ADSP-1981BL Datasheet, PDF (1/32 Pages) Analog Devices – AC 97 SoundMAX Codec

AC ’97 SoundMAX^® Codec
AD1981BL
AC ’97 2.3 COMPATIBLE FEATURES
ENHANCED FEATURES
S/PDIF output, 20-bit data format, supporting
48 kHz and 44.1 kHz sample rates
Integrated stereo headphone amplifier
Variable sample rate audio
External audio power-down control
>90 dB dynamic range
Stereo full-duplex codec
20-bit PCM DAC
3 analog line-level stereo inputs for line-in, AUX, and CD
Mono line-level phone input
Dual MIC input with built-in programmable preamplifier
High quality CD input with ground sense
Mono output for speakerphone or internal speaker
power management support
48-lead LQFP package, Pb-free available
Stereo MIC preamplifier support
Built-in digital equalizer function for optimized
speaker sound
Full-duplex variable sample rates from 7040 Hz to
48 kHz with 1 Hz resolution
Jack sense pins for automatic output switching
Software-programmed VREFOUT output for biasing
microphone and external power amplifier
Low power 3.3 V operation for analog and digital supplies
Multiple codec configuration options
FUNCTIONAL BLOCK DIAGRAM
V_REFOUT
V_REF
XTL_OUT XTL_IN SPDIF
MIC1
MIC2
PHONE_IN
CD_L
CD_GND
CD_R
AUX_L
AUX_R
LINE_IN_L
LINE_IN_R
AD1981BL
MIC PREAMP
G
G
CD
DIFF AMP
MONO_OUT
M
A
G
VOLTAGE
REFERENCE
CODEC CORE
GM
GM
PCM L/R
ADC RATE
16-BIT

Σ-∆ ADC
16-BIT

Σ-∆ ADC
SPDIF
TX
PLL
ID0
ID1
GM
GM
16-BIT

Σ-∆ ADC
16-BIT

Σ-∆ ADC
ADC
AND
DAC
SLOT
LOGIC
RESET
SYNC
BIT_CLK
M GA
20-BIT
Σ
-∆ DAC
EQ
SDATA_OUT
HP_OUT_L
HP M
A
LINE_OUT_L
MZ
A
LINE_OUT_R
MZ
A
HP_OUT_R
HP M
A
M GA
20-BIT
Σ-∆ DAC
GA
GA
EQ
GA
GA
M
M
GA
GA
G = GAIN
A = ATTENUATION
M = MUTE
PCM FRONT
DAC RATE
M
M
GA
GA
Z = HIGH Z
M
M
M
M
M
M
SDATA_IN
AC '97
CONTROL
REGISTERS
ANALOG MIXING
CONTROL LOGIC
EAPD
Figure 1.
JS0
JS1 EAPD
Rev. A
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