DAC7750IRHAT.A中文资料德州仪器数据手册PDF规格书

1 Features

• Current output options:

– 0 mA to 24 mA

– 4 mA to 20 mA

– 0 mA to 20 mA

• ±0.1% FSR typical total unadjusted error (TUE)

• DNL: ±1 LSB maximum

• Maximum loop compliance voltage: AVDD – 2 V

• Internal 5-V reference: 10 ppm/°C (maximum)

• Internal 4.6-V power-supply output

• CRC frame error check

• Watchdog timer

• Thermal alarm

• Open-circuit alarm

• Pins to monitor output current

• On-chip fault alarm

• User-calibration for offset and gain

• Wide temperature range: –40°C to +125°C

• Packages: 6-mm × 6-mm 40-pin VQFN and 24-pin

HTSSOP

2 Applications

• Analog output module

• CPU (PLC controller)

• Flow transmitter

• Other sensor transmitter

• Actuator

• Process analytics (pH, gas, concentration, force

and humidity)

3 Description

The DAC7750 and DAC8750 (DACx750) are lowcost,

precision, fully-integrated, 12-bit and 16-bit

digital-to-analog converters (DACs) designed to

meet the requirements of industrial process-control

applications. These devices can be programmed as

a current output with ranges of 4 mA to 20 mA, 0 mA

to 20 mA, or 0 mA to 24 mA. The DACx750 include

reliability features such as CRC error checking on

the SPI frame, a watchdog timer, an open circuit,

compliance voltage, and thermal alarm. In addition,

the output current can be monitored by accessing an

internal precision resistor.

These devices include a power-on-reset function

designed to power up the device in a known state

(IOUT is disabled and in a Hi-Z state). The CLR pin

sets the current output to the low end of the range

if the output is enabled. Program the zero and gain

registers to digitally calibrate the device in the end

system. The output slew rate is also programmable by

register. These devices can superimpose an external

HART® signal on the current output, and operate with

a 10-V to 36-V supply.