AD8842ARZ-REEL

Overview

The AD8842ARZ-REEL is an eight-channel, 8-bit, 4-quadrant multiplying CMOS TrimDAC in a 24-pin SOIC_W package. It replaces mechanical trimmers with digitally controlled voltage adjustment. The device features a 50 kHz full power gain bandwidth and supports ±3 V output swings from ±5 V supplies. Key electrical parameters include a maximum integral nonlinearity of ±1 LSB, a typical input resistance of 19 kΩ, and a power dissipation of 95 mW at ±5 V. It utilizes a 3-wire serial interface for data loading.

Feature Summary

• Eight independent channels with 4-quadrant multiplying capability for signal inversion and modulation
• 50 kHz full power gain bandwidth suitable for AC or DC gain control up to 50 kHz
• 3-wire serial interface with daisy-chaining support via SDO pin
• Internal preset function forces all outputs to zero volts upon power-up

Applications

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

Procurement Notes

Verify the REEL suffix indicates tape-and-reel packaging for automated assembly. Confirm RoHS compliance status associated with the Z suffix. Ensure supply voltages match the required ±5 V specification for optimal performance within the stated operating temperature range.

Selection Notes

Select this component when multiple independent analog signal paths require digital programmability. The 8-bit resolution provides sufficient precision for general-purpose trimming. Consider the 19 kΩ input resistance for source impedance matching. Verify that the 50 kHz bandwidth meets the highest frequency requirements of the application signals.

Part Context

This part belongs to the AD8842 family of multiplying DACs. It is pin-compatible with the DAC8840 but offers a lower 50 kHz bandwidth compared to the 1 MHz variant. The device integrates current conveyor amplifiers to simplify the four-quadrant multiplication architecture typically requiring multiple external op-amps.

Replacement Considerations

The DAC8840 is a confirmed pin-compatible substitute offering higher bandwidth. For single-supply applications, the DAC-8841 is recommended as it operates on a single 5 V supply instead of dual rails.