AD1985JST Analog Devices Inc, AD1985JST Datasheet - Page 43

• 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

Reg Num
0x66
Function Select Register (Index 0x66, Page 01)
New register added for AC ’97 2.3.
FC[3:0]
T/R
Name
Function Select
Function Code Bits. (Default 0.) These bits specify the type of audio function described by this page.
0x00: DAC 1 (Master Out). Maps to line out L/R, codec Pins 35 and 36.
0x01: DAC 2 (AUX Out). Maps to surround/HP out L/R, codec Pins 39 and 41.
0x02: DAC 3 (Center/LFE). Maps to center/LFE, codec Pins 31 and 32.
0x03: S/P-DIF Out.
0x04: Phone In.
0x05: Mic 1 (Mic Select = 0).
0x06: Mic 2 (Mic Select = 1).
0x07: Line In.
0x08: CD In.
0x09: Video In.
0x0A: Aux In.
0x0B: Mono Out
0x0C to 0x0F: Reserved.
These bits are read/write and represent current AC ’97 2.3 defined I/O capabilities. Software will program the corresponding
I/O number in this field together with the tip/ring selector bit T/R. Once software programs the value and properly reads it
back to confirm selection and implementation, it will access the rest of the bit fields in the descriptor. A read-only value of 0
in this register, along with a read-only value of 0 in the IV (Register 0x68 page 01) bit, indicates the codec does not support
the information and I/O register.
Tip or Ring Selection Bit. (Default is 0.)
This bit sets which jack conductor the sense value is measured from. Software will program the corresponding ring/tip
selector bit together with the I/O number in Bits FC[3:0]. Once software programs the value and properly reads it back to
confirm selection and implementation, it will access the rest of the bit fields in the descriptor.
0: Tip
1: Ring
Mono inputs and outputs report the relevant function and sense information when T/R is set to 0 (tip).
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4
X
X
X
X
Rev. A | Page 43 of 48
X
X
X
X
X
X
X
FC3 FC2 FC1 FC0 T/R 0x0000
D3
D2
D1
D0 Default
AD1985