CMX635 Просмотр технического описания (PDF) - CML Microsystems Plc

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CMX635

ISDN Subscriber Processor

CML Microsystems Plc 

ISDN Subscriber Processor

1.4.1 Component Values

XT1

12.288MHz or 15.36MHz

T1

Line Transformer, 2:1 Turns Ratio i.e. ETAL P3024 – Note 1.

R1, R3

R2, R4

R5

R6

R7

R8, R9

R10, R11

Note 2.

110kΩ

1%

15 kΩ

2%

Note 3.

39kΩ

1%

10kΩ

5%

750R (5V supply),

5%

470R (3.3V supply) 5%

C1, C3, C5

C2, C4

C6

C7

C8, C9

C10, C12

C11, C13

1.0µF

220pF

150pF

27nF

33pF

1.0µF

10nF

5%

5%

5%

5%

20%

10%

10% - Note 4.

CMX635

Notes:

1. If a suitable transformer module is not used, protection components should be added around

the line transformers, including 33R series resistors in the STTX lines and 10kΩ series

resistors in the STRX lines.

2. R1, R2, C1 and C2 form the gain components of input amplifier RX1. R3, R4, C3 and C4 form

the gain components of input amplifier RX2. R1 and R3 should be chosen as required by the

input signal level according to the following formula:

Gain = -R2/R1 or -R4/R3

C1, R1 and C3, R3 should be chosen so as not to compromise the low frequency

performance.

3. R6, R7, C6 and C7 form the gain components of output amplifier TX1. R6 should be chosen

to give the required output signal level according to the following formula:

Gain = -R7/R6

4. Ensure that high frequency filter capacitors are placed physically close to appropriate power

pins.

© 2001 Consumer Microcircuits Limited

11

D/635/2

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