mt8880cpr1 Zarlink Semiconductor, mt8880cpr1 Datasheet - Page 11

• Manufacturer Part Number: mt8880cpr1
• Description: Integrated Dtmf Transceiver With Motorola Compatible Processor Interface
• Manufacturer: Zarlink Semiconductor

DTMF Clock Circuit
The internal clock circuit is completed with the addition of a standard television colour burst crystal. The crystal
specification is as follows:
Frequency:
Frequency Tolerance:
Resonance Mode:
Load Capacitance:
Maximum Series Resistance:
Maximum Drive Level:
e.g.
A number of MT8880C devices can be connected as shown in Figure 12 such that only one crystal is required.
Alternatively, the OSC1 inputs on all devices can be driven from a TTL buffer with the OSC2 outputs left
unconnected.
CTS Knights MP036S
Toyocom TQC-203-A-9S
Table 1 - Actual Frequencies Versus Standard Requirements
3.579545 MHz
±0.1%
Parallel
18 pF
150 ohms
2 mW
THD (%) = 100
ACTIVE
INPUT
L1
L2
L3
L4
H1
H2
H3
H4
Equation 2. THD (%) For a Dual Tone
SPECIFIED
Zarlink Semiconductor Inc.
OUTPUT FREQUENCY
1209
1336
1477
1633
697
770
852
941
MT8880C
V
2
2L
V
(Hz)
11
+ V
2
3H
2
+ .. V
V
3L
ACTUAL
2
1215.9
1331.7
1471.9
1645.0
699.1
766.2
847.4
948.0
L
+ .... V
+ V
2
nH
2
H
+ V
2
nL
2
+ V
IMD
2
2H
%ERROR
+0.30
+0.74
+0.57
+0.73
+
-0.49
-0.54
-0.32
-0.35
Data Sheet