Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Semiconductor Components Industries, LLC, 2013
May, 2013
92706 / O3105 MS OT B8-3807 No.8271-1/9
LA1837M
Operating Conditions
at Ta = 25°C
Parameter
Recommended supply voltage
Operating supply voltage range
Symbol
VCC
VCC op
Conditions
Ratings
9
7.0 to 11.0
Unit
V
V
Electrical Characteristics
at Ta = 25°C VCC = 9.0V, in the specified circuit.
Ratings
Parameter
Symbol
Conditions
min
[FM Mono Characteristics] fc = 10.7MHz, fm = 1kHz, with the coil adjusted so that VAFC - VREG = 0V.
Current drain
Demodulator output
Channel balance
Total harmonic
distortion (mono)
Signal-to-noise ratio
AM rejection ratio
Input limiting voltage
LED on sensitivity
LED on bandwidth
IF counter buffer output
S-meter output
ICCO-FM
VOFM
C.B-mono
THDFM1
THDFM2
S/NFM
AMR
-3dBL.S
SDON-FM
SDBW
VIFBUFF-FM
VSM FM1
VSM FM2
Muting attenuation
Mute Alt
100dBµ
100dBµ, pin 13 output
0dBµ, pin 11 output
100dBµ, pin 11 output
100dBµ, 100% mod, the pin 16 output
No input
100dBµ, 100% mod, pin 16 output
100dBµ, 100% mod, pin 16 output / pin 17 output
100dBµ, 100% mod, pin 16 output
100dBµ, 200% mod, pin 16 output
100dBµ, 100% mod, pin 16 output
100dBµ, AM 30% mod, pin 16 output
Referenced to 100dBµ, 100% mod, the input for output
is -3dB down.
51
85
80
0
3.6
75
60
120
120
0.1
4.3
85
69
170
160
0.5
5.0
dBμ
kHz
mVrms
V
V
dB
72
45
26
18
730
-1.5
31
1100
0
0.3
1.0
80
65
32
38
44
1460
+1.5
1.3
5.0
mA
mVrms
dB
%
%
dB
dB
dBμ
typ
max
Unit
[FM Stereo Characteristics] fc = 10.7MHz, 100dBμ, fm = 1kHz, L+R = 90%, pilot = 10%
Separation: L
Separation: R
Stereo on level
Stereo off level
Total harmonic
distortion (main)
Adjacent channel
interference rejection
ratio
[AM Characteristics]
Current drain
Output detector
ICCO-AM
VOAM1
VOAM2
Signal-to-noise ratio
S/N AM1
S/N AM 2
Total harmonic
distortion
LED-ON sensitivity
Oscillator buffer output
IF counter buffer output
ST IF output
S-meter output
THD AM 1
THD AM 2
SDOn-AM
VOSC-AM
VIFBuff-AM
VSTIF-AM
VSM-AM
No input, pin 30 output
80dBµ, non-mod, pin 13 output
80dBµ, non-mod, pin 7 output
0dBµ, non-mod
No input
23dBµ, 30% mod, pin 16 output
80dBµ, 30% mod, pin 16 output
23dBµ, 30% mod, pin 16 output
80dBµ, 30% mod, pin 16 output
80dBµ, 30% mod, pin 16 output
80dBµ, 80% mod, pin 16 output
17
110
160
16
0
15
100
200
18
49
25
180
320
22
55
0.4
1.0
27
160
220
34
0
1.2
4.0
37
220
300
48
0.2
35
360
500
mA
mVrms
mVrms
dB
dB
%
%
dBμ
mVrms
mVrms
mVrms
V
Brej-5th
Brej-3rd
fs = 113kHz, Vs = 90%, Pilot = 10%
Pin 16 output, versus L-R mod. 1kHz demodulator output
fs = 189kHz, Vs = 90%, Pilot = 10%
Pin 16 output, versus L-R mod. 1kHz demodulator output
40
dB
40
dB
SepL
SepR
STON
STOFF
THD main
Lmod. pin 16 output / pin 17 output
Rmod. pin 17 output / pin 16 output
The pilot mod such that V7 < 0.7V
The pilot mod such that V7 > 4.5V
L+R mod. Pin 16 output
30
30
1.3
45
45
2.7
1.5
0.3
1.3
5.0
dB
dB
%
%
%
No.8271-2/9
LA1837M
Package Dimensions
unit : mm
3073C
Block Diagram
No.8271-3/9
LA1837M
Coil Specifications
• AM oscillator (for the DUT)
HW-50425 (Mitsumi Electric Co., Ltd.)
