ON LA1837M Single-chip am/fm tuner ic Datasheet

Ordering number : EN8271
LA1837M
Monolithic Linear IC
Single-Chip AM/FM Tuner IC
for Home Stereo Systems
http://onsemi.com
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
Maximum supply voltage
Allowable power dissipation
Symbol
Conditions
VCC max
Pd max
Ta≤70°C*
Ratings
Unit
12
V
550
mW
Operating temperature
Topr
-20 to +70
°C
Storage temperature
Tstg
-40 to +125
°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
Recommended supply voltage
VCC
Operating supply voltage range
VCC op
Conditions
Ratings
Unit
9
V
7.0 to 11.0
V
Electrical Characteristics at Ta = 25°C VCC = 9.0V, in the specified circuit.
Ratings
Parameter
Symbol
Conditions
Unit
min
typ
max
[FM Mono Characteristics] fc = 10.7MHz, fm = 1kHz, with the coil adjusted so that VAFC - VREG = 0V.
Current drain
Demodulator output
ICCO-FM
VOFM
No input
18
31
44
100dBµ, 100% mod, pin 16 output
730
1100
1460
mVrms
mA
-1.5
0
+1.5
dB
%
Channel balance
C.B-mono
100dBµ, 100% mod, pin 16 output / pin 17 output
Total harmonic
THDFM1
100dBµ, 100% mod, pin 16 output
0.3
1.3
distortion (mono)
THDFM2
100dBµ, 200% mod, pin 16 output
1.0
5.0
S/NFM
100dBµ, 100% mod, pin 16 output
72
80
dB
100dBµ, AM 30% mod, pin 16 output
45
65
dB
Referenced to 100dBµ, 100% mod, the input for output
26
32
38
dBμ
51
60
69
dBμ
100dBµ
85
120
170
kHz
100dBµ, pin 13 output
80
120
160
mVrms
0
0.1
0.5
V
100dBµ, pin 11 output
3.6
4.3
5.0
100dBµ, 100% mod, the pin 16 output
75
85
dB
dB
Signal-to-noise ratio
AM rejection ratio
Input limiting voltage
AMR
-3dBL.S
%
is -3dB down.
LED on sensitivity
LED on bandwidth
IF counter buffer output
S-meter output
SDON-FM
SDBW
VIFBUFF-FM
VSM FM1
VSM FM2
Muting attenuation
Mute Alt
0dBµ, pin 11 output
V
[FM Stereo Characteristics] fc = 10.7MHz, 100dBμ, fm = 1kHz, L+R = 90%, pilot = 10%
Separation: L
SepL
Lmod. pin 16 output / pin 17 output
30
45
Separation: R
SepR
Rmod. pin 17 output / pin 16 output
30
45
Stereo on level
STON
The pilot mod such that V7 < 0.7V
1.3
2.7
Stereo off level
STOFF
The pilot mod such that V7 > 4.5V
1.5
Total harmonic
THD main
L+R mod. Pin 16 output
0.3
fs = 113kHz, Vs = 90%, Pilot = 10%
40
dB
40
dB
dB
5.0
%
%
1.3
%
distortion (main)
Adjacent channel
Brej-3rd
interference rejection
ratio
Pin 16 output, versus L-R mod. 1kHz demodulator output
Brej-5th
fs = 189kHz, Vs = 90%, Pilot = 10%
Pin 16 output, versus L-R mod. 1kHz demodulator output
[AM Characteristics]
Current drain
ICCO-AM
15
25
35
mA
23dBµ, 30% mod, pin 16 output
100
180
360
mVrms
VOAM2
80dBµ, 30% mod, pin 16 output
200
320
500
mVrms
S/N AM1
23dBµ, 30% mod, pin 16 output
18
22
dB
S/N AM 2
80dBµ, 30% mod, pin 16 output
49
55
dB
Total harmonic
THD AM 1
80dBµ, 30% mod, pin 16 output
0.4
1.2
distortion
THD AM 2
80dBµ, 80% mod, pin 16 output
1.0
4.0
%
LED-ON sensitivity
SDOn-AM
17
27
37
dBμ
Output detector
VOAM1
Signal-to-noise ratio
No input
%
Oscillator buffer output
VOSC-AM
No input, pin 30 output
110
160
220
IF counter buffer output
VIFBuff-AM
80dBµ, non-mod, pin 13 output
160
220
300
mVrms
ST IF output
VSTIF-AM
80dBµ, non-mod, pin 7 output
16
34
48
mVrms
0
0
0.2
V
S-meter output
VSM-AM
0dBµ, non-mod
mVrms
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.
