AD1888JCP-REEL Analog Devices Inc, AD1888JCP-REEL Datasheet - Page 23

• Manufacturer Part Number: AD1888JCP-REEL
• Description: IC CODEC AUDIO-PC AC'97 48LFCSP
• Manufacturer: Analog Devices Inc
• Series: SoundMAX®r
• Type: Audio Codec '97r

Specifications of AD1888JCP-REEL

• 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-VFQFN, CSP Exposed Pad
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Table 34. PCM ADC Rate Register (Index 32h)
Reg
No.
32h
This read/write sample rate control register contains 16-bit unsigned value, representing the rate of operation in Hz.
SRF[15:0]
Table 35. CENTER/LFE Volume Control Register (Index 36h)
Reg
No.
36h
1
All registers not shown and bits containing an X are assumed to be reserved.
Refer to Table 36 for examples. This register controls the LFE output volume and mute bit. The volume registers contain five bits, generating 32 volume levels with 31
steps of 1.5 dB each. If MSPLT is not set, Bit D7 has no effect.
Note that depending on the state of the AC97NC bit in Register 76h, this register operates as follows:
CNT[5:0]
CM
LFE[5:0]
LM
Table 36. Settings for Center/LFE Register
D15/D7
0
0
0
0
1
Table 37. Surround Volume Control Register (Index 38h)
Reg
No.
38h
1
Note that depending on the state of the AC97NC bit in Register 76h, this register operates as follows:
RSR[5:0]
MUTE_R
LSR[5:0]
MUTE_L
Because AC ’97 defines 6-bit volume registers, to maintain compatibility, whenever the D5 or D13 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.
For AC97NC = 0, the register controls the center and LFE output pin attenuators. Range is 0 dB to −46.5 dB.
For AC97NC = 1, the register controls the center and LFE DAC gain/attenuators. Range is +12 dB to −34.5 dB.
Refer to Table 37 for examples. This register controls the surround volume controls for both stereo channels and mute bits. Each volume subregister 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 or D13 Bit is set to
1, its respective lower five volume bits are automatically set to 1 by the coded logic. On readback , all lower five bits will read 1s whenever these bits are set to 1.
For AC97NC = 0, the register controls the surround output pin attenuators. Range is 0 dB to −46.5 dB.
For AC97NC = 1, the register controls the surround DAC gain/attenuators. Range is +12 dB to −34.5 dB.
Name
Center/LFE
Volume
Name
PCM L/R
ADC
Rate
Surround
Name
Volume
Sample Rate
The sampling frequency range is from 7 kHz (1B58h) to 48 kHz (BB80h) in 1 Hz increments. If zero is written to EVRA, the
sample rate is reset to 48 kHz.
WRITE
00 0000
00 1111
01 1111
1x xxxx
xx xxxx
Right Surround Volume Mute. When this bit is set to 1, the right channel is muted.
Left Surround Volume Control
Left Surround Volume Mute. When this bit is set to 1, the left channel is muted.
D15
SRA15
Right Surround Volume Control
D15
LM
Center Volume Control
Center Volume Mute. When this bit is set to 1, the channel is muted.
LFE Volume Control
LFE Volume Mute. When this bit is set to 1, the channel is muted.
CENTER D[5:0] and LFE D[13:8]
D15
MUTE_L
D14
SRA14
D14
X
D14
X
D13
SRA13
D13
LFE5
READBACK
00 0000
00 1111
01 1111
01 1111
xx xxxx
1
D13
LSR5
D12
LFE4
D12
SRA12
1
D12
LSR4
D11
LFE3
D11
SRA11
D11
LSR3
CENTER and LFE Volume (36h)
D10
LFE2
D10
SRA10
D10
LSR2
Function with AC97NC = 0
0 dB Gain
−22 dB Gain
−46.5 dB Gain
−46.5 dB Gain
Muted
Rev. A | Page 23 of 32
D9
LFE1
Control Bits
D9
SRA9
D9
LSR1
D8
LFE0
D8
SRA8
D8
LSR0
D7
CM
D7
SRA7
D7
MUTE_R
D6
X
D6
SRA6
D5
CNT5
D6
X
1
D5
SRA5
D5
RSR5
D4
CNT4
1
D4
SRA4
D4
RSR4
Function with AC97NC = 1
12 dB Gain
−10.5 dB Gain
−34.5 dB Gain
Muted
Not Applicable
D3
CNT3
D3
SRA3
D3
RSR3
D2
CNT2
D2
SRA2
D2
RSR2
D1
CNT1
D1
SRA1
D1
RSR1
D0
CNT0
SRA0
D0
D0
RSR0
AD1888
Default
8080h
Default
BB80h
Default
8080h