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PDF ( 数据手册 , 数据表 ) VT1616

零件编号 VT1616
描述 6-Channel AC97 Codec
制造商 VIA
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VT1616 数据手册, 描述, 功能
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VIA
Technologies
Incorporated
VT1616
6-Channel AC97 Codec with S/PDIF
Features
Description
• AC’97 2.2 compliant codec
VIA Technologies’ VT1616TM 20-bit ¦audio
• 20-bit, stereo ADC and 6-channel stereo DACs
codec conforms to the AC’97 2.2 and S/PDIF
• 1 Hz resolution VSR on all channels
• Integrated IEC958 line driver for S/PDIF output
• S/PDIF compressed digital or LPCM audio out
Output specifications. The VT1616 integrates
Sample Rate Converters on all channels and can be
adjusted in 1Hz increments. There is a provision in
hardware for down-mixing the 6 channels into
• Hardware downmix option to 2 channels
stereo when only two end points are available. The
• ADC DC removal for removing recording white noise analog mixer circuitry integrates a stereo
• 4-bit 3D stereo expansion for simulated surround
enhancement to provide a pleasing 3D surround
sound effect for stereo media. This codec is
• 4 stereo, 2 mono analog line-level inputs
designed with aggressive power management to
• Second line-level output with volume control
achieve low power consumption. When used with a
• External Audio Amplifier Control
3.3V analog supply, power consumption is further
• Low Power consumption mode
• Exceeds Microsoft® WHQL logo requirements
• 3.3V digital, 3.3 or 5V analog power supply
reduced. The primary applications for this part are
desktop and portable personal computers
multimedia subsystems. However, it is suitable for
any system requiring 6-channel audio output for
• 48-pin LQFP small footprint package
home theater systems at competitive prices.
PC_BEEP
PHONE
LINE
CD
VIDEO
AUX
MIC1
MIC2
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
RESET#
CENTER
+ LFE
PCM OUT
SRC
DAC
VOL
REAR
SURROUND
PCM OUT
SRC
DAC
VOL MUTE
FRONT PCM OUT
SRC
VOL MUTE
DAC
VOL MUTE
VOL MUTE
VOL MUTE
VOL MUTE
VOL MUTE
M VOL
U
X +20dB
VOL MUTE
AC’97
Digital
Interface
MUTE
M VOLUME
U
X
/MUTE
Σ MASTER
VOLUME
Σ 3D
ΣM
U
X
MONO
VOLUME
Σ
M MASTER
U
INPUT
ADC
X VOLUME
XTL_IN
XTL_OUT
OSC
PCM IN
SRC
Figure 1. Functional Block Diagram
Revision 1.5, October 11, 2002
1
LFE/CENTER
LNL/SR_OUT
LINE_OUT
MONO_OUT
S/PDIF_OUT
Data Sheet







VT1616 pdf, 数据表
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VT1616 6-Channel AC97 Codec with S/PDIF
Register Descriptions
Reset Register (Index 00h)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
– SE4 SE3 SE2 SE1 SE0 ID9 ID8 ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0 6D50h
The Reset register is used to configure the hardware to a known state or to read the ID code of the part. A code was
assigned to VIA Technologies (27 = 11011h) for 3D Stereo Enhancement reflected in SE[4:0]. ID8 and ID6 are set to 1b
to report that the ADC and DAC are 20-bit resolution respectively. The VT1616 supports an alternate line level out with
independent volume control as reflected by ID4=1b. However, since pins 39 and 41 are shared with the Surround DAC
outputs, register 5Ah, bit 15, LVL has to be set to “1”. Writing data to this register will set all the mixer registers to their
default values. For description of the bits set to 0b, refer to AC’97 Rev. 2.2 spec.
Stereo Output Control Register (Index 02h)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
Mute – – ML4 ML3 ML2 ML1 ML0 – – – MR4 MR3 MR2 MR1 MR0 8000h
Mute
ML[4:0]
MR[4:0]
Stereo Output Mute Control
“1” : Mute enabled
“0” : Mute disabled
Master Output (Left Channel) Volume Control
These five bits select the level of attenuation applied to the Left channel of the Stereo Output
signal. The level of attenuation is programmable from 0dB to -46.5dB in 1.5dB increments,
providing a total of 32 programmable levels. Please refer to Table 2 on page 10 for details.
Master Output (Right Channel) Volume Control
These five bits select the level of attenuation applied to the Right channel of the Stereo Output
signal. The level of attenuation is programmable from 0dB to -46.5dB in 1.5dB increments,
providing a total of 32 programmable levels. Please refer to Table 2 on page 10 for details.
Revision 1.5, October 11, 2002
8
Data Sheet







VT1616 equivalent, schematic
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VT1616 6-Channel AC97 Codec with S/PDIF
Record Gain Control Register (Index 1Ch)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
Mute – – – GL3 GL2 GL1 GL0 – – – – GR3 GR2 GR1 GR0 8000h
Mute
GL[3:0]
GR[3:0]
Record Mute Control
“1” : Mute enabled
“0” : Mute disabled
Record Gain Control (Left Channel)
These four bits select the gain applied to the LEFT channel recording source. The gain is
programmable from 0dB to 22.5dB in 1.5dB increments, providing a total of 16 programmable
levels. The gain is set at 0dB when GL[3:0] = 0h.
Record Gain Control (Right Channel)
These four bits select the gain applied to the RIGHT channel recording source. The gain is
programmable from 0dB to 22.5dB in 1.5dB increments, providing a total of 16 programmable
levels. The gain is set at 0dB when GR[3:0] = 0h.
General Purpose Register (Index 20h)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
– – 3D – – – MIX MS LPBK – – – – – – – 0000h
3D 3D Stereo Enhancement
“1” : Enable 3D
“0” : Disable 3D
MIX
Mono Output Mode
“1” : Mic Output
“0” : Mono mix output
MS Microphone Select
“1” : Microphone 2
“0” : Microphone 1
LPBK
Loopback Mode
For this bit to be valid, 5C_0 must be set to “1”. See description of LBE on page 26.
“1” : DAC/ADC Loopback enabled
“0” : DAC/ADC Loopback disabled
Revision 1.5, October 11, 2002
16
Data Sheet










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