LA1837M-TLM-E [ONSEMI]
AM Stereo AM/FM+MPX for Electronic Tuners and Post Amplifier;
| 型号： | LA1837M-TLM-E |
| 厂家： | 
ONSEMI |
| 描述： | AM Stereo AM/FM+MPX for Electronic Tuners and Post Amplifier |
| 文件： | 总9页 (文件大小：460K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number : EN8271
LA1837M
Monolithic Linear IC
http://onsemi.com
Single-Chip AM/FM Tuner IC
for Home Stereo Systems
Overview
The LA1837M is a single-chip AM/FM tuner IC that provides AM and FM IF and multiplex decoding circuits for
electronic tuning and was developed for use in home stereo systems. It provides both SD and IF counting techniques for
optimal implementation of automatic station selection.
Features
• On-chip MPX VCO circuit (no external components required).
• Adjacent channel interference rejection function (third order and fifth order).
• Supports both the SD and IF counting technique (built-in SD speedup function).
• The AM and FM SD sensitivity can be set independently.
• The AM and FM output levels can be set independently.
• Improved basic FM reception performance.
Functions
• AM: RF amplifier, mixer, oscillator, IF amplifier, detector, AGC, oscillator buffer, S-meter, narrow band SD, IF
buffer
• FM IF: IF amplifier, quadrature detector, S-meter, SD, S curve detection, IF buffer output
• Multiplex stereo decoding: PLL stereo decoder, stereo indicator, forced monaural, VCO stop function, post amplifier,
audio muting, adjacent channel interference rejection function
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
V
Maximum supply voltage
Allowable power dissipation
Operating temperature
Storage temperature
V
max
12
CC
Pd max
Ta≤70°C*
550
-20 to +70
-40 to +125
mW
°C
Topr
Tstg
°C
*: Mounting board: 114.3×76.1×1.6mm glass epoxy board
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
Symbol
Conditions
Ratings
Unit
V
Recommended supply voltage
Operating supply voltage range
V
9
CC
V
op
7.0 to 11.0
V
CC
Electrical Characteristics at Ta = 25°C V
= 9.0V, in the specified circuit.
CC
Ratings
typ
Parameter
Symbol
Conditions
Unit
min
max
[FM Mono Characteristics] fc = 10.7MHz, fm = 1kHz, with the coil adjusted so that V
AFC
- V = 0V.
REG
Current drain
I
No input
18
31
1100
0
44
1460
+1.5
1.3
mA
mVrms
dB
CCO-FM
Demodulator output
Channel balance
V
100dBµ, 100% mod, pin 16 output
730
-1.5
OFM
C.B-mono
100dBµ, 100% mod, pin 16 output / pin 17 output
100dBµ, 100% mod, pin 16 output
Total harmonic
THD
THD
1
2
0.3
1.0
80
%
FM
distortion (mono)
100dBµ, 200% mod, pin 16 output
5.0
%
FM
Signal-to-noise ratio
AM rejection ratio
S/N
FM
100dBµ, 100% mod, pin 16 output
72
45
26
dB
AMR
-3dBL.S
100dBµ, AM 30% mod, pin 16 output
65
dB
Input limiting voltage
Referenced to 100dBµ, 100% mod, the input for output
is -3dB down.
32
38
dBμ
LED on sensitivity
LED on bandwidth
IF counter buffer output
S-meter output
SD
ON-FM
51
85
80
0
60
120
120
0.1
4.3
85
69
170
160
0.5
dBμ
kHz
mVrms
V
SD
100dBµ
BW
V
100dBµ, pin 13 output
0dBµ, pin 11 output
IFBUFF-FM
V
V
1
2
SM FM
SM FM
100dBµ, pin 11 output
100dBµ, 100% mod, the pin 16 output
3.6
75
5.0
V
Muting attenuation
Mute Alt
dB
[FM Stereo Characteristics] fc = 10.7MHz, 100dBμ, fm = 1kHz, L+R = 90%, pilot = 10%
Separation: L
Separation: R
Stereo on level
Stereo off level
SepL
SepR
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
45
45
dB
dB
%
ST
1.3
2.7
1.5
0.3
5.0
1.3
ON
ST
%
OFF
Total harmonic
distortion (main)
Adjacent channel
interference rejection
ratio
THD main
Brej-3rd
Brej-5th
%
fs = 113kHz, Vs = 90%, Pilot = 10%
40
40
dB
dB
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
[AM Characteristics]
Current drain
IC
No input
15
100
200
18
25
180
320
22
35
360
500
mA
mVrms
mVrms
dB
CO-AM
Output detector
V
V
1
2
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
OAM
OAM
Signal-to-noise ratio
S/N
S/N
1
AM
AM
AM
AM
2
49
55
dB
Total harmonic
distortion
THD
THD
1
0.4
1.0
27
1.2
4.0
37
%
2
%
LED-ON sensitivity
Oscillator buffer output
IF counter buffer output
ST IF output
SD
V
17
110
160
16
dBμ
On-AM
No input, pin 30 output
80dBµ, non-mod, pin 13 output
80dBµ, non-mod, pin 7 output
0dBµ, non-mod
160
220
34
220
300
48
mVrms
mVrms
mVrms
V
OSC-AM
V
IFBuff-AM
V
STIF-AM
S-meter output
V
0
0
0.2
SM-AM
No.8271-2/9
LA1837M
Package Dimensions
unit : mm
3073C
Block Diagram
No.8271-3/9
LA1837M
Coil Specifications
• AM oscillator (for the DUT)
• IFT
HW-50425 (Mitsumi Electric Co., Ltd.)
