IC AUDIO CODEC AC'97 48-LQFP

AD1885JST

Manufacturer Part NumberAD1885JST
DescriptionIC AUDIO CODEC AC'97 48-LQFP
ManufacturerAnalog Devices Inc
SeriesSoundMAX®
TypeAudio Codec '97
AD1885JST datasheet
 


Specifications of AD1885JST

Rohs StatusRoHS non-compliantData InterfaceSerial
Resolution (bits)16 bNumber Of Adcs / Dacs2 / 2
Sigma DeltaYesDynamic Range, Adcs / Dacs (db) Typ87 / 90
Voltage - Supply, Analog4.75 V ~ 5.25 VVoltage - Supply, Digital3.15 V ~ 3.45 V
Operating Temperature0°C ~ 70°CMounting TypeSurface Mount
Package / Case48-LQFP  
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a
AD1885
MIC1
0dB/
20dB
MIC2
LINE
AUX
CD
VIDEO
PHONE_IN
MONO_OUT
MMV
HV
HP_OUT_L
MV
LINE_OUT_L
LINE_OUT_R
MV
HV
HP_OUT_R
PC_BEEP
SoundPort is a registered trademark and PHAT is a trademark of Analog Devices, Inc.
FUNCTIONAL BLOCK DIAGRAM
ID0
ID1
JS0/EAPD
JS1
JACK SENSES
CHIP SELECT
AND EAPD CTRL
G
G
G
G
G
G
A
A
A
A
A
A
M
M
M
M
M
M
POP
PHAT
STEREO
PHAT
STEREO
POP
G = GAIN
A
A = ATTENUATE
M
M = MUTE
MV = MASTER VOLUME
HV = HEADPHONE VOLUME
AC’97 SoundMAX
®
AD1885
V
V
REF
REFOUT
16-BIT
A/D
PGA
CONVERTER
16-BIT
RESET
A/D
PGA
CONVERTER
SYNC
SAMPLE
RATE
BIT_CLK
GENERATORS
SDATA_OUT
NC
G
16-BIT
A
D/A
M
CONVERTER
SDATA_IN
G
16-BIT
D/A
A
CONVERTER
NC
M
OSCILLATOR
XTL_OUT XTL_IN
Codec

AD1885JST Summary of contents

  • Page 1

    AD1885 MIC1 0dB/ 20dB MIC2 LINE AUX CD VIDEO PHONE_IN MONO_OUT MMV HV HP_OUT_L MV LINE_OUT_L LINE_OUT_R MV HV HP_OUT_R PC_BEEP SoundPort is a registered trademark and PHAT is a trademark of Analog Devices, Inc. FUNCTIONAL BLOCK DIAGRAM ID0 ...

  • Page 2

    AD1885–SPECIFICATIONS STANDARD TEST CONDITIONS UNLESS OTHERWISE NOTED Temperature Digital Supply ( Analog Supply ( Sample Rate ( Input Signal Analog Output Passband ANALOG INPUT Parameter Input Voltage (RMS Values Assume Sine Wave Input) LINE_IN, ...

  • Page 3

    DIGITAL DECIMATION AND INTERPOLATION FILTERS Parameter Passband Passband Ripple Transition Band Stopband Stopband Rejection Group Delay Group Delay Variation Over Passband ANALOG-TO-DIGITAL CONVERTERS Parameter Resolution Total Harmonic Distortion (THD Dynamic Range (–60 dB Input THD+N Referenced to Full Scale, A-Weighted) ...

  • Page 4

    AD1885–SPECIFICATIONS STATIC DIGITAL SPECIFICATIONS Parameter High-Level Input Voltage (V ): Digital Inputs IH Low-Level Input Voltage ( High-Level Output Voltage ( Low-Level Output Voltage ( Input Leakage ...

  • Page 5

    TIMING PARAMETERS (GUARANTEED OVER OPERATING TEMPERATURE RANGE) Parameter RESET Active Low Pulsewidth RESET Inactive to BIT_CLK Startup Delay SYNC Active High Pulsewidth SYNC Low Pulsewidth SYNC Inactive to BIT_CLK Startup Delay BIT_CLK Frequency BIT_CLK Period BIT_CLK Output Jitter BIT_CLK High ...

  • Page 6

    AD1885 t RST_LOW t RST2CLK RESET BIT_CLK t t SYNC_HIGH RST2CLK SYNC BIT_CLK t CLK_LOW BIT_CLK t CLK_HIGH t CLK_PERIOD t SYNC_LOW SYNC t SYNC_HIGH t SYNC_PERIOD t SETUP BIT_CLK SYNC SDATA_OUT t HOLD BIT_CLK t t RISECLK FALLCLK SYNC ...

