AD1845 is a single-chip integrated ∑∆ digital audio stereo codec that is compatible with Microsoft® and Windows® Sound System and supports MPC Level-2+ compliant mixing. It has a 16 mA bus drive capability, supports two DMA channels for full-duplex operation, has on-chip capture and playback FIFOs, has advanced power-down modes, programmable gain and attenuation, sample rates from 4.0 kHz to 50 kHz derived from a single clock or crystal input, 68-lead PLCC, 100-lead TQFP packages, operation from +5 V, and supplies byte-wide parallel interface to ISA and EISA buses. It is pin compatible with AD1848, AD1846, CS4248, and CS4231.
The AD1845 is a single‑chip integrated 16‑bit stereo audio codec that provides analog‑to‑digital and digital‑to‑analog conversion, programmable gain, mute, and advanced power‑down modes. It interfaces via a byte‑wide parallel bus to ISA/EISA computers and supports DMA or programmed I/O operation.
The document includes a product overview, detailed specifications, pin designations and functions, functional descriptions of analog and digital paths, timing parameters, power‑supply requirements, and package dimensions.
| Resolution (ADC) | 16 Bits |
|---|---|
| Input Impedance | 10‑17 kΩ |
| Sample Rate Range | 4.0 kHz to 50 kHz |
| Power Supply Range | 4.75 V to 5.25 V |
| Typical Power Supply Current | 130 mA |
| Package Options | 68‑Lead PLCC, 100‑Lead TQFP |
The AD1845 input impedance is specified as 10 kΩ to 17 kΩ.
The device is offered in 68‑lead PLCC and 100‑lead TQFP packages.
The codec supports sample rates from 4 kHz up to 50 kHz.