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ST7580 Fiches technique(PDF) 15 Page - STMicroelectronics

No de pièce ST7580
Description  FSK, PSK multi-mode power line networking system-on-chip
PDF  33 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7580 Fiches technique(HTML) 15 Page - STMicroelectronics

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ST7580
Analog front-end (AFE)
33
5
Analog front-end (AFE)
5.1
Reception path
Figure 5 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 5. 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 7.
Table 7. 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
30
2
46
1
5
12
0.500
6
18
0.250
7
24
0.125
830
0.0625
AM02505v1
RX AFE
BPF
ADC
RX_IN
BPF
BPF
ADC
ADC
PGA
PGA



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