參數(shù)資料
型號(hào)： AD1819A
廠商： Analog Devices, Inc.
元件分類： Codec
英文描述： AC97 SoundPort Codec(AC97型聲音端口信號(hào)編解碼器)
中文描述： AC97 SoundPort編解碼器（AC97型聲音端口信號(hào)編解碼器）
文件頁(yè)數(shù)： 19/28頁(yè)
文件大?。?/td> 265K
代理商： AD1819A
AD1819A
–19–
REV. 0
T he AC-Link protocol provides for a special 16-bit time slot (Slot 0) wherein each bit conveys a valid tag for its corresponding time
slot within the current audio frame. A “1” in a given bit position of Slot 0 indicates that the corresponding time slot within the cur-
rent audio frame has been assigned to a data stream, and contains valid data. If a slot is “tagged” invalid, it is the responsibility of the
source of the data, (AD1819A for the input stream, AC ’97 controller for the output stream), to stuff all bit positions with 0s during
that slot’s active time. T he AD1819A stuffs all invalid slots with zeros and ignores invalid input slots.
Additionally, for power savings, all clock, sync, and data signals can be halted.
For multiple codec operations, the AD1819A supports an enhanced mode for communicating with up to two additional codecs. T he
Slave 1 AD1819A codec uses Slots 5 and 6, while Slave 2 uses Slots 7 and 8 as shown in the following diagram.
SLAVE 1
1
2
3
4
5
6
7
8
9
10
11
12
SLOT # ....
SYNC
OUTGOING STREAMS
INCOMING STREAMS
TAG
RSRVD
RSRVD
RSRVD
CMD
CMD
PCM
PCM
PCM
PCM
PCM
PCM
TAG
RSRVD
RSRVD
RSRVD
PCM
LEFT
PCM
RIGHT
PCM
LEFT
PCM
RIGHT
PCM
LEFT
PCM
RIGHT
STATUS
DATA
STATUS
ADR
RSRVD
RSRVD
ENHANCED MODE
SLAVE 2
DATA PHASE
TAG
PHASE
Figure 9. Standard Bidirectional Audio Frame
AC-Link Audio Output Frame (SDAT A_OUT )
T he audio output frame data streams correspond to the multiplexed bundles of all digital output data targeting AD1819A’s DAC
inputs and control registers. As briefly mentioned earlier, each audio output frame supports up to twelve 20-bit outgoing data time
slots. Slot 0 is a special reserved time slot containing 16 bits that are used for AC-Link protocol infrastructure.
Within Slot 0 the first bit is a global bit (SDAT A_OUT Slot 0, Bit 15), which flags the validity for the entire audio frame. If the
“Valid Frame” bit is a 1, this indicates that the current audio frame contains at least one slot time of valid data. T he next 12-bit
positions sampled by AC ’97 indicate which of the corresponding 12 time slots contain valid data. In this way input DAC data
streams of differing sample rates can be transmitted across the AC-Link at its fixed 48 kHz audio frame rate. T he following diagram
illustrates the time-slot-based AC-Link protocol.
END OF PREVIOUS
AUDIO FRAME
TIME SLOT “VALID”
BITS
(1) = TIME SLOT CONTAINS VALID PCM DATA
TAG PHASE
20.8
m
s (48kHz)
DATA PHASE
SLOT 1
SLOT 2
SLOT 3
SLOT 12
SYNC
BIT_CLK
CODEC
READY
SLOT(1) SLOT(2)
SLOT(12)
“0”
“0”
“0”
19
0
19
0
0
0
19
19
12.2888MHz
81.4ns
SDATA_IN
Figure 10. AC-Link Audio Output Frame
A new audio output frame begins with a low-to-high transition of SYNC. SYNC is synchronous to the rising edge of BIT _CLK . On
the immediately following falling edge of BIT _CLK , the AD1819A samples the assertion of SYNC. T his falling edge marks the time
when both sides of AC-Link are aware of the start of a new audio frame. On the next rising edge of BIT _CLK , the AC ’97 controller
transitions SDAT A_OUT into the first bit position of Slot 0 (Valid Frame Bit). Each new bit position is presented to AC-Link on a
rising edge of BIT _CLK , and subsequently sampled by AD1819A on the following falling edge of BIT _CLK . T his sequence ensures
that data transitions, and subsequent sample points for both incoming and outgoing data streams are time aligned.
相關(guān)PDF資料
PDF描述
AD1819BJST AC’97 SoundPort Codec
AD1819 ECONOLINE: RD & RC - Dual Output from a Single Input Rail- 1kVDC & 2kVDC Isolation- Power Sharing on Output- Custom Solutions Available- UL94V-0 Package Material- Efficiency to 86%
AD1819B AC’97 SoundPort Codec
AD1833A 24-Bit, 192 kHz, DAC
AD1833AAST ECONOLINE: RD & RC - Dual Output from a Single Input Rail- 1kVDC & 2kVDC Isolation- Power Sharing on Output- Custom Solutions Available- UL94V-0 Package Material- Efficiency to 86%
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD1819AJST 制造商:Rochester Electronics LLC 功能描述:
AD1819B 制造商:AD 制造商全稱:Analog Devices 功能描述:AC’97 SoundPort Codec
AD1819BJST 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 16-Bit 48-Pin LQFP 制造商:Analog Devices 功能描述:IC CODEC AC'97 VERSION 2.1
AD1819BJST-REEL 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 16-Bit 48-Pin LQFP T/R
AD1819BJSTZ 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 16-Bit 48-Pin LQFP 制造商:Analog Devices 功能描述:Audio CODEC IC
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