AD1861N

Digital To Analog Converters Overview

The AD1861N is an obsolete monolithic 18-bit, 16x Fs PCM audio DAC from Analog Devices. It integrates a voltage output amplifier, DAC, serial-to-parallel register, and voltage reference within a 16-pin plastic DIP package. The device operates on ±5 V supplies with typical power dissipation of 100 mW. Key electrical specifications include a signal-to-noise ratio (SNR) of 110 dB, a dynamic range of 108 dB, and a maximum clock input frequency of 13.5 MHz. It supports serial 2's complement data input and offers pin compatibility with the AD1856 and AD1860.

Digital To Analog Converters Feature Summary

• 18-bit resolution providing 108 dB dynamic range
• 110 dB Signal-to-Noise Ratio (SNR)
• Fast settling time of 1.5 μs for a 6 V step
• Optional linearity trim pin to eliminate residual differential linearity error at midscale
• Pin-compatible with AD1856 and AD1860 PCM audio DACs

Digital To Analog Converters Applications

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

Digital To Analog Converters Procurement Notes

The AD1861N is classified as OBSOLETE by Analog Devices. Verification of current availability requires checking authorized distributors or secondary market suppliers. As an ESD-sensitive device, handling must follow electrostatic discharge precautions. Ensure the specific N suffix corresponds to the 16-pin Plastic DIP package variant when sourcing replacements.

Digital To Analog Converters Selection Notes

Select the AD1861N for designs requiring 18-bit audio conversion with a serial interface compatible with second-generation digital filter chips. It is suitable for drop-in replacement in existing designs using AD1856 or AD1860 components that utilize ±5 V supplies. Consider the optional MSB adjustment circuit if low-distortion reproduction of low-amplitude signals is critical.

Digital To Analog Converters Part Context

The AD1861N belongs to the AD1851/AD1861 family of monolithic PCM audio DACs. While the AD1851 provides 16-bit resolution, the AD1861 offers enhanced 18-bit performance. Both devices share identical pinouts and functional blocks, differing primarily in resolution and maximum clock frequency (12.5 MHz for AD1851 vs. 13.5 MHz for AD1861).

Digital To Analog Converters Replacement Considerations

The datasheet confirms pin compatibility with the AD1856 and AD1860 PCM audio DACs. These parts serve as direct functional substitutes in designs utilizing ±5 V supplies.