CXA1700AQ Datasheet, PDF (40/51 Pages) Sony Corporation – Luminance and Color Signal Processing for 8mm VCR

6. Carrier/deviation adjustment
CXA1700AQ/AR
Dev IN
DEV CONT ₄₃
Dev
Cont
Sme IN
SMEAR
CONT
42
Smear
Cont
gm1=K1IXDEV
gm1
IXDEV
IXCAR
gm2=K2IXSME
gm2
IXSME
Carr
Cont
FM
Mod
LIM
CARR CONT
44
39 _YRFOUT
The Y FM modulation carrier frequency is adjusted by applying an external DC bias to CARR CONT (Pin
44). When carrier adjustment is performed, gm1 and gm2, the deviation/smear gain, change in proportion
to IXCAR at the same time. This results in the FM modulator sensitivity being roughly adjusted for the Dev
IN/Sme IN signal level. Fine adjustment of the deviation frequency is accomplished by the DC bias applied
to DEV CONT (Pin 43).
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