CDB61584A datasheet(5/12 Pages) CIRRUS

5 / 12 page

DS261DB2

CDB61584A

Dual Line Interface Unit

EVALUATION HINTS

1) The orientation of pin 1 for the CS61584A is la-

beled "1" on the left side of the socket U7.

2) A jumper must not be placed on header J10

when using the CDB61584A.

3) Component locations R3-R4, R14-R15, C1,

and C12 must have the correct values installed

according to the application. All the necessary

components are included with the evaluation

board.

4) Closing a DIP switch on SW2, SW3, and SW4

towards the label sets the CS61584A control

pin of the same name to logic 1.

5) When performing a manual loopback of the re-

covered signal to the transmit signal at the BNC

connectors, the recovered data must be valid on

the falling edge of RCLK to properly latch the

data in the transmit direction. To accomplish

this, the SW2 switch position labeled "CLKE"

must be closed (logic 1) during Hardware mode

operation or the CLKE bit in the Control A reg-

ister must be set to a 1 during Host mode oper-

ation.

6) Jumpers can be placed on headers J9 and J12 to

provide a ground reference on TRING for 75

Ω

coax E1 applications.

Properly terminate TTIP/TRING when evalu-

ating the transmit output pulse shape. For more

information concerning pulse shape evaluation,

refer to the Crystal application note entitled

"Measurement and Evaluation of Pulse Shapes

in T1/E1 Transmission Systems."

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