AD1985 Datasheet, PDF (1/48 Pages) Analog Devices – AC ’97 SoundMAX Codec

AC ’97 SoundMAX^® Codec
AD1985
AC ’97 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 (fS = 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 VREFOUT 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
MIC1
MIC2
PHONE_IN
CD_L
CD_GND
CD_R
AUX_L
AUX_R
LINE_IN_L
LINE_IN_R
LFE_OUT
G
G
CD
DIFF AMP
MZ A
CENTER_OUT
MZ A
LINE_OUT_L MZ A
MONO_OUT
MA
LINE_OUT_R MZ A
SURR_OUT_L/
HP_OUT_L
HP M
A
SURR_OUT_R/
HP_OUT_R
HP M A
FUNCTIONAL BLOCK DIAGRAM
AD1985
V_REFOUT
V_REF
XTL_OUT XTL_IN SPDIF_OUT
ZG
VOLTAGE
REFERENCE
CODEC CORE
PCM L/R
ADC RATE
G
M
16-BIT
Σ-∆ ADC
G
M
16-BIT
Σ-∆ ADC
PLL
ADC
SLOT
LOGIC
SPDIF
TX
ID0
ID1
PCM C/LFE
DAC RATE
M
GA
20-BIT
Σ-∆ DAC
GA GA GA GA GA
M M M ^GA M ^GA M ^GA M ^GA M M M
M
M
M
M
Σ
Σ
Σ
M
M
G = GAIN
A = ATTENUATION
M = MUTE
Z = HIGH Z
M
GA
20-BIT
Σ-∆ DAC
MA
M GA
M GA
M GA
M GA
PC BEEP
GENERATOR
PCM FRONT
DAC RATE
20-BIT
Σ-∆ DAC
20-BIT
Σ-∆ DAC
20-BIT
Σ-∆ DAC
20-BIT
Σ-∆ DAC
PCM SURR
DAC RATE
DAC
SLOT
LOGIC
EQ
RESET
SYNC
BITCLK
SDATA_OUT
SDATA_IN
EQ
AC '97
CONTROL
REGISTERS
ANALOG MIXING
CONTROL
EAPD _{JACK SENSE}
EAPD JS0 JS1 JS2 JS3
Figure 1.
Rev. A
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