The DAC8426 is a complete quad voltage output D/A converter with internal reference. This product fits directly into any existing 7226 socket where the user currently has a 10 V external reference. The external reference is no longer necessary. The internal reference of the DAC8426 is laser-trimmed to ±0.4%offering a 25 ppm/°C temperature coefficient and 5 mA of external load driving capability. The DAC8426 contains four 8-bit voltage-output CMOS D/A converters on a single chip. A 10 V output bandgap reference sets the output full-scale voltage. The circuit also includes four input latches and interface control logic. One of the four latches， selected by the address inputs， is loaded from the 8-bit data bus input when the write strobe is active low. All digital inputs are TTL/CMOS （5 V） compatible. The on-board amplifiers can drive up to 10 mA from either a single or dual supply. The on-board reference that is always connected to the internal DACs has 5 mA available to drive external devices. Its compact size， low power， and economical cost-per-channel， make the DAC8426 attractive for applications requiring multiple D/A converters without sacrificing circuit-board space. System reliability is also increased due to reduced parts count. PMI’s advanced oxide-based， silicon-gate， CMOS process allows the DAC8426’s analog and digital circuitry to be manufactured on the same chip. This， coupled with PMI’s highly stable thin-film R-2R resistor ladder， aids in matching and temperature tracking between DACs.