DAC53004 datasheet(52/62 Pages) TI

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8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

The DACx3004 are quad-channel buffered, force-sense output, voltage-output and current-output smart DACs

that include an NVM and internal reference, and available in a tiny 3-mm × 3-mm package. In voltage-output

mode, short the OUTx and FBx pins for each channel. In current-output mode, leave the FBx pins unconnected.

The FBx pins function as inputs in comparator mode. The external reference must not exceed VDD, either during

transient or steady-state conditions. For the best Hi-Z output performance, use a pullup resistor on the VREF

pin to VDD. In case the VDD remains floating during the off condition, place a 100-kΩ resistor to AGND for

proper detection of the VDD off condition. All the digital outputs are open drain; use external pullup resistors on

these pins. The interface protocol is detected at power-on, and the device locks to the protocol as long as VDD

is on. In I2C mode, when allocating the I2C addresses in the system, consider the broadcast address as well.

I2C timeout can be enabled for robustness. SPI mode is 3-wire by default. Configure the GPIO pin as SDO in

the NVM for SPI readback capability. The SPI clock speed in readback mode is slower than that in write mode.

Power-down mode sets the DAC outputs in Hi-Z by default. Change the configuration appropriately for different

power-down settings. The DAC channels can also power-up with a programmed DAC code in the NVM.

8.2 Typical Application

A power-supply margining and scaling circuit is used to trim, scale, or test the output of a power converter.

This example circuit is used to test a system by margining the power supplies for adaptive voltage scaling or to

program a desired value at the output. Adjustable power supplies, such as low dropout regulators (LDOs) and

DC/DC converters, provide a feedback or adjust the input that is used to set the desired output. A precision

voltage-output DAC is the best choice for controlling the power-supply output linearly. Figure 8-1 shows a control

circuit for a switch-mode power supply (SMPS) using the DACx3004. Typical applications of power-supply

margining are communications equipment, enterprise servers, test and measurement, and general-purpose

power-supply modules.

Figure 8-1. Voltage Margining and Scaling

DAC63004, DAC53004

SLASEX2 – APRIL 2021

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DAC53004 Datasheet(PDF) 52 Page - Texas Instruments