AD1995 Datasheet
High Performance Multibit Σ-Δ DAC with SACD Playback
High Performance Multibit Σ-Δ DAC with SACD Playback
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The AD1955 is a complete, high performance, single-chip, stereo digital audio playback system. It is comprised of a multibit sigmadelta modulator, high performance digital interpolation filters, and continuous-time differential current output DACs. Other features include an on-chip clickless stereo attenuator and mute capability, programmed through an SPI compatible serial control port. The AD1955 is fully compatible with all known DVD audio formats including 192 kHz as well as 96 kHz sample frequencies and 24 bits. It is also backward compatible by supporting 50 µs/ 15 µs digital de-emphasis intended for “redbook” compact discs, as well as de-emphasis at 32 kHz and 48 kHz sample rates.
The AD1955 has a very flexible serial data input port that allows for glueless interconnection to a variety of ADCs, DSPs, SACD decoders, external digital filters, AES/EBU receivers, and sample rate converters. The AD1955 can be configured in leftjustified, I2S, right-justified, or DSP serial port compatible modes. It can support MSB first, twos complement format, 16, 18, 20, and 24 bits in all standard PCM modes. The AD1955 also has an interface for SACD playback and an external digital filter interface for use with an external digital interpolation filter or HDCD decoder. The AD1955 uses a 5 V power supply. It is fabricated on a single monolithic integrated circuit and is housed in a 28-lead SSOP package for operation over the temperature range –40°C to +85°C.