AD7233

a FEATURES 12-Bit CMOS DAC with On-Chip Voltage Reference Output Amplifier –5 V to +5 V Output Range Serial Interface 300 kHz DAC Update Rate Small Size: 8-Pin Mini-DIP Nonlinearity: ؎ 1/2 LSB TMIN to TMAX Low Power Dissipation: 100 mW typ APPLICATIONS Process Control Industrial Automation Digital Signal Processing Systems Input/Output Ports LC2MOS 12-Bit Serial Mini-DIP DACPORT AD7233 FUNCTIONAL BLOCK DIAGRAM VDD 2R 2R VOUT 12-BIT DAC 12 DAC LATCH GND AD7233 12 INPUT SHIFT REGISTER VSS GENERAL DESCRIPTION SDIN SCLK SYNC LDAC The AD7233 is a complete 12-bit, voltage-output, digital-toanalog converter with output amplifier and Zener voltage reference all in an 8-lead package. No external trims are required to achieve full specified performance. The data format is two’s complement, and the output range is –5 V to +5 V. The AD7233 features a fast, versatile serial interface which allows easy connection to both microcomputers and 16-bit digital signal processors with serial ports. When the SYNC input is taken low, data on the SDIN pin is clocked into the input shift register on each falling edge of SCLK. On completion of the 16-bit data transfer, bringing LDAC low updates the DAC latch with the lower 12 bits of data and updates the output. Alternatively, LDAC can be tied permanently low, and in this case the DAC register is automatically updated with the contents of the shift register when all sixteen data bits have been clocked in. The serial data may be applied at rates u...