FN6993 Rev 5.00 Page 1 of 20
February 27, 2013
FN6993
Rev 5.00
February 27, 2013
ISL21090
Ultra Low Noise, Precision Voltage Reference
DATASHEET
The ISL21090 is a ultra low noise, high DC accuracy precision
voltage reference with wide input voltage range. The ISL21090
uses the new Intersil Advanced Bipolar technology to achieve
sub 1.0µVP-P (1.25V option) 0.1Hz to 10Hz noise with an initial
voltage accuracy of 0.02% (2.5V option).
The ISL21090 offers 1.25V, 2.5V, 5.0V and 7.5V output voltage
options with 7ppm/°C temperature coefficient and also
provides excellent line and load regulation. These devices are
offered in an 8 Ld SOIC package.
The ISL21090 is ideal for high-end instrumentation, data
acquisition and processing applications requiring high DC
precision where low noise performance is critical.
Applications
• High-end instrumentation
• Precision voltage sources for data acquisition system,
industrial control, communication infrastructure
• Process control and instrumentations
• Active source for sensors
Features
• Reference output voltage option
- 1.25V, 2.5V, 5.0V and 7.5V
• Initial accuracy:
- ISL21090-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±0.03%
- ISL21090-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±0.02%
- ISL21090-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±0.025%
- ISL21090-75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±0.035%
• Output voltage noise (0.1Hz to 10Hz) . . . . . . . . . . . . 1.0µVP-P typ
(1.25V option)
• Supply current . . . . . . . . . . . . . . . . . . . . 750µA (1.25V option)
• Temperature coefficient . . . . . . . . . . . . . . . . . . 7ppm/°C max
• Output current capability . . . . . . . . . . . . . . . . . . . . . . . . 20mA
• Line regulation . . . . . . . . . . . . . . . . . . .6ppm/V (1.25V option)
• Load regulation . . . . . . . . . . . . . . 2.5ppm/mA (1.25V option)
• Operating temperature range. . . . . . . . . . . .-40°C to +125°C
Related Literature
See AN1764, “ISL21090XXEV1Z User’s Guide”
FIGURE 1. ISL21090 TYPICAL APPLICATION DIAGRAM FIGURE 2. VOUT vs TEMPERATURE (2.5V OPTION)
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
2.4980
2.4985
2.4990
2.5000
2.5005
2.5010
-55 -35 -15 5 25 45 65 85 105 125 145
TEMPERATURE (°C)
TYPICAL TEMPERATURE
VOUT (V)
COEFFICIENT CURVE FOR 10 UNITS
2.4995
ISL21090
FN6993 Rev 5.00 Page 2 of 20
February 27, 2013
Pin Configuration
ISL21090
(8 LD SOIC)
TOP VIEW
1
2
3
4
DNC
GND
VOUT
TRIM
6
8
7
5
DNC
DNC
COMP
VIN
Pin Descriptions
PIN NUMBER PIN NAME DESCRIPTION
1, 7, 8 DNC Do Not Connect
2 VIN Input Voltage Connection
3 COMP Compensation and Noise Reduction Capacitor
4 GND Ground Connection
5 TRIM Voltage Reference Trim input
6 VOUT Voltage Reference Output
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
VOUT OPTION
(V)
GRADE
(%)
TEMPCO
(ppm/°C)
TEMP RANGE
(°C)
PACKAGE
TAPE & REEL
(Pb-Free)
PKG.
DWG. #
ISL21090BFB812Z-TK 21090 BFZ12 1.25 0.03 7 -40 to +125 8 Ld SOIC M8.15E
ISL21090BFB825Z-TK 21090 BFZ25 2.5 0.02 7 -40 to +125 8 Ld SOIC M8.15E
ISL21090BFB850Z-TK 21090 BFZ50 5.0 0.025 7 -40 to +125 8 Ld SOIC M8.15E
ISL21090BFB875Z-TK 21090 BFZ75 7.5 0.035 7 -40 to +125 8 Ld SOIC M8.15E
NOTES:
1. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL21090B12, ISL21090B25, ISL21090B50, ISL21090B75. For more
information on MSL please see Tech Brief TB363.
ISL21090
FN6993 Rev 5.00 Page 3 of 20
February 27, 2013
Absolute Maximum Ratings Thermal Information
Max Voltage
VIN to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +40V
VOUT to GND (10s). . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.5V to VOUT + 0.5V
Voltage on any Pin to Ground . . . . . . . . . . . . . . . . . . . -0.5V to +VOUT + 0.5V
Voltage on DNC pins . . . . . . . . . . . . . . . No connections permitted to these pins
Input Voltage Slew Rate (Max) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1V/µs
ESD Ratings
Human Body Model (Tested per JESD22-A114F) . . . . . . . . . . . . . . . . 3kV
Machine Model (Tested per JESD22-A115-C) . . . . . . . . . . . . . . . . . . 200V
Charged Device Model (Tested per JESD22-C110D) . . . . . . . . . . . . . 2kV
Latch-up (Tested per JESD-78B; Class 2, Level A) . . . . . . . . . . . . . . . at +125°C
Thermal Resistance (Typical) JA (°C/W) JC (°C/W)
8 Ld SOIC Package (Notes 4, 5) . . . . . . . . . 110 60
Continuous Power Dissipation (TA = +125°C) . . . . . . . . . . . . . . . . . 217mW
Maximum Junction Temperature (TJMAX). . . . . . . . . . . . . . . . . . . . . .+150°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Recommended Operating Conditions
Temperature Range (Industrial) . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
