an1847

Application Note 1847
ISL71090SEH12EV1Z, ISL71090SEH25EV1Z,
ISL71090SEH50EV1Z, ISL71090SEH75EV1Z User Guide
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
(1µVP-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.
Reference Documents
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 (C1), a
compensation capacitor (C2), and a load capacitor (C4).
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
• ISL71090SEH12 datasheet
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.
• ISL71090SEH25 datasheet
TABLE 2. COMPONENTS PARTS LIST
REFERENCE
• ISL71090SEH50 datasheet
• ISL71090SEH75 datasheet
TABLE 1. ORDERING INFORMATION
ORDERING NUMBER
VALUE
BNC1
OUTPUT VOLTAGE
(V)
TYPE
ISL71090SEH12EV1Z
1.25
Evaluation Board
ISL71090SEH25EV1Z
2.5
Evaluation Board
ISL71090SEH50EV1Z
5.0
Evaluation Board
ISL71090SEH75EV1Z
7.5
Evaluation Board
C1
0.1µF
C2
1nF
C3
DNP
C4
1µF (0.1µF for
ISL71090SEH12)
SP1 - SP3
Bypass capacitor
0805, X7R, 50V, 10%
Compensation capacitor
0805, X7R, 100V, 10%
Load capacitor
0805, X7R, 50V, 10%
Scope probe test point PCB mount
TP1 - TP9
U1
DESCRIPTION
50Ω PCB mount receptacle
1514-2 test point turret
ISL71090SEHXX
Radiation hardened ultra low
noise, precision voltage reference
FIGURE 1. VOLTAGE REFERENCE EVALUATION BOARD
August 5, 2015
AN1847.2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2013, 2015. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Application Note 1847
Voltage Reference Evaluation Board Layout
FIGURE 3. BOTTOM LAYER
FIGURE 2. TOP LAYER
FIGURE 4. TOP SILKSCREEN
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is
cautioned to verify that the document is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
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3
1
2
TP3
TRIM2
7
3
6
6
5
5
4
4 SP2
3
2
7
VOUT
TP7
VOUT
TP8
TRIM
TP5
ISL7109XSEH
FIGURE 5. ISL71090SEHXXEV1Z SCHEMATIC
1
2
GND
4 SP3
3
1000PF
TP4
4
8
1UF
GND
3
8
1
OPEN
COMP
C2
TP2
0.1UF
C1
TP1
2
C3
1
VIN
1
2
TRIM3
C4
3
U1
GND
TP9
Application Note 1847
TP6
1
2
SP1 4
GND
5BNC1
3
4
TRIM1
VOUT
AN1847.2
August 5, 2015
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