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1.5 W P-1 dBm Linear, 30-dB Gain Transmitter
Operates Over the MMDS, MDS, and WCS
Bands (2.1 GHz to 2.7 GHz)
Two TTL Controlled, 1-bit, 16-dB Gain Steps
Superior Linearity Over the Entire Gain Range
PACNT Signal Enables and Disables PA
Internally Matched 50-鈩?Input and Output
VPOS
VNEG
VDD
Power
Supply
PACNT
LP
Driver
Amplifier
Pre鈭扐mp
RFI
Power Amp /
Attenuator
RFO
DETN
DETP
PAGAIN1
PAGAIN0
DESCRIPTION
The TRF1123 is a highly integrated linear transmitter power amplifier MMIC. The chip has two 16-dB gain steps
that provide a total of 32-dB gain control via 1-bit TTL control signals. The chip also integrates a TTL mute
function that turns off the amplifiers for power critical or TDD applications. A temperature compensated detector
is included for output power monitor or ALC applications. The chip has a typical P1dB of 31.5 dBm and a third
order intercept of 52 dBm.
The TRF1123 is designed to function as a part of Texas Instruments complete 2.5-GHz chip set. The TRF1123 is
used as the output power amplifier or a driver amplifier for higher power applications. The linear nature of the
transmitter makes it ideal for complex modulations schemes such as high order QAM or OFDM.
KEY SPECIFICATIONS
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OP
1dB
= 31.5 dBm, Typical
Output IP3 = 52 dBm, Typical
Gain = 30 dB, Typical
Gain Flatness Over Transmit Band 鹵2.5 dB
Frequency Range: 2.1 GHz to 2.7 GHz
鹵0.5-dB Detected Output voltage vs Temperature
BLOCK DIAGRAM
The detailed block diagram and the pin-out of the ASIC are shown in
Figure 1.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright 漏 2005, Texas Instruments Incorporated
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