DAC7760IPWPR datasheet(52/69 Pages) TI2

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10 Power Supply Recommendations

The DACx760 family operates within the specified single-supply range of 10 V to 36 V applied to the AVDD pin.

The device also operates with the specified dual-supply range of 10 V to 18 V applied to AVDD, and 0 V to –18 V

on AVSS, or any subsequent combination that does not exceed the maximum difference of 36 V between AVDD

and AVSS. The digital supply, DVDD, operates within the specified supply range of 2.7 V to 5.5 V or is powered

by the internal 4.6-V LDO.

Switching power supplies and DC/DC converters often have high-frequency glitches or spikes riding on the

output voltage. In addition, digital components can create similar high frequency spikes. This noise can be

easily coupled into the DAC output voltage or current through various paths between the power connections and

analog output. To further reduce noise, include bulk and local decoupling capacitors.

CAUTION

Do not ramp the supplies for the DACx760 faster than 1 V/ns or damage may result to the device. To

help reduce the supply ramp, use a 10-Ω series resistor from the analog supply to the device AVDD

connection.

The DACx760 has internal power-on reset (POR) circuitry for both the digital DVDD and analog AVDD supplies.

This circuitry makes sure that the internal logic and power-on state of the DAC power up to the proper state

independent of the supply sequence. The recommended power-supply sequence is to first have the analog

AVDD supply come up, followed by the digital DVDD supply. DVDD can come up first as long as AVDD ramps to

at least 5 V within 50 μs. If neither condition can be satisfied, issue a software reset command using the SPI bus

after both AVDD and DVDD are stable.

The current consumption on the AVDD and AVSS pins, the short-circuit current limit for the voltage output, and

current ranges for the current output are listed in Section 7.5. The power supply must meet the requirements

listed in Section 7.5.

DAC7760, DAC8760

SBAS528D – JUNE 2013 – REVISED DECEMBER 2021

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DAC7760IPWPR 데이터시트(PDF) 52 Page - Texas Instruments