The AD7846KP is a 16-bit DAC constructed with the Analog Devices, Inc., LC2MOS process. It has VREF+ and VREF− reference inputs and an on-chip output amplifier. These can be configured to give a unipolar output range (0 V to +5 V, 0 V to +10 V) or bipolar output ranges (±5 V, ±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.
In addition to the excellent accuracy specifications, the AD7846KP also offers a comprehensive microprocessor interface. There are 16 data I/O pins, plus control lines (CS, R/W, LDAC and CLR). R/W and CS allow writing to and reading from the I/O latch.
This is the readback function, which is useful in ATE applications. LDAC allows simultaneous updating of DACs in a multi-DAC system and the CLR line will reset the contents of the DAC latch to 00…000 or 10…000 depending on the state of R/W.
This means that the DAC output can be reset to 0 V in both the unipolar and bipolar configurations.
The AD7846KP is available in 28-lead plastic, ceramic, and PLCC packages.
Product Highlights
Feature
- 16-bit monotonicity over temperature
- ±2 LSBs integral linearity error
- Microprocessor compatible with readback capability
- Unipolar or bipolar output
- Multiplying capability
- Low power (100 mW typical)
(Picture: Pinout)
