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CXA1538 View Datasheet(PDF) - Sony Semiconductor

Part Name
Description
Manufacturer
CXA1538
Sony
Sony Semiconductor Sony
CXA1538 Datasheet PDF : 15 Pages
First Prev 11 12 13 14 15
CXA1538M/N/S
2. MPX circuit
1) MPX load resistance
When power supply voltage is over 3 V, change the MPX load resistor R6, R7 from 3.3 kto 6.8 k.
In this case, the output level is increased by about 6 dB.
2) Time constant of de-emphasis
Refer to the following table as the time constant is determined at C13, C14, R6 and R7.
50 µs
75 µs
3.3 k
0.015 µF
0.022 µF
6.8 k
0.0082 µF
0.012 µF
R6, R7
C13, C14
3. AFC circuit
1) This IC has a built-in variable capacitances.
Change to the following circuit when designing J band, because the standard circuit is for W band.
3pF
23 22
9 10
150k
4.7µ
2) AFC pull-in range is expanded by increasing the capacitance of standard circuit C7 3 pF.
Adjust the value of capacitance according to the set specification.
4. Auto blend circuit
This IC has a built-in auto blend circuit and a MONO switch is not required as a rule. This circuit controls
the separation in proportion to the signal level and reduces noise automatically for stereo reception below
the mid electric field when the electric field strength reaches lower than about 40 dBµ. When the electric
field strength turns below 10 to 15 dBµ, MONO operation is automatically activated.
To switch MONO mode on externally, ground pin 3 with 33 k.
2
3
33k
MONO
SW
—11—
 

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