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ST7580 Datasheet(PDF) 15 Page - STMicroelectronics

No. de pieza ST7580
Descripción Electrónicos  FSK, PSK multi-mode power line networking system-on-chip
PDF  33 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7580 Datasheet(HTML) 15 Page - STMicroelectronics

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ST7580
Analog front end (AFE)
Doc ID 022644 Rev 1
15/33
5
Analog front end (AFE)
5.1
Reception path
Figure 6 shows the block diagram of the ST7580 input receiving path. The main blocks are a
wide input range analog programmable gain amplifier (PGA) and the analog to digital
converter (ADC).
Figure 6.
Reception path block diagram
The PGA is controlled by an embedded loop algorithm, adapting the PGA gain to amplify or
attenuate the input signal according to the input voltage range for the ADC.
The PGA gain ranges from -18 dB up to 30 dB, with steps of 6 dB (typ.), as described in
Table 6.
Table 6.
PGA gain table
PGA code
PGA gain (typ.) [dB]
RX_IN max. range [V p-p]
0
-18
V(RX_IN) MAX
1-12
8
2-6
4
302
461
5
12
0.500
6
18
0.250
7
24
0.125
8
30
0.0625
AM02505v1
RX AFE
BPF
ADC
RX_IN
BPF
BPF
ADC
ADC
PGA
PGA



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