LTC1050ACN8 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC1050ACN8

Precision Zero-Drift Operational Amplifier with Internal Capacitors

Linear Technology 

LTC1050

APPLICATI S I FOR ATIO

When an external clock is used, it is directly applied to

Pin 5. The internal oscillator signal on Pin 5 has very low

drive capability and can be overdriven by any external

signal. When the LTC1050 operates on ±5V power sup-

plies, the external clock level is TTL compatible.

Using an external clock can affect performance of the

LTC1050. Effects of external clock frequency on input

offset voltage and input noise voltage are shown in the

Typical Performance Characteristics section. The sam-

pling frequency is the external clock frequency divided

by 4. Input bias currents at temperatures below 100°C

are dominated by the charge injection of input switches

and they are basically proportional to the sampling

frequency. At higher temperatures, input bias currents

are mainly due to leakage currents of the input protection

devices and are insensitive to the sampling frequency.

LOW SUPPLY OPERATION

The minimum supply for proper operation of the LTC1050

is typically below 4V (±2V). In single supply applications,

PSRR is guaranteed down to 4.7V (±2.35V) to ensure

proper operation down to the minimum TTL specified

voltage of 4.75V.

PIN COMPATIBILITY

The LTC1050 is pin compatible with the 8-pin versions of

7650, 7652 and other chopper-stabilized amplifiers. The

7650 and 7652 require the use of two external capacitors

connected to Pin 1 and Pin 8 that are not needed for the

LTC1050. Pin 1 and Pin 8 of the LTC1050 are not con-

nected internally while Pin 5 is an optional external clock

input pin. The LTC1050 can be a direct plug-in for the 7650

and 7652 even if the two capacitors are left on the circuit

board.

In applications operating from below 16V total power

supply, (±8V), the LTC1050 can replace many industry

standard operational amplifiers such as the 741, LM101,

LM108, OP07, etc. For devices like the 741 and LM101,

the removal of any connection to Pin 5 is all that is

needed.

TYPICAL APPLICATI S

Strain Gauge Signal Conditioner with Bridge Excitation

120Ω 2.5V

5V

LT1009

5V

2–

7

LTC1050

3+

4

– 5V

6 2k

350Ω

*

5V

BRIDGE

3+

7

6

LTC1050

301k

10k

ZERO

2–

RN60C

4

– 5V

OUTPUT

± 2.5V

C**

R2

0.1%

1N4148

2N2907

GAIN

TRIM

R1

0.1%

51Ω

2W

– 5V

1050 TA03

*OPTIONAL REFERENCE OUT TO MONITORING

10-BIT A/D CONVERTER

**AT GAIN = 1000, 10Hz PEAK-TO-PEAK NOISE

IS < 0.5LSB FOR 10-BIT RESOLUTION

1050fb

8

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