AD1580ARTZ-REEL(2011) 查看數據表（PDF） - Analog Devices

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AD1580ARTZ-REEL
(Rev.:2011)

1.2 V Micropower, Precision Shunt Voltage Reference

Analog Devices 

AD1580

The AD1580 is ideal for creating the reference level to use with 12-bit

multiplying DACs, such as the AD7943, AD7945, and AD7948.

In the single-supply bias mode (see Figure 26), the impedance

seen looking into the IOUT2 terminal changes with DAC code. If

the AD1580 drives IOUT2 and AGND directly, less than 0.2 LSBs

of additional linearity error results. The buffer amp eliminates

any linearity degradation that could result from variations in

the reference level.

3.3V

VIN

VREF

VDD

DAC

RBF

IOUT1

IOUT2

AD7943/

AD7945/

AD7948

AGND

DGND

C1

A1

VOUT

A1: OP295

AD822

OP2283

3.3V

41.2kΩ

A1

AD1580

SIGNAL GROUND

Figure 26. Single-Supply System

Rev. F | Page 10 of 12

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