LA1143
Pd max
– Ta
Muting by varying R
15-G
Ambient temperature, Ta
– °C
Muting by varying R
14-6
Proper cares in using LA1143
1. The detector transformers should be designed to develop a quadrature signal (pin 11) of higher than 175mVrms
(about 105dBµ) under high antenna signal input. If the quadrature signal strength is less than 125mVrms, the
muting drive output can not decrease to zero even in a strong signal strength. Furthermore, when the quadrature
signal strength lies between 125mV and 175mV, the muting drive output may move from zero to plus under high
temperature conditions.
2. Do not connect a capacitor directly between pin (16) and ground. If the signal intensity of IF input varies in the
vicinity of 90dBµ, the voltage at pin (16) varies. Thus, charging/discharging current flows into the capacitor and
goes to the muting drive output (pin (14)) through the inverter inside the IC, thereby causing the muting to
malfunction.
For detailed data and sample application circuits, refer to the catalog of the LA1140.
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 September, 1997. Specifications and information herein are
subject to change without notice.
No.1140-5/5
SANYO [ SANYO SEMICON DEVICE ]
