參數(shù)資料
型號(hào)： SRC4194IPAG
英文描述： 4-Channel, Asynchronous Sample Rate Converter
中文描述： 4通道，異步采樣率轉(zhuǎn)換器
文件頁(yè)數(shù)： 36/40頁(yè)
文件大?。?/td> 502K
代理商： SRC4194IPAG
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SBFS025A JUNE 2004 REVISED JULY 2004
www.ti.com
36
TDM APPLICATIONS
The SRC4194 supports a TDM output mode, which allows
multiple devices to be daisy-chained together to create a
serial frame. Each device occupies one sub-frame within
a frame, and each sub-frame carries two channels (Left
followed by Right). Each sub-frame is 64 bits long, with 32
bits allotted for each channel. The audio data for each
channel is left-justified within the allotted 32 bits. Figure 16
illustrates the TDM frame format, while Figure 15 shows
TDM input timing parameters, which are listed in the
Electrical Characteristics table of this data sheet.
t
LROS
t
TDMS
t
LROH
t
TDMH
LRCKO
BCKO
TDMI
Figure 15. Input Timing for TDM Mode
The frame rate is equal to the output sampling frequency,
f
s
. The BCKO frequency for the TDM interface is N
×
64f
s
,
where N is the number of SRC sections included in the
daisy-chain. For Master mode, the output BCKO
frequency is fixed to the reference clock input frequency.
The number of devices that can be daisy-chained in TDM
mode is dependent upon the output sampling frequency
and the bit clock frequency, leading to the following
numerical relationship.
Number of Daisy-Chained SRC Sections = (f
BCKO
/f
s
)/64
Where:
f
BCKO
= Output Port Bit Clock (BCKO), 27MHz maximum
f
s
= Output Port Sampling (or LRCKO) Frequency, 212kHz
maximum.
This relationship holds true for both Slave and Master
modes.
Figure 17 and Figure 18 show typical connection schemes
for TDM mode. Although the TMS320C671x DSP family is
shown as the audio processing engine in these figures,
other TI digital signal processors with a multi-channel
buffered serial port (McBSP
) may also function with this
arrangement. Interfacing to processors from other
manufacturers is also possible. Refer to the timing
diagrams in this data sheet, along with the equivalent
serial port timing diagrams shown in the DSP data sheet
to determine compatibility.
LRCKO
BCKO
SDOUT
N = Number of DaisyChained Devices
One SubFrame contains 64 bits, with 32 bits per channel.
For each channel, the audio data is LeftJustified, MSBfirst format, with the word length determined by the OWL[1:0] pins/bits.
Left
Right
SubFrame 1
SubFrame 2
SubFrame N
One Frame = 1/f
s
Left
Right
Left
Right
Figure 16. TDM Frame Format
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SRC4194IPAG 制造商:Texas Instruments 功能描述:IC SAMPLE RATE CONV 4CH 64-TQFP
SRC4194IPAGG4 功能描述:音頻采樣頻率轉(zhuǎn)換器 4-Channel Async Sample Rate Conv RoHS:否 制造商:Texas Instruments THD + 噪聲:- 140 dB 接口:I2C, SPI 工作電源電壓:1.65 V to 2 V / 3 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:TQFP-48 安裝風(fēng)格:SMD/SMT
SRC4194IPAGR 功能描述:音頻采樣頻率轉(zhuǎn)換器 4-Ch Asynch Sample Rate Converter RoHS:否 制造商:Texas Instruments THD + 噪聲:- 140 dB 接口:I2C, SPI 工作電源電壓:1.65 V to 2 V / 3 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:TQFP-48 安裝風(fēng)格:SMD/SMT
SRC4194IPAGRG4 功能描述:音頻采樣頻率轉(zhuǎn)換器 4-Ch Asynch Sample Rate Converter RoHS:否 制造商:Texas Instruments THD + 噪聲:- 140 dB 接口:I2C, SPI 工作電源電壓:1.65 V to 2 V / 3 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:TQFP-48 安裝風(fēng)格:SMD/SMT
SRC4194IPAGT 功能描述:音頻采樣頻率轉(zhuǎn)換器 4-Channel Async Sample Rate Conv RoHS:否 制造商:Texas Instruments THD + 噪聲:- 140 dB 接口:I2C, SPI 工作電源電壓:1.65 V to 2 V / 3 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:TQFP-48 安裝風(fēng)格:SMD/SMT
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