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Circuit Description
2.2.2
EVM Power Connections
Power is supplied to the EVM through banana jacks. From this input power, several different ways of
delivering power to the ADC and other EVM functions are available.
representation of the power options available for the ADS62PXXEVM. The default option is to provide 5V
to the red banana jack J10, and from there, the EVM generates 3.3V for the analog supply to the ADC
and the necessary digital supply voltage for the populated ADC. The EVM also generates the proper
voltages for optional features of the EVM such as the Clock Generation circuitry, the USB circuitry, and
the CMOS output buffer.
Some ADC devices that may be evaluated on the ADS62PXXEVM platform do not take 1.8V for the digital
supply, but rather require 3.3V for the digital supply. For this reason, an adjustable voltage regulator was
chosen for the digital supply; the output may be changed to 3.3V by changing the value of a resistor, R269
and capacitor C148. The resistor and capacitor need not to be changed in the field unless the ADC is
being changed, because the EVM ships with the correct digital supply voltage for the ADC that is installed.
For reference, ADS62P42/43/44/45,ADS62P22/23/24/25 and ADS62C15 use 3.3V as digital supply for the
ADC whereas ADS62P48/49,ADS62P28/29 and ADS62C17 use 1.8V as digital supply for the ADC.
Power for the optional THS4509 operational amplifier is supplied by banana jacks J11 and J13. If the
amplifier is being evaluated in AC coupled configuration, 5V is supplied to J11, and J13 is connected to
ground. In DC-coupled configuration, 4V is supplied to J11 and –1V is supplied to J13. Otherwise, these
inputs may be left unconnected.
Although various power options are available on this EVM, care must be taken while applying power on
J10 as different options have different voltage ranges specified.
setting information;
settings, see the schematics located at the end of this document.
Voltage limits: Exceeding the maximum input voltages can damage EVM
components. Undervoltage can cause improper operation of some or all of the
EVM components.
10
ADS62PXXEVM
Figure 3. ADS62PXXEVM Power Distribution
Table 3
displays the various power option settings. Prior to making any jumper
Figure 3
Table 2
displays the general jumper
CAUTION
SLAU237A – May 2008 – Revised April 2009
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shows a simplified
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