MT88L70AN1 Zarlink, MT88L70AN1 Datasheet - Page 4

• Manufacturer Part Number: MT88L70AN1
• Description: DTMF RX 3.58MHz CMOS 3V 20-Pin SSOP Tube
• Manufacturer: Zarlink

Specifications of MT88L70AN1

• Package: 20SSOP
• Operating Frequency: 3.58 MHz
• Typical Supply Current: 2 mA
• Typical Operating Supply Voltage: 3 V
• Minimum Operating Supply Voltage: 2.7 V
• Maximum Operating Supply Voltage: 3.6 V

the steering time constants externally, allows the designer to tailor performance to meet a wide variety of system
requirements.
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:
The value of t
the receiver. A value for C of 0.1 µF is recommended for most applications, leaving R to be selected by the
designer.
DP
is a device parameter (see Figure 7) and t
Digit
ANY
A
B
C
D
A
B
C
D
1
2
3
4
5
6
7
8
9
0
#
*
Table 1 - Functional Decode Table
TOE
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
Zarlink Semiconductor Inc.
INH
H
H
H
H
X
X
X
X
X
X
X
X
X
X
X
X
X
L
L
L
L
MT88L70
t
REC
t
ID
ESt
=t
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
=t
DA
4
DP
+t
+t
REC
undetected, the output code
will remain the same as the
previous detected code
GTA
Q
Z
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
GTP
4
is the minimum signal duration to be recognized by
Q
Z
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
3
Q
Z
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
2
Q
Z
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Data Sheet