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PCM3002 Datasheet(PDF) 22 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
Part # PCM3002
Description  16/20-BIT SINGLE-ENDED ANALOG INPUT/OUTPUT STEREO AUDIO CODECS
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Manufacturer  BURR-BROWN [Burr-Brown (TI)]
Direct Link  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

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BCKIN
LRCIN
DIN
t(BCH)
t(BCL)
t(LRP)
t(LB)
t(BCY)
0.5 VDD
t(BL)
DOUT
t(BDO)
t(LDO)
0.5 VDD
t(DIS)
t(DIH)
0.5 VDD
0.5 VDD
T0021−01
SYSTEM CLOCK
PCM3002
PCM3003
SBAS079A – OCTOBER 2000 – REVISED OCTOBER 2004
BCKIN pulse cycle time
t(BCY)
300 ns (min)
BCKIN pulse duration, HIGH
t(BCH)
120 ns (min)
BCKIN pulse duration, LOW
t(BCL)
120 ns (min)
BCKIN rising edge to LRCIN edge
t(BL)
40 ns (min)
LRCIN edge to BCKIN rising edge
t(LB)
40 ns (min)
LRCIN pulse duration
t(LRP)
t(BCY) (min)
DIN setup time
t(DIS)
40 ns (min)
DIN hold time
t(DIH)
40 ns (min)
DOUT delay time to BCKIN falling edge
t(BDO)
40 ns (max)
DOUT delay time to LRCIN edge
t(LDO)
40 ns (max)
Rising time of all signals
t(RISE)
20 ns (max)
Falling time of all signals
t(FALL)
20 ns (max)
Figure 43. Audio Data Input/Output Timing
The system clock for the PCM3002/3003 must be either 256 fS, 384 fS, or 512 fS, where fS is the audio sampling
frequency. The system clock should be provided at the SYSCLK input (pin 9).
The PCM3002/3003 also has a system-clock detection circuit that automatically senses if the system clock is
operating at 256 fS, 384 fS, or 512 fS. When a 384-fS or 512-fS system clock is used, the clock is divided to 256 fS
automatically. The 256-fS clock is used to operate the digital filters and the delta-sigma modulators.
Table 1 lists the relationship of typical sampling frequencies and system clock frequencies; Figure 44 illustrates
the system clock timing.
Table 1. System Clock Frequencies
SAMPLING RATE FREQUENCY (kHz)
SYSTEM CLOCK FREQUENCY (MHz)
256 fs
384 fs
512 fs
32
8.1920
12.2880
16.3840
44.1
11.2896
16.9344
22.5792
48
12.2880
18.4320
24.5760
22


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