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System Clock

SCKI

0.8 V

SCKI

2 V

T0005A07

PCM1802

SLES023C – DECEMBER 2001 – REVISED JANUARY 2005

PRINCIPLES OF OPERATION (continued)

frequency. The system clock must be supplied on SCKI (pin 15).

The PCM1802 has a system clock detection circuit which automatically senses if the system clock is operating at

delta-sigma modulator and the digital filter.

Table 1 shows the relationship of typical sampling frequencies and system clock frequencies, and Figure 22

shows system clock timing.

Table 1. Sampling Frequency and System Clock Frequency

SAMPLING RATE

SYSTEM CLOCK FREQUENCY (MHz)

FREQUENCY

(kHz)

32

8.192

12.288

16.384

24.576

44.1

11.2896

16.9344

22.5792

33.8688

48

12.288

18.432

24.576

36.864

64

16.384

24.576

32.768

49.152

88.2

22.5792

33.8688

45.1584

—

96

24.576

36.864

49.152

—

PARAMETER

MIN

MAX

UNIT

System clock-pulse duration, high

7

ns

System clock-pulse duration, low

7

ns

Figure 22. System Clock Timing

13