5. For JC, the “case temp” location is taken at the package top center.
6. Post-reflow drift for the ISL21090 devices can exceed 100µV to 1.0mV based on experimental results with devices on FR4 double sided boards. The
system engineer must take this into account when considering the reference voltage after assembly.
Electrical Specifications VIN = 5V (1.25V option), IOUT = 0, CL = 0.1µF and CC = 0.01µF, unless otherwise specified. Boldface limits apply
over the operating temperature range, -40°C to +125°C.
PARAMETER DESCRIPTION CONDITIONS
MIN
(Note 7) TYP
MAX
(Note 7) UNIT
VOUT Output Voltage VIN = 5V, 1.25 V
VOA VOUT Accuracy @ TA = +25°C (Note 6) VOUT = 1.25V -0.03 +0.03 %
TC VOUT Output Voltage Temperature Coefficient
(Note 8)
ISL21090 B grade 7ppm/°C
VIN Input Voltage Range VOUT = 1.25V 3.7 36 V
IIN Supply Current 0.750 1.28 mA
VOUT /VIN Line Regulation VIN = 3.7V to 36V, VOUT = 1.25V 6 17 ppm/V
VOUT/IOUT Load Regulation Sourcing: 0mA ≤ IOUT ≤ 20mA 2.5 17 ppm/mA
VDDropout Voltage (Note 9) VOUT = 1.25V @ 10mA 1.7 2.15 V
ISC+ Short Circuit Current TA = +25°C, VOUT tied to GND 53 mA
tRTurn-on Settling Time 90% of final value, CL = 1.0µF, CC= open 150 µs
Ripple Rejection f = 120Hz 90 dB
enp-p Voltage Noise 0.1Hz f 10Hz, VOUT = 1.25V 1.0 µVP-P
VnBroadband Voltage Noise 10Hz f 1kHz, VOUT = 1.25V 1.2 µVRMS
enNoise Voltage Density f = 1kHz, VOUT = 1.25V 25 nV/Hz
VOUT/t Long Term Stability TA = +25°C 20 ppm
ISL21090
FN6993 Rev 5.00 Page 4 of 20
February 27, 2013
Electrical Specifications VIN = 5V (2.5V option), IOUT = 0 unless otherwise specified. Boldface limits apply over the operating
temperature range, -40°C to +125°C.
PARAMETER DESCRIPTION CONDITIONS
MIN
(Note 7) TYP
MAX
(Note 7) UNIT
VOUT Output Voltage VIN = 5V 2.5 V
VOA VOUT Accuracy @ TA = +25°C All VOUT options -0.02 +0.02 %
TC VOUT Output Voltage Temperature Coefficient ISL21090 B grade 7ppm/°C
VIN Input Voltage Range VOUT = 2.5V 3.7 36 V
IIN Supply Current 0.930 1.28 mA
VOUT /VIN Line Regulation VIN = 3.7V to 36V, VOUT = 2.5V 8 18 ppm/V
VOUT/IOUT Load Regulation Sourcing: 0mA ≤ IOUT ≤ 20mA 2.5 17 ppm/mA
Sinking: -10mA ≤ IOUT ≤ 0mA 2.5 17 ppm/mA
VDDropout Voltage (Note 9) VOUT = 2.5V @ 10mA 1.1 1.7 V
ISC+ Short Circuit Current TA = +25°C, VOUT tied to GND 55 mA
ISC- Short Circuit Current TA = +25°C, VOUT tied to VIN -61 mA
tRTurn-on Settling Time 90% of final value, CL = 1.0µF, CC = open 150 µs
Ripple Rejection f = 120Hz 90 dB
enp-p Noise Voltage 0.1Hz f 10Hz, VOUT = 2.5V 1.9 µVP-P
VnBroadband Voltage Noise 10Hz f 1kHz, VOUT = 2.5V 1.6 µVRMS
enNoise Voltage Density f = 1kHz, VOUT = 2.5V 50 nV/Hz
VOUT/t Long Term Stability TA = +25°C 20 ppm
Electrical Specifications VIN = 10V (5.0V option), IOUT = 0 unless otherwise specified. Boldface limits apply over the operating
temperature range, -40°C to +125°C.
