FX489 Просмотр технического описания (PDF) - CML Microsystems Plc

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Компоненты Описание

производитель

FX489

GMSK Modem

CML Microsystems Plc 

Pin Number

Function

FX489DW

FX489P

13

Doc1:

Connections to the Rx Level Measurement Circuitry. A capacitor should be connected from

each pin to VSS.

14

Doc2:

15

BT: A logic level to select the modem ‘BT’ (the ratio of the Tx Filter's -3dB frequency to the Bit-

Rate). A logic “1” sets the modem to a BT of 0.5, a logic “0” to a BT of 0.3.

16

Tx Out: The Tx signal output from the FX489 GMSK Modem.

17

Tx Enable: A logic “1” applied to this input enables the transmit data path through the Tx Filter to

the “Tx Out pin”. A logic “0” will put the “Tx Out” pin to VBIAS via a high impedance.

18

Tx PS: A logic “1” applied to this input will powersave all transmit circuits except for the Tx Clock.

19

Tx Data: The logic level input for the data to be transmitted. This data should be synchronous

with the “Tx Clock”.

20

Rx Data: A logic level output carrying the received data, synchronous with the “Rx Clock”.

21

Rx Clock: A logic level clock output at the received data bit-rate.

22

Tx Clock: A logic level clock output at the transmit-data rate.

23

Rx S/N: A logic level output which may be used as an indication of the quality of the received

signal.

24

VDD: Positive supply rail. A single +5 volt power supply is required. Levels and voltages within this

modem are dependent upon this supply. This pin should be decoupled to VSS by a capacitor

mounted close to the pin.

3

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