AD1851RZ

Overview

The AD1851RZ 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 integrates a voltage output amplifier, DAC, serial-to-parallel register, and voltage reference without requiring external components. The device operates on ±5 V supplies with a typical power dissipation of 100 mW. Key electrical specifications include a signal-to-noise ratio (SNR) of 110 dB, a dynamic range of 96 dB, and a maximum input clock frequency of 12.5 MHz. It supports serial 2's complement data input and features fast settling times to enable high oversampling rates.

Feature Summary

• 16-bit resolution providing 96 dB dynamic range and 110 dB SNR
• Integrated voltage output amplifier capable of ±3 V swing at up to 8 mA load current
• Fast settling time of 1.5 μs for a 6 V step, supporting 16x oversampling
• Optional TRIM pin allows elimination of 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 component status as the datasheet marks the AD1851/AD1861 series as OBSOLETE. Confirm availability through authorized distributors or secondary market sources. Ensure the SOIC package variant matches the required surface mount footprint. Check RoHS compliance details if environmental regulations apply to the specific manufacturing lot.

Selection Notes

Select the AD1851RZ for designs requiring a drop-in replacement for the AD1856 or AD1860 in ±5 V supply systems due to pin compatibility. Choose this model over the AD1861 if 16-bit resolution is sufficient, as the AD1861 offers 18-bit resolution but requires a higher maximum clock rate of 13.5 MHz compared to the AD1851's 12.5 MHz limit.

Part Context

The AD1851RZ belongs to the AD1851/AD1861 family of high-performance audio DACs. It is designed to be pin-compatible with the earlier AD1856 and AD1860 models, facilitating easy upgrades in existing hardware architectures. The 'R' suffix denotes the 16-pin plastic SOIC surface-mount package, while the 'N' suffix indicates the plastic DIP package.

Replacement Considerations

The AD1851RZ is explicitly documented as a pin-compatible drop-in replacement for the AD1856 and AD1860 PCM audio DACs when operating with ±5 V supplies. No functional changes are required for direct substitution in compatible circuits.