ADS8638EVM-PDK Kit Operation
6.3
Connecting the Power Supply
The ADS8638EVM-PDK requires multiple supplies to power the ADC to be used with the MMB0
motherboard. The ADS8638 requires two high-voltage supplies (
±
10 V to
±
15 V), HVDD and HVEE, along
with a +5-V supply to power the analog, AVDD, and +3.3 V to +5 V to power the digital circuitry, DVDD.
When the MMB0 DSP is powered properly, LED D2 glows green. The green light indicates that the 3.3-V
supply for the MMB0 is operating properly. (It does not indicate that the EVM power supplies are
operating properly.)
6.3.1
Connecting the Laboratory Power Supply
A laboratory power supply can be connected through terminal block J14 on the MMB0, as shown in
. To use a unipolar lab power supply configuration, follow these procedures:
•
Disconnect J12 on the MMB0.
•
Connect a +5-V dc supply to the +5 VD terminal on J14.
•
Connect ground of the dc supply to the GND terminal on J14.
For bipolar mode, also connect a
–
10-V dc supply to the
–
VA, and +10 V on the +VA terminals on J14.
It is not necessary to connect a +5-V dc supply voltage to the +5 VA terminal on J14 if the +5 V/+5 VA
position on J13 is shorted.
Figure 6. Laboratory Power-Supply Connections
11
SBAU192
–
July 2011
ADS8638EVM-PDK
Copyright
©
2011, Texas Instruments Incorporated
