1

LTC2050

Zero-Drift

Operational Amplifier

in SOT-23

November 1999

s

Thermocouple Amplifiers

s

Electronic Scales

s

Medical Instrumentation

s

Strain Gauge Amplifiers

s

High Resolution Data Acquisition

s

DC Accurate RC Active Filters

S

APPLICATI

s

SOT-23 Package

s

Maximum Offset Voltage of 3

µV

s

Maximum Offset Voltage Drift of 30nV/

°C

s

Noise: 1.5

s

Voltage Gain: 140dB (Typ)

s

PSRR: 130dB (Typ)

s

CMRR: 130dB (Typ)

s

Supply Current: 0.8mA (Typ)

s

Single Supply Operation: 2.7V to 6V

s

Extended Common Mode Input Range

s

Output Swings Rail-to-Rail

s

Overload Recovery Time: 2ms (Typ)

S

FEATURE

DESCRIPTIO

The LTC

in the 5- or 6-lead SOT-23 and SO-8 packages. It operates

from a single 2.7V supply while still supporting 5V appli-

cations. The power consumption is 800

µA and the ver-

sions in the 6-lead SOT-23 and SO-8 packages offer power

shutdown (active low).

The LTC2050, despite its miniature size, features uncom-

promising DC performance. The typical input offset volt-

age and offset drift are 0.5

µV and 10nV/°C. The almost

zero DC offset and drift are supported with a power supply

rejection ratio (PSRR) and common mode rejection ratio

(CMRR) of more than 130dB.

The input common mode voltage ranges from the negative

supply up to 1V from the positive supply. The LTC2050

also has an enhanced output stage capable of driving

loads as low as 1k

Ω to both supply rails. The open-loop

gain, loaded with 1k

Ω,isinexcessof140dB.TheLTC2050

also features a 1.5

bandwidth product.

Input Referred Noise 0.1Hz to 10Hz

Differential Bridge Amplifier

APPLICATI

TYPICAL

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

–

+

5V

1000pF

18.2k

1000pF

18.2k

7

6

4

3

2

0.1

µF

5V

2050 TA01

350

Ω

STRAIN

GAUGE

50

Ω

GAIN

TRIM

LTC2050

TIME (s)

0

3

1

8

LT2050 TA02

0

–1

–3

2

4

6

10

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

Final Electrical Specifications