Texas Instruments TRF3711xxEVM Series, Руководство пользователя

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TRF3711xx
LNA
TRF3761
ADS62P42
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Introduction
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1 Introduction
1.1 Overview
This document is the user’s guide for the TRF3711xxEVM. The TRF3711xx is a receiver direct
downconvert quadrature demodulator that includes programmable baseband filters, adjustable dc offset
correction, and buffer amplifiers to directly drive ADCs. The device is suited for operation with WCDMA,
WiMAX, and LTE modulation as well as with other high-bandwidth signal modulation schemes.
Note: Unless otherwise noted, the abbreviations TRF3711xxEVM and TRF3711xx are used in this
document to refer to all members of this device family (including the TRF371109, TRF371125, and
TRF371135).
Table 1 summarizes the TRF3711xx device frequency options and lists the recommended
balun for each device.
Table 1. TRF3711xx Device Frequencies and Recommended Baluns
(1)
Frequency Device Recommended Balun
700 MHz TRF371109, TRF371125 Murata LDB21897M05C
880 MHz TRF371109, TRF371125 Murata LDB21881M05C
940 MHz TRF371109, TRF371125 Murata LDB21942M05C
1740 MHz TRF371125, TRF371135 Murata LDB211G8005C
1950 MHz TRF371125, TRF371135 Murata LDB211G9005C
2025 MHz TRF371125, TRF371135 Murata LDB211G9005C
2500 MHz TRF371125, TRF371135 Murata LDB212G4005C
3550 MHz TRF371125, TRF371135 Johanson 3600BL14M050E
5400 MHz TRF371135 Johanson 5400BL15B050E
(1)
There is considerable overlap in the operating frequency range of the TRF3711xx family of devices.
Refer to the specific device data sheet and compare performance parameters at the frequencies of
interest to select the best part for a particular application.
1.2 EVM Frequency Configuration Options
The TRF3711xx device is inherently broadband; however, the RF input and LO input require differential
input, which is generally achieved with the use of an RF balun. The EVM can be configured with a
different balun to facilitate operation in the desired band. Inspect the board at R101 to R105 to determine
which balun is populated on the board.
1.3 System Block Diagram
The basic radio system block diagram in Figure 1 demonstrates where the TRF3711xx fits in the overall
receiver architecture. The bold box highlights the TRF3711xx device.
Figure 1. System Block Diagram
2 TRF3711xxEVM SLWU069B – February 2010 – Revised November 2010
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