Texas Instruments' DAC8775 is a quad-channel precision, fully integrated, 16-bit, DAC with adaptive power management. It is designed to meet the requirements of industrial control applications. The adaptive power management circuit, when enabled, minimizes the power dissipation of the chip. When programmed as a current output, the supply voltage on the current output driver is regulated between 4.5 V and 32 V based on continuous feedback of voltage on the current output pin via an integrated buck/boost converter. When programmed as a voltage output, this circuit generates a programmable supply voltage for the voltage output stage (±15 V). DAC8775 also contains an LDO to generate the digital supply (5 V) from a single power supply pin.
DAC8775 is also implemented with a highway addressable remote transducer (HART) signal interface to superimpose an external HART signal on the current output. The slew rate of the current output DAC is register programmable. The device can operate with a single external power supply of +12 V to +36 V using the integrated buck/boost converters or with external power supplies when the buck/boost converters are disabled.
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- Output current:
- 0 mA to 24 mA; 3.5 mA to 23.5 mA; 0 mA to 20 mA; 4 mA to 20 mA; ±24 mA
- Output voltage (with/without 20% over-range):
- 0 V to 5 V; 0 V to 10 V; ±5 V; ±10 V
- 0 V to 6 V; 0 V to 12 V; ±6 V; ±12 V
- Adaptive power management
- Single wide power supply pin (12 V to 36 V)
- ±0.1% FSR total unadjusted error (TUE)
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- 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 for system reliability
- Safe actions on alarm condition
- Auto learn load detection
- Wide temperature range: -40°C to +125°C
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| Applications |
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- 4 mA to 20 mA current loops
- Analog output modules
- Programmable logic controllers (PLCs)
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- Building automation
- Sensor transmitters
- Process control
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Texas Instruments' DAC8775 is a quad-channel precision, fully integrated, 16-bit, DAC with adaptive power management. It is designed to meet the requirements of industrial control applications. The adaptive power management circuit, when enabled, minimizes the power dissipation of the chip. When programmed as a current output, the supply voltage on the current output driver is regulated between 4.5 V and 32 V based on continuous feedback of voltage on the current output pin via an integrated buck/boost converter. When programmed as a voltage output, this circuit generates a programmable supply voltage for the voltage output stage (±15 V). DAC8775 also contains an LDO to generate the digital supply (5 V) from a single power supply pin.
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