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PDF LA1245 Data sheet ( Hoja de datos )
| Número de pieza | LA1245 | |
| Descripción | AM Electronic Tuner | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number : EN737F
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.
Functions
Package Dimensions
unit : mm
3021B-DIP20S
[LA1245]
• 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.
SANYO: DIP20S
Features
• Narrow-band signal meter
• Local oscillation buffer-output
• OSC (with ALC)
• RF amplifier
• MIX
• Low noise
• Compensation for VCC fluctuation
• Low shock noise
: Available as an automatic search-stop signal (also available as a wide-band signal
meter). Signal meter output=1/2 frequency ±1.5kHz typ.
: Facilitates the design of electronic tuning systems and frequency representation.
: The oscillation output is stabilized at a low level (350 mVrms) for a varactor
diode, and tracking error is minimized.
: Excellent in usable sensitivity by incorporating low-noise transistors in cascode
circuit (45dB/m typ).
: Double balanced differential MIX prevents the influence of spurious radiation and
IF interferences (IF interference = 85dB typ).
: Excellent in S/N for intermediate input (57dB typ).
: Allows little gain fluctuation and little distoriton fluctuation (8 to 16 V).
: Able to decrease the shock noise by selecting AGC time constant when changing
VCC-on and/or switching the mode.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
63097HA (KOTO)/33194HO/N050JK/8044KI,TS3173KI/O020KI No.737-1/11
1 page  
LA1245
8. When a cable or something similar is connected to a local oscillation buffer (pin 20), which is equivalent to
connecting a capacitor of about 20pF, the output from the buffer will be of sawtooth waves, causing the level low at
the short wave band. To prevent this, connect a resistor between pin 20 and GND, which will increase the operating
current of the buffer amplifier. Since the maximum current obtained from pin 20 is 2mA, the suitable resistance
between pin 20 and GND is 1.5kΩ.
9. Use a semi-fixed resistor for R211 to allow the fluctuation of VSM.
10. When changing an IFT or using an RF tuner, select a filter and related circuits according to the following conditions.
The input levels of each terminal where 30% modulated detection output of –25dBm is obtained are as follows :
Pin 11 input
when Rg=520Ω (470Ω + 50Ω)
75dBµ
Pin 9 input
when Rg=50Ω
53dBµ
Pin 6 input
when Rg=50Ω
48dBµ
Pin 3 input
when Rg=50Ω
22dBµ
Slight change in IFT, however, will be covered by changing the constant of resistors R202 and R204.
11. When the coupling coefficient of the local oscillation coil is small and an anti-resonance point of about 100MHz is
present or the stray capacitance between pin 19 and pin 20 is large, the buffer output (pin 20) may be subject to
parasitic oscillation of about 100MHz. In this case, connect a capacitor of about 30pF between pin 20 and GND. To
observe parasitic oscillation, connect a capacitor of 5pF in series with the probe. If the probe is connected direct to
pin 20, the input capacitance of the probe causes parasitic oscillation to stop, which makes it impossible to observe.
Sample Application Circuit 1
Unit (resistance : Ω, capacitance : F)
No.737-5/11
5 Page 
LA1245
(4) Variable Capacitor (C123A Alps Co.,)
c max
326.8 pF
c min
6.7 pF
(5) Variable Capacitor Diode (SVC332 Sanyo)
(6) IFT (I) (CMFQ-021A Toko Co.,)
(7) IFT (II)
(8) Narrow Band Resonator (BFB450C4 N Murata Co.,)
No products described or contained herein are intended for use in surgical implants, life-support systems,
aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and
the like, the failure of which may directly or indirectly cause injury, death or property lose.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates,
subsidiaries and distributors and all their officers and employees, jointly and severally, against any
and all claims and litigation and all damages, cost and expenses associated with such use:
Not impose any responsibilty for any fault or negligence which may be cited in any such claim or
litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of
their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guarant-
eed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees
are made or implied regarding its use or any infringements of intellectual property rights or other rights of
third parties.
This catalog provides information as of June, 1997. Specifications and information herein are subject to
change without notice.
No.737-11/11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LA1245.PDF ] | |
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