參數(shù)資料
型號(hào)： TUA4307
廠商： INFINEON TECHNOLOGIES AG
元件分類： 接收器
英文描述： AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP80
封裝： MQFP-80
文件頁(yè)數(shù)： 17/48頁(yè)
文件大?。?/td> 952K
代理商： TUA4307
Functional Description
3 - 16
TUA 4307
Wireless Components
Specification, September 1999
Voltage Controlled Oscillator, Phase Detector:
The 912kHz oscillator and the frequency dividers are used as walsh function
generators (suppression of 3rd order harmonics) for:
38 kHz for the stereo decoder
19 kHz inphase for phase detector and pilot cancellation
19 kHz quadrature for the phase detector.
The phase detector locks the on chip 19 kHz signal to the pilot tone in the MPX
signal at 90 deg phase.
Pilot Detector, Pilot Indicator, Pilot Cancellation:
The voltage at the pilot detector output is proportional to the pilot tone input
level. If that level is high enough, the pilot indicator output is activated and the
pilot cancellation turned on: a 19 kHz signal proportional to the voltage at the
pilot detector output is added to the MPX signal with inverse polarity, cancelling
the 19 kHz pilot tone.
Interference Detector , Noise Detector, Pulse Former:
The signal from the interference input (MPX or field strength signal) passes a 4-
pole high-pass filter to the noise blanking circuitry. The average noise level is
stored in an external capacitor. The interference detector compares the actual
noise level with that stored on the capacitor and triggers the pulse former if there
is a significant difference. The pulse former generates a gate pulse for the HCC
block. During that pulse time the outputs of the deemphasis circuit are switched
to hold mode.
3.3.4
AM - MODE
In the AM mode the 1st IF is converted by the 2nd mixer into the 2nd IF in the
450 kHz range. Therefore a 2nd LO crystal oscillator, which can be also used
as force input is part of the IC. The 2nd IF signal passes an automatic gain con-
trolled IF amplifier and is then demodulated to the AF in a quasisynchronous
demodulator. Switching to seek mode, the AGC time constant is reduced by a
factor of 5, the AM IF counter output is switched on and the AF is muted. The
AGC voltage is used as AM field strength and is fed to the combined field
strength output. The fieldstrength voltage is also used for an station detector
with adjustable threshold. The output is combined with the FM station detector.
An output for an AM stereodecoder (CQAM) is also available (450 kHz AGC
amp output).
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