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MT88L70 Datasheet(PDF) 4 Page - Zarlink Semiconductor Inc

Part No. MT88L70
Description  3 Volt Integrated DTMF Receiver
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Maker  ZARLINK [Zarlink Semiconductor Inc]
Homepage  http://www.zarlink.com
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MT88L70 Datasheet(HTML) 4 Page - Zarlink Semiconductor Inc

 
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MT88L70
Data Sheet
4
Zarlink Semiconductor Inc.
the steering time constants externally, allows the designer to tailor performance to meet a wide variety of system
requirements.
Table 1 - Functional Decode Table
L=LOGIC LOW, H=LOGIC HIGH, Z=HIGH IMPEDANCE
X = DON‘T CARE
Guard Time Adjustment
In many situations not requiring selection of tone duration and interdigital pause, the simple steering circuit shown
in Figure 3 is applicable. Component values are chosen according to the formula:
tREC=tDP+tGTP
tID=tDA+tGTA
The value of tDP is a device parameter (see Figure 7) and tREC is the minimum signal duration to be recognized by
the receiver. A value for C of 0.1
µF is recommended for most applications, leaving R to be selected by the
designer.
Digit
TOE
INH
ESt
Q4
Q3
Q2
Q1
ANY
L
X
H
ZZZZ
1
H
X
H
0001
2
H
X
H
0010
3
H
X
H
0011
4
H
X
H
0100
5
H
X
H
0101
6
H
X
H
0110
7
H
X
H
0111
8
H
X
H
1000
9
H
X
H
1001
0
H
X
H
1010
*
H
X
H
1011
#
H
X
H
1100
A
H
L
H
1101
B
H
L
H
1110
C
H
L
H
1111
D
H
L
H
0000
AH
H
L
undetected, the output code
will remain the same as the
previous detected code
BH
H
L
CH
H
L
DH
H
L


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