XR-T5683A Datasheet, PDF (9/12 Pages) Exar Corporation – PCM Line Interface Chip

XR-T5683A
INPUT AND OUTPUT TRANSFORMERS
Pulse Engineering types PE-65415, PE-65771 or
PE-65835 transformers, may be used for both the input
and output transformers. These three parts, which are all
1CT:2CT turns ratio and have similar electrical
specifications, are wound on small, epoxy-encapsulated,
torroid cores. They differ in physical size, operating
temperature range and voltage isolation. These
transformers are suitable for operation over the 1.544
through 8.448Mbps range which includes T1, T2, E1 and
E2.
Schott-Part
Number
24443
24444
Nominal
Inductance
48µHy with CT
5µHy with CT
Mechanical Style
RM 5 Core,
4 Pin Bobbin
14 x 8 Potcore,
6 Pin Bobbin
Bit Rate
(MBIT/S)
1.544(T1)
2.048(E1)
6.312(T2)
6.448(E2)
Tuning Cap.
(See Note)
200pF
100pF
100pF
60pF
Table 2. Inductor Selection
Notes
- Capacitor values shown combined with typical stray capacitance will normally resonate the tank circuit at the specific bit rate.
- The center-tapped inductor (L) eliminates clock amplifier overload by reducing the signal amplitude applied to T5683A pin 4. While
feeding pseudo-random data into the receive input, tune this inductor for minimum jitter on the recovered clock (pin 8) as viewed on
an oscilloscope.
- R, which may be in the 20K to 50kΩ range, is optional and may be used to lower clock recovery circuit Q if desired.
Magnetic Supplier Information:
Pulse
Telecom Product Group
P.O. Box 12235
San Diego, CA 92112
Tel. [phone]
Fax. [phone]
John Marshall
Schott Corporation
1838 Elm Hill Pike, Suite 100
Nashville, TN 37210
Tel. [phone]
Fax [phone]
Rev. 2.01
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