DAC8760IPWPR.B datasheet(28/69 Pages) TI2

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8.3 Feature Description

8.3.1 DAC Architecture

The DAC8760 and DAC7760 (DACx760) consist of a resistor-string digital-to-analog converter (DAC) followed

by a buffer amplifier. The output of the buffer drives the current output and the voltage output. The resistor-string

section is simply a string of resistors, each of value R, from REF to GND, as Figure 8-1 illustrates. This type

of architecture makes sure the DAC is monotonic. The 16-bit binary digital code (DAC8760) loaded to the DAC

To Current Output

To Voltage Output

Figure 8-1. DAC Structure: Resistor String

The current-output stage converts the voltage output from the string to current. The voltage output provides a

buffered output of the programmed range to the external load. When the current output or the voltage output is

disabled, it is in a high impedance (Hi-Z) state. After power-on, both output stages are disabled. See Section

9.1.1 for different options to configure the current and voltage output pins.

8.3.2 Voltage Output Stage

The voltage output stage as conceptualized in Figure 8-2 provides the voltage output according to the DAC code

and the output range setting. The output range can be programmed as 0 V to 5 V or 0 V to 10 V for unipolar

output mode, and ±5 V or ±10 V for bipolar output mode. In addition, an option is available to increase the

output voltage range by 10%. The output current drive can be up to 10 mA. The output stage has short-circuit

current protection that limits the output current to 30 mA. To maintain proper performance, a minimum 0.5-V

power-supply headroom is required. The voltage output is able to drive a capacitive load up to 1 µF. For loads

greater than 20 nF, to keep the output voltage stable at the expense of reduced bandwidth and increased

settling time, connect an external compensation capacitor between CMP and VOUT. If an external compensation

capacitor greater than 470 pF is used, connect an additional 100-pF capacitor from CMP to GND.

12-/16-Bit

DAC

DACx760

Range

Scaling

RFB

íVSENSE

+VSENSE

VOUT

Figure 8-2. Voltage Output

DAC7760, DAC8760

SBAS528D – JUNE 2013 – REVISED DECEMBER 2021

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DAC8760IPWPR.B Datasheet(PDF) 28 Page - Texas Instruments