ST7536CFN datasheet(4/9 Pages) STMICROELECTRONICS

tên linh kiện	ST7536CFN

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FUNCTIONAL DESCRIPTION

1 - Transmit Section

The transmit mode is set when Rx/Tx = 0, if Rx/Tx

is held at 0 longer than 3s, thenthe device switches

automatically in the Rx mode. A new activation of

the Tx mode requires Rx/Tx to be returned to 1 for

a minimum 2

µs period before being set to 0.

The Transmit Data (TxD) is sampled on a positive

edge of CLR/T which delivers the transmit bit clock

when the transmit mode is selected. This data

enters a FSK modulator whose two basic frequen-

cies are selected by the Baud Rate Selection pin

(BRS) and the Channel Selection pin (CHS) ac-

cording to the Table 1.

CLR/T

TxD

DATA VALID

Figure 1 : Tx Data Input Timing

Table 1

BRS

CHS

Baud Rate

(Baud)

Tx Frequencies (kHz)

TxD=1 - TxD=0

0

600

81.75 - 82.35

0

1

600

67.2 - 67.8

1

0

1200

71.4 - 72.6

1

1200

85.95 - 87.15

These frequencies are synthesized from a

11.0592MHzcrystal oscillator ; theirprecision is the

same as the crystal one’s (100 ppm).

The modulatedsignal coming out of the FSK modu-

lator is filtered by a switched-capacitor band-pass

filter (Tx band-pass) in order to limit the output

spectrum and to reduce the level of harmonic com-

ponents.

The output stage of the Tx path consists of an

Automatic Level Control (ALC) system which keeps

the output signal (ATO) amplitude independant of

the lineimpedancevariations. ThisALC is a variable

gain system (with 32 discrete values) controlled by

an analog feed-back signal ALCI (see Figure 2).

The ALC gain range is 0dB to -26dB and gain

change is clocked at 7200Hz. Gain steps are of

magnitude 0.84dB typically.

A period of this clock is decomposed into a 34.7

µs

gain settling latency and a 104.2

µs peak detecting

time. The gain change is related to the result of a

peak detection obtained by making a direct com-

parison of ALCI maximum value (during detecting

time) with two threshold voltages VT1 and VT2 (see

Figure 2).

- max (VALCI) < VT1 - The next gain is increased

by 0.84dB,

-VT1

≤ max (VALCI) ≤ VT2 - No gain change,

-VT2 < max (VALCI) - The next gain is decreased

by 0.84dB.

Amplitude

modification

due to an

external cause

High Gain

Low Gain

Correct Gain

Correct

Gain

VT2

VT1

ALCI SIGNAL ENVELOP

ALC CLOCK

Figure 2 : Automatic Level Control Timing Chart

ST7536

4/9

Số phần tương tự - ST7536CFN

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