AD1955 is a high performance multibit sigma-delta DAC chip launched by AD company, supporting 24-bit 192kHz PCM audio data and SACD audio data.
The AD1955 from Analog Devices is a single‑chip, stereo digital audio playback system that includes a multibit sigma‑delta modulator, digital interpolation filters, and continuous‑time differential current output DACs. It supports 16‑ to 24‑bit data, sample rates from 32 kHz up to 192 kHz, and SACD bit‑stream playback, making it suitable for high‑end DVD‑Audio, home‑theater, automotive, and professional audio applications.
The datasheet provides comprehensive electrical specifications, pin‑out details, timing diagrams, and package information. Key performance figures include a 123 dB mono signal‑to‑noise ratio, –110 dB THD+N, and a differential output range of 8.64 mA p‑p, all powered from a 5 V supply. The device is supplied in a 28‑lead SSOP package and includes on‑chip click‑less volume control and mute functions.
| Signal‑to‑Noise Ratio (Mono) | 123 dB |
|---|---|
| Analog Supply Voltage | 5 V |
| Digital Supply Voltage | 5 V |
| Differential Output Range | 8.64 mA p‑p |
| Maximum Sample Rate | 192 kHz |
| Package Type | 28‑Lead SSOP |
The AD1955 operates from a 5 V analog and a 5 V digital supply.
The mono output achieves a signal‑to‑noise ratio of 123 dB.
The device is supplied in a 28‑lead shrink small‑outline package (SSOP).
The AD1955 is guaranteed to operate from –40 °C to +85 °C.