AD5791 View Datasheet(PDF) - Analog Devices

Part Name

Description

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AD5791

1 ppm 20-Bit, ±1 LSB INL, Voltage Output DAC

Analog Devices 

Data Sheet

Gain of Two Configuration

Figure 52 shows an output amplifier configured for a gain of

two. The gain is set by the internal matched 6.8 kΩ resistors,

which are exactly twice the DAC resistance, having the effect of

removing an offset from the input bias current of the external

amplifier. In this configuration, the output spans from 2 ×

VREFN − VREFP to VREFP. This configuration is used to generate a

bipolar output span from a single ended reference input with

VREFN = 0 V. For this mode of operation, the RBUF bit of the

control register must be cleared to Logic 0.

AD5791

VREFP

1/2 AD8676

VREFPF

VREFPS

A1

20-BIT

DAC

R1 RFB RFB

6.8kΩ 6.8kΩ

INV

VOUT

VREFNF

1/2 AD8676

VREFNS

AD5791

10pF

VOUT

AD8675,

ADA4898-1

VREFN = 0V

Figure 52. Output Amplifier in Gain of Two Configuration

Rev. D | Page 25 of 28

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