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PCM4104IPFBREP датащи(PDF) 16 Page - Texas Instruments

номер детали PCM4104IPFBREP
подробное описание детали  High-Performance, 24-Bit, 216-kHz Sampling, Four-Channel Audio Digital-to-Analog Converter
PDF  43 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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PCM4104IPFBREP датащи(HTML) 16 Page - Texas Instruments

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SYSTEM CLOCK REQUIREMENTS
SCKI
t
SCKI
t
SCKIH
t
SCKIL
PARAMETER
DESCRIPTION
MIN
MAX
UNITS
System Clock Period
26
ns
t SCKIH
System Clock High Pulse Time
12
ns
tSCKIL
System Clock Low Pulse Time
12
ns
t SCKI
PCM4104-EP
SBAS419 – JUNE 2007
PRODUCT OVERVIEW (continued)
The PCM4104 requires a system clock, applied at the SCKI (pin 14) input. The system clock operates at an
integer multiple of the input sampling frequency, or fS. The multiples supported include 128fS, 192fS, 256fS,
384fS, 512fS, or 768fS. The system clock frequency is dependent upon the sampling mode. Table 1 shows the
required system clock frequencies for common audio sampling frequencies. Figure 4 shows the system clock
timing requirements.
Although the architecture of the PCM4104 is tolerant to phase jitter on the system clock, it is recommended that
the user provide a low jitter clock (100 picoseconds or less) for optimal performance.
Table 1. Sampling Modes and System Clock Frequencies for Common Audio Sampling Rates
SAMPLING
SYSTEM CLOCK FREQUENCY (MHz)
SAMPLING
FREQUENCY,
＝fS
MODE
128fS
192fS
256fS
384fS
512fS
768fS
(kHz)
Single Rate
32
n/a
n/a
8.192
12.288
16.384
24.576
Single Rate
44.1
n/a
n/a
11.2896
16.9344
22.5792
33.8688
Single Rate
48
n/a
n/a
12.288
18.432
24.576
36.864
Dual Rate
88.2
n/a
n/a
22.5792
33.8688
n/a
n/a
Dual Rate
96
n/a
n/a
24.576
36.864
n/a
n/a
Quad Rate
176.4
22.5792
33.8688
n/a
n/a
n/a
n/a
Quad Rate
192
24.576
36.864
n/a
n/a
n/a
n/a
Figure 4. System Clock Timing Requirements
16
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