mt88l89asr1 Zarlink Semiconductor, mt88l89asr1 Datasheet - Page 11

• Manufacturer Part Number: mt88l89asr1
• Description: 3 V Integrated Dtmf Transceiver With Adaptive Micro Interface
• Manufacturer: Zarlink Semiconductor

The Fourier components of the tone output correspond to V
harmonic distortion for a dual tone can be calculated by using Equation 2. V
amplitude and high group amplitude, respectively and V
internal switched-capacitor filter following the D/A converter keeps distortion products down to a very low level as
shown in Figure 9.
DTMF Clock Circuit
The internal clock circuit is completed with the additions of a standard television color burst crystal. The crystal
specification is as follows:
Frequency:
Frequency Tolerance:
Resonance Mode:
Load Capacitance:
Maximum Series Resistance:
Maximum Drive Level:
A number of MT88L89 devices can be connected as shown in Figure 11 such that only one crystal is required.
Alternatively, the OSC1 inputs on all devices can be driven from a CMOS buffer with the OSC2 outputs left
unconnected.
e.g.CTS Knights MP036S
Toyocom TQC-203-A-9S
THD (%) = 100
OSC1 OSC2
3.579545 MHz
MT88L89
3.579545 MHz
±0.1%
Parallel
18 pF
150 ohms
2 mW
Figure 11 - Common Crystal Connection
Equation 2. THD (%) For a Dual Tone
Zarlink Semiconductor Inc.
MT88L89
OSC1 OSC2
V
MT88L89
2
2L
V
11
2
+
2
IMD
3H
V
2
V
2f
+ ..
3L
2
.... V
is the sum of all the intermodulation components. The
L
+ ....
V
+
2
V
nH
nf
2
V
H
+
as measured on the output waveform. The total
2
nL
V
OSC1 OSC2
2
+
IMD
V
MT88L89
2
2H
+
L
and V
H
correspond to the low group
Data Sheet