R

R

R

2R

2R

2R

R

5 kW

S2

S1

DGND

V

X

REF

V

DD

R X

FB

I

X

OUT

A

X

GND

Digitalinterfaceconnectionsomittedforclarity.

SwitchesS1andS2areclosed,V

mustbepowered.

DD

DAC

EN

A

B

Decode

SDI

CLK

DGND

MSB

R A

FB

V

A B

REF

R B

FB

I

A

OUT

A

A

GND

A

B

GND

I

B

OUT

Input

Register

Input

Register

DAC A

Register

DACB

Register

R

R

Power-On

Reset

R

R

DAC A

DACB

CS

16

D0

D1

D2

D3

D4

D5

D6

D7

D8

D9

D10

D11

D12

D13

D14

D15

A0

A1

RS

LDAC

DAC8812

www.ti.com

SBAS349C – AUGUST 2005 – REVISED NOVEMBER 2015

8 Detailed Description

8.1 Overview

The DAC8812 contains two 16-bit, current-output, digital-to-analog converters (DACs). Each DAC has its own

independent multiplying reference input. The DAC8812 uses a 3-wire, SPI-compatible serial data interface, with a

configurable asynchronous RS pin for half-scale (MSB = 1) or zero-scale (MSB = 0) preset. In addition, an LDAC

strobe enables two channel simultaneous updates for hardware synchronized output voltage changes.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Digital-to-Analog Converters

The DAC8812 contains two current-steering R-2R ladder DACs. Figure 30 shows a typical equivalent DAC. Each

accuracy.

Figure 30. Typical Equivalent DAC Channel

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