LM3189 datasheet(3/8 Pages) NSC

Part #	LM3189

Description	LM3189 FM IF System

PDF	8 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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3 / 8 page

Test Circuits

Test Circuit for LM3189N Using a Single-Tuned Detector Coil

All resistance values are in X

L tunes with 100 pF (C) at 107 MHz

Qo(unloaded) j 75 (Toko No KACS K586HM

or equivalent)

C e001 mF for 50 ms de-emphasis (Europe)

0015 mF for 75 ms de-emphasis (USA)

TLH7960 – 3

Test Circuit for LM3189N Using a Double-Tuned Detector Coil

All resistance values are in X

TPRIQo(unloaded

75 (tunes with 100 pF

(C12)) 20t of 34e on 732 dia form

SECQo(unloaded) j 75 (tunes with 100 pF

(C2)) 20t of 34e on 732 dia form

kQ(percent of critical coupling) j 70%

(adjusted for coil voltage (VC) e 150 mV

Above values permit proper operation of mute

(squelch) circuit ‘‘E’’ type slugs spacing 4 mm

C e001 mF for 50 ms de-emphasis (Europe)

0015 mF for 75 ms de-emphasis (USA)

TLH7960 – 4

LM3189 Datasheet(PDF) 3 Page - National Semiconductor (TI)