AD7835APZ-REEL

Overview

The AD7835APZ-REEL is a quad 14-bit digital-to-analog converter (DAC) from Analog Devices, utilizing LC2MOS technology. It integrates four independent DAC channels within a single monolithic chip, featuring parallel data loading capabilities with support for both 14-bit straight binary and double-byte (8-bit/6-bit) formats. The device provides voltage outputs with a maximum span of 14 V, typically ranging from ±8.192 V. Key functional features include a power-on reset function that holds outputs near the device sense ground potential during supply stabilization, an asynchronous clear input for user-defined voltage setting, and simultaneous or individual channel updates via the LDAC signal.

Feature Summary

• Quad 14-bit DAC architecture with parallel 8-bit or 14-bit data loading interfaces
• Voltage output range up to ±8.192 V with a maximum span of 14 V
• Asynchronous CLR input allows forcing all outputs to the Device Sense Ground (DSG) potential
• Power-on reset circuitry maintains outputs within ±2 V of DSG until supplies stabilize

Applications

• Process control systems requiring multi-channel analog output
• Automatic test equipment for precise signal generation
• General-purpose instrumentation involving high-resolution voltage control

Procurement Notes

Verify the package type corresponds to the 'PZ' suffix, which indicates a 44-lead MQFP package, as the AD7835 family includes other options like PLCC. Confirm the 'REEL' designation matches the required tape-and-reel quantity for manufacturing integration. Ensure the temperature grade ('A') aligns with the operational environment requirements of -40°C to +85°C.

Selection Notes

Select the AD7835 over the AD7834 when a parallel interface is preferred over serial loading to simplify microprocessor interfacing without additional shift registers. Consider the 44-lead MQFP package constraints regarding PCB real estate and thermal dissipation. Verify that the system can provide the necessary dual analog supplies (typically ±15 V or ±12 V) and a separate 5 V logic supply for proper operation.

Part Context

The AD7835 is part of the AD7834/AD7835 family of LC2MOS quad DACs manufactured by Analog Devices. While the AD7834 utilizes a serial input interface, the AD7835 variant is designed for parallel data entry, offering flexibility in system bus architectures. Both devices share identical core DAC performance characteristics, including 14-bit resolution and monotonicity, but differ primarily in their digital input configuration and pinout assignments.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.