A3983_08 Datasheet, PDF (1/32 Pages) Allegro MicroSystems – DMOS Microstepping Driver with Translator

AC ’97 SoundMAX® Codec
AD1888
FEATURES
AC ’97 2.3 compatible features
6 DAC channels for 5.1 surround
90 dB dynamic range
20-bit PCM DACs
S/PDIF output
Integrated stereo headphone amplifiers
Phone, aux, and line-in
High quality CD input
Selectable MIC input
Mono output
External amplifier power-down control
Double rate audio (fS = 96 kHz)
Power-management modes
48-lead LQFP and 48-lead LFCSP
ENHANCED FEATURES
Selectable front and rear MIC inputs with preamp
Integrated PLL for system clocking
Crystal-free operation
Variable sample rate 7 kHz to 96 kHz
Jack sense (auto topology switching)
Software-controlled VREF_OUT for MIC bias
Software enabled outputs for jack sharing
Auto down-mix and channel spreading modes
FUNCTIONAL BLOCK DIAGRAM
MIC1
MIC2
PHONE_IN
CD_L
CD_R
AUX_L
AUX_R
LINE_IN_L
LINE_IN_R
G
DIFF
AMP
MONO_OUT
M
A
LINE_OUT_L
LINE_OUT_R
MZ A
MZ A
CENTER_OUT
LFE_OUT
MZ A
MZ A
SURR_L/
HP_OUT_L
SURR_R/
HP_OUT_R
HP M A
HP M A
AD1888
G
M
16-BIT Σ-Δ
ADC
G
M
16-BIT Σ-Δ
ADC
PLL
ADC
SLOT
LOGIC
GA
GA
GA
GA
M
M
GA
GA
M
GA
M
M
GA
M
GA
M
M
M
MMMMMM
G = GAIN
A = ATTENUATION
M = MUTE
Z = HIGH-Z
M GA
20-BIT Σ-Δ
DAC
M GA
20-BIT Σ-Δ
DAC
M GA
M GA
20-BIT Σ-Δ
DAC
20-BIT Σ-Δ
DAC
M GA
M GA
20-BIT Σ-Δ
DAC
20-BIT Σ-Δ
DAC
Figure 1.
AC '97
CONTROL
REGISTERS
DAC
SLOT
LOGIC
SPDIF
TX
EAPD
JACK
SENSE
LOGIC
VOLTAGE
REFERENCE
XTAL_IN
XTAL_OUT
ID0
ID1
RESET
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
SPDIF_OUT
EAPD
JS0
JS1
VREF
VREFOUT
Rev. A
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