Difference between revisions of "LFTX/LFRX"

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Revision as of 15:59, 10 June 2016

Device Overview

The LFTX daughterboard utilizes two high-speed operational amplifiers to allow transmission from 0-30 MHz. The LFTX is ideal for applications in the HF band, or for applications using an external front end to up-convert and amplify the intermediate signal. The outputs of the LFTX can be processed independently, or as a single I/Q pair. Example applications include HF communications, radios with external front ends and direct signal generation below 30 MHz.

Key Features

DC-30Mhz coverage

Daughterboard Specifications

Frontends

LFRX

The LFRX has 4 frontends:

• Frontend A: real signal on antenna RXA
• Frontend B: real signal on antenna RXB
• Frontend AB: quadrature frontend using both antennas (IQ)
• Frontend BA: quadrature frontend using both antennas (QI)

LFTX

The LFTX has 4 frontends:

• Frontend A: real signal on antenna TXA
• Frontend B: real signal on antenna TXB
• Frontend AB: quadrature frontend using both antennas (IQ)
• Frontend BA: quadrature frontend using both antennas (QI)

Gains

LFRX

• The LFRX has no tunable elements or programmable gains. Through the magic of aliasing, you can down-convert signals greater than the Nyquist rate of the ADC.

LFTX

• The LFTX has no tunable elements or programmable gains. Through the magic of aliasing, you can up-convert signals greater than the Nyquist rate of the DAC.

Bandwidths

LFRX

• For Real-Mode (A or B frontend): 33 MHz
• For Complex (AB or BA frontend): 66 MHz

LFTX

• For Real-Mode (A or B frontend): 33 MHz
• For Complex (AB or BA frontend): 66 MHz

Hardware Specifications

• Ettus Research recommends to always use the latest stable version of UHD

LFRX

• Current Hardware Revision: 1
• Minimum version of UHD required: 3.8.0

LFTX

• Current Hardware Revision: 1
• Minimum version of UHD required: 3.8.0

Environmental Specifications

Operating Temperature Range

• 0-40 °C

Operating Humidity Range

• 10% to 90% non-condensing

USRP Compatibility

LFRX

• N or X Series

LFTX

• N or X Series

Schematics

LFRX

LFRX Schematics

LFTX

LFTX Schematics

Key Component Datasheets

Part Number	Description	Schematic ID (Page)
AD813x	Differential ADC Driver	U2, U3 (1)
LT3462	DC/DC Converter	U3 (1)
24LC025B	EEPROM	U1 (1)

RF Connectors

• The LFTX / LFRX daughterboard features female SMA connectors for both the TX and RX connectors.

Certifications

RoHS

As of December 1st, 2010 all Ettus Research products are RoHS compliant unless otherwise noted. More information can be found at http://ettus.com/legal/rohs-information

Downloads

FPGA Resources

UHD Stable Binaries

UHD Source Code on Github