IDTSTAC9758XXTAEB1XR IDT, Integrated Device Technology Inc, IDTSTAC9758XXTAEB1XR Datasheet - Page 54

• Manufacturer Part Number: IDTSTAC9758XXTAEB1XR
• Description: IC CODEC AC'97 6CH 2.3 48-TQFP
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Audio Codec '97r

Specifications of IDTSTAC9758XXTAEB1XR

• Data Interface: Serial
• Resolution (bits): 20 b
• Number Of Adcs / Dacs: 2 / 3
• Sigma Delta: Yes
• Voltage - Supply, Analog: 3.14 V ~ 3.47 V; 4.75 V ~ 5.25 V
• Voltage - Supply, Digital: 3.14 V ~ 3.47 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFP, 48-VQFP
• 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: Lead free / RoHS Compliant
• Other names: STAC9758XXTAEB1XR

IDT™
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
STAC9758/9759
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
8.2.6.
8.2.7.
Bit(s) Reset Value R/W
15
Mute
D15
D7
Digital PC Beep
The AC’97 2.3 specification calls for the CODEC to generate a square wave tone at a particular vol-
ume and frequency. Typically, the BIOS will program this register during the Power On Self Test
(POST) cycle.
To create a tone using Digital PC Beep, write a non-zero value to the F Bits in Reg 0Ah (bits
D12:D5). The beep frequency is the result of dividing the 48KHz clock by 4 times the number spec-
ified in F[7:0], allowing tones from 47Hz to 12KHz. (see Table18: page54). Set the PV bits in Reg
0Ah, (Bits D4:D1) control the volume level from 0 to 45dB of attenuation in 3dB steps. Unmute bit
D15 if necessary.
To stop the tone, write 801Fh to Reg 0Ah. This turns off the generator, turns the volume to the low-
est setting, and mutes the register.
Applying a signal to the PC Beep pin, pin 12, may cause the digital PC Beep signal to become dis-
torted or inaudible. When using the digital PC Beep feature, leave the PC Beep input pin connected
to analog ground through a capacitor. Connecting a capacitor from the PC Beep input pin to ground
will create a more pleasing sound by changing the digital output to a more sinusoidal like output.
Typically this feature will be used exclusively by the BIOS, and will not be used by Controller or
Driver.
Phone Volume (0Ch)
Default: 8008h.
1
RESERVED
D14
Value
D6
100
127
255
10
25
50
1
RW
Name
Mute
D13
D5
0 = no mute
1 = mute phone
Table 18. Digital PC Beep Examples
Reg 0Ah [D12:D5]
GN4
D12
54
D4
0x0A
0x0F
0xFF
0x01
0x19
0x32
0x64
RESERVED
GN3
D11
D3
Description
STAC9758/9759
GN2
D10
D2
Frequency
12,000Hz
94.48 Hz
47.05 Hz
1200Hz
480 Hz
240 Hz
120 Hz
GN1
D9
D1
PC AUDIO
GN0
V 1.2 1206
D8
D0