AD7834ARZ

Overview

The AD7834ARZ is a monolithic quad 14-bit digital-to-analog converter (DAC) from Analog Devices, utilizing LC2MOS technology. It features four independent voltage-output DACs with a maximum output span of 14 V and a range of ±8.192 V. The device employs serial data loading via DIN, SCLK, and FSYNC pins, supporting up to 32 individually addressable units through five dedicated package address pins (PA0–PA4). Key specifications include a typical settling time of 10 µs, an R-2R architecture, and power-on reset functionality that holds outputs within ±2 V of the Device Sense Ground (DSG) potential during supply stabilization.

Feature Summary

• Quad 14-bit resolution with ±8.192 V output range and 14 V maximum span
• Serial input interface (DIN, SCLK, FSYNC) with user-assigned addressing for multi-device systems
• LC2MOS architecture ensuring monotonicity and low glitch impulse (120 nV-s)
• Asynchronous CLR input allows forcing all outputs to the DSG pin potential

Applications

• Process control systems requiring multi-channel analog generation
• Automatic test equipment (ATE) for signal simulation
• General-purpose instrumentation involving precise voltage references

Procurement Notes

Verify component authenticity as the AD7834 series has reached End-of-Life (EOL) status per manufacturer Product Change Notices. Current availability may be limited to surplus stock or alternative packaging variants such as the AD7834ARZ-REEL. Confirm lead times and lot dates carefully due to discontinuation. Ensure compatibility with existing board layouts when sourcing from third-party distributors.

Selection Notes

Select the AD7834ARZ for applications requiring four isolated 14-bit channels in a single package. Choose this model over the parallel-input AD7835 if system design prioritizes reduced pin count and simplified serial bus interfacing. Verify that the required reference voltage span falls within the 5 V to 14 V range for specified performance. Ensure the operating temperature range (-40°C to +85°C) meets environmental constraints.

Part Context

The AD7834ARZ belongs to the AD7834/AD7835 family of LC2MOS DACs. While the AD7835 offers parallel loading capabilities, the AD7834 is specifically designed for serial data streams. The 'ARZ' suffix indicates a 28-lead SOIC surface-mount package with lead-free composition. This part serves as a high-density solution for replacing multiple discrete DACs in compact industrial designs.

Replacement Considerations

Direct replacement options are limited due to EOL status. The AD7834ARZ is the RoHS-compliant version of the discontinued AD7834AR. No functional equivalents with identical pinouts and serial interfaces are currently listed by the manufacturer.