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Analog Devices Semiconductor Electronic Components Datasheet



AD1885

AC97 SoundMAX Codec



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AD1885 pdf
a
AC’97 SoundMAX® Codec
AD1881A
AC’97 2.1 FEATURES
ENHANCED FEATURES
Variable Sample Rate
Mobile Low Power Mixer Mode
True Line-Level Output
Digital Audio Mixer Mode
Supports Secondary Codec Modes
Full Duplex Variable 8 kHz to 48 kHz Sampling Rate
AC’97 FEATURES
Designed for AC’97 Analog I/O Component
48-Lead LQFP Package
Multibit ⌺⌬ Converter Architecture for Improved
S/N Ratio Greater than 90 dB
with 1 Hz Resolution
PHAT™ Stereo 3D Stereo Enhancement
Split Power Supplies (3.3 V Digital/5 V Analog)
Extended 6-Bit Master Volume Control
Audio Amp Power-Down Signal
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 or Internal Speaker
Power Management Support
FUNCTIONAL BLOCK DIAGRAM
CS0 CS1 EAPD
MODE
AD1881A
MODE/SYNCHRONIZER
MIC1
MIC2
LINE_IN
AUX
CD
VIDEO
PHONE_IN
MONO_OUT
LNLVL_OUT_L
LINE_OUT_L
LINE_OUT_R
0dB/
20dB
PGA
16-BIT
⌺⌬ A/D
CONVERTER
PGA
16-BIT
⌺⌬ A/D
CONVERTER
MV
MV
D
A
M
MV
⌺⌺
G G GG G G
A A AA A A
M M MM M M
POP
PHAT
STEREO
⌺⌺⌺⌺
G
A
NC M
POP
PHAT
STEREO
⌺⌺⌺ ⌺⌺
NC G
A
M
SAMPLE
RATE
GENERATORS
16-BIT
⌺⌬ D/A
CONVERTER
16-BIT
⌺⌬ D/A
CONVERTER
RESET
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
LNLVL_OUT_R
PC_BEEP
A G = GAIN
M A = ATTENUATE
M = MUTE
MV = MASTER VOLUME
NC = NO CONNECT
OSCILLATORS
SoundMAX is a registered trademark and PHAT is a trademark of Analog Device, Inc.
REV. 0
XTL_OUT XTL_IN
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., 2000



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AD1885 pdf
AD1881A–SPECIFICATIONS
STANDARD TEST CONDITIONS UNLESS OTHERWISE NOTED
Temperature
Digital Supply (VDD)
Analog Supply (VCC)
Sample Rate (FS)
Input Signal
25
3.3
5.0
48
1008
°C
V
V
kHz
Hz
DAC Test Conditions
Calibrated
–3 dB Attenuation Relative to Full-Scale
Input 0 dB
10 kOutput Load
ADC Test Conditions
Calibrated
0 dB Gain
Input –3.0 dB Relative to Full-Scale
ANALOG INPUT
Parameter
Input Voltage (RMS Values Assume Sine Wave Input)
LINE_IN, AUX, CD, VIDEO, PHONE_IN, PC_BEEP
MIC with +20 dB Gain (M20 = 1)
MIC with 0 dB Gain (M20 = 0)
Input Impedance*
Input Capacitance*
Min Typ
Max
1
2.83
0.1
0.283
1
2.83
20
5
7.5
MASTER VOLUME
Parameter
Step Size (0 dB to –94.5 dB); LINE_OUT_L, LINE_OUT_R
Output Attenuation Range Span*
Step Size (0 dB to –46.5 dB); MONO_OUT
Output Attenuation Range Span*
Mute Attenuation of 0 dB Fundamental*
Min Typ
Max
1.5
–94.5
1.5
–46.5
80
PROGRAMMABLE GAIN AMPLIFIER—ADC
Parameter
Step Size (0 dB to 22.5 dB)
PGA Gain Range Span
Min Typ
1.5
22.5
Max
ANALOG MIXER—INPUT GAIN/AMPLIFIERS/ATTENUATORS
Parameter
Signal-to-Noise Ratio (SNR)
CD to LINE_OUT
Other to LINE_OUT
Step Size (+12 dB to –34.5 dB): (All Steps Tested)
MIC, LINE_IN, AUX, CD, VIDEO, PHONE_IN, DAC
Input Gain/Attenuation Range: MIC, LINE, AUX, CD, VIDEO, PHONE_IN, DAC
Step Size (0 dB to –45 dB): (All Steps Tested) PC_BEEP
Input Gain/Attenuation Range: PC_BEEP
*Guaranteed, not tested.
Specifications subject to change without notice.
Min
Typ
90
90
1.5
–46.5
3.0
–45
Max
Unit
V rms
V p-p
V rms
V p-p
V rms
V p-p
k
pF
Unit
dB
dB
dB
dB
dB
Unit
dB
dB
Unit
dB
dB
dB
dB
dB
dB
–2– REV. 0



Part Number AD1885
Description AC97 SoundMAX Codec
Maker Analog Devices - Analog Devices
Total Page 26 Pages
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