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Analog Devices Semiconductor Electronic Components Datasheet



AD1981BL

AC 97 SoundMAX Codec



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AD1981BL pdf
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AC ’97 SoundMAX® Codec
AD1981BL
AC ’97 2.3 COMPATIBLE FEATURES
ENHANCED FEATURES
S/PDIF output, 20-bit data format, supporting
Stereo MIC preamplifier support
48 kHz and 44.1 kHz sample rates
Built-in digital equalizer function for optimized
Integrated stereo headphone amplifier
speaker sound
Variable sample rate audio
Full-duplex variable sample rates from 7040 Hz to
External audio power-down control
48 kHz with 1 Hz resolution
>90 dB dynamic range
Jack sense pins for automatic output switching
Stereo full-duplex codec
Software-programmed VREFOUT output for biasing
20-bit PCM DAC
microphone and external power amplifier
3 analog line-level stereo inputs for line-in, AUX, and CD
Low power 3.3 V operation for analog and digital supplies
Mono line-level phone input
Multiple codec configuration options
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
FUNCTIONAL BLOCK DIAGRAM
VREFOUT
VREF
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
MA
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
GA GA
GA GA
MM
MM
M
GA GA
GA GA
MM
MM
M GA
20-BIT
Σ-DAC
G = GAIN
A = ATTENUATION
M = MUTE
Z = HIGH Z
PCM FRONT
DAC RATE
M
EQ
SDATA_IN
AC '97
CONTROL
REGISTERS
ANALOG MIXING
CONTROL LOGIC
EAPD
Figure 1.
JS0 JS1 EAPD
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 © 2005 Analog Devices, Inc. All rights reserved.



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AD1981BL
TABLE OF CONTENTS
Specifications..................................................................................... 3
Test Conditions............................................................................. 3
General Specifications ................................................................. 3
Power-Down States ...................................................................... 5
Timing Parameters ....................................................................... 5
Absolute Maximum Ratings............................................................ 9
Environmental Conditions.......................................................... 9
Pin Configuration and Function Descriptions........................... 10
Indexed Control Registers ............................................................. 12
Control Register Details ................................................................ 13
Reset Register .............................................................................. 13
Master Volume Register............................................................. 13
Headphone Volume Register .................................................... 14
Mono Volume Register .............................................................. 15
Phone Volume Register.............................................................. 15
MIC Volume Register................................................................. 16
Line-In Volume Register............................................................ 16
CD Volume Register................................................................... 17
AUX Volume Register ................................................................ 17
REVISION HISTORY
1/05—Rev. 0 to Rev. A
Updated Format..................................................................Universal
Changes to Ordering Guide .......................................................... 32
1/04—Revision 0: Initial Version
PCM-Out Volume Register....................................................... 18
Record Select Control Register................................................. 19
Record Gain Register ................................................................. 19
General-Purpose Register ......................................................... 20
Power-Down Control/Status Register ..................................... 21
Extended Audio ID Register ..................................................... 22
Extended Audio Status and Control Register......................... 22
PCM Front DAC Rate Register................................................. 23
PCM ADC Rate Register ........................................................... 23
SPDIF Control Register ............................................................. 24
EQ Control Register................................................................... 24
EQ Data Register ........................................................................ 26
Mixer ADC, Input Gain Register ............................................. 26
Jack Sense/Audio Interrupt/Status Register............................ 27
Serial Configuration Register ................................................... 29
Miscellaneous Control Bit Register ......................................... 29
Vendor ID Registers................................................................... 31
Outline Dimensions ....................................................................... 32
Ordering Guide .......................................................................... 32
Rev. A | Page 2 of 32



Part Number AD1981BL
Description AC 97 SoundMAX Codec
Maker Analog Devices - Analog Devices
Total Page 30 Pages
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