Pin
Pin
voltage
Equivalent circuit
Pin function
1
FM IF input
Vreg
Input impedance ri = 330 Ω
2
AM mixer output
VCC
Connect the mixer coil between this pin and VCC.
3
FM IF input
Vreg
bypass
4
AM IF input
Vreg
5
GND
0V
6
TU-LED,
7
ST-LED,
VCC
VCC
AM - IF output
See pin 1
Also used for the multiplex regulator filter
Input impedance ri = 2 kΩ
Active low
Open collector
AM stereo IF output (pin 7)
This pin must be set up with an influx current under 150µA.
8
9
VCC
FM detector
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.
Pin
10
AM narrow band
Pin
voltage
1.3V
Equivalent circuit
Pin function
Recommended narrow band ceramic filter
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
FM S-meter
0V
RL = 8kΩ
0V (AM)
The AM SD sensitivity can be adjusted with an external resistor
output
12
AM S-meter
output,
between this pin and ground.
AM SD
sensitivity
adjustment
13
AM/FM IF buffer
0V
V13 ≤ 0.5V: Reception state
output,
1.4V ≤ V13 ≤ 2.2V: IF buffer output on
Output control
V13 ≥ 3.5V: IF buffer output and muting on
switch (muting
switch)
14
15
VCC-1.4
(FM)
The IC switches to AM mode when this pin is connected to ground
comparator
Phase
low-pass filter
0V (AM)
Resistor value limits: 2.7kΩ (when VCC = 7V)
through a resistor.
(FM/AM
3.9kΩ (8V)
switching)
6.2kΩ (10V) 7.5kΩ (11V)
Pilot detector
VCC-1.0
5.1kΩ (9V)
When a current of over 50µA is sourced by this pin, the IC
low-pass filter
switches to forced monaural mode.
(Forced
The VCO is stopped if this pin is connected to ground.
monaural)
The resistor value limits are the same as for pin 14.
(VCO stop)
16
Post amplifier
Verg
Output impedance ro = 200Ω
17
I/O
Verg
Pin 16: right output, pin 17: left output
18
Inverting input pins
19
Pin 18: right input, pin 19: left input
RNF = 33kΩ
20
Multiplex output
21
3.5V
Output impedance ro = 3.3kΩ
3.5V
Pin 20: Right channel deemphasis
Pin 21: Left channel deemphasis
22
Multiplex input
2.9V
Input impedance ri = 20kΩ
23
FM
2.8V (FM)
Output impedance ro = 3.0kΩ
demodulated
2.8V (AM)
The separation can be adjusted with an external capacitor
output
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 No.
24
Pin
Pin
voltage
Equivalent circuit
Pin function
AM detector
0V (FM)
Output impedance ro = 3.3kΩ The AM frequency characteristics
output
0.5V (AM)
can be adjusted with an RC circuit connected between pin 22 and
ground.
25
AM AGC
0V (FM)
Internal load resistance R = 11kΩ
0.5V (AM)
26
AFC
Vreg
The FM SD bandwidth can be adjusted with an external resistor
connected between this pin and pin 28.
27
AM RF input
Vreg
This pin must be held at the same potential as pin 28
28
REG
Vreg
Vreg = 3.6V
29
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
output, FM SD
1.3V (AM)
connected between this pin and ground.
30
sensitivity
Output impedance ro = 20Ω
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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