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Sanyo Electric Components Datasheet

LA1245 Datasheet

AM Electronic Tuner

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Ordering number : EN737G
Monolithic Linear IC
LA1245 AM Electronic Tuner
Overview
LA1245 is a high performance IC to be used as an AM electronic tuner. It provides an automatic search-stop signal, local
oscillator buffer-output, and the low level local oscillation, as well as providing all other functions required of an AM tuner.
Moreover, the stable local oscillation from LW to SW facilitates the use of many band.
Features
Narrow-band signal meter
: Available as an automatic search-stop signal (also available as a wide-band signal
meter). Signal meter output = 1/2 frequency ±1.5kHz typ.
Local oscillation buffer-output : Facilitates the design of electronic tuning systems and frequency representation.
OSC (with ALC)
: The oscillation output is stabilized at a low level (350mVrms) for a varactor diode,
and tracking error is minimized.
RF amplifier
: Excellent in usable sensitivity by incorporating low-noise transistors in cascade
circuit (45dB/m typ).
MIX
: Double balanced differential MIX prevents the influence of spurious radiation and
IF interferences (IF interference = 85dB typ).
Low noise
: Excellent in S/N for intermediate input (57dB typ).
Compensation for VCC fluctuation : Allows little gain fluctuation and little distortion fluctuation (8 to 16V).
Low shock noise
: Able to decrease the shock noise by selecting AGC time constant when changing
VCC-on and/or switching the mode.
Functions
RF amplifier
MIX
OSC (with ALC)
Detection
IF amplifier
AGC
Local oscillation buffer-output
Signal meter driving output (also used as an automatic search stop-signal)
etc.
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer's products or
equipment.
71608 MS JK/63097HA (KOTO)/33194HO/N050JK/8044KI,TS3173KI/O020KI No.737-1/12


Sanyo Electric Components Datasheet

LA1245 Datasheet

AM Electronic Tuner

No Preview Available !

Specifications
Maximum Ratings at Ta = 25°C
Parameter
Supply voltage
Output voltage
Input voltage
Supply current
Output high drive current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
VO
VI
ICC max
I18
I20
Pd max
Topr
Tstg
LA1245
Conditions
Pin 8, 14
Pin 5, 7
Pin 3
Pin 5+7+8+14
Pin 18
Pin 20
See Figure 2
Ratings
16
24
5.6
32
5
2
700
20 to +70
40 to +125
Unit
V
V
V
mA
mA
mA
mA
°C
°C
Recommended Operating Conditions at Ta = 25°C
Parameter
Recommended supply voltage
Symbol
VCC
Conditions
Ratings
Unit
12 V
Electrical Characteristics at Ta = 25°C, VCC = 12V, fr = 1MHz, fm = 400Hz, at specified test circuit
(based on application circuit).
Parameter
Current drain
Detection output
Signal to noise ratio
Total harmonic distortion
Signal meter output
Input at signal meter output = 1V
Local oscillation-buffer output
Symbol
ICC1
ICC2
VO1
VO2
S/N1
S/N2
THD1
THD2
VSM1
VSM3
VIN1
VOSC
Conditions
quiescent
107dBμ input
23dBμ input, mod. 30%
80dBμ input, mod. 30%
23dBμ input, mod. 30%
80dBμ input, mod. 30%
80dBμ input, mod. 30%
107dBμ input, mod. 30%
quiescent
107dBμ input
VSM output = 1V
min
16.0
19.0
27.5
15.5
16
52
3.0
19.0
250
Ratings
typ
25.0
29.0
23.0
12.5
20
57
0.4
0.3
0
4.5
25.0
350
max
35.0
40.0
18.5
9.5
1.0
1.0
0.5
7.0
31.0
Unit
mA
mA
dBm
dBm
dB
dB
%
%
V
V
dBμ
mVrms
Reference Characteristics
Parameter
Symbol
Conditions
Signal meter output
Total harmonic distortion
VSM2
THD3
40dBμ input
112dBμ input, mod.30%
Local oscillation fluctuation within a
band
Signal meter band width*
Selectivity
ΔVOSC
VSM-BW1
VSM-BW2
VOSCL (522kHz) to VOSCH (1647kHz)
80dBμ input, 1/2 output frequency
80dBμ input, 1/10 output frequency
±10kHz at 30% mod.
IF interference
fr = 600kHz
Image frequency interference ratio
fr = 1400kHz
* BFB450C4 N (Murata, Co.,) was used as a narrow band filter.
(Note) 0dBm = 775mV, 0dBu = 1μV.
min
Ratings
typ
2.5
2
10
±1.5
4.5/+7
45
85
40
max
Unit
V
%
mVrms
kHz
kHz
dB
dB
dB
No. 737-2/12


Part Number LA1245
Description AM Electronic Tuner
Maker Sanyo
Total Page 12 Pages
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