Intersil ISL71010BM25EV1Z User manual

Rev.0.00 Nov 2017
User’s Manual
ISL71010BM25EV1Z
User’s Manual: Evaluation Board
High Reliability

UG135 Rev.0.00 Page 2 of 13
Nov 2, 2017
UG135
Rev.0.00
Nov 2, 2017
ISL71010BM25EV1Z
Evaluation Board
USER’S MANUAL
1. Overview
The ISL71010BM25EV1Z evaluation board measures the performance of the high precision 2.5V ISL71010B25
voltage reference. The reference has a wide input voltage range from 4V to 30V and an initial accuracy of ±0.05%. The
voltage noise of 1.9µVP-P in the 0.1Hz to 10Hz range and maximum output voltage temperature coefficient of 10ppm/°C
makes the ISL71010B25 ideal for high end applications.
The evaluation board includes voltage input test points (VIN and GND) for a power supply input, as well as a pair of
test points for the output (VOUT and GND). The resistor location designated as R2 and the capacitor location
designated as C3 allow VOUT output load testing. The R2 resistor location accepts surface mount or through-hole
style resistors and C3 comes populated with a 0.1µF load capacitor. Additionally, an R-C damper network can be
connected to VOUT by installing a jumper at J1.
1.1 Key Features
• Voltage input test points for power supply connection
• Convenient output test points to measure the voltage reference VOUT
• R2 and C3 allow for VOUT output load testing
• An additional R-C damper network can be connected at VOUT by installing a jumper at J1
1.2 Specifications
This evaluation board is configured and optimized for the following conditions:
• VIN = 4V to 30V
• 10µF and 0.1µF input decoupling capacitors, 1nF compensation capacitor, and 0.1µF load capacitor
• R2 load resistance of ≥ 125Ω
• Selectable 10µF and 2.21kΩ damper network at the output by installing a jumper at J1
• Board temperature: +25°C
1.3 Ordering Information
1.4 Related Literature
For a full list of related documents, visit our website:
•ISL71010B25 product page
Part Number Output Voltage (V) Description
ISL71010BM25EV1Z 2.5V Evaluation board

UG135 Rev.0.00 Page 3 of 13
Nov 2, 2017
ISL71010BM25EV1Z 1. Overview
Figure 1. ISL71010BM25EV1Z Block Diagram
10µF 0.1µF
Chip Select
Serial Clock
Serial Data I/O
VDD VREF
SCLK
SDIO
CSb
OUTxS
GND
DACOUTx
VIN
VREF
0.1µF
OUTxF
DAC
1
2
3
4
DNC
GND
VOUT
TRIM
6
8
7
5
DNC
DNC
COMP
VIN

UG135 Rev.0.00 Page 4 of 13
Nov 2, 2017
ISL71010BM25EV1Z 2. Functional Description
2. Functional Description
The ISL71010BM25EV1Z evaluation board provides a simple platform to demonstrate the features and evaluate the
performance of the ISL71010B25 voltage reference. It provides easy access to the ISL710101B25 IC pins. The
schematic, bill of materials, and top silkscreen for the board are available on pages 6 through 8.
Figures 8 through 18 show performance data taken using the ISL71010BM25EV1Z evaluation board and basic lab
equipment.
The following sections explain how to use the evaluation board.
2.1 Basic Layout of the Evaluation Board
Figure 3 on page 6 shows the basic layout of the evaluation board.
Figure 4 shows the evaluation board schematic. The ISL71010BM25EV1Z contains the ISL71010BMB25Z
voltage reference (U1), input decoupling capacitors (C1, C2), a compensation capacitor (C5), and a load capacitor
(C3). Different resistor values can be applied at (R2) for testing of the voltage reference at different loads. The R2
resistor location accepts surface mount or through-hole style resistors.
The power supply leads attach to TP1 and TP2 (VIN, GND). The ISL71010B25 IC requires a DC supply in the
range of 4.0V 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 Keysight 3458A digital multimeter, 8 1/2 digits.
The R-C damper network (R1, C4) 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.
2.2 Operating Range
The ISL71010B25 IC requires a VIN DC supply in the range of 4.0V to 30V for proper operation. The power
supply should be capable of delivering 100mA of current.
The ISL71010B25 IC VOUT can source 20mA of current and sink -10mA of current. For normal operation, the R2
load resistor should be selected to be ≥125Ω.
Note: With VOUT shorted to ground, the IC will limit the current to ≤75mA.
Table 1. Board Components List
Designator Value Description
C1 10µF Bypass Capacitor
C2 0.01µF Bypass Capacitor
C3 0.1µF Load Capacitor
C4 10µF Damper Capacitor
C5 1nF Compensation Capacitor
R1 2.21kΩ Damper Resistor
R2 DNP Optional Load Resistor
U1 ISL71010BMB25Z SOIC 8-Pin Package
J1 DNP Damper Jumper

