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AD1819A

AC97 SoundPort Codec


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AD1819A pdf
a
AC ’97 SoundPort® Codec
AD1819A
AC '97 FEATURES
ENHANCED FEATURES
Fully Compliant AC ’97 Analog I/O Component
Support for Multiple Codec Communications
48-Terminal TQFP Package
DSP 16-Bit Serial Port Format
Multibit ⌺⌬ Converter Architecture for Improved
Variable 7 kHz to 48 kHz Sampling Rate with 1 Hz
S/N Ratio >90 dB
Resolution
16-Bit Stereo Full-Duplex Codec
Supports Modem Sample Rates and Filtering
Four Analog Line-Level Stereo Inputs for Connection
Phat™ Stereo 3D Stereo Enhancement
from LINE, CD, VIDEO and AUX
Two Analog Line-Level Mono Inputs for Speakerphone
and PC BEEP
Mono MIC Input Switchable from Two External
Sources
High Quality CD Input with Ground Sense
OStereo Line Level Output
Mono Output for Speakerphone
BPower Management Support
VHDL and Verilog Models of Serial Port Available
FUNCTIONAL BLOCK DIAGRAM
S CS0 CS1 CHAIN_IN CHAIN_CLK
OLEMIC1
MIC2
TELINE_IN
AD1819A
0dB/
20dB
MASTER/SLAVE
SYNCHRONIZER
AUX
PGA
16-BIT
⌺⌬ A/D
CONVERTER
CD
VIDEO
PHONE_IN
PGA
16-BIT
⌺⌬ A/D
CONVERTER
RESET
SYNC
LINE_OUT_L
MONO_OUT
LINE_OUT_R
MV
MV
MV
PC_BEEP
G
A
M
G GG G G
A AA A A
M MM M M
PHAT
STEREO
⌺⌺⌺⌺
PHAT
STEREO
⌺ ⌺⌺ ⌺ ⌺
A G = GAIN
M A = ATTENUATE
M = MUTE
MV = MASTER VOLUME
SAMPLE
RATE
GENERATORS
G 16-BIT
A ⌺⌬ D/A
M CONVERTER
G 16-BIT
A ⌺⌬ D/A
M CONVERTER
OSCILLATORS
XTALO XTALI
BIT_CLK
SDATA_OUT
SDATA_IN
SoundPort is a registered trademark of Analog Devices, Inc.
Phat is a trademark of Analog Devices, Inc.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998



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AD1819A pdf
AD1819A
PRODUCT OVERVIEW
Analog-to-Digital Signal Path
The AD1819A SoundPort Codec is designed to meet all require-
The selector sends left and right channel signals to the program-
ments of the Audio Codec ’97, Component Specification, Revision
mable gain amplifier (PGA). The PGA following the selector
1.03, © 1996, Intel Corporation, found at www.Intel.com. In
allows independent gain for each channel entering the ADC
addition, the AD1819A supports multiple codec configurations from 0 dB to +22.5 dB in 1.5 dB steps.
(up to three per AC-Link), a DSP serial mode, variable sample
rates, modem sample rates and filtering, and built-in Phat Ste-
reo 3D enhancement.
Each channel of the ADC is independent, and can process
left and right channel data at different sample rates. All pro-
grammed sample rates from 7 kHz to 48 kHz have a resolution
The AD1819A is an analog front end for high performance PC of 1 Hz. The AD1819A also supports irrational V.34 sample
audio, modem, or DSP applications. The AC ’97 architecture
rates.
defines a 2-chip audio solution comprising a digital audio con-
troller, plus a high quality analog component that includes
Sample Rates and D2S
The AD1819A default mode sets the codec to operate at 48 kHz
Digital-to-Analog Converters (DACs), Analog-to-Digital Con-
sample rates. The converter pairs may process left and right
verters (ADCs) mixer and I/O.
The main architectural features of the AD1819A are the high
quality analog mixer section, two channels of Σ∆ ADC conver-
sion, two channels of Σ∆ DAC conversion and Data Direct
Scrambling (D2S) rate generators. The AD1819A’s left channel
ADC and DAC are compatible for modem applications support-
Oing irrational sample rates and modem filtering requirements.
BFUNCTIONAL DESCRIPTION
SThis section overviews the functionality of the AD1819A and is
intended as a general introduction to the capabilities of the
Odevice. Detailed reference information may be found in the
descriptions of the Indexed Control Registers.
LAnalog Inputs
EThe codec contains a stereo pair of Σ∆ ADCs. Inputs to the
TADC may be selected from the following analog signals: tele-
Ephony (PHONE_IN), mono microphone (MIC1 or MIC2),
channel data at different sample rates. The AD1819A sample
rate generator allows the codec to instantaneously change and
process sample rates from 7 kHz to 48 kHz with a resolution of
1 Hz. The in-band integrated noise and distortion artifacts in-
troduced by rate conversions are below –90 dB. The AD1819A
uses a 4-bit D/A structure and Data Directed Scrambling (D2S)
to enhance noise immunity on motherboards and in PC enclo-
sures, and to suppress idle tones below the device’s quantization
noise floor. The D2S process pushes noise and distortion arti-
facts caused by errors in the multibit D/A conversion process to
frequencies beyond the audible range of the human ear and then
filters them.
Digital-to-Analog Signal Path
The analog output of the DAC may be gained or attenuated
from +12 dB to –34.5 dB in 1.5 dB steps, and summed with any
of the analog input signals. The summed analog signal enters
the Master Volume stage where each channel of the mixer out-
stereo line (LINE_IN), auxiliary line input (AUX), stereo CD
put may be attenuated from 0 dB to –46.5 dB in 1.5 dB steps or
ROM (CD), stereo audio from a video source (VIDEO) and
muted.
post-mixed stereo or mono line output (LINE_OUT).
Host-Based Echo Cancellation Support
Analog Mixing
The AD1819A supports time correlated I/O data format by
PHONE_IN, MIC1 or MIC2, LINE_IN, AUX, CD and
presenting mic data on the left channel of the ADC and the
VIDEO can be mixed in the analog domain with the stereo
mono summation of left and right output on the right channel.
output from the DACs. Each channel of the stereo analog in-
The ADC is splittable; left and right ADC data can be sampled
puts may be independently gained or attenuated from +12 dB
at different rates.
to –34.5 dB in 1.5 dB steps. The summing path for the mono
inputs (PHONE_IN, MIC1, and MIC2 to LINE_OUT) dupli-
cates mono channel data on both the left and right LINE_OUT.
Additionally, the PC attention signal (PC_BEEP) may be
mixed with the line output. A switch allows the output of the
DACs to bypass the Phat Stereo 3D enhancement.
Telephony Modem Support
The AD1819A contains a V.34-capable analog front end for
supporting host-based and data pump modems. The modem
DAC typical dynamic range is 90 dB over a 4.2 kHz analog
output passband where FS = 12.8 kHz. The left channel of the
ADC and DAC may be used to convert modem data at the same
sample rate in the range between 7 kHz and 48 kHz. All pro-
grammed sample rates have a resolution of 1 Hz. The AD1819A
supports irrational V.34 sample rates with 8/7 and 10/7 select-
able sample rate multiplier coefficients.
–2– REV. 0



Part Number AD1819A
Description AC97 SoundPort Codec
Maker Analog Devices - Analog Devices
Total Page 28 Pages
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