UG136 Rev.0.00
Page 4 of 12
Oct 24, 2017
ISL71010BM50EV1Z
2. Functional Description
2.
Functional Description
The ISL71010BM50EV1Z evaluation board provides a simple platform to demonstrate the features and evaluate the
performance of the ISL71010B50 voltage reference. It provides easy access to the pins of the ISL71010B50 IC. The
schematic, bill of materials, and top silkscreen for the board are shown on
pages 6
through
8
.
Figures 8
through
18
show performance data taken using the ISL71010BM50EV1Z evaluation board and basic lab
equipment.
The following sections explain how to use the evaluation board.
2.1
Basic Layout of the Evaluation Board
Refer to
Figure 3 on page 6
or the actual ISL71010BM50EV1Z evaluation board for the basic layout.
The schematic of the evaluation board is shown in
Figure 4 on page 6
. The ISL71010BM50EV1Z contains the
ISL71010B50 voltage reference (U1), input decoupling capacitors (C
1
, C
2
), a compensation capacitor (C
5
), and a
load capacitor (C
3
). Different resistor values can be applied at (R
2
) for testing of the voltage reference at different
loads. The R
2
resistor location accepts surface mount or through-hole style resistors.
The power supply leads attach to TP1 and TP2 (VIN, GND). The ISL71010B50 IC requires a DC supply in the
range of 7.0V to 30V for proper operation. The power supply should be capable of delivering 100mA of current.
The output is measured at test points TP3 and TP4 (VOUT, GND), and is best measured with a high precision voltmeter
(such as the Agilent 3458A 8 - 1/2 digit multimeter).
The R-C damper network (R
1
, C
4
) is populated and can be connected to the reference output by adding a shunt to
the R-C jumper (J1). The damper network improves stability by reducing transient load ringing with high value
(>0.47µF) load capacitance.
2.1.1
Components Parts List
2.2
Operating Range
The ISL71010B50 IC requires a V
IN
DC supply in the range of 7.0V to 30V for proper operation. The power
supply should be capable of delivering 100mA of current.
The ISL71010B50 IC V
OUT
can source 20mA of current and sink -10mA of current. For normal operation the R
2
load resistor should be selected to be ≥250Ω. Note: With V
OUT
shorted to ground the IC will limit the current to
≤75mA.
Table 1. Components Parts List
Reference Designator
Value
Description
C
1
10µF
Bypass capacitor
C
2
0.01µF
Bypass capacitor
C
3
0.1µF
Load capacitor
C
4
10µF
Damper capacitor
C
5
1nF
Compensation capacitor
R
1
2.21kΩ
Damper resistor
R
2
DNP
Optional load resistor
U1
ISL71010BMB50Z
SOIC 8 Ld package
J1
DNP
Damper jumper
