AD1888JST Analog Devices Inc, AD1888JST Datasheet - Page 13

• Manufacturer Part Number: AD1888JST
• Description: IC CODEC AUDIO-PC AC'97 48LQFP
• Manufacturer: Analog Devices Inc
• Series: SoundMAX®r
• Type: Audio Codec '97r

Specifications of AD1888JST

• Data Interface: Serial
• Resolution (bits): 16, 20 b
• Number Of Adcs / Dacs: 2 / 6
• Sigma Delta: No
• Dynamic Range, Adcs / Dacs (db) Typ: 80 / 90
• Voltage - Supply, Analog: 4.75 V ~ 5.25 V
• Voltage - Supply, Digital: 3.15 V ~ 3.45 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Single Supply Voltage (typ): 3.3/5V
• Single Supply Voltage (min): 3.15/4.75V
• Single Supply Voltage (max): 3.45/5.25V
• Package Type: LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Table 9. Headphones Volume Register (Index 04h)
Reg No.
04h
Table 10. Volume Settings for Master and Headphone
Reg. 76h
MSPLT
0
0
0
0
0
1
1
1
1
Table 11. Mono Volume Register (Index 06h)
Reg
No.
06h
1
MV[5:0]
MVM
Table 12. Volume Settings for Mono
D15
0
0
0
1
x in the above table is a wild card and has no effect on the value.
For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels. If
MSPLT is not set, Bit D7 has no effect.
x in the above table is don’t care.
Refer to Table 12 for examples. This register controls the Mono output volume and mute bit. The volume register contains five bits, generating 32 volume levels with
31 steps of 1.5 dB each. Because AC ’97 defines 6-bit volume registers, to maintain compatibility, whenever the D5 bit is set to 1, their 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. All registers not shown and bits containing an X
are assumed to be reserved.
T
1
Name
Mono
Volume
Name
Headphone
Volume
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
0
0
0
0
1
0
1
1
WRITE
0 0000
0 1111
1 1111
x xxxx
D15
MVM
WRITE
00 0000
00 1111
01 1111
1x xxxx
xx xxxx
1x xxxx
xx xxxx
xx xxxx
HPM
D15
D14
X
D14
X
Left Channel Volume D[13:8]
READBACK
00 0000
00 1111
01 1111
01 1111
xx xxxx
01 1111
xx xxxx
xx xxxx
D13
X
D13
LHV5
Control Bits D[4:0] for Mono (06h)
D12
X
D12
LHV4
0 dB Gain
−22.5 dB Gain
−46.5 dB Gain
−46.5 dB Gain
Function
−46.5 dB Gain
−∞ dB Gain, Muted
−∞ dB Gain, Left only Muted
−∞ dB Gain, Left Muted
READBACK
0 0000
0 1111
1 1111
x xxxx
Master Volume (02h) and Headphone Volume (04h)
D11
X
D11
LHV3
D10
LHV2
D10
X
Rev. A | Page 13 of 32
D9
LHV1
D9
X
D8
X
Control Bits
D8
LHV0
D7
X
D7
HPRM
D7
x
x
x
x
x
1
0
1
D6
X
1
1
X
D6
WRITE
00 0000
00 1111
01 1111
1x xxxx
xx xxxx
xx xxxx
xx xxxx
xx xxxx
D5
MV5
1
D5
RHV5
Right Channel Volume D[5:0]
Function
0 dB Gain
−22.5 dB Gain
−46.5 dB Gain
−∞ dB Gain, Muted
D4
MV4
D4
RHV4
xx xxxx
READBACK
00 0000
00 1111
01 1111
01 1111
xx xxxx
xx xxxx
xx xxxx
D3
MV3
D3
RHV3
D2
MV2
D2
RHV2
Function
0 dB Gain
−22.5 dB Gain
−46.5 dB Gain
−46.5 dB Gain
−∞ dB Gain, Muted
−∞ dB Gain, only
Right Muted
−46.5 dB Gain
−∞ dB Gain, Right Muted
D1
MV1
D1
RHV1
MV0
D0
D0
RHV0
AD1888
Default
8000h
Default
8000h