CS61575-IP1 datasheet(38/44 Pages) CIRRUS

38 / 44 page

applications. A letter at the intersection of a row

and column in Table 2 indicates that the selected

transformer is supported for use with the device.

The transformer is installed in the evaluation

board with pin 1 positioned to match the letter

illustrated on the drawing in Table 2. For exam-

ple, the Pulse Engineering PE-65388 transformer

may be used with the transmitter of the CS61575

device for 100

Ω T1 applications only (as indi-

cated by note 3) when installed in transformer

socket T1 with pin 1 at position D (upper right).

PROTOTYPING AREA

A prototyping area with power supply and ground

connections is provided on the evaluation board.

This area can be used to develop and test a vari-

ety of additional circuits like a data pattern gener-

ator, CS2180B framer, system synchronizer PLL,

or specialized interface logic.

EVALUATION HINTS

1. Properly terminate TTIP/TRING when evaluat-

ing the transmit output signal. For more informa-

tion concerning pulse shape evaluation, refer to

the Crystal application note entitled "Measure-

ment and Evaluation of Pulse Shapes in T1/E1

Transmission Systems."

2. Change the receiver terminating resistors R9

and R10 when evaluating E1 applications. Resis-

tors R9 and R10 should be replaced with 240

Ω

resistors for terminating 120

Ω E1 twisted-pair

lines or 150

Ω resistors for terminating 75Ω E1

coaxial lines. Two 243

Ω resistors and two 150Ω

resistors are included with the evaluation board

for this purpose.

3. Closing a DIP switch on S2 towards the label

sets the device control pin of the same name to

logic 1 (+5 Volts).

4. To avoid damage to the external host controller

connected to JP1, all S2 switch positions (except

CLKE) should be open. In the Host operating

mode, the CLKE switch selects the active edge of

SCLK and RCLK.

LINE INTERFACE EVALUATION BOARD

DS40DB3

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