AC 97 SoundMAX Codec
Description
a
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 Packages
AC ’97 SoundMAX Codec AD1888
®
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
AD1888
G
XTAL_IN
XTAL_OUT PLL DIFF AMP
G M 16-BIT ⌺-⌬ ADC
G
M
16-BIT ⌺-⌬ ADC
ADC SLOT LOGIC
ID0 ID1
AC '97 INTERFACE
RESET SYNC
GA M GA M GA M GA M
GA M GA GA M M
AC '97 CONTROL REGISTERS
GA M
GA
MONO_OUT
M
A
M
BIT_CLK
SDATA_OUT DAC SLOT LOGIC
M GA 20-BIT ⌺-⌬ DAC 20-BIT ⌺-⌬ DAC
SDATA_IN
LINE_OUT_L
MZ
A
LINE_OUT_R
MZ
A
M GA
SPDIF TX
SPDIF_OUT
M
M
M
M
M
M 20-BIT ⌺-⌬ DAC 20-BIT ⌺-⌬ DAC
EAPD
M GA
EAPD
CENTER_OUT
MZ
A
LFE_OUT
MZ
A
M G = GAIN A = ATTENUATION M = MUTE Z = HIGH-Z M GA GA
JACK SENSE LOGIC VOLTAGE REFERENCE
JS0 JS1 VREF VREFOUT
SURR_L/ HP_OUT_L SURR_R/ HP_OUT_R
HP
M
A
20-BIT ⌺-⌬ DAC 20-BIT ⌺-⌬ DAC
HP
M
A
M GA
REV.
0
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