EVAL-ADP7158 Datasheet, PDF (4/8 Pages) Analog Devices – Evaluating the ADP7158 Ultralow Noise

UG-794
OUTPUT VOLTAGE MEASUREMENTS
VOLTAGE
SOURCE
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EVAL-ADP7158 User Guide
VOLTMETER
3.298871
+
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LOAD
Figure 3. Output Voltage Measurement Setup for the ADP7158CP-3.3EVALZ
Figure 3 shows the connections to a voltage source and a
voltmeter for basic output voltage accuracy measurements for
the ADP7158CP-3.3EVALZ. Use a resistor as the load for the
regulator. Ensure the resistor has a power rating that can handle
the power dissipated across it. An electronic load can also be used
as an alternative to using a resistor load. Ensure the voltage
source supplies enough current for the expected load levels.
The steps on how to connect the ADP7158CP-3.3EVALZ to a
voltage source and a voltmeter are as follows:
1. Connect the negative terminal of the voltage source to one
of the GND pins on the evaluation board.
2. Connect the positive terminal of the voltage source to the
VIN pin on the evaluation board.
3. Connect a load between the evaluation board VOUT pin
and one of the GND pins.
4. Connect the negative terminal of the voltmeter to one of
the GND pins on the evaluation board.
5. Connect the positive terminal of the voltmeter to the
evaluation board VOUT pin on the evaluation board.
When these steps are complete, turn on the voltage source. If
the JP1 jumper is inserted (connecting the EN pin to the VIN pin
for automatic startup), the regulator powers up.
If the load current is large, connect the voltmeter as close as
possible to the output capacitor to reduce the effects of
voltage drops.
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