ML7020 데이터 시트보기 (PDF) - Oki Electric Industry

부품명

상세내역

일치하는 목록

ML7020

1200 bps MODEM for Remote Control Systems

Oki Electric Industry 

1Semiconductor

FEDL7020-02

ML7020

tl

DTMF signal

tc

ts

tba

tbb

tp

tg

td

DTMF receive data

SP

tsp

Figure 3 DTMF reception timing

ts: Input signal persistence duration (detection)

Normal reception is made when the input signal persistence duration is equal to ts or more.

tI: Input signal persistence duration (non-detection)

The input signal is ignored when the input signal persistence duration is less than tI, and the SP and DTMF

receive data are not output.

tp: Signal quiet duration

The DTMF receive data and SP are reset if the input continues to be in the no-signal condition for a

duration equal to tp or longer.

Also, even if the receive data changes during DTMF signal reception, SP continues to be “1” and the

DTMF receive data may remain in the initial value and may not change, if the signal quiet duration is less

than tp (including when it changes without any instantaneous break).

tba: Instantaneous break protection period 1

This is applicable to the period after the input signal has arrived and until the timing when SP becomes “1”.

In other words, SP and DTMF receive data are output normally even if a no-signal condition of a duration

less than tba occurs.

tbb: Instantaneous break protection period 2

This is applicable when SP is “1” (during output of the receive data). In other words, SP and the DTMF

receive data are not reset even if a no-signal condition of a duration less than tbb occurs during signal

reception.

tc: For ensuring normal reception, make sure that the signal repetition period is equal to tc or more.

tg: Detection delay time

The DTMF receive data is output with a delay of tg relative to the appearance of the input signal.

td: Detection hold time

The output of SP or the DTMF receive data is stopped with a delay of td after the termination of the input

signal.

tsp: SP delay time

SP is output after a delay of tsp relative to the output of the DTMF receive data. Therefore, latch the

DTMF receive data when the rising edge of SP is detected.

10/19

Share Link: