dB. The slew rate is 0.8V/µs

with a gain bandwidth product of 0.8MHz.

Overload recovery time from a saturation condition is

6ms, a significant improvement over chopper amplifiers

using external capacitors.

The LTC1049 is available in a standard 8-pin plastic dual

in line, as well as an 8-pin SO package. The LTC1049 can

be a plug-in replacement for most standard op amps with

improved DC performance and substantial power savings.

applicaTions

Low Supply Current: 200µA

No External Components Required

Maximum Offset Voltage: 10µV

Maximum Offset Voltage Drift: 0.1µV/°C

Single Supply Operation: 4.75V to 16V

Input Common Mode Range Includes Ground

Output Swings to Ground

Typical Overload Recovery Time: 6ms

Available in 8-Pin SO and PDIP Packages

4mA to 20mA Current Loops

Thermocouple Amplifiers

Electronic Scales

Medical Instrumentation

Strain Gauge Amplifiers

High Resolution Data Acquisition

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

All other trademarks are the property of their respective owners.

Single Supply Thermocouple Amplifier

0.1µF

–

GND

246k

SUPPLY CURRENT = 280µA

OUT

= 0V TO 4V

FOR 0°C TO 400°C

0.068µF

= 5V

–

LTC1049 • TA01

1025A

TYPE K

–

LTC1049

Summary of content (12 pages)

PAGE 1
LTC1049 Low Power Zero-Drift Operational Amplifier with Internal Capacitors Description Features n n n n n n n n n Low Supply Current: 200µA No External Components Required Maximum Offset Voltage: 10µV Maximum Offset Voltage Drift: 0.1µV/°C Single Supply Operation: 4.75V to 16V Input Common Mode Range Includes Ground Output Swings to Ground Typical Overload Recovery Time: 6ms Available in 8-Pin SO and PDIP Packages The LTC®1049 is a high performance, low power zero-drift operational amplifier.
PAGE 2
LTC1049 Absolute Maximum Ratings (Note 1) Total Supply Voltage (V + to V –).................................18V Input Voltage (Note 2).............(V+ + 0.3V) to (V – – 0.3V) Output Short-Circuit Duration........................... Indefinite Operating Temperature Range..................–40°C to 85°C Storage Temperature Range...................–65°C to 150°C Lead Temperature (Soldering, 10 sec)....................
PAGE 3
LTC1049 Electrical Characteristics Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Connecting any terminal to voltages greater than V + or less than V – may cause destructive latch-up. It is recommended that no sources operating from external supplies be applied prior to power-up of the LTC1049.
PAGE 4
LTC1049 Typical Performance Characteristics Sampling Frequency vs Supply Voltage Sampling Frequency vs Temperature 5 3000 CMRR vs Frequency 160 VS = ±5V VS = ±5V 2500 2000 1500 4 120 3 CMRR (dB) SAMPLING FREQUENCY (kHz) SAMPLING FREQUENCY (Hz) 140 2 100 80 60 40 1 20 1000 4 0 50 25 0 75 100 –50 –25 AMBIENT TEMPERATURE (°C) 14 16 6 8 10 12 TOTAL SUPPLY VOLTAGE, V + TO V – (V) 125 0 1 10 100 1k FREQUENCY (Hz) 10k LTC1049 • TPC09 LTC1049 • TPC08 LTC1049 • TPC07 Small-Signal Tran
PAGE 5
LTC1049 Typical Performance Characteristics LTC1049 DC to 10Hz Noise VS = ±5V NOISE VOLTAGE 1µV/DIV 10Hz NOISE 1µV/DIV 1s/DIV LTC1049•TPC14 Test Circuits Electrical Characteristics Test Circuit DC to 10Hz and DC to 1Hz Noise Test Circuit 140 8 COMMON MODE VOLTAGE (V) VOLTAGE NOISE (nV/√Hz) 120 100 80 60 40 20 VCM = V – 6 4 2 0 –2 –4 –6 10 100 1k 10k 100k FREQUENCY (Hz) LTC1049 • TP01 –8 0 1 4 5 2 3 6 SUPPLY VOLTAGE (±V) 7 8 LTC1049 • TPC02 1049fb 5
PAGE 6
LTC1049 Applications Information ACHIEVING PICOAMPERE/MICROVOLT PERFORMANCE Picoamperes In order to realize the picoampere level of accuracy of the LTC1049, 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™, Kel-F); cleaning of all insulating surfaces to remove fluxes and other residues will probably be necessary—particularly for high temperature perfor mance.
PAGE 7
LTC1049 Typical Applications Low Power, Low Hold Step Sample-and-Hold 5V 13 2 4.5 LTC201 VIN S/H 3 2 1 3 – 5V 7 LTC1049 + 0.
PAGE 8
LTC1049 Typical Applications Low Power, Single Supply, Low Offset Instrumentation Amp 5V 198k 2k 2 – – VIN + 198k 2 7 LTC1049 3 2k 6 – 7 LTC1049 3 4 + 6 VOUT 4 + VIN GAIN = 100 IS = 400µA CMRR ≥ 60dB, WITH 0.
PAGE 9
LTC1049 Package Description J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) CORNER LEADS OPTION (4 PLCS) .023 – .045 (0.584 – 1.143) HALF LEAD OPTION .045 – .068 (1.143 – 1.650) FULL LEAD OPTION .005 (0.127) MIN .405 (10.287) MAX 8 7 6 5 .025 (0.635) RAD TYP .220 – .310 (5.588 – 7.874) 1 .300 BSC (7.62 BSC) 2 3 4 .200 (5.080) MAX .015 – .060 (0.381 – 1.524) .008 – .018 (0.203 – 0.
PAGE 10
LTC1049 Package Description 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) .065 (1.651) TYP .100 (2.54) BSC .130 ± .005 (3.302 ± 0.127) .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 (0.457 ± 0.076) N8 1002 NOTE: 1.
PAGE 11
LTC1049 Package Description S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .050 BSC .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 8 .245 MIN .160 ±.005 5 .150 – .157 (3.810 – 3.988) NOTE 3 1 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) 2 3 4 .053 – .069 (1.346 – 1.752) .004 – .010 (0.101 – 0.254) 0°– 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN 6 .228 – .244 (5.791 – 6.197) .030 ±.005 TYP .008 – .010 (0.203 – 0.
PAGE 12
LTC1049 Typical Application Thermocouple-Based Temperature to Frequency Converter 6V V+ GND – – + 1M LTC1049 R– Q2 2N3906 + 6.81k* Q1 2N3904 NC 10k 100k K LT1025 6V 0.02µF TYPE K THERMOCOUPLE l1 l2 100k C1 100pF C3 0.47µF 1.5k 240k + 100°C TRIM C4 300pF 6V 9 11 14 C2 390pF † S1 10 S4 IS = 360µA SUPPLY RANGE = 4.5V to 10V S2 3 *IRC/TRW–MTR–5/+120ppm †POLYSTYRENE = 74C14 S3 2 OUTPUT 0 – 100°C = 0 – 1kHz LT1004 – 1.2 6.