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ADR360 Datasheet(PDF) 18 Page - Analog Devices

No. de pieza ADR360
Descripción Electrónicos  Low Power, Low Noise Voltage References with Sink/Source Capability
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ADR360 Datasheet(HTML) 18 Page - Analog Devices

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ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 18 of 20
General-Purpose Current Source
Many times in low power applications, the need arises for a
precision current source that can operate on low supply
voltages. The ADR36x can be configured as a precision current
source (see Figure 36). The circuit configuration illustrated is a
floating current source with a grounded load. The reference’s
output voltage is bootstrapped across RSET, which sets the output
current into the load. With this configuration, circuit precision
is maintained for load currents ranging from the reference’s
supply current, typically 150 μA, to approximately 5 mA.
NC
GND
VIN
ADR36x
TRIM
VOUT
1
2
3
5
4
ISY
ISET + ISY
ISET
R1
P1
+VDD
RL
RSET
Figure 36. Precision Current Source
Trim Terminal
The ADR36x trim terminal can be used to adjust the output
voltage over a nominal voltage. This feature allows a system
designer to trim system errors by setting the reference to a
voltage other than the standard voltage option. Resistor R1 is
used for fine adjustment and can be omitted if desired. The
resistor values should be carefully chosen to ensure that the
maximum current drive of the part is not exceeded.
1
2
3
5
4
+VDD
NC
GND
VIN
ADR36x
TRIM
VOUT
VOUT
R1
100k
Ω
POT
10k
Ω
R2
1k
Ω
Figure 37. ADR36x Trim Configuration


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