PARAMETER DESCRIPTION CONDITIONS
MIN
(Note 7) TYP
MAX
(Note 7) UNIT
VOUT Output Voltage VIN = 10V, 5.0 V
VOA VOUT Accuracy @ TA = +25°C (Note 6) VOUT = 5.0V 0.025 0.025 %
TC VOUT Output Voltage Temperature Coefficient
(Note 8)
ISL21090 B grade 7ppm/°C
VIN Input Voltage Range VOUT = 5.0V 736V
IIN Supply Current 0.930 1.33 mA
VOUT /VIN Line Regulation VIN = 7V to 36V, VOUT = 5.0V 8 18 ppm/V
VOUT/IOUT Load Regulation Sourcing: 0mA ≤ IOUT ≤ 20mA 2.5 17 ppm/mA
Sinking: -10mA ≤ IOUT ≤ 0mA 2.5 17 ppm/mA
VDDropout Voltage (Note 9) VOUT = 5.0V @ 10mA 1.1 1.7 V
ISC+ Short Circuit Current TA = +25°C, VOUT tied to GND 61 mA
ISC- Short Circuit Current TA = +25°C, VOUT tied to VIN -75 mA
tRTurn-on Settling Time 90% of final value, CL = 1.0µF, CC= open 150 µs
Ripple Rejection f = 120Hz 90 dB
enp-p Output Voltage Noise 0.1Hz f 10Hz, VOUT = 5.0V 4.2 µVP-P
VnBroadband Voltage Noise 10Hz f 1kHz, VOUT = 5.0V 3.2 µVRMS
enNoise Voltage Density f = 1kHz, VOUT = 5.0V 100 nV/Hz
VOUT/t Long Term Stability TA = +25°C 20 ppm
ISL21090
FN6993 Rev 5.00 Page 5 of 20
February 27, 2013
Electrical Specifications VIN = 15V (7.5V option), IOUT = 0 unless otherwise specified. Boldface limits apply over the operating
temperature range, -40°C to +125°C.
PARAMETER DESCRIPTION CONDITIONS
MIN
(Note 7) TYP
MAX
(Note 7) UNIT
VOUT Output Voltage VIN = 15V, 7.5 V
VOA VOUT Accuracy @ TA = +25°C (Note 6) VOUT = 7.5V 0.035 0.035 %
TC VOUT Output Voltage Temperature Coefficient
(Note 8)
ISL21090 B grade 7ppm/°C
VIN Input Voltage Range VOUT = 7.5V 936V
IIN Supply Current 0.940 1.30 mA
VOUT /VIN Line Regulation VIN = 9V to 36V, VOUT = 7.5V 2.3 18 ppm/V
VOUT/IOUT Load Regulation Sourcing: 0mA ≤ IOUT ≤ 20mA 2.5 17 ppm/mA
Sinking: -10mA ≤ IOUT ≤ 0mA 9 17 ppm/mA
VDDropout Voltage (Note 9) VOUT = 7.5V @ 10mA 1.06 1.8 V
ISC+ Short Circuit Current TA = +25°C, VOUT tied to GND 56 mA
ISC- Short Circuit Current TA = +25°C, VOUT tied to VIN -69 mA
tRTurn-on Settling Time 90% of final value, CL = 1.0µF, CC= open 150 µs
Ripple Rejection f = 120Hz 90 dB
enp-p Output Voltage Noise 0.1Hz f 10Hz, VOUT = 7.5V 6.2 µVP-P
VnBroadband Voltage Noise 10Hz f 1kHz, VOUT = 7.5V 4.8 µVRMS
enNoise Voltage Density f = 1kHz, VOUT = 7.5V 150 nV/Hz
VOUT/t Long Term Stability TA = +25°C 20 ppm
NOTES:
7. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
8. Over the specified temperature range. Temperature coefficient is measured by the box method whereby the change in VOUT is divided by the
temperature range; in this case, -40°C to +125°C = +165°C.
9. Dropout Voltage is the minimum VIN - VOUT differential voltage measured at the point where VOUT drops 1mV from VIN = nominal at TA = +25°C.
