®

PCM1720

10

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. PCM1720 allows the zero

detect feature to be disabled so the user can implement

external muting circuit.

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

FIGURE 5. Serial Interface Timing.

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

ML (pin 4)

MC (pin 5)

MD (pin 6)

FIGURE 6. Program Register Input Timing.

1.4V

1.4V

1.4V

ML

MC

MD

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)

: 50ns (min)

: 30ns (min)

: 30ns (min)

: 30ns + 1SYSCLK (min)

: 30ns (min)

: 30ns (min)

t

MCY

t

MDS

t

MDH

t

MCH

t

MCL

t

MLS

t

MLH

t

MLL

Not Recommended For New Designs