XR-T5683A

9

Rev. 2.01

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

Nominal

Inductance

Mechanical Style

Bit Rate

(MBIT/S)

Tuning Cap.

(See Note)

24443

48

µHy with CT

RM 5 Core,

4 Pin Bobbin

1.544(T1)

200pF

4 Pin Bobbin

2.048(E1)

100pF

24444

5

µHy with CT

14 x 8 Potcore,

6 Pin Bobbin

6.312(T2)

100pF

6 Pin Bobbin

6.448(E2)

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 50k

Ω 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. (619) 674-8100

Fax. (619) 674-8262

John Marshall

Schott Corporation

1838 Elm Hill Pike, Suite 100

Nashville, TN 37210

Tel. (615) 889-8800

Fax (615) 885-0834