Overview
The AD1845JP, produced by Analog Devices Inc., is a Parallel-Port 16-Bit SoundPort Stereo Codec. This integrated circuit integrates key audio data conversion and control functions, providing a complete single-chip computer audio solution for business audio and multimedia applications. It includes stereo audio converters, complete on-chip filtering, MPC Level-2 compliant analog mixing, programmable gain, attenuation, and mute, along with a variable sample frequency generator and FIFOs. The AD1845 supports advanced power-down modes and provides a direct, byte-wide interface to both ISA and EISA computer buses, simplifying implementation on computer motherboards or add-in cards.
Key Specifications
| Parameter | Description |
|---|---|
| Resolution | 16-bit |
| Sample Rates | 4 kHz to 50 kHz |
| Supply Voltage | +5 V |
| Package | 68-Lead PLCC, 100-Lead TQFP |
| Bus Interface | Byte-wide parallel interface to ISA and EISA buses |
| Bus Drive Capability | 8/16 mA (user selectable), with optional 24 mA using external buffers |
| Data Formats | 16-bit twos complement PCM, 8-bit unsigned PCM, 8-bit µ-law, 8-bit A-law |
| DMA Support | Supports one or two DMA channels for full duplex operation |
| FIFOs | On-chip capture and playback FIFOs |
| Power-Down Modes | Advanced power-down modes for reduced power consumption |
Key Features
- Single-chip integrated ΣΔ digital audio stereo codec
- Microsoft® and Windows® Sound System compatible
- MPC Level-2+ compliant mixing
- Programmable gain and attenuation
- Software-controlled programmable gain stage for each channel
- Analog mixer allows mixing of various input signals with DAC outputs
- Digital interpolation filter and on-chip anti-imaging DAC output filters
- Dynamic range exceeds 80 dB over the 20 kHz audio band
- Supports multiple low power and power-down modes
Applications
The AD1845JP is designed for various audio and multimedia applications, including business audio, multimedia systems, and portable computing devices. Its advanced features and power management capabilities make it suitable for use in notebooks and other battery-powered devices. It is also applicable in add-in cards and motherboards for enhanced audio functionality.
Q & A
- What is the resolution of the AD1845JP?
The AD1845JP has a resolution of 16 bits.
- What are the supported sample rates for the AD1845JP?
The AD1845JP supports sample rates from 4 kHz to 50 kHz.
- What is the supply voltage for the AD1845JP?
The supply voltage for the AD1845JP is +5 V.
- What types of packages are available for the AD1845JP?
The AD1845JP is available in 68-Lead PLCC and 100-Lead TQFP packages.
- Does the AD1845JP support DMA operations?
Yes, the AD1845JP supports one or two DMA channels for full duplex operation.
- What data formats does the AD1845JP support?
The AD1845JP supports 16-bit twos complement PCM, 8-bit unsigned PCM, 8-bit µ-law, and 8-bit A-law data formats.
- Does the AD1845JP have built-in FIFOs?
Yes, the AD1845JP includes on-chip capture and playback FIFOs.
- What power management features does the AD1845JP offer?
The AD1845JP supports advanced power-down modes to reduce power consumption, making it suitable for portable applications.
- Is the AD1845JP compatible with Microsoft and Windows Sound Systems?
Yes, the AD1845JP is compatible with Microsoft and Windows Sound Systems.
- What is the dynamic range of the AD1845JP?
The dynamic range of the AD1845JP exceeds 80 dB over the 20 kHz audio band.
