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AD1888 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD1888
Beschreibung AC 97 SoundMAX Codec
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 30 Seiten
AD1888 Datasheet, Funktion
a
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 Packages
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
MA
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
REV. 0
HP M A
HP M A
AD1888
G
M
16-BIT -
ADC
G
M
16-BIT -
ADC
ADC
SLOT
LOGIC
PLL
GA GA
GA
GA
MM
GA
GA
M
M GA
M
GA
M
GA
M
MM
MMMMMM
G = GAIN
A = ATTENUATION
M = MUTE
Z = HIGH-Z
M GA
M GA
20-BIT -
DAC
20-BIT -
DAC
M GA
M GA
20-BIT -
DAC
20-BIT -
DAC
M GA
M GA
20-BIT -
DAC
20-BIT -
DAC
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
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. 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 © 2003 Analog Devices, Inc. All rights reserved.






AD1888 Datasheet, Funktion
AD1888
ABSOLUTE MAXIMUM RATINGS*
Parameter
Min Max
Unit
Power Supplies
Digital (DVDD)
–0.3
Analog (AVDD)
–0.3
Input Current (Except Supply Pins)
Analog Input Voltage (Signal Pins) –0.3
Digital Input Voltage (Signal Pins) –0.3
Ambient Temperature (Operating) 0
Storage Temperature
–65
+3.6
+6.0
± 10.0
AVDD + 0.3
DVDD + 0.3
+70
+150
V
V
mA
V
V
°C
°C
*Stresses greater than those listed under Absolute Maximum Ratings may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in
the operational section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
ENVIRONMENTAL CONDITIONS*
Ambient Temperature Rating
TCASE = Case Temperature in °C
PD = Power Dissipation in W
JA = Thermal Resistance (Junction-to-Ambient)
JC = Thermal Resistance (Junction-to-Case)
Package
LQFP
LFCSP
θJA
50.1°C/W
50°C/W
θJC
17.8°C/W
25.88°C/W
*All measurements per EIA/JESD51 with 2S2P
test board per EIA/JESD51-7.
ORDERING GUIDE
Model
AD1888JST
AD1888JST-REEL
AD1888JSTZ*
AD1888JSTZ-REEL*
AD1888JCP
AD1888JCP-REEL
*Z = Lead Free
Temperature Range
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
Package Description
48-Lead LQFP, Tray Version
48-Lead LQFP, Reel Version
48-Lead LQFP, Tray Version
48-Lead LQFP, Reel Version
48-Lead LFCSP, Tray Version
48-Lead LFCSP, Reel Version
Package Option
ST-48
ST-48
ST-48
ST-48
CP-48
CP-48
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
AD1888 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended
to avoid performance degradation or loss of functionality.
–6– REV. 0

6 Page









AD1888 pdf, datenblatt
AD1888
Phone_in Volume Register (Index 0Ch)
Reg
No. Name
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
0Ch Phone_in Volume PHM X X X X X X X X X X PHV4 PHV3 PHV2 PHV1 PHV0 8008h
All registers not shown and bits containing an X are assumed to be reserved. Refer to Table III for examples.
PHV[4:0]
PHM
Phone Volume. Allows setting the Phone Volume attenuator in 32 volume levels with 31 steps of 1.5 dB each. The
LSB represents 1.5 dB, and the gain range is +12 dB to –34.5 dB. The default value is 0 dB, with the mute bit enabled.
Phone Mute. When this bit is set to 1, the Phone channel is muted.
MIC Volume Register (Index 0Eh)
Reg
No. Name
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
0Eh MIC Volume MCM X X X X X X X X M20 X MCV4 MCV3 MCV2 MCV1 MCV0 8008h
All registers not shown and bits containing an X are assumed to be reserved. Refer to Table III for examples.
MCV[4:0]
M20
MCM
MIC Volume Gain. Allows setting the MIC Volume attenuator in 32 volume levels. The LSB represents 1.5 dB,
and the gain range is +12 dB to –34.5 dB. The default value is 0 dB, with mute enabled.
MIC Gain Boost. This bit allows setting additional MIC gain to increase the microphone sensitivity. The nominal
gain boost by default is 20 dB; however, Bits D0 and D1 (MBG[1:0]) on the miscellaneous control bits register
(76h) allow changing the gain boost to 10 dB or 30 dB, if necessary.
0 = Disabled; Gain = 0 dB
1 = Enabled; Default Gain = 20 dB (see Register 76h, Bits D0, D1)
MIC Mute. When this bit is set to 1, the channel is muted.
Table III. Volume Settings for Phone and MIC
Control Bits D[4:0]
Phone (0Ch) and MIC (0Eh)
D15 WRITE
READBACK
0 0 0000
0 0 1000
0 1 1111
1 x xxxx
0 0000
0 1000
1 1111
x xxxx
x in the above table is a wild card, and has no effect on the value.
Function
12 dB Gain
0 dB Gain
–34.5 dB Gain
ϱ dB Gain, Muted
–12–
REV. 0

12 Page





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