Features: `Single-Chip Integrated Digital Audio Stereo Codec
`Supports the Microsoft Windows Sound System*
`Multiple Channels of Stereo Input
`Analog and Digital Signal Mixing
`Programmable Gain and Attenuation
`On-Chip Signal Filters
Digital Interpolation and Decimation
Analog Output Low-Pass
`Sample Rates from 5.5 kHz to 48 kHz
`44-Lead PLCC and TQFP Packages
`Operation from +5 V Supplies
`Serial Digital Interface Compatible with ADSP-21xx Fixed-Point DSPPinout
Specifications
| PARAMETER |
Min |
Max |
UNIT |
Power Supplies
Digital (VDD)
Analog (VCC)
Input Current
(Except Supply Pins)
Analog Input Voltage (Signal Pins) (VA+)
Digital Input Voltage (Signal Pins(VD+)
Ambient Temperature (Operating)
Storage Temperature |
-0.3
-0.3
-0.3
-0.3
0
-65 |
6.0
6.0
±10.0
(VA+) + 0.3
(VD+) + 0.3
+70
+150 |
V
V
mA
V
V
|
*Stresses greater than those listed under "Absolute Maximum Ratings" may cause ermanent damage to the device. This is a stress rating only and functional peration of the device at these or any other conditions above those indicated in he operational section of this specification is not implied. Exposure to absolute aximum rating conditions for extended periods may affect device reliability.DescriptionThe AD1847 SoundPort® Stereo Codec integrates key audio ata conversion and control functions into a single integrated ircuit. The AD1847 is intended to provide a complete, low ost, single-chip solution for business, game audio and multimedia pplications requiring operation from a single +5 V supply.It provides a serial interface for implementation on a omputer motherboard, add-in or PCMCIA card. See Figure 1 or an example system diagram.
External circuit requirements are limited to a minimal number f low cost support components. Anti-imaging DAC output ilters are incorporated on-chip. Dynamic range exceeds 70 dB ver the 20 kHz audio band. Sample rates from 5.5 kHz to 8 kHz are supported from external crystals.
The Codec includes a stereo pair of analog-to-digital converters ADCs) and a stereo pair of digital-to-analog converters DACs). Inputs to the ADC can be selected from four tereo pairs of analog signals: line 1, line 2, auxiliary ("aux") ine #1, and post-mixed DAC output. A software-controlled rogrammable gain stage allows independent gain for each hannel going into the ADC. The ADCs' output can be digitally ixed with the DACs' input.
The pair of 16-bit outputs from the ADCs is available over a serial nterface that also supports 16-bit digital input to the DACs nd control/status information. The AD1847 can accept and enerate 16-bit twos-complement PCM linear digital data, 8-bit nsigned magnitude PCM linear data, and 8-bit m-law or A-law ompanded digital data.
The DACs are preceded by a digital interpolation filter. An ttenuator provides independent user volume control over each AC channel. Nyquist images are removed from the DACs' nalog stereo output by on-chip switched-capacitor and ontinuous-time filters. Two stereo pairs of auxiliary line-level nputs can also be mixed in the analog domain with the DAC utput.
The AD1847 serial data interface uses a Time Division Multiplex TDM) scheme that is compatible with DSP serial ports onfigured in Multi-Channel Mode with 32 16-bit time slots i.e., SPORT0 on the ADSP-2101, ADSP-2115, etc.).
AD1847 Data Sheet
