CMX469A 参数 Datasheet PDF下载

1200/2400/4800 Baud FFSK/MSK Modem

CMX469A

1.4

External Components

Component

R1

C1

C2

C3

C4

C5

C6

C7

X1

Value

1.0M

Ω

33.0pF

1.0µF

0.1µF

0.1µF

1.0µF

1.0µF

33.0pF

1.008MHz

or

4.032MHz

Notes:

1. V

BIAS

may be decoupled to V

SS

and V

DD

using C2 and C6 when input signals are referenced to the V

BIAS

pin. For input signals referenced to V

SS

, decouple V

BIAS

to V

SS

using C2 only.

2. The performance of the Carrier Detect function will be affected by the nature of the noise spectrum in the

received channel. The value of C4 determines the Carrier Detect Time Constant. A long time constant

results in improved noise immunity but increased response time. C4 may be varied to trade-off response

time for noise immunity.

3. A 4.032MHz Xtal/clock is required for 4800 Baud operation.

Figure 2 Recommended External Components

©

2001 Consumer Microcircuits Limited

7

D/469A/2