  • Page 7

    ... Although the AD1885 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. Max Unit Model +3.6 V AD1885JST +6.0 V ± Thin Quad Flatpack 0 ...

  • Page 8

    AD1885–SPECIFICATIONS Digital I/O Pin Name LQFP XTL_IN 2 XTL_OUT 3 SDATA_OUT 5 BIT_ CLK 6 SDATA_IN 8 SYNC 10 RESET 11 CHIP SELECTS Pin Name LQFP ID0 45 ID1 46 JACK SENSES/EAPD/GENERAL-PURPOSE DIGITAL OUTPUTS These signals can sense the presence ...

  • Page 9

    Filter/Reference These signals are connected to resistors, capacitors, or specific voltages. Pin Name LQFP V 27 REF V 28 REFOUT AFILT1 29 AFLIT2 30 FILT_R 31 FILT_L 32 RX3D 33 CX3D 34 Power and Ground Signals Pin Name LQFP DV ...

  • Page 10

    AD1885 PRODUCT OVERVIEW The AD1885 Codec meets the Audio Codec ’97 2.1 Extensions, adding support for multiple Codecs and variable sample rates. In addition, the AD1885 SoundPort Codec is designed to meet all requirements of the Audio Codec ’97, Component ...

  • Page 11

    Reg Num Name D15 D14 00h Reset X SE4 02h Master Volume MM X 04h Headphones Volume HPM X 06h Master Volume Mono MMM X 08h Reserved X X 0Ah PC Beep Volume PCM X 0Ch Phone In Volume PHM ...

  • Page 12

    AD1885 Reset (Index 00h ...

  • Page 13

    Headphones Volume Registers (Index 04h ...

  • Page 14

    AD1885 Phone Volume (Index 0Ch ...

  • Page 15

    Video Volume (Index 14h ...

  • Page 16

    AD1885 Record Select Control Register (Index 1Ah ...

  • Page 17

    General-Purpose Register (Index 20h ...

  • Page 18

    AD1885 Subsection Ready Register (Index 26h ...

  • Page 19

    Extended Audio Status and Control Register (Index 2Ah ...

  • Page 20

    AD1885 JS0_OE Enables JS0 pin as a general-purpose output. JS1_OE Enables JS1 pin as a general-purpose output. JS0PUDIS Setting the JS0PUDIS bit disables the JS0 pin internal pull-up. JS1PUDIS Setting the JS1PUDIS bit disables the JS1 pin internal pull-up. JS0_OUT ...

  • Page 21

    Sample Rate 0 (Index 78h ...

  • Page 22

    AD1885 APPLICATIONS CIRCUITS The AD1885 has been designed to require a minimum amount of external circuitry. The recommended applications circuits are shown in Figures 9–18. Reference designs for the AD1885 are available and may be obtained by contacting your local ...

  • Page 23

    JACK SENSE OPERATION The AD1885 features two Jack Sense pins (JS0 and JS1) that can be used to automatically mute the LINE_OUT and/or MONO_OUT audio outputs. When the Jack Sense pins are connected to the output jacks, the AD1885 can ...

  • Page 24

    AD1885 NOTE: LOCATE R1 AND C1 CLOSE TO CODEC. TO CODEC JS1 (PIN 48) FROM CODEC HP_OUT_R (PIN 41) FROM CODEC HP_OUT_L (PIN 39) LINE_ OUT Jack Although not shown LINE_OUT jack is used and the jack sense ...

  • Page 25

    MICROPHONE CONNECTIONS The AD1885 contains an internal microphone preamp with 20 dB gain; in most cases a direct microphone connection as shown in Figure 14 is adequate. If the microphone level is too low, an external preamp can be added ...

  • Page 26

    AD1885 PC_BEEP INPUT CONNECTIONS The recommended PC_BEEP input circuit is shown below. Under most cases the PC_BEEP signal should be attenuated, filtered and then ac-coupled into the Codec. PC_BEEP (FROM ICH) GROUNDING AND LAYOUT To reduce noise and emissions, Analog ...

  • Page 27

    OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 48-Lead Thin Plastic Quad Flatpack (LQFP) (ST-48) 0.063 (1.60) MAX 0.354 (9.00) BSC 0.030 (0.75) 0.057 (1.45) 0.276 (7.0) BSC 0.030 (0.75) 0.018 (0.45) 0.053 (1.35) 0.018 (0.45 SEATING PLANE ...