TDA7540N datasheet(73/76 Pages) STMICROELECTRONICS

부품명	TDA7540N

상세설명	AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system (ISS)

PDF	76 Pages

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제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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73 / 76 page

TDA7540N

Application notes

73/76

Application notes

Following items are important to get highest performance of TDA7540N in application:

In order to avoid leakage current from PLL loop filter input to ground a guardring is

recommended around loop filter PIN’s with PLL reference (VREF2) voltage potential.

Distance between Xtal and VCO input PIN 18 should be far as possible and Xtal

package should get a shield versus ground.

Blocking of VCO supply should be near at PIN 20 and PIN 21.

Blocking of VCC2 supply should be near at PIN 64 and PIN 61.

Wire lenght to FM mixer1-input and -output should be symetrically and short.

FM demodulator capacitance at PIN 56 should be sense connected as short as

possible versus demodulator ground at PIN 57.

Wire lenght from AM mixer tank output to 9KHz ceramic filter input has to be short as

possible.

To minimize “AM TWEET” the AM demodulator capacitor should be connected versus

GNDVCC1 at PIN 41 and FSU output at PIN 22 should be filtered with capacitor of

about 2,2nF versus GNDVCC2.

TDA7540N 데이터시트(PDF) 73 Page - STMicroelectronics