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AD1819B

AC97 SoundPort Codec



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AD1819B pdf
a
AC’97 SoundPort® Codec
AD1819B
AC’97 FEATURES
Fully Compliant AC’97 Analog I/O Component
48-Terminal LQFP Package
Multibit ⌺⌬ Converter Architecture for Improved
S/N Ratio >90 dB
16-Bit Stereo Full-Duplex Codec
Four Analog Line-Level Stereo Inputs for Connection
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
Stereo Line Level Output
Mono Output for Speakerphone
Power Management Support
ENHANCED FEATURES
Support for Multiple Codec Communications
DSP 16-Bit Serial Port Format
Variable 7 kHz to 48 kHz Sampling Rate with 1 Hz
Resolution
Supports Modem Sample Rates and Filtering
Phat™ Stereo 3D Stereo Enhancement
VHDL and Verilog Models of Serial Port Available
FUNCTIONAL BLOCK DIAGRAM
CS0 CS1 CHAIN_IN CHAIN_CLK
MIC1
MIC2
LINE_IN
AUX
CD
VIDEO
PHONE_IN
LINE_OUT_L
MONO_OUT
LINE_OUT_R
PC_BEEP
AD1819B
0dB/
20dB
G
A
M
G GG G G
A AA A A
M MM M M
MV
PHAT
STEREO
⌺⌺⌺⌺
MV
MV
PHAT
STEREO
⌺ ⌺⌺ ⌺ ⌺
A G = GAIN
M A = ATTENUATE
M = MUTE
MV = MASTER VOLUME
MASTER/SLAVE
SYNCHRONIZER
PGA
16-BIT
⌺⌬ A/D
CONVERTER
PGA
16-BIT
⌺⌬ A/D
CONVERTER
SAMPLE
RATE
GENERATORS
G 16-BIT
A ⌺⌬ D/A
M CONVERTER
G 16-BIT
A ⌺⌬ D/A
M CONVERTER
OSCILLATORS
XTALO XTALI
RESET
SYNC
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., 1999



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AD1819B pdf
AD1819B
PRODUCT OVERVIEW
The AD1819B SoundPort Codec is designed to meet all require-
ments of the Audio Codec ’97, Component Specification, Revision
1.03, © 1996, Intel Corporation, found at www.Intel.com. In
addition, the AD1819B supports multiple codec configurations
(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.
The AD1819B is an analog front end for high performance PC
audio, modem, or DSP applications. The AC’97 architecture
defines a 2-chip audio solution comprising a digital audio con-
troller, plus a high quality analog component that includes
Digital-to-Analog Converters (DACs), Analog-to-Digital Con-
verters (ADCs) mixer and I/O.
The main architectural features of the AD1819B 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 AD1819B’s left channel
ADC and DAC are compatible for modem applications support-
ing irrational sample rates and modem filtering requirements.
FUNCTIONAL DESCRIPTION
This section overviews the functionality of the AD1819B and is
intended as a general introduction to the capabilities of the
device. Detailed reference information may be found in the
descriptions of the Indexed Control Registers.
Analog Inputs
The codec contains a stereo pair of Σ∆ ADCs. Inputs to the
ADC may be selected from the following analog signals: tele-
phony (PHONE_IN), mono microphone (MIC1 or MIC2),
stereo line (LINE_IN), auxiliary line input (AUX), stereo CD
ROM (CD), stereo audio from a video source (VIDEO) and
post-mixed stereo or mono line output (LINE_OUT).
Analog Mixing
PHONE_IN, MIC1 or MIC2, LINE_IN, AUX, CD and
VIDEO can be mixed in the analog domain with the stereo
output from the DACs. Each channel of the stereo analog in-
puts may be independently gained or attenuated from +12 dB
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.
Analog-to-Digital Signal Path
The selector sends left and right channel signals to the program-
mable gain amplifier (PGA). The PGA following the selector
allows independent gain for each channel entering the ADC
from 0 dB to +22.5 dB in 1.5 dB steps.
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
of 1 Hz. The AD1819B also supports irrational V.34 sample
rates.
Sample Rates and D2S
The AD1819B default mode sets the codec to operate at 48 kHz
sample rates. The converter pairs may process left and right
channel data at different sample rates. The AD1819B 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 AD1819B
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-
put may be attenuated from 0 dB to –46.5 dB in 1.5 dB steps or
muted.
Host-Based Echo Cancellation Support
The AD1819B supports time correlated I/O data format by
presenting mic data on the left channel of the ADC and the
mono summation of left and right output on the right channel.
The ADC is splittable; left and right ADC data can be sampled
at different rates.
Telephony Modem Support
The AD1819B 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 AD1819B
supports irrational V.34 sample rates with 8/7 and 10/7 select-
able sample rate multiplier coefficients.
Differences Between the AD1819A and AD1819B
The voltage reference (VREF) of the AD1819B remains active
while RESET is asserted. This eliminates the audible artifacts
associated with the RESET LO to HI transitions that can
occur during a Windows boot (power-up) or Windows warm
restart (reset).
–2– REV. 0



Part Number AD1819B
Description AC97 SoundPort Codec
Maker Analog Devices - Analog Devices
Total Page 28 Pages
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