AD7834BN

Overview

The AD7834BN is a quad 14-bit digital-to-analog converter (DAC) manufactured by Analog Devices Inc. It utilizes LC2MOS technology and features serial data loading via DIN, SCLK, and FSYNC pins. The device provides four buffered voltage outputs with a maximum span of 14 V and a range of ±8.192 V. It operates on dual analog supplies (VDD/VSS) ranging from ±11.4 V to ±15.75 V and a single 5 V logic supply (VCC). Key specifications include a typical settling time of 10 µs, relative accuracy of ±1 LSB (B grade), and differential nonlinearity of ±0.9 LSB max. The component is housed in a 28-lead PDIP package.

Feature Summary

• Quad 14-bit resolution with R-2R segmented architecture
• Serial interface supporting up to 32 devices via dedicated address pins (PA0-PA4)
• Asynchronous clear function to user-defined voltage via DSG pin
• Power-on reset holds outputs within ±2 V of DSG potential during supply stabilization

Applications

• Process control systems
• Automatic test equipment
• General-purpose instrumentation

Procurement Notes

Verify the specific B-grade performance parameters against project requirements, noting the ±1 LSB relative accuracy limit. Confirm that the 28-lead PDIP package aligns with the target PCB footprint. Ensure power supply sequencing adheres to absolute maximum ratings to prevent latch-up, particularly regarding the relationship between VCC and VDD. Check for end-of-life status or obsolescence notices prior to finalizing procurement plans.

Selection Notes

Select the AD7834BN when a serial interface is preferred over parallel options like the AD7835. The B-grade variant offers tighter relative accuracy (±1 LSB) compared to the A-grade (±2 LSB). Ensure the application can accommodate the required dual analog supply rails (up to ±15 V) and the 5 V logic level. Consider the 10 µs settling time for bandwidth limitations in high-speed signal generation scenarios.

Part Context

The AD7834 belongs to the AD7834/AD7835 family of LC2MOS DACs. While the AD7835 supports parallel loading, the AD7834 is optimized for serial bus integration. The 'BN' suffix indicates the B-grade accuracy version packaged in a 28-lead PDIP format. This part shares architectural similarities with other industry DACs but is distinct in its specific serial addressing and LC2MOS construction.

Replacement Considerations

Direct functional replacements may include the AD7834ANZ (A-grade, same package) or AD7834ARZ (A-grade, SOIC package). Verify pin compatibility and electrical tolerances, as the B-grade specification differs from the A-grade. No other direct substitutes are confirmed in the provided documentation.