AD1985JST Analog Devices Inc, AD1985JST Datasheet - Page 17

• 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
0x06
Mono Volume Register (Index 0x06)
This register controls the mono output volume and mute bit.
The volume register contains five bits, generating 32 volume
levels with increments of 1.5 dB each.
Volume Settings for Mono
D15
0
0
0
1
Note that the x in the above table is a wild card, meaning the value has no effect.
MV[4:0]
MVM
Control Bits D[4:0] for Mono (0x06)
Write
0 0000
0 1111
1 1111
x xxxx
Name
Mono Volume
Readback
0 0000
0 1111
1 1111
x xxxx
Mono Volume Control. The least significant bit represents 1.5 dB. This register controls the output from 0 dB to
a maximum attenuation of 46.5 dB.
Mono Volume Mute. When this bit is set to 1, the channel is muted.
D15
MVM
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4
X
Function
0 dB Gain
–22.5 dB Gain
–46.5 dB Gain
–∞ dB Gain, Muted
X
X
Rev. A | Page 17 of 48
X
X
X
AC ’97 defines the 6-bit volume registers, therefore, to maintain
compatibility whenever the D5 bit is set to 1, its respective lower
five volume bits are automatically set to 1 by the codec logic. On
readback, all lower five bits will read 1s whenever this bit is set
to 1.
X
X
X
X
MV4 MV3 MV2 MV1 MV0 0x8000
D3
D2
D1
D0
AD1985
Default