Datasheet

Evaluation Board User Guide UG-257
Rev. 0 | Page 3 of 20
EVALUATION BOARD HARDWARE
POWER SUPPLIES
There are several power supply options on the AD7195
evaluation board.
Connected to USB Connector
When the USB connector is used, the AD7195 evaluation board
can be powered as follows:
• The AD7195 evaluation board is powered via the 5 V
supply from the USB connector, J51. This 5 V supply
can be used to power the AD7195 directly. Link J1
should be placed in Position 5 V USB.
• The 5 V supply from the USB connector can be regulated
to 3.3 V using the on-board ADP3303-3, a high precision,
low power, 3.3 V output voltage regulator. Using Link J1,
the 3.3 V regulator can be used as the power supply to the
AD7195. Link J1 should be placed in Position 3.3 V.
• The AD7195 can be powered using a 9 V battery (B1) or
using an external 9 V dc source connected at J31. The 9 V
is regulated down to 5 V using the on-board ADP3303-5,
a high precision, low power, 5 V output regulator. Using
Link J1, this regulated 5 V can be used as the supply to the
AD7195. To use this option, Link J1 should be placed in
Pos ition 5 V BAT.
• An external power supply can be applied via J10. Link J1
should be placed in Position EXT.
Standalone Operation
When standalone operation is used, the AD7195 evaluation
board can be powered as follows:
• The AD7195 evaluation board can be powered using a 9 V
battery (B1) or using an external 9 V dc source connected
at J31. The 9 V source is regulated down to 5 V using the
on-board ADP3303-5, a high precision, low power 5 V
output regulator. Using Link J1, this regulated 5 V can be
used as the supply to the AD7195. To use this option,
Link J1 should be placed in Position 5 V BAT.
• An external power supply can be applied via J10. Link J1
should be placed in Position EXT.
SOCKETS
There are five sockets relevant to the operation of the AD7195
on this evaluation board. The functions of these sockets are
outlined in Table 1.
Table 1. Socket Functions
Socket Description
REF+ Subminiature BNC (SMB) connector. This socket is used in conjunction with REF− to apply an external reference to the AD7195.
The voltage for the REFIN(+) input of the AD7195 is applied to this socket.
REF− Subminiature BNC (SMB) connector. This socket is used in conjunction with REF+ to apply an external reference to the AD7195.
The voltage for the REFIN(−) input of the AD7195 is applied to this socket.
AIN1 Subminiature BNC (SMB) connector. This socket is used to apply an analog input signal to AIN1.
AIN2 Subminiature BNC (SMB) connector. This socket is used to apply an analog input signal to AIN2.
MCLK Subminiature BNC (SMB) connector. An external clock source can be applied to the AD7195 using this socket.