AD1985JST Analog Devices Inc, AD1985JST Datasheet - Page 20

• 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
0x10
Reg Num
0x12
AD1985
Line In Volume (Index 0x10)
1
channels.
RLV[4:0]
LVRM
LLV[4:0]
LM
Volume Settings for Line In, CD Volume, AUX, and PCM Out
Reg. 0x76
MSPLT
0
0
0
0
1
1
1
1
MSPLT is not set, RM bit has no effect.
Note that the x in the above table is a wild card, meaning the value has no effect.
CD Volume Register (Index 0x12)
1
channels. See the Volume Settings for Line In, CD Volume, AUX, and PCM Out table.
RCV[4:0]
CDRM
LCV[4:0]
CM
For AC ’97 compatibility, Bit D7 (LVRM) is available only by setting the MSPLT bit in Register 0x76. The MSPLT bit enables separate mute bits for the left and right
For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 0x76. The MSPLT bit enables separate mute bits for the left and right channels. If
For AC97 compatibility, Bit D7 (CDRM) is available only by setting the MSPLT bit in Register 0x76. The MSPLT bit enables separate mute bits for the left and right
1
Name
Line In Volume
Name
CD Volume
D15
0
0
0
1
0
1
1
Write
0 0000
0 1000
1 1111
x xxxx
1 1111
x xxxx
x xxxx
D15 D14 D13 D12 D11
CM X
Right Line In Volume. Allows setting the line in right channel gain/attenuator to one of 32 levels. The LSB
represents 1.5 dB, and the gain range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
Right Channel Mute. Once enabled by the MSPLT bit in Register 0x76, this bit mutes the right channel
separately from the LM bit. Otherwise, this bit will always read 0 and will have no effect when set to 1.
Line In Volume Left. Allows setting the line in left channel gain/attenuator to one of 32 levels. The LSB
represents 1.5 dB, and the gain range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
Line In Mute. When this bit is set to 1, both the left and right channels are muted, unless the MSPLT bit in
Register 0x76 is set to 1, in which case, this mute bit will affect only the left channel.
Right CD Volume. Allows setting the CD right channel gain/attenuator to one of 32 levels. The LSB represents
1.5 dB, and the gain range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
Right Channel Mute. Once enabled by the MSPLT bit in Register 0x76, this bit mutes the right channel
separately from the CM bit. Otherwise, this bit will always read 0 and will have no effect when set to 1.
Left CD Volume. Allows setting the CD left channel gain/attenuator to one of 32 levels. The LSB represents
1.5 dB, and the gain range is +12 dB to –34.5 dB. The default value is 0 dB, mute enabled.
CD Volume Mute. When this bit is set to 1, both the left and right channels are muted, unless the MSPLT bit in
Register 0x76 is set to 1, in which case, this mute bit will only affect the left channel.
Left Channel Volume D[12:8]
Readback
0 0000
0 1000
1 1111
x xxxx
1 1111
x xxxx
x xxxx
D15 D14 D13 D12 D11 D10 D9
LM X
X
X
LCV4 LCV3 LCV2 LCV1 LCV0 CDRM
Function
12 dB Gain
0 dB Gain
–34.5 dB Gain
–∞ dB Gain, Muted
–34.5 dB Gain
Line In (0x10), CD (0x12), AUX (0x16), and PCM Out (0x18)
–∞ dB Gain, Only Left Muted
–∞ dB Gain, Left Muted
LLV4 LLV3 LLV2 LLV1 LLV0 LVRM
D10 D9
Rev. A | Page 20 of 48
Control Bits
D8
D8
D7
x
x
x
x
1
0
1
D7
D7
1
1
Write
0 0000
0 1000
1 1111
x xxxx
x xxxx
1 1111
x xxxx
1
D6 D5 D4
X
D6 D5 D4
X X RLV4 RLV3 RLV2 RLV1 RLV0 0x8808
X
Right Channel Volume D[4:0]
Readback
0 0000
0 1000
1 1111
x xxxx
x xxxx
1 1111
x xxxx
RCV4 RCV3 RCV2 RCV1 RCV0 0x8808
D3
D3
D2
Function
12 dB Gain
0 dB Gain
–34.5 dB Gain
–∞ dB Gain, Muted
–∞ dB Gain, Only Right Muted
–34.5 dB Gain
–∞ dB Gain, Right Muted
D2
D1
D1
D0
D0
Default
Default