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PCM1774 Fiches technique(PDF) 16 Page - Texas Instruments

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No de pièce PCM1774
Description  16-Bit, Low-Power Stereo Audio DAC With Analog Mixing, Line and Headphone Outputs
PDF  49 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

PCM1774 Fiches technique(HTML) 16 Page - Texas Instruments

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Audio Data Formats and Timing
DIN
BCK
LRCK
50%ofV
IO
tw(BCH)
tw(BCL)
t(LB)
50%ofV
IO
50%ofV
IO
tw(BCY)
t(BL)
t(DS)
t(DH)
PCM1774
SLAS551 – JULY 2007
The PCM1774 supports I2S, right-justified, left-justified, and DSP formats. The data formats are shown in
Figure 16 and are selected using registers 70 and 81 (RFM[1:0], PFM[1:0]). All formats require binary
2s-complement, MSB-first audio data. The default format is I2S. Figure 14 shows a detailed timing diagram.
PARAMETERS
MIN
MAX
UNITS
BCK pulse cycle time (I2S, left- and right-justified formats)
1/(64 fS)
(1)
t(BCY)
BCK pulse cycle time (DSP format)
1/(256 fS)
(1)
tw(BCH)
BCK high-level time
35
ns
tw(BCL)
BCK low-level time
35
ns
t(BL)
BCK rising edge to LRCK edge
10
ns
t(LB)
LRCK edge to BCK rising edge
10
ns
t(DS)
DIN set up time
10
ns
t(DH)
DIN hold time
10
ns
tr
Rising time of all signals
10
ns
tf
Falling time of all signals
10
ns
(1)
fS is the sampling frequency.
Figure 14. Audio Interface Timing (Slave Mode)
16
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