ISL21090
FN6993 Rev 5.00 Page 6 of 20
February 27, 2013
Typical Performance Curves (ISL21090-1.25V)
FIGURE 3. IIN vs VIN, THREE UNITS FIGURE 4. IIN vs VIN, THREE TEMPERATURES
FIGURE 5. LINE REGULATION, THREE UNITS FIGURE 6. LINE REGULATION, THREE TEMPERATURES
FIGURE 7. LINE TRANSIENT WITH 10nF LOAD (VIN = ±500mV) FIGURE 8. LINE TRANSIENT WITH 100nF LOAD (VIN = ±500mV)
550
600
650
700
750
800
850
900
3.7 8.7 13.7 18.7 23.7 28.7 33.7
IIN (µA)
VIN (V)
UNIT 3
UNIT 2
UNIT 1
400
500
600
700
800
900
1000
1100
1200
3.7 8.7 13.7 18.7 23.7 28.7 33.7
IIN (µA)
VIN (V)
+25°C
-40°C
+125°C
1.2496
1.2497
1.2498
1.2499
1.2500
1.2501
1.2502
1.2503
3.7 8.7 13.7 18.7 23.7 28.7 33.7 38.7
V
OUT
(V)
VIN (V)
UNIT 1
UNIT 2
UNIT 3
1.2494
1.2495
1.2496
1.2497
1.2498
1.2499
1.2500
1.2501
1.2502
1.2503
3.7 8.7 13.7 18.7 23.7 28.7 33.7
V
OUT
(V)
VIN (V)
+25°C
-40°C
+125°C
-4
-3
-2
-1
0
1
2
3
0 102030405060708090100
AMPLITUDE (mV)
TIME (µs)
CL = 10nF
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
0 102030405060708090100
AMPLITUDE (mV)
TIME (µs)
CL = 100nF
ISL21090
FN6993 Rev 5.00 Page 7 of 20
February 27, 2013
FIGURE 9. LOAD REGULATION, THREE TEMPERATURE FIGURE 10. LOAD TRANSIENT (ILOAD = ±1mA)
FIGURE 11. TURN ON TIME WITH 0.1µF FIGURE 12. TURN ON TIME WITH 1µF
FIGURE 13. ZOUT vs FREQUENCY (COMP = 0.01µF) FIGURE 14. PSRR AT DIFFERENT CAPACITIVE LOADS
Typical Performance Curves (ISL21090-1.25V) (Continued)
V
OUT
(PPM)
SOURCING ILOAD (mA)
-24
-16
-8
0
8
16
24
32
40
+25°C
-40°C
+125°C
-25 -20 -15 -10 -5 0
-30
-20
-10
0
10
20
30
0 200 400 600 800 1000 1200
TIME (µs)
100nF
1µF
AMPLITUDE (mV)
-1
0
1
2
3
4
5
6
0 50 100 150 200 250 300 350 400 450 500 550
TIME (µs)
CL = 0.1µF
VIN
VOUT (V)
-1
0
1
2
3
4
5
6
0 50 100 150 200 250 300 350 400 450 500 550
TIME (µs)
VOUT (V)
CL = 1µF
VIN
0.0001
0.001
0.01
0.1
1
10
100
10 100 1k 10k 100k 1M 10M
Z
OUT
(Ω)
FREQUENCY (Hz)
CL = 100nF
CL = 10µF
CL = 10nF
CL = 1nF
CL = 1µF
-120
-100
-80
-60
-40
-20
0
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
PSRR (dB)
100nF
1µF
ISL21090
FN6993 Rev 5.00 Page 8 of 20
February 27, 2013
FIGURE 15. SHORT CIRCUIT TO GND FIGURE 16. VOUT vs NOISE, 0.1Hz TO 10Hz
FIGURE 17. DROPOUT WITH -10mA LOAD
Typical Performance Curves (ISL21090-1.25V) (Continued)
-65
-60
-55
-50
-45
-40
-35
-30
3.7 8.7 13.7 18.7 23.7 28.7 33.7
VIN (V)
CURRENT (mA)
+125°C
+25°C
-40°C
X = 1s/DIV
Y = 0.5µV/DIV
1.2490
1.2492
1.2494
1.2496
1.2498
1.2500
1.2502
3.7 8.7 13.7 18.7 23.7 28.7 33.7
VIN (V)
VOUT (V)
+85°C
-40°C
+25°C
ISL21090
FN6993 Rev 5.00 Page 9 of 20
February 27, 2013
Typical Performance Curves (ISL21090-2.5)
FIGURE 18. IIN vs VIN, THREE UNITS FIGURE 19. IIN vs VIN, THREE TEMPERATURES
FIGURE 20. LINE REGULATION, THREE UNITS FIGURE 21. LINE REGULATION, THREE TEMPERATURES
FIGURE 22. LINE TRANSIENT WITH 1nF LOAD (VIN = ±500mV) FIGURE 23. LINE TRANSIENT WITH 100nF LOAD (VIN = ±500mV)
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
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)
-30
-20
-10
0
10
20
30
0 102030405060708090100
TIME (µs)
CL = 1nF
AMPLITUDE (mV)
-30
-20
-10
0
10
20
30
0 102030405060708090100
TIME (µs)
CL = 100nF
AMPLITUDE (mV)
ISL21090
FN6993 Rev 5.00 Page 10 of 20
February 27, 2013
FIGURE 24. LOAD REGULATION, THREE TEMPERATURES FIGURE 25. LOAD TRANSIENT (ILOAD = ±1mA)
FIGURE 26. TURN-ON TIME WITH 0.1µF FIGURE 27. TURN-ON TIME WITH 1µF
FIGURE 28. ZOUT vs FREQUENCY FIGURE 29. PSRR AT DIFFERENT CAPACITIVE LOADS
