Texas Instruments TSW2110EVM: Low Cost Crystal Filtered 10MHz Source TSW2110EVM TSW2110EVM 数据表
产品代码
TSW2110EVM
Evaluation with the TSW2110
On the 8-pole crystal filter, FTR-80307, matching is tuned for optimal performance. This matching is
crucial for proper filter behavior and does not result in low output power. This filter attenuates the
harmonics lower than –80 dBc resulting in a clean sine wave that is used as an input to the ADC board.
Depending on which ADC is evaluated, the resulting carrier amplitude should be approximately –1 dBFS.
crucial for proper filter behavior and does not result in low output power. This filter attenuates the
harmonics lower than –80 dBc resulting in a clean sine wave that is used as an input to the ADC board.
Depending on which ADC is evaluated, the resulting carrier amplitude should be approximately –1 dBFS.
For information on the filter, contact PDI at
2
Evaluation with the TSW2110
This chapter details the evaluation process and features of the EVM. An external supply voltage must be
connected to the voltage in and ground test points (TP1 and TP2, respectively). A blue LED turns on if the
proper voltage is supplied. An SMA to SMA cable must be connected from the output SMA connector to
the input channel of the unit under test.
connected to the voltage in and ground test points (TP1 and TP2, respectively). A blue LED turns on if the
proper voltage is supplied. An SMA to SMA cable must be connected from the output SMA connector to
the input channel of the unit under test.
The board accepts a supply voltage of 5 V (default) or 3.3 V. Different jumper configurations are
necessary for these two options. If the board is supplied with 5 V, the charge pump is bypassed and the
LDO 3.3-V regulator is implemented. If 3.3 V is supplied, the regulator is bypassed and the charge pump
is used. The necessary configurations for each method are seen in
necessary for these two options. If the board is supplied with 5 V, the charge pump is bypassed and the
LDO 3.3-V regulator is implemented. If 3.3 V is supplied, the regulator is bypassed and the charge pump
is used. The necessary configurations for each method are seen in
. The board is clearly marked
with these points so that the proper jumper configuration can be implemented. Improper jumpers will not
damage the parts on the board; however, the system will not create the desired waveform for accurate
testing.
damage the parts on the board; however, the system will not create the desired waveform for accurate
testing.
Table 1. Jumper Configurations
Option
JP1
JP2, JP3
JP4, JP5
5 V (default)
Short 1-2
Opened
Shorted
3.3 V
Short 2-3
Shorted
Opened
3
Measurements
When the board is functioning properly, the output waveform measured on the SMA connector should
have 10 dBm of amplitude. The best way to get an accurate reading is when measured on a signal
analyzer with a 50-
have 10 dBm of amplitude. The best way to get an accurate reading is when measured on a signal
analyzer with a 50-
Ω
load termination. The testing for this user’s guide was done on a spectrum analyzer.
On many signal analyzers, the EVM output signal overdrives the machine in their default settings. RF
attenuation must be set to account for this. The data taken in
attenuation must be set to account for this. The data taken in
had the RF attenuation set to 25 dB
and set to 5 dB in
.
2
TSW2110EVM Evaluation Module (EVM)
SLAU438 – March 2012
Copyright © 2012, Texas Instruments Incorporated