ML7005MB datasheet(12/25 Pages) OKI

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¡ Semiconductor

ML7005

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Timing When DTMF is received

DTMF Receive Data

AIN Signal

tCYCDT

tDETDT

tPOSDT

tREJDT

tBRKDT1

tDELDT

tSP

tHOLDT

tBRKDT2

Figure 3 Timing When DTMF is Received

tDETDT : Time to Detect

When Time to Detect is the specified value of tDETDT or more, the DTMF signal is

normally received.

tREJDT : Time to Reject

When Time to Reject is the specified value of tREJDT or less, the input signal is ignored

and the SP and DTMF receive data are not output.

tPOSDT : Interdigit Pause

When there is no input signal for the period of tPOSDT or more, the DTMF receive data

and SP are reset. Even if the receive data is changed, when Interdigit Pause Time is the

value of tPOSDT or less (including the change without Drop Out), SP remains at "0" and

the DTMF receive data may maintain its initial value.

tBRKDT1 : Acceptable Drop Out Time 1

Acceptable Drop Out Time 1 is applied between when the input signal comes and when

SP becomes "0". Even if there is no input signal for the period of tBRKDT1 or less, the SP

and DTMF receive data are normally output.

tBRKDT2 : Acceptable Drop Out Time 2

Acceptable Drop Out Time 2 is applied when SP is "0" (when receive data is output).

Even if there is no input signal during signal reception for the period of tBRKDT2 or less,

SP and DTMF receive data are not reset.

tCYCDT : Signal Repetition Time

Signal Repetition Time should be the specified value of tCYCDT or more so that a signal

is normally received.

tDELDT : Detect Delay Time

The DTMF receive data is output with a delay of the specified value of tDELDT after the

input signal appears.

tHOLDT : Detect Hold Time The SP and DTMF receive data outputs stop with a delay of the

specified value of tHOLDT after the input signal disappears.

tSP :

SP Delay Time

The SP data is output with a delay of the specified value of tSP after the DTMF receive

data is output. The DTMF receive data should be latched after detecting the fall of SP.

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