Typical Performance Curves (ISL21090-2.5) (Continued)
-16
-12
-8
-4
0
4
8
12
-25 -20 -15 -10 -5 0 5 10 15 20
(SOURCING) (SINKING)ILOAD (mA)
+25°C
-40°C
+125°C
VOUT (PPM)
-6
-4
-2
0
2
4
6
0 20406080100120
TIME (µs)
AMPLITUDE (mV)
CL = NO LOAD
CL = 100nF CL = 1µF
-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
0.01
0.1
1
10
100
1000
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
CL = NO LOAD
CL = 100nF
CL = 10nF
CL = 1nF
ZOUT ()
-140
-120
-100
-80
-60
-40
-20
0
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
PSRR (dB)
CL = NO LOAD
CL = 1nF
CL = 100nF
CL = 10nF
ISL21090
FN6993 Rev 5.00 Page 11 of 20
February 27, 2013
FIGURE 30. SHORT-CIRCUIT TO GND FIGURE 31. SHORT-CIRCUIT TO VIN
FIGURE 32. VOUT vs TEMPERATURE, 10 UNITS FIGURE 33. VOUT vs NOISE, 0.1Hz TO 10Hz
FIGURE 34. DROPOUT WITH -10mA LOAD FIGURE 35. LONG TERM STABILITY
Typical Performance Curves (ISL21090-2.5) (Continued)
-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
2.4980
2.4985
2.4990
2.5000
2.5005
2.5010
-55 -35 -15 5 25 45 65 85 105 125 145
TEMPERATURE (°C)
TYPICAL TEMPERATURE
VOUT (V)
COEFFICIENT CURVE FOR 10 UNITS
2.4995
X = 10s/DIV
Y = 1µV/DIV
2.4988
2.4990
2.4992
2.4994
2.4996
2.4998
2.5000
0 5 10 15 20 25 30 35 40
VIN (V)
VOUT (V)
+85°C
-40°C
+25°C
-30
-20
-10
0
10
20
30
40
50
0 500 1000 1500 2000 2500 3000
PPM
TIME (Hrs)
ISL21090
FN6993 Rev 5.00 Page 12 of 20
February 27, 2013
Typical Performance Curves (ISL21090-5.0)
FIGURE 36. IIN vs VIN, THREE UNITS FIGURE 37. IIN vs VIN, THREE TEMPERATURES
FIGURE 38. LINE REGULATION, THREE UNITS FIGURE 39. LINE REGULATION, THREE TEMPERATURES
FIGURE 40. LINE TRANSIENT WITH 1nF LOAD (VIN = ±500mV) FIGURE 41. LINE TRANSIENT WITH 100nF LOAD (VIN = ±500mV)
850
900
950
1000
1050
1100
1150
7 12 17 22 27 32 37
VIN (V)
IIN (µA)
UNIT 3
UNIT 2
UNIT 1
600
700
800
900
1000
1100
1200
1300
7 12 17 22 27 32 37
VIN (V)
IIN (µA)
+125°C
-40°C
+25°C
4.99970
4.99980
4.99990
5.00000
5.00010
5.00020
5.00030
5.00040
5.00050
5.00060
5.00070
7 12 17 22 27 32 37
VIN (V)
UNIT 3
UNIT 2
UNIT 1
VOUT (V)
4.99700
4.99750
4.99800
4.99850
4.99900
4.99950
5.00000
5.00050
5.00100
7 12 17 22 27 32 37
VIN (V)
VOUT (V)
+125°C
-40°C
+25°C
-30
-20
-10
0
10
20
30
0 10 20 30 40 50 60 70 80 90 100
TIME (µs)
CL = 1nF
AMPLITUDE (mV)
-30
-20
-10
0
10
20
30
0 10 20 30 40 50 60 70 80 90 100
CL = 100nF
TIME (µs)
AMPLITUDE (mV)
ISL21090
FN6993 Rev 5.00 Page 13 of 20
February 27, 2013
FIGURE 42. LOAD REGULATION, THREE TEMPERATURES FIGURE 43. LOAD TRANSIENT (ILOAD = ±1mA)
FIGURE 44. TURN-ON TIME WITH 0.1µF FIGURE 45. TURN-ON TIME WITH 1µF
FIGURE 46. ZOUT vs FREQUENCY FIGURE 47. PSRR AT DIFFERENT CAPACITIVE LOADS
Typical Performance Curves (ISL21090-5.0) (Continued)
-240
-200
-160
-120
-80
-40
0
40
80
-20 -15 -10 -5 0 5 10
ILOAD (mA)(SOURCING) (SINKING)
VOUT (PPM)
+125°C -40°C
+25°C
-10
-8
-6
-4
-2
0
2
4
6
8
10
0 20 40 60 80 100 120 140 160 180 200
TIME (µs)
AMPLITUDE (mV)
CL = 100nF
CL = 1µF
-2
0
2
4
6
8
10
12
0 50 100 150 200 250 300 350 400
TIME (µs)
VOUT (V)
CL = 0.1µF
VIN
-2
0
2
4
6
8
10
12
0 50 100 150 200 250 300 350 400
CL = 1µF
VIN
TIME (µs)
VOUT (V)
CL = 100nF
CL = 0
CL = 10nF
CL = 1nF
0.01
0.1
1
10
100
1000
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
ZOUT ()
CL = 10nF
CL = 100nF
-120
-100
-80
-60
-40
-20
0
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
PSRR (dB)
CL = 0
CL = 1nF
ISL21090
FN6993 Rev 5.00 Page 14 of 20
February 27, 2013
