AD1985JST Analog Devices Inc, AD1985JST Datasheet - Page 32

• 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

AD1985
SPDIF Control Register (Index 0x3A)
Reg.Num.
0x3A
Register 0x3A is a read/write register that controls SPDIF
functionality and manages bit fields propagated as channel
status (or subframe in the V case). With the exception of V, this
register should only be written to when the SPDIF transmitter is
disabled (SPDIF bit in Register 0x2A is 0). This ensures that
control and status information initialize correctly at the
beginning of SPDIF transmission.
PRO
AUD
COPY
PRE
CC[6:0]
L
SPSR[1:0]
V
Name
SPDIF Control
Professional. 1 indicates professional use of channel status, 0 indicates consumer.
Nonaudio. 1 indicates data is nonPCM format, 0 indicates data is PCM.
Copyright. 1 indicates copyright is asserted, 0 indicates copyright is not asserted.
Pre-emphasis. 1 indicates filter pre-emphasis is 50/15 µs, 0 indicates no pre-emphasis.
Category Code. Programmed according to IEC standards, or as appropriate.
Generation Level. Programmed according to IEC standards, or as appropriate.
SPDIF Transmit Sample Rate.
SPSR[1:0] = 00: Transmit Sample Rate = 44.1 kHz.
SPSR[1:0] = 01: Reserved.
SPSR[1:0] = 10: Transmit Sample Rate = 48 kHz (default).
SPSR[1:0] = 11: Not supported.
Validity. This bit affects the Validity flag (Bit <28> transmitted in each SPDIF L/R subframe) and enables the
SPDIF transmitter to maintain connection during error or mute conditions.
V = 1: Each SPDIF subframe (L+R) has Bit <28> set to 1. This tags both samples as invalid.
V = 0: Each SPDIF subframe (L+R) has Bit <28> set to 0 for valid data and 1 for invalid data (error condition).
Note that when V = 0, asserting the VFORCE bit (D15) in Register 0x2A (Extended Audio Stat/Ctrl) will force
the Validity flag low, marking both samples as valid.
D15 D14 D13
V
X
SPSR1 SPSR0 L
D12
D11 D10 D9
Rev. A | Page 32 of 48
CC6 CC5 CC4 CC3 CC2 CC1 CC0 PRE COPY AUD PRO 0x2000
D8
D7
D6
D5
D4
D3 D2
D1
D0
Default