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LA7583 Datenblatt(PDF) 8 Page - Sanyo Semicon Device

Teilenummer LA7583
Bauteilbeschribung  IF Signal Processing Circuit (A2C PLL VIF SIF) for TVs and VCRs
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Hersteller  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LA7583 Datenblatt(HTML) 8 Page - Sanyo Semicon Device

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Continued from preceding page.
Pin
No.
Symbol
Circuit Configuration
Description
4
IF AGC
Pin 4 is the 1st IFAGC filter pin. This filter
smoothes out the peaks detected in the
signal by the AGC detector, and generates
the AGC voltage. The 2nd AGC filter (lag
lead filter) is built in using filter technology.
The cutoff frequency is approximately
500 Hz.
.
AGC filter constants and AGC speed
Medium-speed AGC: R1 = 330 k
Ω
C1 = 0.1 µF
High-speed AGC:
R1 = 470 k
Ω
C1 = 0.056 µF
5
6
VIF INPUT
Pins 5 and 6 are the VIF amplifier input
pins. The VIF amplifier has three stages,
each of which uses a C cut, so when used
in conjunction with a SAW filter, DC cut by a
capacitor becomes unnecessary.
Ri = 1.1 k
Ω
Ci=3pF
9
1st SIF INPUT
Pin 9 is the 1st SIF input pin. Input is such
that DC cut must be performed using a
capacitor. When a SAW filter, etc. is used in
the input circuit, an L that is used to
neutralize the SAW filter output capacitance
and the IC input capacitance serves to
improve the 1st SIF sensitivity.
Continued on next page.
LA7583
No.5177-8/15


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