• IFT
YD-1073-1 (Mitsumi Electric Co., Ltd.)
• FM-DET
600BEAS-9715Z (Toko Electric Corporation)
Pin Function
Pin No.
1
Pin
FM IF input
Pin
voltage
Vreg
Equivalent circuit
Input impedance ri = 330
Ω
Pin function
2
AM mixer output
VCC
Connect the mixer coil between this pin and VCC.
3
4
FM IF input
bypass
AM IF input
Vreg
Vreg
See pin 1
Also used for the multiplex regulator filter
Input impedance ri = 2 kΩ
5
6
7
GND
TU-LED,
ST-LED,
AM - IF output
0V
VCC
VCC
Active low
Open collector
AM stereo IF output (pin 7)
This pin must be set up with an influx current under 150µA.
8
9
FM detector
VCC
VCC
Recommended detector coil
600BEAS-9715Z (The Toko Electric Corporation)
Continued on next page.
No.8271-4/9
LA1837M
Continued from preceding page.
Pin No.
10
Pin
AM narrow band
ceramic filter
connection
Pin
voltage
1.3V
Equivalent circuit
Pin function
Recommended narrow band ceramic filter
BFU450C4N (Murata Mfg. Co., Ltd.)
When the narrow band SD function is not used, bypass this circuit
by connecting a 50Ω resistor and a 0.047µF capacitor in series.
11
FM S-meter
output
0V
RL = 8kΩ
12
AM S-meter
output,
AM SD
sensitivity
adjustment
0V (AM)
The AM SD sensitivity can be adjusted with an external resistor
between this pin and ground.
13
AM/FM IF buffer
output,
Output control
switch (muting
switch)
0V
V13
≤
0.5V: Reception state
1.4V
≤
V13
≤
2.2V: IF buffer output on
V13
≥
3.5V: IF buffer output and muting on
14
Phase
comparator
low-pass filter
(FM/AM
switching)
VCC-1.4
(FM)
0V (AM)
The IC switches to AM mode when this pin is connected to ground
through a resistor.
Resistor value limits: 2.7kΩ (when VCC = 7V)
3.9kΩ (8V)
5.1kΩ (9V)
6.2kΩ (10V) 7.5kΩ (11V)
15
Pilot detector
low-pass filter
(Forced
monaural)
(VCO stop)
VCC-1.0
When a current of over 50µA is sourced by this pin, the IC
switches to forced monaural mode.
The VCO is stopped if this pin is connected to ground.
The resistor value limits are the same as for pin 14.
16
17
18
19
Post amplifier
I/O
Verg
Verg
Output impedance ro = 200Ω
Pin 16: right output, pin 17: left output
Inverting input pins
Pin 18: right input, pin 19: left input
RNF = 33kΩ
20
21
Multiplex output
3.5V
3.5V
Output impedance ro = 3.3kΩ
Pin 20: Right channel deemphasis
Pin 21: Left channel deemphasis
22
Multiplex input
2.9V
Input impedance ri = 20kΩ
23
FM
demodulated
output
2.8V (FM)
2.8V (AM)
Output impedance ro = 3.0kΩ
The separation can be adjusted with an external capacitor
connected between this pin and ground.
The VOsub/VOmain ratio is set to be approximately 0dB.
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