AM Tuners for Car Radios and Home Stereos
Overview
The LA1136N/NM and LA1137N/NM are high-performance
AM electronic tuner ICs offering sophisticated functions. They
are especially suited for use in car radio and home stereo
(antenna: loop) applications.
Functions
.
MIX
.
OSC (with ALC)
.
IF amplifier
.
Detector
.
AGC (normal)
.
RF wide-band AGC
.
Auto search stop signal (Signal meter output)
.
Local oscillation buffer output
.
IF band switching circuit (for LA1136N only)
.
IF count buffer
.
Stop detector output (can be set independently)
.
Tweet prevention circuit
.
AGC (RF, IF) time constant switching circuit
.
IF AGC circuit
.
Pin-diode driver
.
AM stereo decoder IF output (for LA1136N only)
.
Circuit preventing incorrect seek operation
Features
.
Excellent cross modulation characteristic: Meets the
requirements for preventing not only adjacent-channel
interference but also interference caused by all channels
within broadcast band.
.
Narrow-band signal meter output: Usable as auto search stop
signal. Has linearity up to 100 dB.
.
Local oscillation buffer output: Facilitates designing of
electronic tuner system, frequency display, etc.
.
OSC (with ALC): Improves tracking error because
oscillation output is stabilized at a low level (350 mVrms:
LA1137N) for varactor diode.
.
MIX: Double-balanced differential MIX meeting the
requirements for preventing spurious interference, IF
interference.
.
Good characteristic at high input: 130 dB input
fm = 400 Hz 80%mod THD = 0.5% typ.
.
High S/N: Good S/N at medium input (55 dB typ).
.
Usable sensitivity: (S/N = 20 dB input): 25 dB
(when using 2SK715 )
.
V
CC
variation compensation: Less variation in gain,
distortion: 8 to 12 V
AM stereo capability (LA1136N only)
.
IF band switching circuit on chip; controlled by
microcontroller
.
Oscillating circuit for AM stereo; SUB S/N improved to
6 dB
.
IF output for AM stereo decoder
.
Improved tweet characteristics: 10 dB increase, controlled by
microcontroller
.
Improved cross modulation characteristics, especially
sensitivity suppression characteristics: 15 dB improvement,
wide-band AGC operation even for SW band interference
.
Improved low-frequency modulation distortion
.
Improved temperature characteristics: S-meter, SD sensitivity
.
Faster RF AGC response: RF: 1/3; IF: 1/8 (compared to
predecessors)
.
Improved capability for driving external RF AGC transistors:
I
B
max = 200 A
.
Measures to prevent incorrect seek operation
.
IF count buffer on chip; controlled by microcontroller
.
Time constant switching circuit on chip for RF and IF
AGC
.
IF AGC clear circuit on chip
.
Measures that prevent stopping one station too soon
Ordering number: EN 3507
Monolithic Linear IC
LA1136N, 1136NM, 1137N, 1137NM
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
93097HA(II)/4281TS(US) No.3507-1/28
Package Dimensions
unit : mm
3067-DIP24S
[LA1136N]
SANYO : DIP24S
unit : mm
3021B-DIP20S
[LA1137N]
SANYO : DIP20Slim
unit : mm
3112-MFP24S
[LA1136NM]
SANYO : MFP24S
unit : mm
3036B-MFP20
[LA1137NM]
SANYO : MFP20
Allowable
power
dissipation,
Pd
max
m
W
Ambient temperature, Ta C
Allowable
power
dissipation,
Pd
max
m
W
Mounted on 20
40
1.5 mm PCB
Independent IC
Ambient temperature, Ta C
Pd max Ta
Pd max Ta
LA1136N, 1136NM, 1137N, 1137NM
No. 3507-2/28
Specifications
Maximum Ratings
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
Pin 19 (LA1136N), Pin 15 (LA1137N)
12
V
Output voltage
V
O
1
Pin 6
13.4
V
V
O
2
Pin 13 (LA1136N), Pin 10 (LA1137N)
15.5
V
Input voltage
V
IN
Pin 5
5.6
V
Current drain
I
CC
Pin 15+6+10, V
11
= 0 (LA1137N)
Pin 6+13+19, V
14
= 0 (LA1136N)
60
mA
Flow-out current
I
20
Pin 20 (LA1137N), Pin 24 (LA1136N)
2
mA
Allowable power
dissipation
Pd max
Ta
%
65C (LA1136N),
Ta
%
77C (LA1137N)
680
mW
Pd max1
Independent IC, Ta
%
47C (LA1136NM)
540
mW
Pd max2
With PCB, Ta
%
80C (LA1136NM)
680
mW
Pd max1
Independent IC, Ta
%
63C (LA1137NM)
