EVAL-AD5933EBZ Datasheet, PDF (4/32 Pages) Analog Devices – Evaluation Board for the 1 MSPS 12-Bit Impedance Converter Network Analyzer

EVAL-AD5933EB
Preliminary Technical Data
Link No.
LK4
LK5
LK6
LK7
LK8
LK9
LK10
Function
The internal reference circuitry section of the AD5933 can be powered through Terminal Block J4-1 (AVDD-REF) or, alternatively,
from the on-board reference (U4). The J4-1 terminal block can be connected to a user-supplied external voltage source or,
alternatively, the on-board high performance voltage reference, ADR423 (U4), can act as the voltage supply to the AVDD2 pin
of the AD5933. Ensure that Link 4 is removed if Terminal Block J4-1 is powered with an external power supply.
• When Link 4 is inserted, the output of the ADR423 regulator (U4) is connected to the analog voltage supply pin of the
AD5933 (Pin 11).
• When Link 4 is removed, the output of the ADR423 regulator (U4) is disconnected from the analog voltage supply pin of
the AD5933 (Pin 11). In this case, the AVDD-REF pin must have an external supply voltage applied to J4-1 to power the
internal reference circuitry of the part.
Therefore, the user can either derive the AD5933 AVDD2 supply from the on-board reference or supply an external voltage
through Terminal Block J4-1 (AVDD-REF).
The analog circuitry section of the AD5933 can be powered through Terminal Block J5-1 (AVDD-SIG) or, alternatively, from the
on-board reference (U4). The terminal block (J5-1) can be connected to a user-supplied external voltage source or,
alternatively, the on-board high performance voltage reference, ADR423 (U4), can act as the voltage supply to the AVDD1 pin
of the AD5933. Ensure that Link 5 is removed if the Terminal Block J5-1 is powered with an external power supply.
• When Link 5 is inserted, the output of the ADR423 regulator (U4) is connected to the analog voltage supply pin of the
AD5933 (Pin 10).
• When Link 5 is removed, the output of the ADR423 regulator (U4) is disconnected from the analog voltage supply pin of
the AD5933 (Pin 10). In this case, the VDD-SIG pin must have an external supply voltage applied to J5-1 to power the
analog circuitry of the part.
Therefore, the user can either derive the AD5933 AVDD1 supply from the on-board reference or supply an external voltage
through Terminal Block J5-1 (AVDD-SIG).
This link is used in conjunction with Link 1 and Link 2. The output excitation voltage can be directly applied to the VOUT SMB
connector by inserting Link 6 and removing both Link 1 and Link 2. The AD5933 output excitation voltage can be postamplified by
routing the signal through a noninverting amplifier (user supplied), which is accomplished by removing Link 6 and inserting
Link 1 and Link 2.
• When link 6 is inserted, the output of AD5933 is connected directly to the VOUT SMB connector. When this link is inserted,
Link 1 and Link 2 must be removed.
• When Link 6 is removed, the output of the AD5933 is not connected directly to the VOUT SMB connector; therefore, Link 1
and Link 2 must be inserted to complete the signal path. This is assuming that the user has inserted an operational
amplifier (user supplied).
This link is used to connect the VIN SMB connector to the inverting terminal of the transimpedance amplifier within the
AD5933. This link is required to complete the signal path and should be inserted while running a sweep.
• When Link 7 is inserted, the impedance being tested is connected to the inverting terminal of the transimpedance
amplifier in the AD5933. Link 7 must be inserted for a successful sweep to complete the signal path.
• When Link 7 is removed, the signal path is incomplete, preventing a successful sweep.
This link is an applications sweep test link and is used in conjunction with Link 9.
• When this link is inserted, one end of a 15 pF capacitor is connected to the VIN pin of the AD5933.
• This link should be removed when running a normal sweep with an impedance connected across the VOUT and VIN SMB
connectors.
This link is an applications sweep test link and is used in conjunction with Link 8.
• When this link is inserted, one end of a 15 pF capacitor is connected across the VOUT pin of the AD5933.
• This link should be removed when running a normal sweep with an impedance connected across the VOUT and VIN SMB
connectors.
The digital circuitry section of the AD5933 can be powered through Terminal Block J2-1 (DVDD-5V) or, alternatively, from the
output of the on-board reference (ADR423, U4). The terminal block must be connected to a user-supplied external voltage
source (and Link 10 must be removed) or, alternatively, the on-board high performance voltage reference, ADR423, can act as
the voltage supply to the DVDD pin of the AD5933.
• When Link 10 is inserted, the output of the ADR423 regulator (U4) is connected to the digital voltage supply pin of the
AD5933 (Pin 9).
• When Link 10 is removed, the output of the ADR423 regulator (U4) is disconnected from the analog voltage supply pin of
the AD5933 (Pin 9). In this case, the DVDD-5V pin must have an external supply voltage applied to J2-1 to power the
digital circuitry of the part.
Therefore, the user can either derive the AD5933 digital supply from the on-board reference or supply an external voltage
through Terminal Block J2-1 (DVDD-5V).
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