AD7846-CHIPS Datasheet | Analog Devices

FEATURES - 16-bit monotonicity over temperature - Microprocessor patible with read-back capability - Unipolar or bipolar output - Multiplying capability - Low power dissipation: 100 m W typical APPLICATIONS - Instrumentation - Automatic test equipment - Industrial automation - Energy grid systems - Aerospace GENERAL DESCRIPTION The AD7846-CHIPS is a 16-bit digital-to-analog converter (DAC) constructed with the Analog Devices, Inc., LC2MOS process. The device has VREF+ and VREF- reference inputs and an on-chip output amplifier that can be configured to give a unipolar output range (0 V to +5 V or 0 V to +10 V) or bipolar output ranges (±5 V or ±10 V). The DAC uses a segmented architecture. The four MSBs in the DAC latch select one of the segments in a 16-resistor string. Both taps of the segment are buffered by amplifiers and fed to a 12-bit DAC, which provides a further 12 bits of resolution. This architecture ensures 16-bit monotonicity. Excellent integral linearity results from tight matching between the input offset voltages of the two buffer amplifiers. FUNCTIONAL BLOCK DIAGRAM Data Sheet AD7846-CHIPS LC2MOS 16-Bit Voltage Output DAC In addition to the excellent accuracy specifications, the AD7846CHIPS also offers a prehensive microprocessor interface. There are 16 data input and output pins, plus control lines (CS, R/W, LDAC, and CLR). R/W and CS allow writing to and reading from the input and output latch, and this read-back function is useful in ATE applications. LDAC allows simultaneous updating of DACs in a multi DAC system, and the CLR line resets the contents of the DAC latch to 00 … 000 or 10 … 000 depending on the state of R/W, which means that the DAC output can be reset to 0 V in both unipolar and bipolar configurations. Additional application and technical information can be found in the AD7846 data sheet. PRODUCT HIGHLIGHTS 1. 16-Bit Monotonicity. The guaranteed 16-bit monotonicity over temperature makes the AD7846-CHIPS ideal for closed-loop...