OP177 Ultra-precision Op-Amp

Contents hide

OP177 features the highest precision performance of any op amp currently available. Offset voltage of the OP177 is only 10 mV max at room temperature and 20 mV max over the full military temperature range of –55°C to +125°C. The ultralow VOS of the OP177, combines with its exceptional offset voltage drift (TCVOS) of 0.1 mV/°C max, to eliminate the need for external VOS adjustment and increases system accuracy over temperature.

Precision Operational Amplifier

Precision amplifiers are op amps with better design specifications in terms of precision offset, zero-drift over time, lower internal noise, and input bias current. These op-amps are used in analog filters where they do not distort or DC offset the signal of interest. Their functionality and mode of use is somewhat similar to conventional op – amps; but, the output is precise, accurate, and virtually free of any kind of noise.

OP177 Pinout

OP177 Pin Configuration

Pin No	Pin Name	Description
1	VOS TRIM 1	Input Offset Voltage TRIM 1
2	INV-INPUT	Inverting Input Of Amplifier
3	NON-INV-INPUT	Non Inverting Input Of Amplifier
4	V-	Negative Power Supply
5	NC	No Connection
6	OUT	Output Of Amplifier
7	V+	Positive Power Supply
8	VOS TRIM 2	Input Offset Voltage TRIM 2

OP177 Features

Outstanding Offset Voltage Drift: 0.1 mV/8C max
Excellent Open-Loop Gain and Gain Linearity:12 V/mV typ
CMRR: 130 dB min
PSRR: 120 dB min
Low Supply Current: 2.0 mA max

Application

GAIN LINEARITY
The actual open-loop gain of most monolithic op amps varies at different output voltages. This nonlinearity causes errors in high closed-loop gain circuits. It is important to know that the manufacturer’s AVO specification is only a part of the solution, since all automated testers use endpoint testing and, therefore, only show the average gain. For example, Figure 22 shows a typical precision op amp with a respectable open-loop gain of 650 V/mV. However, the gain is not constant through the output voltage range, causing nonlinear errors