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參數資料
| 型號： | LA1845N |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PDIP24 |
| 封裝： | 0.300 INCH, DIP-24 |
| 文件頁數： | 2/4頁 |
| 文件大小： | 119K |
| 代理商： | LA1845N |
LA1845N
No.7185-2/9
Operating Conditions at Ta = 25
°C
Parameter
Symbol
Conditions
Ratings
Unit
Recommended supply voltage
VCC
8V
Operating supply voltage range
VCC op
Ta = 80
°C
4.3 to 8.5
V
Electrical Characteristics at Ta = 25°C, VCC = 8V, in the specified test circuit.
Ratings
Parameter
Symbol
Conditions
min
typ
max
Unit
FM mono characteristics fc = 10.7MHz, Vi = 100dB
μ, fm = 1kHz, Modulation = 75kHz
Current drain
ICCO-FM
With no input signal
20
30
40
mA
Demodulator output
VOFM
100dB
μ, 100% modulation, fm = 1kHz
230
360
460
mVrms
Total harmonic distortion
THDFM
100dB
μ, 100% modulation, fm = 1kHz
0.35
1.5
%
Signal-to-noise ratio
S/NFM
100dB
μ, 100% modulation, fm = 1kHz
73
80
dB
AM rejection ratio
AMR
100dB
μ, AM 30% modulation, fm = 1kHz
47
65
dB
3dB sensitivity
100dB
μ, 100% modulation,
fm = 1kHz Output reference, -3dB input
32
40
dB
μ
SD sensitivity
0% modulation
38
47
56
dB
μ
IF counter buffer output
VIFBuff-FM
100dB
μ
200
275
400
mVrms
Mute attenuation
Mute-Att
100dB
μ, 100% modulation, fm = 1kHz
76
dB
FM stereo characteristics fc = 10.7MHz, Vi = 100dB
μ, fm = 1kHz, L + R = 90%, pilot = 10%
Separation
SepL
L + R = 90%, Pilot = 10%, fm = 1kHz
30
42
dB
Stereo on level
STON
Pilot input
1.5
3.5
5.5
%
Total harmonic distortion
THD-main
Pilot input
0.45
1.5
%
Brej-3rd
fs = 113kHz, Vs = 90%, Pilot = 10% :
The left - right modulation, demodulated output
36
dB
Adjacent channel rejection ratio
Brej-5th
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 fc = 1000kHz, Vi = 80dB
μ, fm = 1kHz, Modulation = 30%
Current drain
ICCO-AM
With no input signal
13
27
39
mA
VOAM1
23dB
μ, 30% modulation, fm = 1kHz
40
80
160
mVrms
Detector output
VOAM2
80dB
μ, 30% modulation, fm = 1kHz
90
160
230
mVrms
S/NAM1
23dB
μ, 30% modulation, fm = 1kHz
17
23
dB
Signal-to-noise ratio
S/NAM2
80dB
μ, 30% modulation, fm = 1kHz
46
52
dB
THDAM1
80dB
μ, 30% modulation, fm = 1kHz
0.4
1.1
%
Total harmonic distortion
THDAM2
107dB
μ, 30% modulation, fm = 1kHz
0.5
1.3
%
SD sensitivity
0% modulation
11
20
29
dB
μ
Local oscillator buffer output
VOSC-AM
With no input signal
100
140
200
mVrms
IF counter buffer output
VIFBuff-AM
23dB
μ
140
285
400
mVrms
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