AD8842ANZ

Overview

The AD8842ANZ is an 8-bit, octal, 4-quadrant multiplying CMOS TrimDAC featuring eight independent channels. It utilizes a current conveyor amplifier to perform four-quadrant multiplication with constant input resistance, eliminating the need for external buffer amplifiers. The device operates from ±5 V supplies, providing ±3 V output swing and a 50 kHz full power bandwidth. It accepts a 12-bit serial data word via a 3-wire interface (CLK, SDI, LD) to update individual DAC registers. Key static accuracy specifications include ±1 LSB integral nonlinearity error and ±1 LSB differential nonlinearity. Power consumption is 95 mW at ±5 V.

Feature Summary

• Eight independent 8-bit digital-to-analog converter channels with 4-quadrant multiplying capability
• 50 kHz full power gain bandwidth for AC or DC signal adjustment
• 3-wire serial interface supporting daisy-chaining via SDO output pin
• Internal preset function forces all outputs to zero volts upon power-up

Applications

• Automatic adjustment systems requiring trimmer replacement
• Vertical deflection amplitude adjustment in video circuitry
• Waveform generation and modulation applications

Procurement Notes

Verify the package type matches the design requirements; the ANZ suffix indicates a 24-lead plastic DIP (N-24-1). Confirm RoHS compliance status if required by manufacturing standards. Ensure supply voltages are strictly maintained within the ±4.75 V to ±5.25 V range to meet electrical specifications. Check for ESD sensitivity during handling and storage.

Selection Notes

Select this component when replacing mechanical potentiometers in multi-channel designs. The 50 kHz bandwidth suits low-frequency AC signals; higher frequency applications may require the pin-compatible DAC8840. Ensure the microprocessor interface supports the required 12-bit serial word format and timing constraints. Verify that the load impedance allows for the specified ±3 mA output drive current without oscillation.

Part Context

The AD8842 is part of Analog Devices' TrimDAC family, designed to replace mechanical trimmers. It is pin-compatible with the DAC8840, which offers a higher 1 MHz multiplying bandwidth. The device integrates eight channels in a single 24-pin package, reducing board space compared to discrete solutions.

Replacement Considerations

The DAC8840 is a pin-compatible alternative offering increased bandwidth.