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Analog Devices Semiconductor Electronic Components Datasheet

AD1985 Datasheet

AC 97 SoundMAX Codec

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AD1985 pdf
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
VREFOUT
VREF
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 MM M
Σ
Σ
M
G = GAIN
A = ATTENUATION
M = MUTE
Z = HIGH Z
Σ
M
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
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 © 2004 Analog Devices, Inc. All rights reserved.



Analog Devices Semiconductor Electronic Components Datasheet

AD1985 Datasheet

AC 97 SoundMAX Codec

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AD1985 pdf
AD1985
TABLE OF CONTENTS
Detailed Functional Block Diagram .............................................. 3
Specifications..................................................................................... 4
Analog Input ................................................................................. 4
Master Volume .............................................................................. 4
Programmable Gain Amplifier—ADC...................................... 4
Analog Mixer—Input Gain/Amplifiers/Attenuators............... 5
Digital Decimation and Interpolation Filters ........................... 5
Analog-to-Digital Converters..................................................... 5
Digital-to-Analog Converters..................................................... 5
Analog Output .............................................................................. 6
Static Digital Specifications......................................................... 6
Power Supply................................................................................. 6
Power-Down States ...................................................................... 7
Clock Specifications ..................................................................... 7
Timing Parameters ....................................................................... 8
Absolute Maximum Ratings.......................................................... 10
Environmental Conditions........................................................ 10
ESD Caution................................................................................ 10
Pin Configuration and Functional Descriptions........................ 11
Pin Descriptions ......................................................................... 11
Indexed Control Registers......................................................... 13
Outline Dimensions ....................................................................... 47
Ordering Guide........................................................................... 47
REVISION HISTORY
3/04—Data Sheet changed from Rev. 0 to Rev. A
Updated Format.................................................................Universal
Changes to Figure 1......................................................................... 1
Changes to Figure 2......................................................................... 3
Changes to Table 4........................................................................... 4
Changes to Tables 5, 7, and 8.......................................................... 5
Changes to Table 12 ........................................................................ 7
Changes to Pin Configuration..................................................... 11
Changes to Circuit Layout Note .................................................. 11
Changes to Indexed Control Registers ....................................... 13
Changes to Master Volume Register (Index 0x02).................... 15
Changes to Headphone Volume Register (Index 0x04) ........... 16
Changes to Mono Volume Register (Index 0x06) ..................... 17
Changes to PC Beep Register (Index 0x0A) .............................. 18
Changes to Microphone Volume Register (Index 0x0E).......... 19
Changes to AUX In Volume Register (Index 0x16) .................. 21
Changes to Record Select Control Register (Index 0x1A)....... 22
Changes to Record Gain Register (Index 0x1C) ....................... 23
Changes to Extended Audio ID Register (Index 0x28) ............ 27
Changes to Center/LFE Volume Control
Register (Index 0x36).................................................................... 30
Changes to Surround Volume Control Register
(Index 0x38) ................................................................................... 31
Changes to Jack Sense/Audio Interrupt/Status Register
(Index 0x72) ................................................................................... 36
Changes to Miscellaneous Control Bits (Index 0x76) .............. 39
Changes to Advanced Jack Sense Register (Index 0x78).......... 41
Updated Outline Dimensions...................................................... 47
Updated Ordering Guide.............................................................. 47
3/03—Revision 0: Initial Version
Rev. A | Page 2 of 48



Analog Devices Semiconductor Electronic Components Datasheet

AD1985 Datasheet

AC 97 SoundMAX Codec

No Preview Available !

AD1985 pdf
DETAILED FUNCTIONAL BLOCK DIAGRAM
AD1985
Figure 2. Detailed Functional Block Diagram
Rev. A | Page 3 of 48




Part Number AD1985
Description AC 97 SoundMAX Codec
Maker Analog Devices
Total Page 30 Pages
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