EVAL-AD7998_15 Datasheet, PDF (5/12 Pages) Analog Devices – Evaluation Board for the 8-Channel, 10-/12-Bit ADC with I2C-Compatible Interface

EVAL-AD7997EBZ/AD7998EBZ
Table 3. Link Options
Link No.
LK1, LK4, LK12, LK18, LK21,
LK24, LK27
LK2, LK5, LK11, LK14, LK17,
LK20, LK23, LK26
LK3, LK6 , K10, LK13, LK16,
LK19, LK22, LK25
LK7
LK8
LK9
LK15
Function
These links connect the input of VIN1 through VIN8 to the corresponding AN0 through AN7 socket, where
VIN1 connects to AN0 and so on. Alternatively, these links connect to an input socket or to a digital
potentiometer.
In Position A, VINX is connected to the digital potentiometer.
In Position B, VINX is connected to the ANx input socket.
These links 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 the ADP3330.
These links tie the operational amplifiers to the analog inputs of the AD7997/AD7998.
In Position A, the operational amplifier is used.
In Position B, the operational amplifier is not used.
LK7 selects the power source for VDD on the AD7997/AD7998.
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 (AD780).
If this link is inserted, the reference voltage is 3 V.
If this link is not inserted, the reference voltage is 2.5 V.
LK9 changes the source of the reference voltage for the AD7997/AD7998.
In Position A, an external reference source is used (AD780).
In Position B, the 5 V supply from J1 is used as a reference voltage.
LK15 connects the input of VIN4 to the AN3 input socket, to a digital potentiometer or to a temperature
sensor.
In Position A, VIN4 is connected to digital Potentiometer 2.
In Position B, VIN4 is connected to the AN3 input socket.
In Position C, VIN4 is connected to the temperature sensor.
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