AD1888JSTZ Analog Devices Inc, AD1888JSTZ Datasheet - Page 28

• Manufacturer Part Number: AD1888JSTZ
• Description: IC CODEC AUDIO-PC AC'97 48LQFP
• Manufacturer: Analog Devices Inc
• Series: SoundMAX®r
• Type: Audio Codec '97r

Specifications of AD1888JSTZ

• 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: Lead free / RoHS Compliant

AD1888
Table 43. Miscellaneous Control Bit Register (Index 76h)
Reg
No.
76h
MBG[1:0]
VREFD
VREFH
SRU
LOSEL
SPRD
Name
Misc
Control
Bits
MIC Boost Gain Select Register.
These two bits allow changing the MIC preamp gain from the nominal 20 dB gain. Both MIC1/MIC2 and MIC2 preamps will be
set to the same selected gain.
Note that this gain takes effect only while Bit D6 (M20) on the MIC volume register (0Eh) is set to 1; otherwise, the MIC boost
block has a gain of 0 dB.
00 = 20 dB gain (reset default)
01 = 10 dB gain
10 = 30 dB gain
11 = reserved
V
Note that this bit overrides the VREFH bit selection (see below).
0 = V
1 = V
V
0 = V
1 = V
Sample Rate Unlock. Controls DAC sample rate locking.
0 = All DAC sample rates are locked to the front sample rate (reset default)
1 = DAC sample rates can be set independently for front, surround, and LFE.
LINE_OUT Amplifiers Input Select. This bit allows the LINE_OUT output amplifiers to be driven by the mixer or the surround
DACs. The main purpose for this is to allow swapping of the front and surround channels to make better use of the
SURR/HP_OUT output amplifiers. This bit should normally be used in tandem with the HPSEL bit (see below).
0 = LINE_OUT amplifiers are driven by the mixer outputs (reset default).
1 = LINE_OUT amplifiers are driven by the surround DAC outputs.
SPREAD Enable. This bit enables spreading of 2-channel media to all six output channels. This function is implemented in the
analog section by using the output selector controls line for the center/LFE, surround, and Line_out output channels. Note that
the Jack Sense pins can also be set up to control (gate) this function, depending on the JSSPRD bit (see Register 72h).
0 = No spreading occurs unless activated by the Jack Senses and JSSPRD bits (reset default).
1 = The SPRD selector drives the center and LFE outputs from the MONO_OUT, the HPSEL selector drives the SURR/HP_OUT
outputs from the mixer outputs, and the LOSEL selector drives the LINE_OUT outputs also from the mixer outputs.
Note that the SPRD bit overrides the current output selector control lines set up by bits LOSEL and HPSEL as follows: LOSEL = 0
and HPSEL = 1.
REFOUT
REFOUT
D15
DACZ
REFOUT
REFOUT
REFOUT
REFOUT
Disable. Disables V
High. Changes V
D14
AC97NC
pin is driven by the internal reference (reset default).
pin is placed into High-Z out mode.
pin is set to 2.25 V output (reset default).
pin is set to 3.70 V output.
D13
MSPLT
REFOUT
REFOUT
D12
LODIS
from 2.25 V to 3.70 V for PC2001 compliant MIC bias applications.
, placing it into High-Z out mode.
D11
CLDIS
D10
HPSEL
Rev. A | Page 28 of 32
D9
DMIX1
D8
DMIX0
D7
SPRD
D6
X
D5
LOSEL
SRU
D4
VREFH
D3
D2
VREFD
MBG1
D1
MBG0
D0
Default
0000h