STAC9750XXTAEC1X IDT, Integrated Device Technology Inc, STAC9750XXTAEC1X Datasheet - Page 40

• Manufacturer Part Number: STAC9750XXTAEC1X
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of STAC9750XXTAEC1X

• Single Supply Voltage (typ): 3.3/5V
• Single Supply Voltage (min): 3.135V
• Single Supply Voltage (max): 3.465/5.25V
• Package Type: TQFP
• Lead Free Status / RoHS Status: Compliant

IDT™
VALUE-LINE TWO-CHANNEL AC’97 CODECS
STAC9750/9751
VALUE-LINE TWO-CHANNEL AC’97 CODECS
6.5.8.
D15
D7
This register is used to control some miscellaneous functions. Below is a summary of each bit and its
function. The MS bit controls the MIC selector. The LPBK bit enables loopback of the ADC output to
the DAC input without involving the AC-Link, allowing for full system performance measurements.
3D Control (22h)
Default: 0000h
This register is used to control the 3D stereo enhancement function, IDT Surround 3D (SS3D), built
into the AC'97 component. Note that register bits DP3-DP2 are used to control the separation ratios
in the 3D control for LINE_OUT. SS3D provides for a wider soundstage extending beyond the nor-
mal 2-speaker arrangement. Note that the 3D bit in the general purpose register (20h) must be set to
1 to enable SS3D functionality and for the bits in 22h to take effect.
The three separation ratios are implemented as shown in Table 22. The separation ratio defines a
series of equations that determine the amount of depth difference (High, Medium, and Low) per-
ceived during two-channel playback. The ratios provide for options to narrow or widen the sound-
stage.
POP BYP
D14
D6
LPBK
MIX
MS
Bit
3D
Reserved
DP3, DP2
0 0
0 1
1 0
1 1
D13
D5
ADC/DAC loopback mode
3D Stereo Enhancement ON/OFF - 1 = on
Mono output select - 0 = Mix, 1= Mic
Mic select - 0 = Mic1, 1 = Mic2
DAC bypasses mixer and connects directly to Line Out
Table 21. General Purpose Register
Table 22. 3D Control Registers
D12
40
D4
Reserved
DP3
D11
D3
LINE_OUT SEPARATION RATIO
Function
STAC9750/9751
DP2
D10
D2
4.5 (Med)
6 (High)
3 (Low)
0 (Off)
D9
D1
Reserved
PC AUDIO
V 5.8 103106
D8
D0