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| PCM1681 Datasheet, PDF (18/43 Pages) Texas Instruments – 24-Bit, 192-kHz Sampling, Enhanced Multilevel Delta-Sigma, Eight-Channel Audio Digital-to-Analog Converter | |||
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PCM1681
PCM1681-Q1
SLES211B â FEBRUARY 2008 â REVISED JUNE 2008.................................................................................................................................................... www.ti.com
LRCK
t(LRW)
1.4 V
t(BCH)
t(BCL) t(LH)
t(LS)
BCK
DATA1, DATA2,
DATA3, DATA4
t(BCY)
t(DS)
t(DH)
1.4 V
1.4 V
PARAMETER
MIN
TYP
MAX
t(BCY) BCK cycle time
75(1)
t(BCH) BCK pulse duration HIGH
35
t(BCL) BCK pulse duration LOW
LRCK pulse duration HIGH, right-justified, I2S, left-justified
35
1/2 fS
1/2 fS
t(LRW) LRCK pulse duration HIGH, DSP format
t(BCY)
t(BCY)
LRCK pulse duration HIGH, TDM format
t(BCY)
1/fS â t(BCY)
t(LS) LRCK setup time to BCK rising edge
10
t(LH) LRCK hold time to BCK rising edge
10
t(DS) DATA1, DATA2, DATA3, DATA4 setup time to BCK rising edge
10
t(DH) DATA1, DATA2, DATA3, DATA4 hold time to BCK rising edge
10
(1) For right-justified, I2S, left-justified, and DSP formats, there is no fS (sampling frequency) limitation for all of 1/32 fS,
1/48 fS, or 1/64 fS. However, for TDM format, allowable fS is limited to fS ⤠50 kHz for BCK = 256 fS mode and fS â¤
100 kHz for BCK = 128 fS mode.
Figure 24. Audio Interface Timing
UNIT
ns
ns
ns
ns
ns
ns
ns
DE-EMPHASIS FILTER
The PCM1681 and PCM1681-Q1 include a digital de-emphasis filter for 32 kHz, 44.1 kHz, and 48 kHz sampling
frequencies.
18
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): PCM1681 PCM1681-Q1
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