AD5791 datasheet(25/28 Pages) AD

Part #	AD5791

Description	True 18-Bit, Voltage Output DAC 짹0.5 LSB INL, 짹0.5 LSB DNL

PDF	28 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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25 / 28 page

Data Sheet

AD5781

Rev. D | Page 25 of 28

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

6.8kΩ 6.8kΩ

RFB

18-BIT

DAC

VREFPS

VREFPF

VREFP

VREFN = 0V

VREFNS

AD5781

1/2 AD8676

VREFNF

RFB

INV

VOUT

10pF

AD8675,

ADA4898-1,

ADA4004-1

VOUT

Figure 52. Output Amplifier in Gain of Two Configuration

AD5791 Datasheet(PDF) 25 Page - Analog Devices