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AT1511 Datasheet(PDF) 1 Page - Aimtron Technology

Part No. AT1511
Description  FET BIAS CONTROLLER AND TONE DETECTION
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Maker  AIMTRON [Aimtron Technology]
Homepage  http://www.aimtroncorporation.com/index.php
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AT1511 Datasheet(HTML) 1 Page - Aimtron Technology

   
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AT1511
Preliminary product Information
FET BIAS CONTROLLER AND TONE DETECTION
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: service@aimtron.com.tw
1
Features
Provides bias for GaAs and HEMT FETs
Drives up to three FETs
Dynamic FET protection
Drain current set by external resistor
Regulated negative rail generator requires
only 2 external capacitors
Choice in drain voltage
Wide supply voltage range
Polarisation switch for LNBs - supporting
zero volt gate switching
topology.
22kHz tone detection for band switching
Compliant with ASTRA control specifications
SSOP surface mount package
Applications
˙
Satellite receiver LNBs
˙
Private mobile radio (PMR)
˙
Cellular telephones
Description
The AT1511 includes bias circuits to drive up to
three external FETs. A control input to the
device selects either one of two FETs as
operational
using
0V
gate
switching
methodology, the third FET is permanently
active. This feature is particularly used as an
LNB polarisation switch. Also specific to LNB
applications is the enhanced 22kHz tone
detection and logic output feature which is used
to enable high and low band frequency switching.
The detector has been specifically designed to
reject inerference such as low frequency signals
and DiSEqCTM tone bursts - without the use of
additional external components.
Drain current setting of the AT1511 is user
selectable over the range 0 to 15mA, this is
achieved with the addition of a single resistor.
The series also offers the choice of FET drain
voltage, the AT1511 gives 2 volts.
These devices are unconditionally stable over
the full working temperature with the FETs in
place,
subject
to
the
inclusion
of
the
recommended gate and drain capacitors. These
ensure RF stability and minimal injected noise.
It is possible to use less than the devices full
complement of FET bias controls, unused drain
and gate connections can be left open circuit
without affecting operation of the remaining bias
circuits.
In order to protect the external FETs the circuits
have been designed to ensure that, under any
conditions including power up/down transients,
the gate drive from the bias circuits cannot
exceed the range -3.5V to 1V. Furthermore if the
negative rail experiences a fault condition, such
as overload or short circuit, the drain supply to
the FETs will shut down avoiding excessive
current flow.
The AT1511 are available in SSOP20 for the
minimum in device size. Device operating
temperature is -40 to 70°C to suit a wide range
of environmental conditions.
Aimtron reserves the right without notice to change this circuitry and specifications.


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