UG135 Rev.0.00 Page 5 of 13
Nov 2, 2017
ISL71010BM25EV1Z 2. Functional Description
2.3 Quick Start Guide
(1) Gather the external supply and equipment needed to operate the board:
(a) 4V to 30V DC power supply
(b) Precision Voltmeter (Agilent 3458A digital multimeter or equivalent)
(2) Attach the evaluation board to a DC power supply at test points TP1 and TP2 labeled VIN and GND as shown
in Figure 2. Place the positive terminal at VIN (TP1) and the negative terminal at GND. The supply should be
capable of delivering 4V to 30V of power and 100mA of current.
(3) Connect a precision voltmeter at test points TP3 and TP4 labeled VOUT and GND as shown in Figure 2.
(4) Set the supply voltage to 5V.
(5) Turn the DC power supply ON. The voltmeter should read 2.5V ± 0.05%.
(6) Change the DC power supply voltage to 10V. The voltmeter should continue to read 2.5V.
(7) Vary the DC power supply voltage over the range of 4V to 30V. The voltmeter should continue to read 2.5V.
(8) Performance at different resistive loads can be evaluated by changing R2 with different resistor values.
Figure 2. Basic Evaluation Test Setup Block Diagram (Measuring Voltage Reference VOUT)
4V to 30V
DC POWER SUPPLY
ISL71010BM25EV1ZEVAL1Z
-
+
C4
C3
TP1
R1
R2
VIN
VOUT
LOAD TP4
GND
GND
TP2
TP3
C1
U1
Precision
Voltmeter
C2
C5
REV A
+-

UG135 Rev.0.00 Page 6 of 13
Nov 2, 2017
ISL71010BM25EV1Z 3. PCB Layout Guidelines
3. PCB Layout Guidelines
3.1 ISL71010BM25EV1Z Evaluation Board
3.2 ISL71010BM25EV1Z Evaluation Board Schematic
Figure 3. ISL71010BM25EV1Z Evaluation Board
Figure 4. ISL71010BM25EV1Z Evaluation Board Schematic
GND
RC
GND
LOAD
VIN VOUT
7
10µF
C2
0.1µF
R2
DNP
TP3
0.1µF
SOIC8
1000pF
U1
2
3
4
6
TP1
C1
C3
C5
P1
P2
5
1
TP4
2.21kΩ
2
R1
J1
C4
10µF
8
1
TP2
5
6
7
8
3
4
1
2

UG135 Rev.0.00 Page 7 of 13
Nov 2, 2017
ISL71010BM25EV1Z 3. PCB Layout Guidelines
3.3 Bill of Materials
3.4 Board Layout
Qty
Reference
Designator Description Mfr
Manufacturer
Part Number
1 - PWB-PCB, ISL71010BM25EV1Z, Rev A, ROHS IMAGINEERING
INC
ISL71010BM25EV1ZREVAPCB
1 C5 CAP, SMD, 0805, 1000pF, 50V, 10%, X7R, ROHS PANASONIC ECJ-2VB1H102K
2 C2,C3 CAP, SMD, 0805, 0.1µF, 50V, 10%, X7R, ROHS KEMET C0805C104K5RACTU
2 C1,C4 CAP, SMD, 1210, 10µF, 50V, 10%, X5R, ROHS TAIYO YUDEN UMK325BJ106KM-T
2 TP1, TP3 CONN - MINI TEST PT, VERTICAL, RED, ROHS KEYSTONE 5000
2 TP2, TP4 CONN - MINI TEST PT, VERTICAL, BLK, ROHS KEYSTONE 5001
1 J1 CONN-HEADER, 1X2, RETENTIVE, 2.54mm, 0.230X0.120,
ROHS
BERG/FCI 69190-202HFL
1 U1 IC - PREC. VOLTAGE REFERENCE, 8P, SOIC, 2.5VOUT,
ROHS
INTERSIL ISL71010BMB25Z-TK
1 R2 RESISTOR, SMD, 0805, DNP - -
1 R1 RESISTOR, SMD, 0805, 2.21KΩ, 1/8W, 1%, TF, ROHS YAGEO RC0805FR-072K21L
1 Place assy in
bag
BAG, STATIC, 2X3, ZIP LOC - 2X3-STATIC-BAG
1 - LABEL-DATE CODE_LINE 1: YRWK/REV#, LINE 2: BOM
NAME
INTERSIL LABEL-DATE CODE
Figure 5. Top Layer Figure 6. Bottom Layer

