CMX589A 查看數據表（PDF） - CML Microsystems Plc

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CMX589A

GMSK Modem

CML Microsystems Plc 

GMSK Modem

CMX589A

2 Signal List

Pin No.

E2/D5/

D2/P4

Signal

1

XTALN

2

XTAL/CLOCK

3

ClkDivA

4

ClkDivB

5

RxHOLDN

6

RxDCacq

7

PLLacq

8

Rx PSAVE

9

VBIAS

10 Rx FB

11 Rx Signal In

12

VSS

13 DOC1

14 DOC2

15 BT

Type

Description

O/P The output of the on-chip clock oscillator.

I/P The input to the on-chip Xtal oscillator. A Xtal, or externally derived clock

(fXTAL) pulse input should be connected here. If an externally generated

clock is to be used, it should be connected to this pin and the XTALN pin

left unconnected. Note: Operation without a suitable Xtal or clock input

may cause device damage.

I/P Logic level inputs control the internal clock divider and therefore the

transmit and receive data rate. See Table 4.

I/P Logic level inputs control the internal clock divider and therefore the

transmit and receive data rate. See Table 4.

I/P A logic ‘0’ applied to this input will freeze the Clock Extraction and Level

Measurement circuits unless they are in ‘Acquire’ mode.

I/P A logic ‘1’ applied to this input will set the Rx Level Measurement circuitry

to the ‘Acquire’ mode. See Table 6.

I/P A logic ‘1’ applied to this input will set the Rx Clock Extraction circuitry to

the ‘Acquire’ mode. See Table 5.

I/P A logic ‘1’ applied to this input will powersave all receive circuits except

for Rx CLK output (which will continue at the set bit-rate) and cause the

Rx Data and Rx S/N outputs to go to a logic ‘0’.

The internal circuitry bias line, held at VDD/2. This pin must be bypassed

to VSS by a capacitor mounted close to the pin.

O/P Output of the Rx Input Amplifier.

I/P Input to Rx input amplifier.

power Negative supply (GND).

Connections to the Rx Level Measurement Circuitry. A capacitor should

be connected from this pin to VSS.

Connections to the Rx Level Measurement Circuitry. A capacitor should

be connected from this pin to VSS.

A logic level to select the modem BT (the ratio of the Tx Filter's -3dB

frequency to the Bit-Rate). A logic ‘1’ = BT of 0.5 and a logic ‘0’ = BT of

0.3.

© 1998 Consumer Microcircuits Limited

4

D/589A/3

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