AD1851RZ-J

Overview

The AD1851RZ-J is a monolithic 16-bit PCM audio digital-to-analog converter (DAC) from Analog Devices, housed in a 16-lead Small Outline Integrated Circuit (SOIC) package. It operates on ±5 V supplies and integrates a voltage output amplifier, DAC, serial-to-parallel register, and voltage reference without requiring external components. The device features a 12.5 MHz maximum clock input frequency, supporting oversampling rates of 2x, 4x, 8x, and 16x. Key performance metrics include a signal-to-noise ratio of 110 dB and a total harmonic distortion plus noise (THD+N) of 0.004% at 0 dBFS. It offers ±3 V voltage output or ±1 mA current output capabilities with fast settling times.

Feature Summary

• 16-bit resolution providing 96 dB dynamic range
• 110 dB Signal-to-Noise Ratio (SNR)
• 0.004% THD+N at 0 dBFS for the -J grade
• Fast settling time of 1.5 μs permits 16x oversampling
• Optional linearity trim pin eliminates residual differential linearity error at midscale

Applications

• High-end compact disc players
• Digital audio amplifiers
• DAT recorders and players
• Synthesizers and keyboards

Procurement Notes

Verify that the -J suffix denotes the tighter THD+N specification (0.004%) compared to the standard grade. Confirm the SOIC-16 package type matches the PCB footprint requirements. Check for obsolete status as the datasheet indicates this revision may be discontinued.

Selection Notes

Select the AD1851RZ-J for designs requiring high-fidelity audio playback with low distortion. Ensure the system supports ±5 V power supplies and provides a serial 2's complement data interface compatible with second-generation digital filter chips. Consider the optional MSB adjustment circuit if ultra-low distortion at low signal amplitudes is critical.

Part Context

The AD1851 is part of the AD1851/AD1861 family of PCM audio DACs. It is pin-compatible with the AD1856 and AD1860, allowing it to serve as a drop-in replacement in existing designs using ±5 V supplies. The RZ suffix indicates the surface-mount SOIC package variant.

Replacement Considerations

Pin-compatible replacements include the AD1856 and AD1860 PCM audio DACs. Verify supply voltage compatibility (±5 V) and interface timing when substituting.