參數(shù)資料
型號: TDA8295HN/C2
廠商: NXP SEMICONDUCTORS
元件分類: 接收器
英文描述: AM/FM, AUDIO/VIDEO DEMODULATOR, PQCC40
封裝: 6 X 6 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT618-1, HVQFN-40
文件頁數(shù): 28/83頁
文件大?。?/td> 3440K
代理商: TDA8295HN/C2
TDA8295_C2_2
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 — 27 November 2009
34 of 83
NXP Semiconductors
TDA8295
Digital global standard low IF demodulator for analog TV and FM radio
9.3.9 Tuner IF AGC functions
Table 29.
T_IF_AGC_SET register (address 15h) bit description
Legend: * = default value.
Bit
Symbol
Access Value
Description
7
POL_TIF
R/W
tuner IF AGC polarity
0
inverted tuner IF AGC polarity
1*
normal tuner IF AGC polarity: the higher
the necessary gain, the higher the IF
AGC voltage
6 to 0 T_IF_AGC_SPEED[6:0] R/W
T_IF_AGC_SPEED determines the tuner
IF AGC loop speed
000 0001
18 dB nominal
000 0010
12 dB nominal
000 0100
6 dB nominal
000 1000*
nominal speed (determined by the tuner
IF control slope)
001 0000
+6 dB nominal
010 0000
+12 dB nominal
100 0000
+18 dB nominal
Table 30.
T_IF_AGC_LIM register (address 16h) bit description
Legend: * = default value.
Bit
Symbol
Access Value
Description
7 to 4 UP_LIM[3:0]
R/W
The tuner IF AGC output voltage can be limited to
interface with concepts having power supply < 3.3 V.
UP_LIM determines the upper limit from 1
2 FS (= 0h) to
FS (= Fh). The format is straight binary.
1111*
set upper limit to maximum
3 to 0 LOW_LIM[3:0]
R/W
LOW_LIM determines the lower tuner IF AGC output
limit from 0 (= 0h) to 1
2 FS (= Fh). The format is straight
binary.
0000*
set lower limit to minimum
Table 31.
T_IF_AGC_FORCE register (address 17h) bit description
Legend: * = default value.
Bit
Symbol
Access Value
Description
7
T_FORCE
R/W
the tuner IF AGC output voltage can be forced
externally to a fixed voltage, determined by
T_FORCE_VAL
0*
tuner IF AGC normal operation
1
tuner IF AGC output voltage determined by
T_FORCE_VAL
6 to 0 T_FORCE_VAL[6:0]
R/W
T_FORCE_VAL determines the tuner IF AGC
forced value. So the tuner IF AGC can be fixed to
a certain value for debugging purposes. Format is
straight binary.
3Fh*
0.5
× V
DD(3V3), i.e. 1.65 V nominally
XXh
don’t care if T_FORCE = 0
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