YD-1073-1 (Mitsumi Electric Co., Ltd.)
• FM-DET
600BEAS-9715Z (Toko Electric Corporation)
Pin Function
Pin
Pin No.
Pin
Equivalent circuit
Pin function
voltage
Vreg
1
FM IF input
Input impedance r = 330 Ω
i
2
AM mixer output
V
Connect the mixer coil between this pin and V
.
CC
CC
3
4
FM IF input
bypass
Vreg
Vreg
Also used for the multiplex regulator filter
See pin 1
AM IF input
Input impedance r = 2 kΩ
i
5
GND
0V
6
7
TU-LED,
V
Active low
CC
ST-LED,
V
Open collector
CC
AM - IF output
AM stereo IF output (pin 7)
This pin must be set up with an influx current under 150µA.
8
9
V
CC
FM detector
V
Recommended detector coil
CC
600BEAS-9715Z (The Toko Electric Corporation)
Continued on next page.
No.8271-4/9
LA1837M
Continued from preceding page.
Pin
Pin No.
10
Pin
Equivalent circuit
Pin function
voltage
AM narrow band 1.3V
ceramic filter
Recommended narrow band ceramic filter
BFU450C4N (Murata Mfg. Co., Ltd.)
connection
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
12
FM S-meter
output
0V
R = 8kΩ
L
AM S-meter
output,
0V (AM)
The AM SD sensitivity can be adjusted with an external resistor
between this pin and ground.
AM SD
sensitivity
adjustment
13
14
15
AM/FM IF buffer 0V
output,
V13 ≤ 0.5V: Reception state
1.4V ≤ V13 ≤ 2.2V: IF buffer output on
V13 ≥ 3.5V: IF buffer output and muting on
Output control
switch (muting
switch)
Phase
V
-1.4
The IC switches to AM mode when this pin is connected to ground
through a resistor.
CC
comparator
low-pass filter
(FM/AM
(FM)
0V (AM)
Resistor value limits: 2.7kΩ (when V
3.9kΩ (8V) 5.1kΩ (9V)
= 7V)
CC
switching)
6.2kΩ (10V) 7.5kΩ (11V)
Pilot detector
low-pass filter
(Forced
V
-1.0
When a current of over 50µA is sourced by this pin, the IC
switches to forced monaural mode.
CC
The VCO is stopped if this pin is connected to ground.
The resistor value limits are the same as for pin 14.
monaural)
(VCO stop)
16
17
18
19
Post amplifier
I/O
Verg
Verg
Output impedance r = 200Ω
o
Pin 16: right output, pin 17: left output
Inverting input pins
Pin 18: right input, pin 19: left input
R
F = 33kΩ
N
20
21
Multiplex output
Multiplex input
3.5V
3.5V
Output impedance r = 3.3kΩ
o
Pin 20: Right channel deemphasis
Pin 21: Left channel deemphasis
22
23
2.9V
Input impedance r = 20kΩ
i
FM
2.8V (FM)
2.8V (AM)
Output impedance r = 3.0kΩ
o
demodulated
output
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.
Continued on next page.
No.8271-5/9
LA1837M
Continued from preceding page.
Pin
voltage
Pin No.
24
Pin
Equivalent circuit
Pin function
AM detector
output
0V (FM)
0.5V (AM)
Output impedance r = 3.3kΩ The AM frequency characteristics
o
can be adjusted with an RC circuit connected between pin 22 and
ground.
25
26
AM AGC
0V (FM)
Internal load resistance R = 11kΩ
0.5V (AM)
AFC
Vreg
The FM SD bandwidth can be adjusted with an external resistor
connected between this pin and pin 28.
27
28
AM RF input
REG
Vreg
Vreg
This pin must be held at the same potential as pin 28
Vreg = 3.6V
29
30
OSC
Vreg
Connect the oscillator coil between this pin and pin 28.
Oscillator buffer 1.6V (FM)
The FM SD sensitivity can be adjusted with an external resistor
connected between this pin and ground.
output, FM SD
sensitivity
1.3V (AM)
Output impedance r = 20Ω
o
adjustment
No.8271-6/9
LA1837M
No.8271-7/9
LA1837M
No.8271-8/9
LA1837M
Test Circuit
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PS No.8271-9/9
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