AMIS-30585 查看數據表（PDF） - ON Semiconductor

零件编号

产品描述 (功能)

生产厂家

AMIS-30585

S-FSK PLC Modem

ON Semiconductor 

AMIS-30585

7.20 Pin 25: TX_ENB

TX_ENB is a digital output pin. It is high when the transmitter is activated. The signal is available to turn on the line driver. TX_ENB is a

5V safe with open drain output, hence a pull-up resistance is necessary achieve the requested voltage level associated with a logical

one. See also Figure 4 for reference.

7.21 Pin 26: TX_OUT

TX_OUT is the analog output pin of the transmitter. The provided signal is the S-FSK modulated frames. A filtering operation must be

performed to reduce the second order harmonic distortion. For this purpose an active filter is realized. Figure 7 gives the representation

of this filter.

Figure 7: TX_OUT Filter

7.22 Pin 27: ALC_IN

ALC_IN is the automatic level control analog input pin. The signal is used to adjust the level of the transmitted signal. The signal level

adaptation is based on the AC component. The DC level on the ALC_IN pin is fixed internally to 1.65V. Comparing the peak voltage of

the AC signal with two internal thresholds does the adaptation of the gain. Low threshold is fixed to 0.4V. A value under this threshold

will result in an increase of the gain. The high threshold is fixed to 0.6V. A value over this threshold will result in a decrease of the gain.

The pin must be decoupled from the sensed signal by a 1mF capacitor. An application example is given on Figure 8. A serial

capacitance is used to filter the DC components. The level adaptation is performed during the transmission of the first two bits of a new

frame. Eight successive adaptations are performed.

Figure 8: Connection to the Line Driver

Rev. 2 | Page 10 of 23 | www.onsemi.com

Share Link: