EVAL-AD7992_15 Datasheet, PDF (4/12 Pages) Analog Devices – Evaluation Board for the 2-Channel, 12-Bit ADC with I2C-Compatible Interface

EVAL-AD7992
LINK OPTIONS
Eight link options can be set to change the configuration of the circuits. The functions of these link options are summarized in Table 2.
The positions of the links can be changed when the evaluation board is connected to the power supply.
Table 2.
Link No.
LK1
LK2, LK5
LK3, LK6
LK4
LK7
LK8
Function
LK1 connects the input of VIN1 to the AN0 input socket, to a digital potentiometer, or to a temperature sensor.
In Position A, VIN1 is connected to the digital potentiometer.
In Position B, VIN1 is connected to the AN0 input socket.
In Position C, VIN1 is connected to the temperature sensor.
LK2 and LK5 connect the power supply pins of the operational amplifiers to 3.6 V regulated output from the on-board
ADP3330 voltage regulators, or to 5 V supply from J1.
In Position A, an operational amplifier is supplied from J1.
In Position B, an operational amplifier is supplied from ADP3330.
LK3 and LK6 tie the operational amplifiers to the analog inputs of the AD7992.
In Position A, the operational amplifier is used.
In Position B, the operational amplifier is not used.
LK4 connects the input of VIN2 to the AN1 input socket, to a digital potentiometer or to a high precision reference voltage.
In Position A, VIN2 is connected to a digital potentiometer.
In Position B, VIN2 is connected to the AN1 input socket.
In Position C, Channel 2 is used as external reference input for the AD7992.
LK7 selects the power source for VDD on the AD7992.
In Position A, LK7 selects the 5 V supply from the USB connector.
In Position B, LK7 selects the 3.3 V regulated output from the on-board ADP3303 voltage regulator.
LK8 changes the value of the external reference voltage.
If a link is inserted, the reference voltage is 3 V.
If a link is not inserted, the reference voltage is 2.5 V.
SOCKETS
There are four input sockets relevant to the operation of the
AD7992 on this evaluation board. The functions of these
sockets are outlined in Table 3.
Table 3. Socket Functions
Socket Function
AN0
Subminiature BNC (SMB) Connector. The analog input
signal for the VIN1 of the AD7992 is applied to this socket.
AN1
Subminiature BNC (SMB) Connector. The analog input
signal for the VIN2 of the AD7992 is applied to this socket.
J2
Subminiature BNC (SMB) Connector. This socket is
connected to the SDA track on the evaluation board.
J3
Subminiature BNC (SMB) Connector. This socket is
connected to the SCL track on the evaluation board.
USB CONNECTOR
A standard USB connector, J1, is used to connect the evaluation
board to the USB port of a PC. A standard USB connector cable
is included with the AD7992 evaluation board kit. Because the
USB connector powers the board, there is no need for an external
power supply.
Communication between the AD7992 evaluation board and
the PC is over the USB interface. The on-board USB controller
controls this communication.
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