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Analog Devices Semiconductor Electronic Components Datasheet

AD1981A Datasheet

AC 97 SoundMAX Codec

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AD1981A pdf
a
AC ‘97 SoundMAX® Codec
AD1981A
AC ’97 2.2-COMPLIANT CODEC
FEATURES
S/PDIF Output, 20 Bits Data Format, Supporting
48 kHz and 44.1 kHz Sample Rates
Integrated Stereo Headphone Amplifier
Variable Sample Rate Audio
External Audio Power-Down Control
Greater than 90 dB Dynamic Range
16-Bit Stereo Full-Duplex Codec
20-Bit DAC Input
Three Analog Line-Level Stereo Inputs for
LINE-IN, AUX, and CD
Mono Line-Level Phone Input
Mono MIC Input with Built-In Programmable Preamp
High Quality CD Input with Ground Sense
Mono Output for Speakerphone or Internal Speaker
Power Management Support
48-Lead LQFP Package
ENHANCED FEATURES
Built-in Digital Equalizer Function for Optimized
Speaker Sound
Full Duplex Variable Sample Rates from 7040 Hz to 48 kHz
with 1 Hz Resolution
Jack Sense Pins Provide Automatic Output Switching
Software-Programmed VREFOUT Output for Microphone
Bias and External Power Amp
Split Power Supplies: 3.3 V Digital and 5 V Analog
Multiple Codec Configuration Options
MIC_IN
AUX
PHONE_IN
CD_L
CD_GND
CD_R
LINE_IN
HP_OUT_L
LINE_OUT_L
MONO_OUT
LINE_OUT_R
HP_OUT_R
AD1981A
MIC PREAMP
G
CD
DIFF AMP
HP M
A
MA
MA
MA
HP M
A
FUNCTIONAL BLOCK DIAGRAM
VREF
VREFOUT
XTL_OUT XTL_IN ID1 ID0
GA
GA
M
M
GA GA
GA GA GA
MM
MMM
GA
M
M
M
VREF G
XTAL OSCILLATOR LINK PORT/
ID SELECT
A/D SAMPLE RATE
GENERATOR
PLL CLOCK
GENERATOR
GM
16-BIT -A/D
CONVERTER
GM
16-BIT -A/D
CONVERTER
GM
GM
M GA
M GA
16-BIT -A/D
CONVERTER
D/A SAMPLE RATE
GENERATOR
16-BIT -A/D
CONVERTER
20-BIT -D/A
CONVERTER
SPKR
EQ
20-BIT -D/A
CONVERTER
SPKR
EQ
EQ COEFF STORAGE
ANALOG
MUTE
CONTROL
LOGIC
AC ’97 CONTROL REGISTERS
JACK SENSE
EAPD
SPDIF
KEY:
G = GAIN
A = ATTENUATE
M = MUTE
SoundMAX is a registered 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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
JS0 JS1
EAPD
SPDIF
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002


Analog Devices Semiconductor Electronic Components Datasheet

AD1981A Datasheet

AC 97 SoundMAX Codec

No Preview Available !

AD1981A pdf
AD1981A–SPECIFICATIONS
STANDARD TEST CONDITIONS UNLESS OTHERWISE NOTED
Temperature
25°C
DAC Test Conditions
Digital Supply (DVDD)
Analog Supply (VDD)
Sample Rate (FS)
Input Signal
Analog Output Pass Band
3.3 V
5.0 V
48 kHz
1008 Hz
20 Hz to 20 kHz
Calibrated
0 dB Gain/Attenuation Relative to Full Scale
0 dB Input
10 kOutput Load (LINE_OUT)
32 Output Load (HP_OUT)
VIH
VIL
VIH (ID0, ID1)
VIL (ID0, ID1)
2.0 V
0.8 V
4.0 V
1.0 V
ADC Test Conditions
Calibrated
0 dB Gain
Input –3.0 dB Relative to Full Scale
Parameter
ANALOG INPUT
Input Voltage (RMS values assume sine-wave input)
LINE_IN, AUX, CD, PHONE_IN
MIC_IN with 20 dB gain
MIC_IN with 0 dB gain
Input Impedance1
Input Capacitance1
MASTER VOLUME
Step Size (0 dB to –46.5 dB);
LINE_OUT_L, LINE_OUT_R
Output Attenuation Range1
Step Size (0 dB to –46.5 dB); MONO_OUT
Output Attenuation Range1
Step Size (0 dB to –46.5 dB); HP_OUT_R, HP_OUT_L
Output Attenuation Range1
Mute Attenuation of 0 dB Fundamental1
PROGRAMMABLE GAIN AMPLIFIER—ADC
Step Size (0 dB to 22.5 dB)
PGA Gain Range
ANALOG MIXER—INPUT GAIN/AMPLIFIERS/ATTENUATORS
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_IN, LINE_IN, CD, AUX, PHONE_IN, DAC
Input Gain/Attenuation Range:
MIC_IN, LINE_IN, CD, AUX, PHONE_IN, DAC
DIGITAL DECIMATION AND INTERPOLATION FILTERS1
Pass Band
Pass Band Ripple
Transition Band
Stop Band
Stop Band Rejection
Group Delay
Group Delay Variation over Pass Band
Min Typ Max
Unit
1
2.83
0.1
0.283
1
2.83
20
5
7.5
Vrms
Vp-p
Vrms
Vp-p
Vrms
Vp-p
k
pF
1.5
46.5
1.5
46.5
1.5
46.5
80
1.5
22.5
dB
dB
dB
dB
dB
dB
dB
dB
dB
90
90
1.5
46.5
0
0.4 × FS
0.6 × FS
–74
16/FS
0
0.4 × FS
± 0.09
0.6 × FS
dB
dB
dB
dB
Hz
dB
Hz
Hz
dB
s
µs
–2– REV. 0


Part Number AD1981A
Description AC 97 SoundMAX Codec
Maker Analog Devices
Total Page 24 Pages
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