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PDF L8221 Data sheet ( Hoja de datos )
| Número de pieza | L8221 | |
| Descripción | CONTROL AND POWER MANAGEMENT SOLUTION | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UNISONIC TECHNOLOGIES CO., LTD
L8221
Preliminary
LINEAR INTEGRATED CIRCUIT
SINGLE LNB–BIAS, CONTROL
AND POWER MANAGEMENT
SOLUTION
DESCRIPTION
The UTC L8221 is a single chip power management and control
solution for LNB’s. The highly integrated solution provides all the
required FET and mixer bias, control detection and decoding, local
oscillator switching and a stable power supply for the IF amplifier
and additional support functions. Being at the heart of the LNB
monitoring the control, power management and environmental
conditions the UTC L8221 is able to provide reliable solution
eliminating effects such as false switching and over loading.
FEATURES
* Single chip LNB bias, control and power management
* 22kHz tone detector with signal rejection for band switching
* Zero Gate FET switching
* Integrated regulated supply for LNB
* Voltage detection for polarization switching
* Programmable mixer and FET bias
* Single pin for supply and control
* No external filtering required
* Temperature compensated protected FET bias
ORDERING INFORMATION
Ordering Number
L8221G-SH2-R
Package
HSOP-8
HSOP-8
Packing
Tape Reel
MARKING
www.unisonic.com.tw
Copyright © 2016 Unisonic Technologies Co., Ltd
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L8221
TEST CIRCUIT
Preliminary
LINEAR INTEGRATED CIRCUIT
The above is partial application circuit for the UTC L8221 series showing all external components required for
appropriate biasing. The bias circuits are unconditionally stable over the full temperature range with the associated
FETs and gate and drain capacitors in circuit. Capacitors C1 and C2 ensure that residual power supply and
substrate generator noise is not allowed to affect other external circuits which may be sensitive to RF interference.
They also serve to suppress any potential RF feed through between stages via the UTC L8221 device. These
capacitors are required for all stages used. Values of 10nF and 4.7nF respectively are recommended however this is
design dependent and any value between 1nF and 100nF could be used.
The capacitor CSUB is an integral part of the UTC L8221’s negative supply generator. The negative bias voltage
is generated on-chip using an internal oscillator. The required value of capacitor CSUB is 47nF. This generator
produces a low current supply of approximately -3 volts. Although this generator is intended purely to bias the
external FETs, it can be used to power other external low current circuits via the CSUB pin.
The UTC L8221 devices have been designed to protect the external FETs form adverse operating conditions.
With a JFET connected to any bias circuit, the gate output voltage of the bias circuit can not exceed the range
-3.0V~1V under any conditions, including power up and power down transients. Should the negative bias generator
be shorted or overloaded so that the drain current of the external FETs can no longer be controlled, the drain supply
to FETs is shut down to avoid damage to the FETs by excessive drain current. The UTC L8221 incorporates over
and under voltage protection so is the receiver or installation develops a fault the LNB will shut down and restart
once operating conditions are back to normal.
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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| PDF Descargar | [ Datasheet L8221.PDF ] | |
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