Datasheet

Evaluation Board User Guide UG-280
Rev. 0 | Page 3 of 20
EVALUATION BOARD HARDWARE
POWER SUPPLIES
There are several power supply options on the AD7191
evaluation board.
Connected to USB Connector
The AD7191 evaluation board is powered via the 5 V supply
from the USB connector, J51. This 5 V supply can be used to
power the AD7191 directly. Link J1 should be placed in the 5 V
USB position.
The 5 V supply from the USB connector can be regulated to
3.3 V using the on-board ADP3303-3.3, a high precision, low
power, 3.3 V output voltage regulator. Therefore, via Link J1, the
3.3 V can be used as the power supply to the AD7191. Link J1
should be placed in the 3.3 V position.
The AD7191 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 ADP3303ARZ-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 AD7191. To use
this option, Link J1 should be placed in the 5 V BAT position.
An external power supply can be applied via J10. Place Link J1
in Position EXT.
Standalone Operation
The AD7191 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 is regulated down to 5 V using the on-board
ADP3303ARZ-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 AD7191. To use this option, place Link J1 in the
5 V BAT position.
An external power supply can be applied via J10. Place Link J1
in Position EXT.
SOCKETS
There are five sockets relevant to the operation of the AD7191
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 AD7191.
The voltage for the REFIN(+) input of the AD7191 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 AD7191.
The voltage for the REFIN(−) input of the AD7191 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 AD7191 using this socket.