Laird Controls North America Inc. 86942 Manual De Usuario
9S21-8694-A001
Laird™ proprietary and confidential
Page
8 of 12
Revision: A, Approved
2
F
EATURES
S
UMMARY
2.1 G
ENERAL
A
RCHITECTURE
The Laird Transceiver consists of a UHF Receiver as well as a UHF Transmitter section that is controlled by a
digital subsection providing and processing protocol and control functions for the overall radio requirements.
digital subsection providing and processing protocol and control functions for the overall radio requirements.
The transceiver is intended to be powered using an externally provided 12VDC supply.
The overall current consumption @ 12VDC in RX mode is about 110mA.
The Transmit section was designed to provide a nominal output power of +27dBm into a 50 ohm load.
The overall current consumption for TX is an additional 450mA, resulting in a total current during TX of about
560mA.
560mA.
The RF section is contained in a shielded enclosure that has openings for four 50ohm SMB connections:
1. ANT1 --- RX input 1
2. ANT2 --- RX input 2
3. ANT3 --- RX input 3
4. TX OUT
2. ANT2 --- RX input 2
3. ANT3 --- RX input 3
4. TX OUT
In addition to these there are openings for visual observation of the PLL Lock status, as well as two alignment
points, one adjusting the 2
points, one adjusting the 2
nd
RX LO frequency and adjusting the RX Quadrature detector.
There is no need to trim the TX and the RX front end sections,
The following sections will contain a detailed description of the different circuit blocks pertaining to the
transceiver.
transceiver.
2.2 P
OWER SUPPLIES AND
R
EGULATORS
A nominal external 12VDC is supplied to the assembly using P101 pin 7 (positive) and pin 10 (negative).
This input is directly fed to U113 (LT1961EMS8-5#PBF) and to U5004 (KA7809). The +5VDC output of U113 is
used to supply the digital section as well as the RX DATA buffer and shaping amplifiers and the modulation
active filter chain, this +5V supply voltage feeds also a 2.7V voltage regulator to supply the ADC reference
voltage for the CPU (U6001 – ADP160AUJZ-2.7).
used to supply the digital section as well as the RX DATA buffer and shaping amplifiers and the modulation
active filter chain, this +5V supply voltage feeds also a 2.7V voltage regulator to supply the ADC reference
voltage for the CPU (U6001 – ADP160AUJZ-2.7).
The +9VDC output is used to feed the RF RX regulator MIC5216-5.0 (U4) which provides +5V to the synthesizer
and RX chain.
and RX chain.
The +9V output is also used to supply regulator U52002 (KA7805) which is powering the TX Driver and PA stages.