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ADR366AUJZ-R2 View Datasheet(PDF) - Analog Devices

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ADR366AUJZ-R2 Datasheet PDF : 20 Pages
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ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
APPLICATIONS INFORMATION
BASIC VOLTAGE REFERENCE CONNECTION
The circuit in Figure 33 illustrates the basic configuration for
the ADR36x family. Decoupling capacitors are not required for
circuit stability. The ADR36x family is capable of driving
capacitive loads from 0 μF to 10 μF. However, a 0.1 μF ceramic
output capacitor is recommended to absorb and deliver the
charge, as is required by a dynamic load.
1 NC
TRIM 5
ADR36x
2 GND
INPUT
0.1µF
3 VIN
VOUT 4
OUTPUT
0.1µF
Figure 33. Basic Configuration for the ADR36x Family
Stacking Reference ICs for Arbitrary Outputs
Some applications require two reference voltage sources, which
are a combined sum of standard outputs. Figure 34 shows how
this stacked output reference can be implemented.
VIN
C2
0.1µF
1 NC
TRIM 5
ADR36x
2 GND
3 VIN
VOUT 4
VOUT2
Two reference ICs are used and fed from an unregulated input,
VIN. The outputs of the individual ICs are connected in series,
which provides two output voltages, VOUT1 and VOUT2. VOUT1 is
the terminal voltage of U1, and VOUT2 is the sum of this voltage
and the terminal voltage of U2. U1 and U2 are chosen for the
two voltages that supply the required outputs (see Table 10). For
example, if both U1 and U2 are ADR361s, VOUT1 is 2.5 V and
VOUT2 is 5.0 V.
Table 10. Output
U1/U2
ADR361/ADR365
ADR361/ADR361
ADR365/ADR361
VOUT1 (V)
2.5
2.5
5
VOUT2 (V)
7.5
5.0
7.5
Negative Precision Reference Without Precision
Resistors
A negative reference is easily generated by adding an op amp,
A1 (see Figure 35). VOUTF and VOUTS are at virtual ground and
therefore the negative reference can be taken directly from the
output of the op amp. The op amp must be dual-supply, low
offset, and rail-to-rail if the negative supply voltage is close to
the reference output.
+VDD
1 NC
TRIM 5
ADR36x
2 GND
3 VIN
VOUT 4
C1
0.1µF
1 NC
TRIM 5
ADR36x
2 GND
3 VIN
VOUT 4
VOUT1
Figure 34. Stacking Voltage References with the ADR36x
–VREF
A1
+
–VDD
Figure 35. Negative Reference
Rev. D | Page 17 of 20
 

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