MT88L70 Ver la hoja de datos (PDF) - Zarlink Semiconductor Inc
Número de pieza
componentes Descripción
Fabricante
MT88L70 Datasheet PDF : 16 Pages
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MT88L70
Data Sheet
the steering time constants externally, allows the designer to tailor performance to meet a wide variety of system
requirements.
Digit
ANY
1
2
3
4
5
6
7
8
9
0
*
#
A
B
C
D
A
B
C
D
TOE INH ESt Q4
Q3
Q2
Q1
L
X
H
Z
Z
Z
Z
H
X
H
0
0
0
1
H
X
H
0
0
1
0
H
X
H
0
0
1
1
H
X
H
0
1
0
0
H
X
H
0
1
0
1
H
X
H
0
1
1
0
H
X
H
0
1
1
1
H
X
H
1
0
0
0
H
X
H
1
0
0
1
H
X
H
1
0
1
0
H
X
H
1
0
1
1
H
X
H
1
1
0
0
H
L
H
1
1
0
1
H
L
H
1
1
1
0
H
L
H
1
1
1
1
H
L
H
0
0
0
0
H
H
L
H
H
L undetected, the output code
will remain the same as the
H
H
L previous detected code
H
H
L
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.
4
Zarlink Semiconductor Inc.
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