SM9503A

NIPPON PRECISION CIRCUITS INC.—8

Decoder Circuit

The detector output and peak/bottom hold mid-level potential reference are used to decode the time code sig-

nal, which is output on pin OUT. The output is active-LOW, so that the output is LOW when the input ampli-

tude is HIGH.

Standby Function

When PON is open (or HIGH), the device is in standby mode and the current consumption is reduced. Receiver

operation starts when PON goes LOW.

PON

Mode

OUT

Open (or HIGH)

Standby

HIGH

LOW

Operating

Time code

Peak hold

Bottom hold

Mid-level potential

Decoder

OUT output

Rectifier

LPF

Peak/

Bottom

Hold

LPF waveform