Quad Low Offset, Low Power

Operational Amplifier

Data Sheet

OP400

Rev. I

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FEATURES

Low input offset voltage: 150 μV (maximum)

Low offset voltage drift over –55°C to +125°C: 1.2 μV/°C

(maximum)

Low supply current (per amplifier): 725 μA (maximum)

High open-loop gain: 5000 V/mV (minimum)

Input bias current: 3 nA (maximum)

Low noise voltage density: 11 nV/√Hz at 1 kHz

Stable with large capacitive loads: 10 nF typical

Available in die form

FUNCTIONAL BLOCK DIAGRAMS

OUT A 1

–IN A 2

+IN A 3

V+

4

OUT D

–IN D

+IN D

V–

14

13

12

11

+IN B

5

–IN B

6

OUT B 7

+IN C

–IN C

OUT C

10

9

8

OP400

+

–

+

–

+

–

+

–

OUTA 1

–IN A 2

+IN A 3

V+

4

OUT D

–IN D

+IN D

V–

16

15

14

13

+IN B

5

–IN B

6

OUT B 7

+IN C

–IN C

OUT C

12

11

10

NC

8

NC

9

OP400

NC = NO CONNECT

+

–

+

–

+

–

+

–

Figure 1. 14-Lead Ceramic Dual In-Line

Package [CERDIP] and 14-Lead Plastic

Dual In-Line Package [PDIP]

Figure 2. 16-Lead Standard Small

Outline Package [SOIC_W]

GENERAL DESCRIPTION

The OP400 is the first monolithic quad operational amplifier

that features OP77-type performance. Precision performance is

not sacrificed with the OP400 to obtain the space and cost savings

offered by quad amplifiers.

The OP400 features an extremely low input offset voltage of less

than 150 μV with a drift of less than 1.2 μV/°C, guaranteed over

the full military temperature range. Open-loop gain of the OP400

is more than 5 million into a 10 kΩ load, input bias current is

less than 3 nA, common-mode rejection (CMR) is more than

120 dB, and power supply rejection ratio (PSRR) is less than

1.8 μV/V. On-chip Zener zap trimming achieves the low input

offset voltage of the OP400 and eliminates the need for offset

nulling. The OP400 conforms to the industry-standard quad

pinout, which does not have null terminals.

The OP400 features low power consumption, drawing less than

725 μA per amplifier. The total current drawn by this quad

amplifier is less than that of a single OP07, yet the OP400 offers

significant improvements over this industry-standard op amp.

Voltage noise density of the OP400 is a low 11 nV/√Hz at 10 Hz,

half that of most competitive devices.

The OP400 is an ideal choice for applications requiring multiple

precision operational amplifiers and where low power

consumption is critical.

VOLTAGE

LIMITING

NETWORK

+IN

–IN

V–

OUT

V+

BIAS

Figure 3. Simplified Schematic (One of Four Amplifiers Is Shown)