DAC8564 datasheet(38/51 Pages) TI1

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REF

+6V

±5V

-6V

OPA703

DAC8564

10 F

0.1 F

10kW

3-Wire

SerialInterface

OUT

GND

REF

65536

REF

R +R

- 5V

65536

+6V

±2.5V

-6V

OPA703

DAC8564

150nF

10kW

3-Wire

SerialInterface

OUT

GND

REF

DAC8564

SBAS403D

– JUNE 2007 – REVISED MAY 2011

www.ti.com

BIPOLAR OPERATION USING THE DAC8564

The

DAC8564

designed

for

single-supply

operation, but a bipolar output range is also possible

using the circuit in either Figure 99 or Figure 100.

The circuit shown gives an output voltage range of

±VREF. Rail-to-rail operation at the amplifier output is

achievable using an OPA703 as the output amplifier.

The output voltage for any input code can be

calculated with Equation 4:

Figure 99. Bipolar Output Range Using External

Reference at 5V

(4)

where D represents the input code in decimal

–65535).

With VREFH = 5V, R1 = R2 = 10kΩ.

(5)

This result has an output voltage range of

±5V with

0000h corresponding to a

–5V output and FFFFh

corresponding

+5V

output,

shown

Figure 99. Similarly, using the internal reference, a

±2.5V output voltage range can be achieved, as

Figure 100 shows.

Figure 100. Bipolar Output Range Using Internal

Reference

DAC8564 Datasheet(PDF) 38 Page - Texas Instruments

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