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Analog Devices Semiconductor Electronic Components Datasheet



AD1887

AC97 SoundMAX Codec


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AD1887 pdf
a
AC’97 2.1 FEATURES
Variable Sample Rate Audio
AC’97 FEATURES
AC’97 2.2 Compliant
Greater than 90 dB Dynamic Range
Integrated Stereo Headphone Amplifier
Multibit -Converter Architecture for Improved S/N
Ratio Greater than 90 dB
16-Bit Stereo Full-Duplex Codec
Two Analog Line-Level Stereo Inputs for:
LINE-IN and CD
Mono MIC Input with Built-In Programmable Preamp
High-Quality CD Input with Ground Sense
Power Management Support
48-Terminal TQFP Package
AC’97 SoundMAX® Codec
AD1887
ENHANCED FEATURES
Full Duplex Variable Sample Rates from 7040 Hz to
48 kHz with 1 Hz Resolution
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 Headphone Volume Control
Digital Audio Mixer Mode
FUNCTIONAL BLOCK DIAGRAM
ID0 ID1
MIC
LINE_IN
CD
AD1887
MIC
PREAMP
HP_OUT_L
HP M GA
HP_OUT_R
HP M GA
CHIP SELECT
VREF
VREFOUT
GA GA GA GA GA
MMMMM
M
G = GAIN
A = ATTENUATE
M = MUTE
M
PGA
16-BIT
-A/D
CONVERTER
PGA
16-BIT
-A/D
CONVERTER
SAMPLE
RATE
GENERATORS
M GA
16-BIT
-A/D
CONVERTER
M GA
16-BIT
-A/D
CONVERTER
OSCILLATOR
XTL_OUT XTL_IN
AC
LINK
RESET
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
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.
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., 2001



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AD1887 pdf
AD1887–SPECIFICATIONS
STANDARD TEST CONDITIONS UNLESS OTHERWISE NOTED
Temperature
Digital Supply (VDD)
Analog Supply (VCC)
Sample Rate (fS)
Input Signal
Analog Output Pass Band
VIH
VIL
VIH (CS0, CS1)
VIL
25°C
3.3 V
5.0 V
48 kHz
1008 Hz
20 Hz to 20 kHz
2.0 V
0.8 V
4.0 V
1.0 V
DAC Test Conditions
Calibrated
–3 dB Attenuation Relative to Full Scale
Input 0 dB
32 Output Load (HP_OUT)
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, CD
MIC with 20 dB Gain
MIC with 0 dB Gain
Input Impedance*
Input Capacitance*
Min Typ Max
1
2.83
0.1
0.283
1
2.83
20
5
7.5
Unit
V rms
V p-p
V rms
V p-p
V rms
V p-p
k
pF
HEADPHONE OUT VOLUME
Parameter
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
Unit
1.5
–94.5
80
dB
dB
dB
PROGRAMMABLE GAIN AMPLIFIER—ADC
Parameter
Step Size (0 dB to 22.5 dB)
PGA Gain Range Span
Min
Typ
Max
Unit
1.5 dB
22.5 dB
ANALOG MIXER—INPUT GAIN/AMPLIFIERS/ATTENUATORS
Parameter
Signal-to-Noise Ratio (SNR)
CD to HP_OUT
Other to HP_OUT
Step Size (+12 dB to –34.5 dB): (All Steps Tested)
MIC, LINE_IN, CD, DAC
Input Gain/Attenuation Range:
MIC, LINE_IN, CD, DAC
Min
Typ
Max
Unit
90
90
1.5
–46.5
dB
dB
dB
dB
DIGITAL DECIMATION AND INTERPOLATION FILTERS*
Parameter
Pass Band
Pass-Band Ripple
Transition Band
Stop Band
Stop-Band Rejection
Group Delay
Group Delay Variation over Pass Band
*Guaranteed but not tested.
–2–
Min
Typ
Max
Unit
0
0.4 × fS
0.6 × fS
–74
0.4 × fS
± 0.09
0.6 × fS
12/fS
0.0
Hz
dB
Hz
Hz
dB
sec
µs
REV. 0



Part Number AD1887
Description AC97 SoundMAX Codec
Maker Analog Devices - Analog Devices
Total Page 16 Pages
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