540
mW
Pd max2
With PCB, Ta
%
77C (LA1137NM)
680
mW
Operating temperature
Topr
40 to +85
C
Storage temperature
Tstg
40 to +125
C
Operating Conditions
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Recommended supply
voltage
V
CC
8
V
Supply voltage range
V
CC
op
7.5 to 10
V
Allowable
power
dissipation,
Pd
max
m
W
Ambient temperature, Ta C
Allowable
power
dissipation,
Pd
max
m
W
Mounted on 20
40
1.5 mm PCB
Independent IC
Ambient temperature, Ta C
Pd max Ta
Pd max Ta
LA1136N, 1136NM, 1137N, 1137NM
No. 3507-3/28
LA1136N, LA1136NM
Operating Conditions
at Ta = 25C, V
CC
= 8 V, fr = 1 MHz, fm = 400 Hz, See specified Test Circuit
Parameter
Symbol
Conditions
Pin
min
typ
max
Unit
12
14
17
22
Current drain
I
CC
1
Quiescent
L
L
L
O
22
38
52
mA
I
CC
2
130 dB
L
L
L
O
30
45
60
Detection output
V
O
74 dB, 30% modulation
L
L
L
O
15.0
12.0
9.0
dBm
Signal-to-noise ratio
S/N
74 dB, 30% modulation
L
L
L
O
49
54
dB
AGC figure-of-merit
AGC
74 dB, 30% modulation,
reference output 10 dB below
input
L
L
L
O
50
54
dB
Total harmonic distortion
THD1
74 dB, 80% modulation
L
L
L
O
0.4
1.0
%
THD2
130 dB, 80% modulation
L
L
L
O
0.5
2.0
Signal meter output voltage
V
SM
1
Quiescent
L
L
L
O
0
0.3
V
V
SM
2
130 dB
L
L
L
O
3.5
5.0
7.5
Stop detector sensitivity
SD
V
18
= 3.5 V
L
H
L
O
26
32
38
dB
Local-oscillator buffer output
voltage
V
OSC
BUFF
Quiescent
L
L
L
O
270
330
mVrms
IF buffer output voltage
V
IF
BUFF 74 dB, zero modulation
L
L
L
O
530
750
1,000
mVrms
IF count buffer output voltage
V
IFCB
30 dB, zero modulation
L
H
H
O
260
300
mVrms
IF count buffer output leakage
voltage
V
IFCBL
74 dB, zero modulation
L
L
L
O
10
mVrms
Antenna input level for RF AGC
ON and tweet prevention
ANT1
L
L
L
L
56
62
68
dB
Antenna input for wideband AGC
ON
ANT2
Quiescent, 1.0 MHz receive
signal, 1.4 MHz interference,
zero modulation
L
L
L
O
92
98
104
dB
Wideband/narrowband detector
output ratio (weak input)
21 dB, 30% modulation
L/H
L
L
O
2
4
dB
Pin-diode driver current
I
ANTD
V
1
= 0.7 V
L
L
L
O
4.0
5.5
mA
Note)
SW voltage: H = 5 V, L = GND, O = OPEN
LA1137N, LA1137NM
Operating Characteristics
at Ta = 25C, V
CC
= 8 V, fr = 1 MHz, fm = 400 Hz, See specified Test Circuit
Parameter
Symbol
Conditions
SW
min
typ
max
Unit
11
13
18
Current drain
I
CC
1
Quiescent
L
L
O
22
38
52
mA
I
CC
2
130 dB, zero modulation
L
L
O
30
45
60
Detection output
V
O
74 dB, 30% modulation
L
L
O
15.0
12.0
9.0
dBm
Signal-to-noise ratio
S/N
74 dB, 30% modulation
L
L
O
50
55
dB
AGC figure-of-merit
AGC
74 dB, 30% modulation,
reference output 10 dB below
input
L
L
O
48
52
56
dB
Total harmonic distortion
THD1
74 dB, 80% modulation
L
L
O
0.3
1.0
%
THD2
130 dB, 80% modulation
L
L
O
0.4
2.0
Signal meter output
voltage
V
SM
1
Quiescent
L
L
O
0
0.3
V
V
SM
2
130 dB, zero modulation
L
L
O
3.5
5
7.5
Stop detector sensitivity
SD
V
18
= 3.5 V, zero modulation
H
L
O
27
33
39
dB
Local-oscillator buffer
output voltage
V
OSC
BUFF
Quiescent
L
L
O
290
350
mVrms
IF count buffer output
voltage
V
IFCB
30 dB, zero modulation
H
H
O
260
300
mVrms
IF count buffer output
leakage voltage
V
IFCBL
74 dB, zero modulation
L
L
O
10
mVrms
Antenna input for RF
AGC ON and tweet
prevention
ANT1
L
L
L
56
62
68
dB
Antenna input for wide
band AGC ON
ANT2
Quiescent, 1.0 MHz receive
signal, 1.4 MHz interference
signal, zero modulation
L
L
O
92
98
104
dB
Pin-diode driver current
I
ANTD
V
1
= 0.7 V
L
L
O
4.0
5.5
mA
Note)
SW voltage: H = 5 V, L = 0 V, O = open
Short the ammeter used to measure the pin-diode driver current when not in use.
LA1136N, 1136NM, 1137N, 1137NM
No. 3507-4/28
LA1136N, LA1136NM Test Circuit
High
frequency
signal
level
meter
V
oltmeter
S-meter
output
High
frequency
signal
level
meter
IHF
signal
level
meter
with
bandpass
filter
Distortion
meter
High
frequency
signal
level
meter
Unit
(resistance:
,
capacitance:
F)
LA1136N, 1136NM, 1137N, 1137NM
No. 3507-5/28
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