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TDA7513 데이터시트(PDF) 16 Page - STMicroelectronics

부품명 TDA7513
상세설명  SINGLE-CHIP FM/AM TUNER WITH STEREO DECODER AND AUDIO PROCESSOR
PDF  58 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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TDA7513 데이터시트(HTML) 16 Page - STMicroelectronics

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3.5 MULTIPATH AND QUALITY DETECTORS
4.0 FUNCTIONAL DESCRIPTION
4.1 FM Section
Mixer1, AGC and 1st IF
Mixer1 is a wide dynamic range stage with low noise and large input signal performance. The mixer1 tank
center frequency can be adjusted by software (IF1T). The AGC operates on different sensitivities and
bandwidths (FMAGC) in order to improve the input sensitivity and dynamic range (keyed AGC). The output
signals of AGC are controlled voltage and current for preamplifier and prestage P-I-N diode attenuator
(see Figure 5). Two 10.7MHz amplifiers (IFG1 - fixed gain - and IFG2 - programmable) correct the IF ce-
ramic insertion loss.
Mixer2, Limiter and Demodulator
In this 2nd mixer stage the first 10.7MHz IF is converted into the second 450kHz IF. A multi-stage limiter
generates signals for the complete integrated demodulator without external tank. MPX output DC offset
compensation is possible via software.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
fCMP
Center Frequency of Multipath-
Bandpass
Stereodecoder locked on Pilottone
19
kHz
GBPMP
Bandpass Gain
bits D2, D1 configuration byte = 00
6
dB
bits D2, D1 configuration byte = 10
12
dB
bits D2, D1 configuration byte = 01
16
dB
bits D2, D1 configuration byte = 11
18
dB
GRECTMP Rectifier Gain
bits D7, D6 configuration byte = 00
7.6
dB
bits D7, D6 configuration byte = 01
4.6
dB
bits D7, D6 configuration byte = 10
0
dB
bits D7, D6 configuration byte = 11
off
ICHMP
Rectifier Charge Current
bit D5 configuration byte = 0
0.5
µA
bit D5 configuration byte = 1
1
µA
IDISMP
Rectifier Discharge Current
0.5
1
1.5
mA
A
Multipath Influence Factor
Addr. 12 / Bit 5+6
00
0.7
dB
01
0.85
dB
10
1
dB
11
1.15
dB
B
Noise Influence Factor
Addr. 16 / Bit 1+2
00
15
dB
01
12
dB
10
9
dB
11
6
dB



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