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Analog Devices Semiconductor Electronic Components Datasheet



AD1881

AC97 SoundMAX Codec



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AD1881 pdf
a
AC’97 SoundMAX® Codec
AD1885
AC’97 2.1 FEATURES
ENHANCED FEATURES
Variable Sample Rate Audio
Multiple Codec Configuration Options
External Audio Power-Down Control
Full Duplex Variable Sample Rates from 7040 Hz to
48 kHz with 1 Hz Resolution
Jack Sense Pins Provide Automatic Output Switching
AC’97 FEATURES
AC’97 2.1-Compliant
Greater than 90 dB Dynamic Range
Stereo Headphone Amplifier
Multibit ⌺⌬ Converter Architecture for Improved S/N
Ratio Greater than 90 dB
16-Bit Stereo Full-Duplex Codec
Four Analog Line-Level Stereo Inputs for:
Software-Enabled VREFOUT Output for Microphones and
External Power Amp
Split Power Supplies (3.3 V Digital/5 V Analog)
Mobile Low-Power Mixer Mode
Extended 6-Bit Master Volume Control
Extended 6-Bit Headphone Volume Control
Digital Audio Mixer Mode
PHAT™ Stereo 3D Stereo Enhancement
LINE-IN, CD, VIDEO, and AUX
Two Analog Line-Level Mono Inputs for Speakerphone
and PC BEEP
Mono MIC Input w/Built-In 20 dB Preamp, Switchable
from Two External Sources
High Quality CD Input with Ground Sense
Stereo Line-Level Outputs
Mono Output for Speakerphone or Internal Speaker
Power Management Support
48-Terminal LQFP Package
FUNCTIONAL BLOCK DIAGRAM
ID0 ID1
JS0/EAPD JS1
MIC1
MIC2
LINE
AUX
CD
VIDEO
PHONE_IN
MONO_OUT
HP_OUT_L
LINE_OUT_L
AD1885
0dB/
20dB
MMV
HV
MV
CHIP SELECT
JACK SENSES
AND EAPD CTRL
VREF
PGA
16-BIT
⌺⌬ A/D
CONVERTER
PGA
16-BIT
⌺⌬ A/D
CONVERTER
POP
G
A
M
PHAT
STEREO
G GG G G
A AA A A
M MM M M
⌺⌺ ⌺ ⌺
SAMPLE
RATE
GENERATORS
NC G
A
M
16-BIT
⌺⌬ D/A
CONVERTER
VREFOUT
RESET
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
LINE_OUT_R
HP_OUT_R
PC_BEEP
MV
HV
PHAT
STEREO
POP
A
M
⌺⌺⌺ ⌺⌺
G = GAIN
A = ATTENUATE
M = MUTE
MV = MASTER VOLUME
HV = HEADPHONE VOLUME
G
A
NC M
16-BIT
⌺⌬ D/A
CONVERTER
OSCILLATOR
SoundPort is a registered trademark and PHAT is a trademark of Analog Devices, Inc.
XTL_OUT XTL_IN
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., 2000



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AD1881 pdf
AD1885–SPECIFICATIONS
STANDARD TEST CONDITIONS UNLESS OTHERWISE NOTED
Temperature
Digital Supply (DVDD)
Analog Supply (AVDD)
Sample Rate (FS)
Input Signal
Analog Output Passband
25 °C
3.3 V
5.0 V
48 kHz
1008
Hz
20 Hz to 20 kHz
DAC Test Conditions
Calibrated
–3 dB Attenuation Relative to Full Scale
Input 0 dB
10 kOutput Load (LINE_OUT)
32 Output Load (HP_OUT)
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*
ADC Test Conditions
Calibrated
0 dB Gain
Input –3.0 dB Relative to Full Scale
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*
Step Size (+6 dB to –88.5 dB); HP_OUT_R, HP_OUT_L
Output Attenuation Range Span*
Mute Attenuation of 0 dB Fundamental*
Min Typ Max
1.5
–94.5
1.5
–46.5
1.5
–94.5
80
PROGRAMMABLE GAIN AMPLIFIER—ADC
Parameter
Step Size (0 dB to 22.5 dB)
PGA Gain Range Span
Min Typ Max
1.5
22.5
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.
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
dB
dB
Unit
dB
dB
Unit
dB
dB
dB
dB
dB
dB
–2– REV. 0



Part Number AD1881
Description AC97 SoundMAX Codec
Maker Analog Devices - Analog Devices
Total Page 27 Pages
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