APPLICATION NOTE
ISL71090SEH12EV1Z, ISL71090SEH25EV1Z,
ISL71090SEH50EV1Z, ISL71090SEH75EV1Z
Evaluation Board
AN1847
Rev.2.00
Aug 15, 2015
Introduction
The ISL71090SEHXXEV1Z evaluation boards are designed to
measure the performance of the radiation hardened ultra low
noise, high precision
ISL71090SEH
voltage reference family.
The reference has a wide input voltage range from 4V to 30V
and an initial accuracy of 0.05%. Its ultra low voltage noise
(1µV
P-P
in the 0.1Hz to 10Hz range - ISL71090SEH12); a
maximum output voltage temperature coefficient of 10ppm/°C
and excellent radiation performance make the ISL71090SEH
ideal for space applications.
Each output voltage option of the ISL71090SEH has its own
evaluation board. Use the ordering number listed in
Table 1
to
order the evaluation boards with the desired output voltage
option.
ISL71090SEHXXEV1Z
Evaluation Boards
The schematic of the evaluation board is shown in
Figure 5.
The ISL71090SEHXXEV1Zs contain the ISL71090SEH voltage
reference (U1), input decoupling capacitors (C
1
), a
compensation capacitor (C
2
), and a load capacitor (C
4
).
The power supply leads attach to TP1 and TP2 (VIN, GND). The
output is measured at test points TP8 and TP9 (VOUT, GND),
and is best measured with a high quality voltmeter. In addition,
there is a BNC connector on VOUT to measure noise. The SP1
(VIN), SP2 (GND, and SP3 (VOUT) are scope probe test points
for easy connection to an oscilloscope.
TRIM 1-3
These pins are for trimming purpose and for factory use only. Do
not connect these to the circuit in any way. It will adversely effect
the performance of the reference.
TABLE 2. COMPONENTS PARTS LIST
REFERENCE
BNC1
C
1
C
2
0.1µF
1nF
DNP
1µF (0.1µF for
ISL71090SEH12)
Load capacitor
0805, X7R, 50V, 10%
Scope probe test point PCB mount
1514-2 test point turret
ISL71090SEHXX
Radiation hardened ultra low
noise, precision voltage reference
VALUE
DESCRIPTION
50Ω PCB mount receptacle
Bypass capacitor
0805, X7R, 50V, 10%
Compensation capacitor
0805, X7R, 100V, 10%
Reference Documents
•
ISL71090SEH12
datasheet
•
ISL71090SEH25
datasheet
•
ISL71090SEH50
datasheet
•
ISL71090SEH75
datasheet
TABLE 1. ORDERING INFORMATION
ORDERING NUMBER
ISL71090SEH12EV1Z
ISL71090SEH25EV1Z
ISL71090SEH50EV1Z
ISL71090SEH75EV1Z
OUTPUT VOLTAGE
(V)
1.25
2.5
5.0
7.5
TYPE
Evaluation Board
Evaluation Board
Evaluation Board
Evaluation Board
C
3
C
4
SP1 - SP3
TP1 - TP9
U1
FIGURE 1. VOLTAGE REFERENCE EVALUATION BOARD
AN1847 Rev.2.00
Aug 15, 2015
Page 1 of 4
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