MT8870DSR1 Zarlink, MT8870DSR1 Datasheet - Page 5

• Manufacturer Part Number: MT8870DSR1
• Description: DTMF RX 3.58MHz CMOS 5V 18-Pin SOIC T/R
• Manufacturer: Zarlink

Specifications of MT8870DSR1

• Package: 18SOIC
• Operating Frequency: 3.58 MHz
• Typical Supply Current: 3 mA
• Typical Operating Supply Voltage: 5 V
• Minimum Operating Supply Voltage: 4.75 V
• Maximum Operating Supply Voltage: 5.25 V

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 11) and t
L=LOGIC LOW, H=LOGIC HIGH, Z=HIGH IMPEDANCE
X = DON‘T CARE
ANY
Digit
C
D
C
D
1
2
3
4
5
6
7
8
9
0
#
A
B
A
B
*
V
St/GT
ESt
V
St/GT
ESt
DD
DD
TOE
Table 1 - Functional Decode Table
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
Figure 5 - Guard Time Adjustment
MT8870D/MT8870D-1
R
1
R
1
INH
C
Zarlink Semiconductor Inc.
H
H
H
H
X
X
X
X
X
X
X
X
X
X
X
X
X
L
L
L
L
C
1
R
1
R
2
2
t
ESt
GTP
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
t
GTP
a) decreasing t
b) decreasing t
=(R
t
5
GTA
t
=(R
GTA
undetected, the output code
will remain the same as the
previous detected code
P
R
REC
=(R
Q
C
1
Z
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
=(R
R
P
C
4
1
=(R
P
)In[V
1
1
=(R
)In[V
P
C
is the minimum signal duration to be recognized by
C
1
1
)In(V
R
1
1
DD
)In(V
Q
GTP
R
2
DD
GTA
Z
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
)/(R
3
2
/(V
)/(R
/(V
DD
; (t
; (t
DD
DD
1
DD
+R
/V
GTP
1
GTP
/V
-V
+R
Q
TSt
-V
Z
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
2
TSt
TSt
2
)
<t
2
>t
TSt
)
)
GTA
)
)]
GTA
)]
)
)
Q
Z
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Data Sheet