PCM1721 datasheet(12/16 Pages) BURR-BROWN

12 / 16 page

PCM1721

SF1

SF0

Sampling Frequency

44.1kHz group

22.05/44.1/88.2kHz

48kHz group

24/48/96kHz

32kHz group

16/32/64kHz

Reserved

Not Defined

Bits 6 (SF0) and 7 (SF1) are used to select the sampling

frequency:

Bit 8 is used to control the infinite zero detection function

(IZD).

When IZD is “LOW”, the zero detect circuit is off. Under

this condition, no automatic muting will occur if the input

is continuously zero. When IZD is “HIGH”, the zero detect

feature is enabled. If the input data is continuously zero for

65, 536 cycles of BCKIN, the output will be immediately

forced to a bipolar zero state (V

CC/2). The zero detection

feature is used to avoid noise which may occur when the

input is DC. When the output is forced to bipolar zero,

there may be an audible click. PCM1721 allows the zero

detect feature to be disabled so the user can implement an

external muting circuit.

B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0

ML (pin 6)

MC (pin 7)

MD (pin 8)

FIGURE 7. Serial Interface Timing.

FIGURE 8. Program Register Input Timing.

1.4V

MC Pulse Cycle Time

MC Pulse Width LOW

MC Pulse Width HIGH

MD Set-up Time

MC Hold Time

ML Low Level Time

ML Set-up Time

ML Hold Time

: t

MCY

: t

MCL

: t

MCH

: t

MDS

: t

MDH

: t

MLL

: t

MLS

: t

MLH

: 100ns (min)

: 50ns (min)

: 30ns (min)

: 30ns + 1SYSCLK (min)

: 30ns (min)

MCY

MDS

MDH

MCH

MCL

MLS

MLH

MLL

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