FIGURE 48. SHORT-CIRCUIT TO GND FIGURE 49. SHORT-CIRCUIT TO VIN
FIGURE 50. VOUT vs NOISE, 0.1Hz TO 10Hz FIGURE 51. DROPOUT WITH -10mA LOAD
Typical Performance Curves (ISL21090-5.0) (Continued)
-80
-70
-60
-50
-40
-30
-20
7 12 17 22 27 32 37
VIN (V)
CURRENT (mA)
+125°C
-40°C
+25°C
20
30
40
50
60
70
80
90
100
7 12 17 22 27 32 37
VIN (V)
CURRENT (mA)
+125°C
-40°C
+25°C
-5
-4
-3
-2
-1
0
1
2
3
4
5
0 1 2 3 4 5 6 7 8 9 10
TIME (s)
OUTPUT NOISE VOLTAGE (µV)
4.80
4.85
4.90
4.95
5.00
5.05
5.10
6.00 6.10 6.20 6.30 6.40 6.50 6.60 6.70 6.80 6.90 7.00
VIN (V)
VOUT(V)
-40°C
+25°C +125°C
ISL21090
FN6993 Rev 5.00 Page 15 of 20
February 27, 2013
Typical Performance Curves (ISL21090-7.5)
FIGURE 52. IIN vs VIN, THREE UNITS FIGURE 53. IIN vs VIN, THREE TEMPERATURES
FIGURE 54. LINE REGULATION, THREE UNITS FIGURE 55. LINE REGULATION, THREE TEMPERATURES
FIGURE 56. LINE TRANSIENT WITH 1nF LOAD (VIN = ±500mV) FIGURE 57. LINE TRANSIENT WITH 100nF LOAD (VIN = ±500mV)
VIN (V)
IIN (mA)
8.0
9.0
1.0
1.1
1.2
1.3
9 121518212427303336
UNIT 3
UNIT 2
UNIT 1
VIN (V)
IIN (mA)
7.0
8.0
9.0
1.0
1.1
1.2
1.3
1.4
9 121518212427303336
+125°C
-40°C
+25°C
VIN (V)
VOUT (PPM)
-6
-5
-4
-3
-2
-1
0
1
2
3
9 121518212427303336
UNIT 3
UNIT 2
UNIT 1
VIN (V)
VOUT (PPM)
-15
-13
-11
-9
-7
-5
-3
-1
1
3
5
9 121518212427303336
+125°C -40°C
+25°C
-30
-20
-10
0
10
20
30
0 102030405060708090100
TIME (µs)
CL = 1nF
AMPLITUDE (mV)
-30
-20
-10
0
10
20
30
0 102030405060708090100
CL = 100nF
TIME (µs)
AMPLITUDE (mV)
ISL21090
FN6993 Rev 5.00 Page 16 of 20
February 27, 2013
FIGURE 58. LOAD REGULATION, THREE TEMPERATURES FIGURE 59. LOAD TRANSIENT (ILOAD = ±1mA)
FIGURE 60. TURN-ON TIME WITH 0.1µF FIGURE 61. TURN-ON TIME WITH 1µF
FIGURE 62. ZOUT vs FREQUENCY FIGURE 63. PSRR AT DIFFERENT CAPACITIVE LOADS
Typical Performance Curves (ISL21090-7.5) (Continued)
-100
-50
0
50
100
150
200
-20 -15 -10 -5 0 5 10
ILOAD (mA)(SOURCING) (SINKING)
VOUT (PPM)
+125°C
-40°C
+25°C
-10
-8
-6
-4
-2
0
2
4
6
8
0 20 40 60 80 100 120 140 160 180 200
TIME (µs)
AMPLITUDE (mV)
CL = 100nF
CL = 1µF
-2
0
2
4
6
8
10
12
14
16
18
0 50 100 150 200 250 300 350 400
TIME (µs)
VOUT (V)
VIN
CL = 0.1µF
-2
0
2
4
6
8
10
12
14
16
18
0 50 100 150 200 250 300 350 400
CL = 1µF
VIN
TIME (µs)
VOUT (V)
0.01
0.1
1
10
100
10 100 1K 10K 100K 1M 10M
CL = 100nF
CL = 0
CL = 10nF
CL = 1nF
FREQUENCY (Hz)
ZOUT ()
-120
-100
-80
-60
-40
-20
0
10 100 1K 10K 100K 1M 10M
CL = 10nF
CL = 100nF
FREQUENCY (Hz)
PSRR (dB)
CL = 0
CL = 1nF
ISL21090
FN6993 Rev 5.00 Page 17 of 20
February 27, 2013
FIGURE 64. SHORT-CIRCUIT TO GND FIGURE 65. SHORT-CIRCUIT TO VIN
FIGURE 66. VOUT vs NOISE, 0.1Hz TO 10Hz FIGURE 67. DROPOUT WITH -10mA LOAD
Typical Performance Curves (ISL21090-7.5) (Continued)
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
9 121518212427303336
VIN (V)
CURRENT(mA)
+125°C
-40°C
+25°C
30
40
50
60
70
80
90
9 121518212427303336
100
VIN (V)
CURRENT (mA)
+125°C
-40°C
+25°C
-5
-4
-3
-2
-1
0
1
2
3
4
5
012345678910
TIME (s)
OUTPUT NOISE VOLTAGE (µV)
7.495
7.4955
7.496
7.4965
7.497
7.4975
7.498
7.4985
7.499
7.4995
7.5
8.3 8.4 8.5 8.6 8.7 8.8 8.9 9
VIN (V)
VOUT(V)
-40°C
+25°C
+125°C
ISL21090
FN6993 Rev 5.00 Page 18 of 20
February 27, 2013
Device Operation
Precision Bandgap Reference
The ISL21090 uses a bandgap architecture and special trimming
circuitry to produce a temperature compensated, precision
voltage reference with high input voltage capability and
moderate output current drive. Low noise performance is
