¡ Semiconductor
ML7005
Timing When DTMF is received
tBRKDT1
tCYCDT
tDETDT
tBRKDT2
tREJDT
tPOSDT
AIN Signal
tDELDT
tHOLDT
DTMF Receive Data
tSP
SP
Figure 3 Timing When DTMF is Received
t
t
t
: Time to Detect
When Time to Detect is the specified value of t
normally received.
: Time to Reject
DETDT
REJDT
POSDT
or more, the DTMF signal is
DETDT
When Time to Reject is the specified value of t
or less, the input signal is ignored
REJDT
and the SP and DTMF receive data are not output.
: Interdigit Pause
When there is no input signal for the period of t
or more, the DTMF receive data
POSDT
and SP are reset. Even if the receive data is changed, when Interdigit Pause Time is the
value of t
or less (including the change without Drop Out), SP remains at "0" and
POSDT
the DTMF receive data may maintain its initial value.
: Acceptable Drop Out Time 1
t
t
BRKDT1
AcceptableDropOutTime1isappliedbetweenwhentheinputsignalcomesandwhen
SP becomes "0". Even if there is no input signal for the period of t
and DTMF receive data are normally output.
: Acceptable Drop Out Time 2
or less, the SP
BRKDT1
BRKDT2
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 t
SP and DTMF receive data are not reset.
or less,
BRKDT2
t
t
: Signal Repetition Time
CYCDT
DELDT
HOLDT
Signal Repetition Time should be the specified value of t
or more so that a signal
CYCDT
is normally received.
: Detect Delay Time
The DTMF receive data is output with a delay of the specified value of t
after the
DELDT
input signal appears.
t
t
: Detect Hold Time The SP and DTMF receive data outputs stop with a delay of the
specified value of t
SP Delay Time
after the input signal disappears.
HOLDT
:
SP
The SP data is output with a delay of the specified value of t after the DTMF receive
SP
data is output. The DTMF receive data should be latched after detecting the fall of SP.
12/24
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