Texas Instruments TSW2110EVM: Low Cost Crystal Filtered 10MHz Source TSW2110EVM TSW2110EVM Scheda Tecnica
Codici prodotto
TSW2110EVM
PC
USB
CLK
AC-to-DC
5V PS
AC-to-DC
19V PS
TSW4806
(Clock Gen)
TSW2110
ADS4249
(Dual ADC)
TSW1400
(Data Capt)
TSW2200
(Pwr dist)
User's Guide
SLAU438 – March 2012
TSW2110EVM Evaluation Module (EVM)
This user’s guide describes the operation of the TSW2110 input signal generator evaluation module
(EVM). The 10-MHz EVM is used to verify the functionality of various TI analog-to-digital converters
(ADCs). The guide includes setup instructions for the hardware, expected results captured from a
TSW1400EVM and an ADS4249EVM. The TSW2110EVM product folder on the TI web site contains the
EVM schematic, bill of materials, and layout files.
(EVM). The 10-MHz EVM is used to verify the functionality of various TI analog-to-digital converters
(ADCs). The guide includes setup instructions for the hardware, expected results captured from a
TSW1400EVM and an ADS4249EVM. The TSW2110EVM product folder on the TI web site contains the
EVM schematic, bill of materials, and layout files.
Figure 1. Block Diagram for Testing
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Introduction
The TI TSW2110EVM (EVM) helps designers evaluate the functionality of their ADC devices. This product
eliminates the expense of using a signal generator to create an input signal.
eliminates the expense of using a signal generator to create an input signal.
The board is powered off a bench power supply or the 5-V output which is found on the TSW2200EVM. A
red and black banana jack to easy hook patch cable delivers the required voltage to the EVM. An external
clock generator is required to provide a sampling clock for the ADC board to capture correctly. For the
captures conducted in this document, a 245.76-MHz clocking signal from the TSW4806EVM was used.
red and black banana jack to easy hook patch cable delivers the required voltage to the EVM. An external
clock generator is required to provide a sampling clock for the ADC board to capture correctly. For the
captures conducted in this document, a 245.76-MHz clocking signal from the TSW4806EVM was used.
The EVM has a default setup expecting an input voltage of 5 V. With this voltage applied, a temperature-
controlled crystal oscillator (TCXO) generates a HCMOS waveform at 10 MHz. Using amplification,
attenuation and filtering, a 10-MHz signal is generated with low harmonic distortion output. The output
waveform is set to +10 dBm (2 Vpp), which is used as the input to an ADC board.
controlled crystal oscillator (TCXO) generates a HCMOS waveform at 10 MHz. Using amplification,
attenuation and filtering, a 10-MHz signal is generated with low harmonic distortion output. The output
waveform is set to +10 dBm (2 Vpp), which is used as the input to an ADC board.
The TCXO is powered from the 3.3-V output of the low-dropout (LDO) regulator in its default mode. This
applied voltage generates a 10-MHz, HCMOS signal with an amplitude of 10.6 dBm.
applied voltage generates a 10-MHz, HCMOS signal with an amplitude of 10.6 dBm.
The output waveform of the TCXO is attenuated by a 15dB pad prior to going into the input of the
amplifier. This amplifier requires an input signal with an amplitude of approximately –5 dBm. At this input
level, a gain of 20 dB is achieved without creating additional harmonic distortion. The amplifier output
waveform is +15 dBm and has significant harmonics. A crystal filter (part number, FTR-80307) is
necessary to eliminate these harmonics. A 1db pad is installed after the amplifier to maintain 50-
amplifier. This amplifier requires an input signal with an amplitude of approximately –5 dBm. At this input
level, a gain of 20 dB is achieved without creating additional harmonic distortion. The amplifier output
waveform is +15 dBm and has significant harmonics. A crystal filter (part number, FTR-80307) is
necessary to eliminate these harmonics. A 1db pad is installed after the amplifier to maintain 50-
Ω
termination and reduce the impact of impedance mismatches.
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SLAU438 – March 2012
TSW2110EVM Evaluation Module (EVM)
Copyright © 2012, Texas Instruments Incorporated