DAC8771 - Single-Channel 16-Bit Voltage- and Current-Output DAC With Adaptive Power Management

The DAC8771 is a single channel, precision, fully integrated 16-bit digital to analogconverter (DAC) with adaptive power management, and is designed to meet the requirements ofindustrial control applications. The adaptive power management circuit, when enabled, minimizes thepower dissipation of the chip. When programmed as a current output, the supply voltage on thecurrent output driver is regulated between 4 V and 32 V based on continuous feedback of voltage onthe current output pin via a buck/boost converter. When programmed as a voltage output, thiscircuit generates a programmable supply voltage for the voltage output stage (±15 V). DAC8771contains an LDO to generate the digital supply (5 V) from a single power supply pin, particularlyhelpful in isolated applications.

DAC8771 is also implemented with a HART Signal Interface to superimpose an external HARTsignal on the current output. The slew rate of the current output DAC is register programmable. Thedevices can operate with a single external power supply of +12 V to +36 V using the integratedbuck/boost converter or with external power supplies when the buck/boost converter isdisabled.

• Output Current:
  • 0 mA - 24 mA; 3.5 mA - 23.5 mA;
    0 mA - 20 mA; 4 mA - 20 mA; ±24 mA
• Output Voltage (with/without 20% over-range):
  • 0 V - 5 V; 0 V - 10 V; ±5 V; ±10 V
  • 0 V - 6 V; 0 V - 12 V; ±6 V; ±12 V
• Adaptive Power Management
• Single Wide Power Supply Pin
  • 12 V - 36 V with Buck-Boost
  • 12 V - 33 V without Buck-Boost
• ±0.1% FSR Total Unadjusted Error (TUE)
• DNL: ±1 LSB Max
• Internal 5-V Reference (10 ppm/°C max)
• Internal 5-V Digital Power Supply Output
• CRC/Frame Error Check, Watchdog Timer
• Thermal Alarm, Open/Short circuit
• Safe actions on alarm condition
• Auto Learn Feature
• Wide Temperature Range: –40°C to +125°C

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