achieved using optimized biasing techniques. Key features for
precision low noise portable applications, such as handheld
meters and instruments, are supply current (900µA) and noise
(0.1Hz to 10Hz bandwidth) 1.0µVP-P to 6.2µVP-P. Data Converters
in particular can utilize the ISL21090 as an external voltage
reference. Low power DAC and ADC circuits will realize maximum
resolution with lowest noise. The device maintains output voltage
during conversion cycles with fast response, although it is helpful
to add an output capacitor, typically 1μF. In the case of the 1.25V
option, a 0.01µF capacitor must be added to the COMP (pin 3) for
stabilization purposes, and a minimum of 0.1µF capacitor must be
added at the output.
Applications Information
Board Mounting Considerations
For applications requiring the highest accuracy, the board
mounting location should be reviewed. The device uses a plastic
SOIC package, which subjects the die to mild stresses when the
printed circuit (PC) board is heated and cooled, which slightly
changes the shape. Because of these die stresses, placing the
device in areas subject to slight twisting can cause degradation
of reference voltage accuracy. It is normally best to place the
device near the edge of a board, or on the shortest side, because
the axis of bending is most limited in that location. Mounting the
device in a cutout also minimizes flex. Obviously, mounting the
device on flexprint or extremely thin PC material will likewise
cause loss of reference accuracy.
Board Assembly Considerations
Some PC board assembly precautions are necessary. Normal
output voltage shifts of 100µV to 500µV can be expected with
Pb-free reflow profiles or wave solder on multi-layer FR4 PC
boards. Precautions should be taken to avoid excessive heat or
extended exposure to high reflow or wave solder temperatures.
Noise Performance and Reduction
The output noise voltage in a 0.1Hz to 10Hz bandwidth is typically
1.9µVP-P (VOUT = 2.5V). The noise measurement is made with a
bandpass filter. The filter is made of a 1-pole high-pass filter, with a
corner frequency at 0.1Hz, and a 2-pole low-pass filter, with a
corner frequency (3dB) at 9.9Hz, to create a filter with a 9.9Hz
bandwidth. Noise in the 10Hz to 1kHz bandwidth is approximately
1.6µVRMS (VOUT = 2.5V), with 0.1µF capacitance on the output.
This noise measurement is made with a 2 decade bandpass filter.
The filter is made of a 1-pole high-pass filter with a corner
frequency at 10Hz of the center frequency, and 1-pole low-pass
filter with a corner frequency at 1kHz. Load capacitance up to
10µF can be added but will result in only marginal improvements
in output noise and transient response.
Turn-On Time
Normal turn-on time is typically 150µs, as shown in Figure 27.
The circuit designer must take this into account when looking at
power-up delays or sequencing.
Temperature Coefficient
The limits stated for temperature coefficient (Tempco) are governed
by the method of measurement. The overwhelming standard for
specifying the temperature drift of a reference is to measure the
reference voltage at two temperatures, take the total variation,
(VHIGH – VLOW), and divide by the temperature extremes of
measurement (THIGH –T
LOW). The result is divided by the nominal
reference voltage (at T = +25°C) and multiplied by 106 to yield
ppm/°C. This is the “Box” method for specifying temperature
coefficient.
