LA1145M-TLM-E【PDF 5/17 页】IC FM IF SYSTEM CAR RADIO 20MFP

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LA1145 , 1145M

Sample Application Circuit

50 μ s

DC

emphasis

capacitor

Mute driver

output

S-meter

output

L1: 81N-014A (Sumida)

L2: 81N-014B (Sumida)

Unit (resistance: Ω , capacitance: F)

LS1140 and LS1145 Compared

Parameter

Package

IF amp, limiter

Quadrature detector

AF preamp

AFC output

Signal meter output

Band muting

IF count buffer output

SD circuit

S/N

3 dB μ limiting sensitivity

Weak signal noise output

LA1140

SIP-16

Direct-coupled

j

j

j

j

j

–

–

78 dB μ

25 dB μ (fixed)

j

LA1145

SIP-18Z

MFP-20

C-coupled

C

C

j

j

j

j

j

j

j

86 dB

25 to 40 dB μ

C

j

Remarks

Improved linearity, variable S-meter gradient

Improved temperature stability,

V BE dependent

Common with STRQ

For the LA1140, Coupled with the soft muting

function.

–3 dB μ limiting sensitivity variable,

independent of soft muting function

No. 2725-5/17

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