DAC7632 datasheet(12/21 Pages) BURR-BROWN

12 / 21 page

DAC7632

SBAS234

www.ti.com

FIGURE 1. DAC7632 Architecture.

REFH

OUT

OUT Sense

REFH Sense

REFL

REFL Sense

TYPICAL CHARACTERISTICS: VSS = –5V (Cont.)

At TA = +25°C, VDD = VCC = +5V, VSS = –5V, VREFH = +2.5V, VREFL = –2.5V, representative unit, unless otherwise specified.

Time (1

µs/div)

OUTPUT VOLTAGE

vs MID-SCALE GLITCH PERFORMANCE

+5V

LDAC

7FFF

H to 8000H

Time (1

µs/div)

OUTPUT VOLTAGE

vs MID-SCALE GLITCH PERFORMANCE

+5V

LDAC

8000

H to 7FFFH

THEORY OF OPERATION

The DAC7632 is a dual channel, voltage output, 16-bit DAC.

The architecture is an R-2R ladder configuration with the

three MSB’s segmented, followed by an operational amplifier

that serves as a buffer. Each DAC has its own R-2R ladder

network, segmented MSBs, and output op amp, as shown in

Figure 1. The minimum voltage output (zero-scale) and

maximum voltage output (full-scale) are set by the external

voltage references VREFL and VREFH, respectively.

The digital input is a 24-bit serial word that contains an

address bit for selecting one of two DACs, a quick load bit,

six unused bits, and the 16-bit DAC code (MSB first). The

converters can be powered from either a single +5V supply

or a dual

±5V supply. The device offers a reset function

which immediately sets all DAC output voltages, DAC regis-

ters and input registers to mid-scale (code 8000H) or to zero-

scale (code 0000H), depending on the state of RSTSEL. See

Figures 2 and 3 for the basic configurations of the DAC7632.

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