DAC8760IPWPR datasheet(27/63 Pages) TI1

27 / 63 page

12-/16-Bit

DAC

DACx760

Range

Scaling

RFB

íVSENSE

+VSENSE

VOUT

To Current Output

To Voltage Output

DAC7760, DAC8760

www.ti.com

SBAS528B – JUNE 2013 – REVISED JUNE 2016

Product Folder Links: DAC7760 DAC8760

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Feature Description (continued)

Figure 82. 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 Controlling

the VOUT and IOUT Pins 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 83 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, an external compensation capacitor can be connected between CMP and VOUT to keep the output

voltage stable at the expense of reduced bandwidth and increased settling time.

Figure 83. Voltage Output

The +VSENSE pin is provided to enable sensing of the load by connecting to points electrically closer to the

load. This configuration allows the internal output amplifier to make sure that the correct voltage is applied across

the load, as long as headroom is available on the power supply. Ideally, this pin is used to correct for resistive

drops on the system board and is connected to VOUT at the terminals. In some cases, both VOUT and

+VSENSE are brought out as terminals and, through separate lines, connected remotely together at the load. In

such cases, if the +VSENSE line is cut, the amplifier loop is broken; use an optional 5-kΩ resistor between

DAC8760IPWPR Datasheet(PDF) 27 Page - Texas Instruments