MT9075BP1 Zarlink, MT9075BP1 Datasheet - Page 11

• Manufacturer Part Number: MT9075BP1
• Description: PB FREE E1 SINGLE CHIP TRANSCEIVER
• Manufacturer: Zarlink

Transformer Recommendation
Table 1 shows a list of recommended transformers for the MT9075B line interface.
Timing Source
The MT9075B can use either a clock or crystal, connecting to pins OSC1 and OSC2, as the reference timing
source.
Figure 6 shows a 20 MHz clock oscillator, with 50 ppm tolerance, directly connected to the OSC1 pin of the
MT9075B.
Alternatively, a crystal oscillator may be used. A complete oscillator circuit made up of a crystal, resistors and
capacitors is shown in Figure 7. The crystal specification is as follows.
Frequency:
Tolerance:
Oscillation Mode:
Resonance Mode:
Load Capacitance:
Maximum Series Resistance:
Approximate Drive Level:
MT9075B
Table 1 - Transformer Manufacturers and Part Numbers
Pulse Engineering
Manufacturer
OSC1
OSC2
Midcom
OSEC
Filtran
20 MHz
50 ppm
Fundamental
Parallel
32 pF
35 Ω
1 mW
Figure 6 - Clock Oscillator Circuit
(
open
Zarlink Semiconductor Inc.
20MHz
OUT
)
MT9075B
+
5V
GND
Vdd
11
PE-65351
02934/A
5721-1
For Tx
50027
.1µF
PE-64934
02935/A
For Rx
5721-2
50026
Data Sheet