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ADS5220EVM 产品设计参考手册 - TI（德州仪器）
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数据转换 IC 开发工具 ADS5120 Eval Mod
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ADS5220EVM数据手册
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1.6 Installation Note
Overview
2. Connect supplies to the EVM in this sequence:
– External buffer supply (V
DD_Buf
) to J7(1) and return to J7(3)
– +2.5v to 3.3V ADC output buffer supply (VDRV) to J7(2) and return to J7(3)
– Supply ground to J7(3)
– +3.3V ADC analog supply (DUTA) to J7(5) and return to J7(3)
– +3.3V ADC digital supply (DUTD) to J7(4) and return to J7(3)
– +3.3V clock driver supply (V
DD_CLK
) to J7(6) and return to J7(3)
– When R51 and R9 are installed (default configuration), J7(5) and J7(6) should not be connected to
the supply.
3. Switch power supplies on.
4. Use a function generator with a 50 Ω output to input a 65MHz signal for the ADS5221 (40MHz for the
ADS5220); for both devices, use a 0V offset, 0.7V
RMS
sine wave signal into J3 (clock input). The
frequency and amplitude of the clock must be within the specification for the device speed grade.
5. Use a function generator with a 50 Ω output to provide a 10MHz, 0V offset and -1dBFS amplitude sine
wave signal into J1 (analog input). This will provide a transformer-coupled differential input signal to
the ADC.
6. The digital pattern on the output connector J5 should now represent a sine wave and can be monitored
using a logic analyzer.
The default operational mode on the ADS522xEVM is mode one: differential input through a transformer.
The following components should not be installed when the EVM is in default mode.
1. Components that have the symbol “*”
2. Components that have the symbol “(2)”
3. Components that have the symbol “(3)”
All other components in the schematic should be installed when using the EVM in default mode. Be sure
that the following components are also installed:
1. Components that have the symbol “(1)(2)”
2. SN74LVTH16374 should be installed for U4
1.6.1 Related Documentation from Texas Instruments
The following documents provide information regarding Texas Instrument integrated circuits used in the
assembly of the ADS522xEVM. The latest revisions of these documents are available from the TI web site
at http://www.ti.com.
Data Sheet Literature Number
ADS5220 Datasheet SBAS261
ADS5221 Datasheet SBOS262
ADS522xEVM User's Guide4 SBAU094 – June 2005
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