ST7538Q datasheet(15/44 Pages) STMICROELECTRONICS

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ST7538Q

Functional description

15/44

Functional description

5.1

Carrier frequencies

ST7538Q is a multi frequency device: eight programmable Carrier Frequencies are available

(see Table 5).

Only one Carrier could be used a time. The communication channel could be varied during

the normal working Mode to realize a multifrequency communication.

Selecting the desired frequency in the Control Register the Transmission and Reception

filters are accordingly tuned.

5.2

Baud rates

ST7538Q is a multi Baud rate device: four Baud Rate are available (See Table 6.).

Table 5. ST7538Q Channels List

FCarrier

F (KHz)

82.05

110

F7(1)

132.5

Table 6. ST7538Q mark and space tones frequency distance vs baud rate and deviation

Baud Rate [Baud]

∆F (1) (Hz)

Frequency deviation.

Deviation (2)

Deviation =

∆F / (Baud Rate)

600

1 (3)

Deviation 0.5 Not Allowed

1200

600

1200

0.5

2400 (4)

Default value

1200 (4)

2400

0.5

4800

2400

4800

0.5

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