AD1985JST Analog Devices Inc, AD1985JST Datasheet - Page 11

• Manufacturer Part Number: AD1985JST
• Description: IC CODEC STEREO 6-DAC 20B 48LQFP
• Manufacturer: Analog Devices Inc
• Series: SoundMAX®r
• Type: Audio Codec '97r

Specifications of AD1985JST

• Rohs Status: RoHS non-compliant
• Data Interface: Serial
• Resolution (bits): 16, 20 b
• Number Of Adcs / Dacs: 2 / 6
• Sigma Delta: No
• Dynamic Range, Adcs / Dacs (db) Typ: 84 / 90
• Voltage - Supply, Analog: 4.5 V ~ 5.5 V
• Voltage - Supply, Digital: 2.97 V ~ 3.63 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Circuit Layout Note: In normal operation, Surround and Line Out are swapped to provide headphone drive on line outputs. Therefore, Pins 35 and 36 become the
surround L/R outputs and Pins 39 and 41 become the Line Out (Front) L/R outputs with headphone drive. See Bits LOSEL and HPSEL in Register 0x76 for details.
PIN FUNCTION DESCRIPTIONS
Table 17. Digital I/O
Mnemonic
XTL_IN
XTL_OUT
SDATA_OUT
BIT_CLK
SDATA_IN
SYNC
RESET
SPDIF
Table 18. Chip Selects/Clock Strapping
Mnemonic
ID0
ID1
Table 19. Jack Sense/EAPD
Mnemonic
EAPD
JS0
JS1
JS2
JS3
Pin No.
2
3
5
6
8
10
11
48
Pin No.
45
46
Pin No.
47
17
16
33
12
I/O
I
O
I
O/I
O
I
I
O
I/O
I
I
Type
O
I
I
I
I
SDATA_OUT
SDATA_IN
XTL_OUT
BIT_CLK
Description
Crystal Input (24.576 MHz) or External Clock In (24.576 MHz, 14.31818 MHz, or 48.000 MHz).
Crystal Output.
AC Link Serial Data Output. AD1985 input stream.
AC Link Bit Clock. 12.288 MHz serial data clock. (Input pin, for secondary mode only.)
AC Link Serial Data Input. AD1985 output stream.
AC Link Frame Sync.
AC Link Reset. AD1985 master hardware reset.
SPDIF Output.
Description
EAPD Output.
JACK SENSE 0 Input.
JACK SENSE 1 Input.
JACK SENSE 2 Input.
JACK SENSE 3 Input.
Description
Chip Select Input 0 (Active Low).
This pin can also be used as the chain input from a secondary codec.
Chip Select Input 1 (Active Low).
XTL_IN
RESET
DV
DV
DV
DV
SYNC
JS3
DD1
DD2
SS1
SS2
10
11
12
1
2
3
4
5
6
7
8
9
48 47 46 45 44
13 14 15 16 17 18 19 20 21 22 23 24
PIN 1
IDENTIFIER
Figure 10. 48-Lead LQFP Pin Configuration
(Not to Scale)
AD1985
TOP VIEW
43 42 41 40
Rev. A | Page 11 of 48
39 38 37
36
35
34
33
32
31
30
29
28
27
26
25
NC = NO CONNECT
LINE_OUT_R (FRONT)/SURR_R
LINE_OUT_L (FRONT)/SURR_L
AV
JS2
LFE_OUT
CENTER_OUT
AFILT2
AFILT1
V
V
AV
AV
REFOUT
REF
DD4
SS1
DD1
AD1985