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TDA7705 Datasheet(PDF) 30 Page - STMicroelectronics

No. de pieza TDA7705
Descripción Electrónicos  Highly integrated tuner for AM/FM car radio
PDF  42 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7705 Datasheet(HTML) 30 Page - STMicroelectronics

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Front-end processing
TDA7705
30/42
Doc ID 15938 Rev 9
4
Front-end processing
All the parameters in this section refer to the programmability of the FE part of the device
(registers). The part of the registers that are not described here have either fixed values or
values written by the tuner drivers, and are described in the proper technical documentation.
Table 22.
Register 0x00
Register number
Register definition
MSB
LSB
23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
AM mixer input selector
0
1 input #1
1
0 input #2
AM PIN diode
0
internal
1
external
AM AGC mode
0
LNA and PIN diode
1
PIN diode only
AM AGC time constant
0
0
slow (125 ms with 1 µF)
0
1
medium (25 ms with 1 µF)
1
1
fast (5 ms with 1 µF)
AM AGC threshold @ mixin
0
0
0
90 dBµV
0
0
1
91 dBµV
0
1
0
92 dBµV
0
1
1
93 dBµV
1
0
0
90 dBµV
1
0
1
89 dBµV
1
1
0
88 dBµV
1
1
1
87 dBµV
AM AGC attack time constant
0
normal
1
fast



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