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UTCL8115 Datasheet

  • UTCL8115

  • FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECT...

  • 13頁

  • UTC-IC

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UTC L8115
LINEAR INTEGRATED CIRCUIT
FET BIAS CONTROLLER WITH
POLARISATION SWITCH AND
TONE DETECTION
DESCRIPTION
The UTC L8115 is designed to meet the bias
requirements of GaAs and HEMT FETs commonly used in
satellite receiver LNBs, PMR, cellular telephones etc. with
a minimum of external components.
With the addition of two capacitors and a resistor the
devices provide drain voltage and current control for three
external grounded source FETs, generating the regulated
negative rail required for FET gate biasing whilst operating
from a single supply. This negative bias, at -2.8 volts, can
also be used to supply other external circuits.
The UTC L8115 includes bias circuits to drive up to three
external FETs. A control input to the device selects either
one of two FETs as operational, the third FET is
permanently active. This feature is normally used as an
LNB polarization switch. Also specific to Universal LNB
applications is the 22kHz tone detection and logic output
feature which is used to enable high and low band
frequency switching.
Drain current setting of the UTC L8115 is user selectable
over the range 0 to 15mA, this is achieved with addition of
a single resistor. The UTC L8115 gives 2.2 volts drain
whilst.
SSOP-16(150mil)
SSOP-20(150mil)
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
*22KHz tone detection for band switching.
*Tone detector ignores unwanted signals
*Support fr MIMIC, FET and Bipolar local oscillator devices
APPLICATIONS
*Satellite receiver LNBs
*Private mobile radio(PMR)
*Cellular telephones
UTC
UNISONIC
TECHNOLOGIES
CO., LTD.
1
QW-R123-005,B

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