ad1985jstz-reel Analog Devices, Inc., ad1985jstz-reel Datasheet - Page 18

• Manufacturer Part Number: ad1985jstz-reel
• Description: Ac ?97 Soundmax Codec
• Manufacturer: Analog Devices, Inc.

Reg Name
0x0A PC Beep Volume PCBM X
AD1985
PC Beep Register (Index 0x0A)
This register controls the level and frequency for the digital PC beep generated by the codec. Please note that PC Beep should be muted
when not in use.
PCBV[3:0]
PCBF[7:0]
The register default value is 0x8000, which corresponds to 0 dB attenuation with mute on.
PCBM
0
0
1
PCBF
0x00
0x01
0x0C
0xFF
Frequency of PC Beep
PC Beep Disabled
12 kHz
1 kHz
47 Hz
PV3 to PV0
0000
1111
xxxx
D15 D14 D13 D12
Function
0 dB Attenuation
45 dB Attenuation
∞ dB Attenuation
Controls the volume of the generated signal. Each step corresponds to approximately 3 dB of attenuation. The
MSB of the register is the mute bit. When this bit is set to 1, the level for the signal is set at –∞ dB.
These bits are writeable, and the codec-digital PC beep generation is supported. The beep frequency generated
is the result of dividing the 48 kHz clock by 4x the number specified in PCBF[7:0], allowing tones from 47 Hz to
12 kHz. A value of 0x00 in Bits PCBF[7:0] disables internal PC beep generation. The PV bits control the volume
level of the generated signal.
X
PCBF7 PCBF6 PCBF5 PCBF4 PCBF3 PCBF2 PCBF1 PCBF0 PCBV3 PCBV2 PCBV1 PCBV0 X 0x8000
D11
D10
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D9
D8
D7
D6
D5
D4
D3
D2
D1
D0 Default