OP471 High-Speed Low-Noise Quad Op-Amp

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OP471 is a High-Speed Low-Noise Quad Op-Amp IC. OP471 has an input offset voltage under 0.8 mV and input offset voltage drift below 4 mV/∞C, guaranteed over the full military temperature range. The open-loop gain of the OP471 is over 500,000 into a 10 kW load ensuring outstanding gain accuracy and linearity.

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Operational Amplifier

An operational amplifier is one of the basic building blocks for analog circuits, An operational amplifier takes in differential voltage input and produces a single-ended voltage output. The basic purpose of employing an operational amplifier in an analog circuit is to perform the function of signal amplification: The process of boosting an electrical signal of low strength to a level of higher amplitude. Op-amps also function as a filter of the input signal; meaning that, an operational amplifier is able to extract the signal with the target frequency. Op-amps can be divided into two fundamental parts:

Precision Op-amps
Differential Op-amps

OP471 Pinout

OP471 Pin Configuration

Pin No	Pin Name	Description
1	OUT A	Output Of Amplifier A
2	INV-INPUT A	Inverting Input Of Amplifier A
3	NON-INV-INPUT A	Non Inverting Input Of Amplifier A
4	V+	Positive Power Supply
5	NON-INV-INPUT B	Non Inverting Input Of Amplifier B
6	INV-INPUT B	Inverting Input Of Amplifier B
7	OUT B	Output Of Amplifier B
8	OUT C	Output Of Amplifier C
9	INV-INPUT C	Inverting Input Of Amplifier C
10	NON-INV-INPUT C	Non Inverting Input Of Amplifier C
11	V-	Negative Power Supply
12	NON-INV-INPUT D	Non Inverting Input Of Amplifier D
13	INV-INPUT D	Inverting Input Of Amplifier D
14	OUT D	Output Of Amplifier D

OP471 Features

Excellent Speed: 8 V/s Typ
Low Noise: 11 nV/˜Hz @ 1 kHz Max
Unity-Gain Stable
High Gain Bandwidth: 6.5 MHz Typ
Low Input Offset Voltage: 0.8 mV Max
Low Offset Voltage Drift: 4 V/C Max
High Gain: 500 V/mV Min
Outstanding CMR: 105 dB Min

Application

Low Noise Amplifier

A simple method of reducing amplifier noise by paralleling amplifiers is shown in Figure 13. Amplifier noise, depicted in Figure 14, is around 5 nV/˜Hz @ 1 kHz (R.T.I.). Gain for each paralleled amplifier and the entire circuit is 100. The 200 W resistors limit circulating currents and provide an effective output resistance of 50 W. The amplifier is stable with a 10 nF capacitive load and can supply up to 30 mA of output drive.