UG135 Rev.0.00 Page 8 of 13
Nov 2, 2017
ISL71010BM25EV1Z 3. PCB Layout Guidelines
Figure 7. Top Layer Silk Screen

UG135 Rev.0.00 Page 9 of 13
Nov 2, 2017
ISL71010BM25EV1Z 4. Typical Performance Curves
4. Typical Performance Curves
Recommended operation conditions, unless noted: VIN = 5V, IOUT = 0mA, COUT = 0.1µF, COMP = 1nF, TA = +25°C
Figure 8. VOUT vs Temperature, Five Units Figure 9. VOUT Accuracy Over Temperature
Figure 10. VOUT vs VIN at 0mA, 20mA, and -10mA
Figure 11. Line Regulation, Three Units Figure 12. Line Regulation, Three Temperatures
2.497
2.498
2.499
2.500
2.501
2.502
2.503
-55 -5 45 95 145
Temperature (°C)
2.5V -0.1%
2.5V +0.1%
VOUT (V)
Unit1
Unit5 Unit2
Unit3
Unit4
2.497
2.498
2.499
2.500
2.501
2.502
2.503
0 5 101520253035
VOUT (V)
VIN (V)
VOUT (V) 0mA +25°C
2.5V-0.1%
2.5V+0.1%
VOUT (V) 0mA +125°C
VOUT (V) 0mA -55°C
2.497
2.498
2.499
2.500
2.501
2.502
2.503
0 5 10 15 20 25 30 35
VIN (V)
VOUT (V)
VOUT (V) 0mA +25°C
VOUT (V) 20mA +25°C
VOUT (V) -10mA +25°C
2.5V-0.1%
2.5V+0.1%
VOUT (V) 0mA +125°C
VOUT (V) 20mA +125°C
VOUT (V) -10mA +125°C
VOUT (V) 0mA -55°C
VOUT (V) 20mA -55°C
VOUT (V) -10mA -55°C
2.499690
2.499790
2.499890
2.499990
2.500090
2.500190
2.500290
2.500390
3 6 9 12151821242730333639
VIN (V)
Unit 1
Unit 2 Unit 3
VOUT (V)
2.498800
2.499000
2.499200
2.499400
2.499600
2.499800
2.500000
4 9 14 19 24 29 34 39
2.500200
+25°C
-40°C
+125°C
VIN (V)
VOUT (V)
2.498800
2.499000
2.499200
2.499400
2.499600
2.499800
2.500000
4 9 14 19 24 29 34 39
2.500200
+25°C
-40°C
+125°C
VIN (V)
VOUT (V)

UG135 Rev.0.00 Page 10 of 13
Nov 2, 2017
ISL71010BM25EV1Z 4. Typical Performance Curves
Figure 13. IIN vs VIN, Three Units Figure 14. IIN vs VIN, Three Temperatures
Figure 15. Turn-On Time with 0.1µF Figure 16. Turn-On Time with 1µF
Figure 17. Short-Circuit to GND Figure 18. Short-Circuit to VIN
Recommended operation conditions, unless noted: VIN = 5V, IOUT = 0mA, COUT = 0.1µF, COMP = 1nF, TA = +25°C (Continued)
880
900
920
940
960
980
1000
4 9 14 19 24 29 34 39
I
IN
(µA)
VIN (V)
Unit 1
Unit 2
Unit 3
600
700
800
900
1000
1100
1200
1300
4 9 14 19 24 29 34 39
I
IN
(µA)
VIN (V)
+25°C
-40°C
+125°C
-1
0
1
2
3
4
5
6
0 50 100 150 200 250 300 350 400
Time (µs)
VOUT (V)
CL = 0.1µF
VIN
-1
0
1
2
3
4
5
6
0 50 100 150 200 250 300 350 400
Time (µs)
VOUT (V)
CL = 1µF
VIN
-65
-60
-55
-50
-45
-40
-35
-30
3 8 13 18 23 28 33 38
VIN (V)
Current (mA)
+125°C
+25°C
-40°C
30
40
50
60
70
80
90
3 8 13 18 23 28 33 38
VIN (V)
Current (mA)
+125°C
+25°C
-40°C