Output Voltage Adjustment
The output voltage can be adjusted above and below the
factory-calibrated value via the trim terminal. The trim terminal is
the negative feedback divider point of the output op amp. The
positive input of the amplifier is about 1.216V, and in feedback,
so will be the trim voltage. The trim terminal has a 5000Ω
resistor to ground internally, and in the case of the 2.5V output
version, there is a feedback resistor of approximately 5000Ω
from VOUT to trim.
The suggested method to adjust the output is to connect a very
high value external resistor directly to the trim terminal and
connect the other end to the wiper of a potentiometer that has a
much lower total resistance and whose outer terminals connect
to VOUT and ground. If a 1MΩ resistor is connected to trim, the
output adjust range will be ±6.3mV. It is important to minimize
the capacitance on the trim terminal to preserve output amplifier
stability. It is also best to connect the series resistor directly to
the trim terminal, to minimize that capacitance and also to
minimize noise injection. Small trim adjustments will not disturb
the factory-set temperature coefficient of the reference, but
trimming near the extreme values can.
FN6993 Rev 5.00 Page 19 of 20
February 27, 2013
ISL21090
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such
modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets are
current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its
subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
For additional products, see www.intersil.com/en/products.html
© Copyright Intersil Americas LLC 2011-2013. All Rights Reserved.
All trademarks and registered trademarks are the property of their respective owners.
About Intersil
Intersil Corporation is a leader in the design and manufacture of high-performance analog, mixed-signal and power management
semiconductors. The company's products address some of the fastest growing markets within the industrial and infrastructure,
personal computing and high-end consumer markets. For more information about Intersil or to find out how to become a member of
our winning team, visit our website and career page at www.intersil.com.
For a complete listing of Applications, Related Documentation and Related Parts, please see the respective product information page.
Also, please check the product information page to ensure that you have the most updated datasheet: ISL21090B12, ISL21090B25,
ISL21090B50, ISL21090B75
To report errors or suggestions for this datasheet, please go to: www.intersil.com/askourstaff
Reliability reports are available from our website at: http://rel.intersil.com/reports/search.php
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you
have the latest revision.
DATE REVISION CHANGE
February 6, 2013 FN6993.5 Electrical Spec Table on page 3 - Noise Voltage Density changed Typ from “35.4” to “25”
Removed Sinking: -10mA ≤ IOUT ≤ 0mA and ISC- Short Circuit Current
Added Long Term Stability to options 2.5V, 5V and 7.5V on pages 4 and 5
Updated Figure 9 on page 7 by removing ILOAD (mA) and Sinking and x-axis numbering changed from “-25 to
15” to “-25 to 0’.
Removed Figure which was titled “Short Circuit to VIN”
January 9, 2013 FN6993.4 Added 7.5V option to Ordering Information table on page 2.
Added 7.5V option “Electrical Specifications” table to page 5.
Added 7.5V Typical Performance Curves section on page 15.
August 22, 2012 FN6993.3 Added 5.0V option “Typical Performance Curves” table to page 12.
Removed 7.5V and 10V option Electrical Specs
May 1, 2012 FN6993.2 Added 5.0V option “Electrical Specifications” table to page 5.
Added 7.5V option “Electrical Specifications” table to page 5.
Added 10.0V option “Electrical Specifications” table to page 5.
March 5, 2012 FN6993.1 Added 1.25V option “Electrical Specifications” table to page 3.
Added 1.25V Typical Performance Curves section on page 6.
Changed MIN limit for VIN 2.5V option on page 4.
June 8, 2011 FN6993.0 Initial Release
ISL21090
FN6993 Rev 5.00 Page 20 of 20
February 27, 2013
Package Outline Drawing
M8.15E
8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE
Rev 0, 08/09
Unless otherwise specified, tolerance : Decimal ± 0.05
The pin #1 identifier may be either a mold or mark feature.
Interlead flash or protrusions shall not exceed 0.25mm per side.
Dimension does not include interlead flash or protrusions.
Dimensions in ( ) for Reference Only.
Dimensioning and tolerancing conform to AMSE Y14.5m-1994.
3.
5.
4.
2.
Dimensions are in millimeters.1.
NOTES:
DETAIL "A"
SIDE VIEW “A
TYPICAL RECOMMENDED LAND PATTERN
TOP VIEW
A
B
4
4
0.25 AMC B
C
0.10 C
5
ID MARK
PIN NO.1
(0.35) x 45°
SEATING PLANE
GAUGE PLANE
0.25
(5.40)
(1.50)
4.90 ± 0.10
3.90 ± 0.10
1.27 0.43 ± 0.076
0.63 ±0.23
4° ± 4°
DETAIL "A" 0.22 ± 0.03
0.175 ± 0.075
1.45 ± 0.1
1.75 MAX
(1.27) (0.60)
6.0 ± 0.20
Reference to JEDEC MS-012.
6.
SIDE VIEW “B”
