LA1867NM Datasheet, PDF (17/32 Pages) Sanyo Semicon Device – Car Radio Single-Chip Tuner System

Continued from preceding page.
Pin
Function
12 MRC output pin
MRC Block Applications
Pin
Function
15 MRC AC input pin
LA1867NM
Unit (resistance:Ω, capacitance:F)
Equivalent internal circuit
Note
Equivalent internal circuit
Note
In methods in which the S-meter AC
components are detected directly, the noise
amplifier gain is determined by R₂ and the
30 kΩ internal resistance, as shown in
Figure 1. A certain degree of filtering
characteristics can be provided with
capacitor C₁.
In methods in which the S-meter high area
components are detected, or the NC HDF
noise output is detected, the noise amplifier
gain is determined by R₂ and 30 kΩ as
shown in Ffigure 2. Here, the frequency
characteristics are determined by C₁.
MRC control voltage time
34 _constant
MRC control voltage time
34 _constant
Time constant setting pin
16 _constant
During discharge, the MRC detector time
constant is determined by R_S (1 kΩ) and
C_A. During charge, it is determined by I_C
and C_A.
Attack time = C_A × R_S
(Stereo → mono)
Recovery time = C_A × R_A
(Mono → stereo)
No. 4619-17/32