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AD1985 Datasheet

  • AD1985

  • AC ’97 SoundMAX Codec

  • 50頁

  • AD

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AC 鈥?7 SoundMAX
廬
Codec
AD1985
AC 鈥?7 2.3 COMPLIANT FEATURES
6 DAC channels for 5.1 surround
Greater than 90 dB dynamic range
20-bit resolution on all DACs
S/PDIF Output
Integrated stereo headphone amplifiers
Variable rate audio
Double rate audio (f
S
= 96 kHz)
Line-level mono phone input
High quality CD mixer input
Selectable MIC input with preamp
AUX and line in stereo inputs
External amplifier power down (EAPD)
Power management modes
Jack sensing and peripheral enumeration/identification
48-lead LQFP package
ENHANCED FEATURES
Integrated parametric equalizer (EQ)
Stereo microphone with preamplifiers
Integrated PLL for system clocking
Variable sample rate 7 kHz to 96 kHz
7 kHz to 48 kHz in 1 Hz increments
96 kHz for double rate audio
Advanced jack sense with auto topology switching
Software enabled V
REFOUT
for microphones and external
power amp
Software enabled outputs for jack sharing
Auto down-mix and channel spreading
Microphone to mono output
Stereo microphone analog passthrough to outputs
Built-in stereo microphone and Center/LFE pin sharing
Selectable Center/LFE tip/ring swapping to support various
speaker products
FUNCTIONAL BLOCK DIAGRAM
V
REFOUT
OMS
V
REF
Z
G
VOLTAGE
REFERENCE
CODEC CORE
PCM L/R
ADC RATE
16-BIT
危-鈭?/div>
ADC
16-BIT
危-鈭?/div>
ADC
PCM C/LFE
DAC RATE
XTL_OUT XTL_IN SPDIF_OUT
MIC1
MIC2
PHONE_IN
CD_L
CD_GND
CD_R
AUX_L
AUX_R
LINE_IN_L
LINE_IN_R
AD1985
G
2CMIC
MS
G
SPDIF
TX
OMS
PLL
ADC
SLOT
LOGIC
AC '97 INTERFACE V2.3
RECORD
SELECTOR
ID0
CD
DIFF AMP
G
G
M
M
ID1
RESET
LFE_OUT
MZ
A
SPRD
M
GA
20-BIT
危-鈭?/div>
DAC
20-BIT
危-鈭?/div>
DAC
CSWP
DAC
SLOT
LOGIC
SYNC
CENTER_OUT
MZ
A
LOSEL
SPRD
M
GA
M M M
GA
M
GA
M
GA
M
GA
M
GA
M
GA
M
GA
M
M
A
GA
M M M
GA
CSWP
BITCLK
LINE_OUT_L
MZ
A
EQ COEF STORAGE
MONO_OUT
M
A
MIX
PC BEEP
GENERATOR
PCM FRONT
DAC RATE
20-BIT
危-鈭?/div>
DAC
20-BIT
危-鈭?/div>
DAC
20-BIT
危-鈭?/div>
DAC
20-BIT
危-鈭?/div>
DAC
PCM SURR
DAC RATE
BYPASS
SDATA_OUT
LOSEL
EQ
SDATA_IN
LINE_OUT_R
MZ
A
BYPASS
危
HPSEL
危
危
M
M
M
M
M
GA
GA
GA
GA
SURR_OUT_L/
HP_OUT_L
SURR_OUT_R/
HP_OUT_R
HP M
A
EQ
AC '97
CONTROL
REGISTERS
ANALOG MIXING
CONTROL
EAPD JACK SENSE
HP M
A
HPSEL
EAPD JS0 JS1 JS2 JS3
Figure 1.
Rev. A
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.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
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
漏 2004 Analog Devices, Inc. All rights reserved.
03610-A-001
G = GAIN
A = ATTENUATION
M = MUTE
Z = HIGH Z
M

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