AD5748

The AD5748 targets applications in PLC and industrial process control. The analog input to the AD5748 is provided from a low voltage, single-supply, digital-to-analog converter (DAC)and is internally conditioned to provide the desired output current/voltage range. The AD5748 is a single-channel, low cost, precision, voltage/ current output driver with hardware or software programmable output ranges. The software ranges are configured via an SPI-/ MICROWIRE--compatible serial interface. The analog input range is 0 V to 4.096 V. An HW SELECT pin is used to configure the part for hardware or software mode on power-up. Note that the plots in the Typical Performance Characteristics section of this data sheet contain information on the standard ranges, as released in the AD5750/AD5750-1 data sheet. Although the overranges have been tested, new plots were not generated and substitution data was used for plotting purposes. The flexible serial interface is SPI- and MICROWIRE-compatible and can be operated in 3-wire mode to minimize the digital isolation required in isolated applications. The interface also features an optional PEC error checking feature using CRC-8 error checking, useful in industrial environments where data communication corruption can occur. The device also includes a power-on-reset function, ensuring that the device powers up in a known state (0 V or tristate), and a asynchronous CLEAR pin that sets the outputs to zero scale/midscale voltage output or the low end of the selected current range. The output current range is programmable across two current ranges: 4 mA to 21 mA and 0 mA to 21 mA. Voltage output is provided from a separate pin that can be configured to provide 0 V to 5 V, 0 V to 10.5 V, or ±10.5 V output range. Analog outputs are short-circuit and open-circuit protected and can drive capacitive loads of 2 F and inductive loads of 0.1 H. The device is specified to operate with a power supply range from ±12 V to ±24 V. Output loop compliance is 0 V to AV DD 2.75 V.

The features of AD5748 can be summarized as (1)current output ranges: 4 mA to 21 mA, 0 mA to 21 mA ±0.15% FSR total unadjusted error (TUE)/ ±5 ppm/°C FSR typical output drift; (2)voltage output ranges: 0 V to 5 V, 0 V to 10.5 V, ±10.5 V ±0.05% FSR total unadjusted error (TUE)/ ±3 ppm/°C FSR output drift; (3)flexible serial digital interface; (4)on-chip output fault detection; (5)PEC error checking; (6)asynchronous CLEAR function; (7)flexible power-up condition to 0 V or tristate; (8)power supply range AV DD: +12 V (± 10%)to +24 V (± 10%)/ AV SS: -12 V (± 10%)to -24 V (± 10%); (9)output loop compliance to AV DD -2.75 V; (10)temperature range: -40°C to +105°C; (11)32-lead, 5 mm * 5 mm LFCSP package.

The absolute maximum ratings of AD5748 are (1)AVDD to GND: -0.3 V to +30 V; (2)AVSS to GND: +0.3 V to -28 V; (3)AVDD to AVSS: -0.3 V to +58 V; (4)DVCC to GND: -0.3 V to +7 V; (5)VSENSE+ to GND: AVSS to AVDD; (6)VSENSEto GND: ±5.0 V; (7)digital inputs to GND: -0.3 V to DV CC + 0.3 V or 7 V (whichever is less); (8)digital outputs to GND: -0.3 V to DV CC + 0.3 V or 7 V (whichever is less); (9)VREF to GND: -0.3 V to +7 V; (10)VIN to GND: -0.3 V to +7 V; (11)VOUT, IOUT to GND: AVSS to AVDD; (12)operating temperature range, industrial: -40°C to +105°C; (13)storage temperature range: -65°C to +150°C; (14)junction temperature (T J max): 125°C; (15)32-Lead LFCSP Package JA thermal impedance: 28°C/W; (16)lead temperature JEDEC industry standard soldering: J-STD-020/ ESD (Human Body Model): 3 kV.