AD7243 Datasheet | Analog Devices

FEATURES 12-Bit CMOS DAC with On-Chip Voltage Reference Output Amplifier Three Selectable Output Ranges - 5 V to +5 V, 0 V to +5 V, 0 V to +10 V Serial Interface 300 k Hz DAC Update Rate Small Size: 16-Lead DIP or SOIC Nonlinearity: ؎1/2 LSB T MIN to T MAX Low Power Dissipation: 100 m W Typical APPLICATIONS Process Control Industrial Automation Digital Signal Processing Systems Input/Output Ports REFOUT LC2MOS 12-Bit Serial DACPORT AD7243 FUNCTIONAL BLOCK DIAGRAM 2R R OFS 2R VOUT 12 - BIT DAC REFIN 12 AGND DAC LATCH 12 DGND INPUT SHIFT REGISTER VSS SDIN CLR BIN/ SCLK SYNC LDAC DCEN SDO P GENERAL DESCRIPTION The AD7243 is a plete 12-bit, voltage output, digital-toanalog converter with output amplifier and Zener voltage reference on a monolithic CMOS chip. No external trims are required to achieve full specified performance. The output amplifier is capable of developing +10 V across a 2 kΩ load. The output voltage ranges with single supply operation are 0 V to +5 V or 0 V to +10 V, while an additional bipolar ± 5 V output range is available with dual supplies. The ranges are selected using the internal gain resistor. The data format is natural binary in both unipolar ranges, while either offset binary or two’s plement format may be selected in the bipolar range. A CLR function is provided which sets the output to 0 V in both unipolar ranges and in the two’s plement bipolar range, while with offset binary data format, the output is set to - REFIN. This function is useful as a power-on reset as it allows the output to be set to a known voltage level. The AD7243 features a fast versatile serial interface which allows easy connection to both microputers and 16-bit digital signal processors with serial ports. The serial data may be applied at rates up to 5 MHz allowing a DAC update rate of 300 k Hz. A serial data output capability is also provided which allows daisy chaining in multi-DAC systems. This feature allows any number of DACs to be used in a...