
LA1845NV 
No.7931-2/10
Electrical Characteristics 
 Operating Characteristics 
at VCC = 8V, in the specified test circuit.
FM Mono Characteristics 
at fc = 10.7MHz, Vi = 100dB
μ
, fm = 1kHz, Modulation = 75kHz
Ratings 
Parameter 
Conditions 
min 
typ 
max 
Unit 
Current Drain 
With no input signal 
20
30 
40
mA 
Demodulator Output 
100dB
μ
, 100% modulation, fm = 1kHz 
230
360 
460
mVrms
Total Harmonic Distortion 
100dB
μ
, 100% modulation, fm = 1kHz 
0.35 
1.5
% 
Signal-to-Noise Ratio 
100dB
μ
, 100% modulation, fm = 1kHz 
73
80 
dB 
AM Rejection Ratio 
100dB
μ
, AM = 30% modulation, fm = 1kHz 
100dB
μ
, 100% modulation, fm = 1kHz Output reference,  
-3dB input 
47
65 
dB 
3dB Sensitivity 
32 
40
dB
μ
SD Sensitivity 
0% modulation 
38
47 
56
dB
μ
IF Counter Buffer Output 
100dB
μ
200
275 
400
mVrms
Mute Attenuation 
100dB
μ
, 100% modulation, fm = 1kHz 
76 
dB 
FM Stereo Characteristics 
at fc = 10.7MHz, Vi = 100dB
μ
, L+R = 90%, Pilot = 10%, fm = 1kHz
Ratings 
Parameter 
Conditions 
min 
typ 
max 
Unit 
Separation 
L+R = 90%, Pilot = 10%, fm = 1kHz 
30
42 
dB 
Stereo On Level 
Pilot input 
1.5
3.5 
5.5
% 
Total Harmonic Distortion 
Pilot input 
0.45 
1.5
% 
Adjacent Channel Rejection Ratio 1 
fs = 113kHz, VS = 90%, Pilot = 10% ; 
The left-right modulation, demodulated output 
36 
dB 
Adjacent Channel Rejection Ratio 2 
fs = 189kHz, VS = 90%, Pilot = 10% ; 
The left-right modulation, demodulated output 
41 
dB 
Carrier Leak 
L+R = 90%, Pilot = 10% reference, Pilot = 10% output
38
44 
dB 
AM Characteristics 
at fc = 1000kHz, Vi = 80dB
μ
, fm = 1kHz, Modulation = 30%
Ratings 
Parameter 
Conditions 
min 
typ 
max 
Unit 
Current Drain 
With no input signal 
13
27 
39
mA 
Detector Output 1 
23dB
μ
, 30% modulation, fm = 1kHz 
40
80 
160
mVrms
Detector Output 2 
80dB
μ
, 30% modulation, fm = 1kHz 
90
160 
230
mVrms
Signal-to-Noise Ratio 1 
23dB
μ
, 30% modulation, fm = 1kHz 
17
23 
dB 
Signal-to-Noise Ratio 2 
80dB
μ
, 30% modulation, fm = 1kHz 
46
52 
dB 
Total Harmonic Distortion 1 
80dB
μ
, 30% modulation, fm = 1kHz 
0.4 
1.1
% 
Total Harmonic Distortion 2 
107dB
μ
, 30% modulation, fm = 1kHz 
0.5 
1.3
% 
SD Sensitivity 
0% modulation 
11
20 
29
dB
μ
Local Oscillator Buffer Output 
With no input signal 
100
140 
200
mVrms
IF Counter Buffer Output 
23dB
μ
140
285 
400
mVrms