AD1851R-REEL7

Overview

The AD1851R-REEL7 is a monolithic 16-bit PCM audio digital-to-analog converter (DAC) from Analog Devices, packaged in a 16-pin Small Outline Integrated Circuit (SOIC). It operates on ±5 V power supplies and features an integrated voltage reference, output amplifier, and serial-to-parallel register. The device supports a maximum input clock frequency of 12.5 MHz, enabling data rates compatible with 2x, 4x, 8x, and 16x oversampling reconstruction filters. Key performance metrics include a signal-to-noise ratio (SNR) of 110 dB and total harmonic distortion plus noise (THD+N) of 0.008%. The unit provides both voltage output (±3 V) and current output (±1 mA) capabilities.

Feature Summary

• 16-bit resolution with 110 dB SNR and 0.008% THD+N
• Integrated voltage reference and output amplifier requiring no external components
• Serial 2's complement interface supporting up to 12.5 MHz clock rate
• Fast settling time of 1.5 μs for full-scale steps

Applications

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

Procurement Notes

Verify the obsolete status of this component prior to procurement. Confirm that the SOIC package variant matches the design requirements for pin-compatible replacements such as the AD1856 or AD1860 if applicable. Ensure supply chain sources provide valid traceability documentation for legacy analog devices.

Selection Notes

Select the AD1851R-REEL7 when a 16-bit resolution is sufficient for the application, as opposed to the 18-bit AD1861. The SOIC package is suitable for surface-mount assembly. Consider the optional MSB adjustment circuitry if super-linear performance at low signal amplitudes is required to minimize midscale differential linearity error.

Part Context

This component belongs to the AD1851/AD1861 family of PCM audio DACs. It is designed as a drop-in replacement for designs previously using the AD1856 or AD1860, sharing the same industry-standard 16-pin pinout. The device utilizes CMOS logic for digital functions and bipolar/MOS technology for analog sections.

Replacement Considerations

The AD1851R is pin-compatible with the AD1856 and AD1860 PCM audio DACs. Designers can substitute these parts directly in existing circuits utilizing ±5 V supplies without schematic modifications.