DATASHEET

Ultra Low Noise, Precision Voltage Reference
ISL21090
Features
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).
• 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%
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.
• 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
Applications
• High-end instrumentation
• Line regulation . . . . . . . . . . . . . . . . . . .6ppm/V (1.25V option)
• Precision voltage sources for data acquisition system,
industrial control, communication infrastructure
• Load regulation . . . . . . . . . . . . . . 2.5ppm/mA (1.25V option)
• Process control and instrumentations
Related Literature
• Operating temperature range. . . . . . . . . . . .-40°C to +125°C
• Active source for sensors
VIN
2
10µF
0.1µF
3
4
DNC
DNC
VIN
DNC
COMP
GND
VDD
SERIAL CLOCK
CHIP SELECT
SERIAL DATA I/O
VOUT
TRIM
2.5010
8
7
2.5005
6
2.5000
5
0.1µF
VREF
SCLK
OUTxS
CSb
OUTxF
SDIO
2.4990
2.4985
GND
2.4980
-55
-35
-15
5
25
45
65
85
105
125
145
TEMPERATURE (°C)
FIGURE 1. ISL21090 TYPICAL APPLICATION DIAGRAM
1
2.4995
DACOUTx
DAC
February 27, 2013
FN6993.5
TYPICAL TEMPERATURE
COEFFICIENT CURVE FOR 10 UNITS
VREF
VOUT (V)
1
See AN1764, “ISL21090XXEV1Z User’s Guide”
FIGURE 2. VOUT vs TEMPERATURE (2.5V OPTION)
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 2011-2013. 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.
ISL21090
Pin Configuration
ISL21090
(8 LD SOIC)
TOP VIEW
1
DNC
DNC
VIN
DNC
8
7
2
3
4
COMP
6
VOUT
GND
5
TRIM
Pin Descriptions
PIN NUMBER
PIN NAME
DESCRIPTION
1, 7, 8
DNC
Do Not Connect
2
VIN
Input Voltage Connection
3
COMP
4
GND
Ground Connection
5
TRIM
Voltage Reference Trim input
6
VOUT
Voltage Reference Output
Compensation and Noise Reduction Capacitor
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.
2
FN6993.5
February 27, 2013
ISL21090
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)
θJA (°C/W) θJC (°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. θJA 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 θJC, 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
VOUT
Output Voltage
VIN = 5V,
VOA
VOUT Accuracy @ TA = +25°C (Note 6)
VOUT = 1.25V
Output Voltage Temperature Coefficient
(Note 8)
ISL21090 B grade
VIN
Input Voltage Range
VOUT = 1.25V
IIN
Supply Current
ΔVOUT /ΔVIN
Line Regulation
VIN = 3.7V to 36V, VOUT = 1.25V
ΔVOUT/ΔIOUT
Load Regulation
MIN
(Note 7)
TYP
MAX
(Note 7)
1.25
V
+0.03
%
7
ppm/°C
36
V
0.750
1.28
mA
6
17
ppm/V
Sourcing: 0mA ≤ IOUT ≤ 20mA
2.5
17
ppm/mA
Dropout 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
tR
Turn-on Settling Time
90% of final value, CL = 1.0µF, CC = open
150
µs
Ripple Rejection
f = 120Hz
90
dB
Voltage Noise
0.1Hz ≤ f ≤ 10Hz, VOUT = 1.25V
1.0
µVP-P
Vn
Broadband Voltage Noise
10Hz ≤ f ≤ 1kHz, VOUT = 1.25V
1.2
µVRMS
en
Noise Voltage Density
f = 1kHz, VOUT = 1.25V
25
nV/√Hz
Long Term Stability
TA = +25°C
20
ppm
TC VOUT
VD
enp-p
ΔVOUT/Δt
3
-0.03
UNIT
3.7
FN6993.5
February 27, 2013
ISL21090
Electrical Specifications
temperature range, -40°C to +125°C.
PARAMETER
VIN = 5V (2.5V option), IOUT = 0 unless otherwise specified. Boldface limits apply over the operating
DESCRIPTION
CONDITIONS
VOUT
Output Voltage
VIN = 5V
VOA
VOUT Accuracy @ TA = +25°C
All VOUT options
Output Voltage Temperature Coefficient
ISL21090 B grade
VIN
Input Voltage Range
VOUT = 2.5V
IIN
Supply Current
ΔVOUT /ΔVIN
Line Regulation
ΔVOUT/ΔIOUT
Load Regulation
TC VOUT
MIN
(Note 7)
TYP
MAX
(Note 7)
UNIT
2.5
-0.02
V
+0.02
%
7
ppm/°C
36
V
0.930
1.28
mA
VIN = 3.7V to 36V, VOUT = 2.5V
8
18
ppm/V
Sourcing: 0mA ≤ IOUT ≤ 20mA
2.5
17
ppm/mA
Sinking: -10mA ≤ IOUT ≤ 0mA
2.5
17
ppm/mA
1.7
V
3.7
VD
Dropout Voltage (Note 9)
VOUT = 2.5V @ 10mA
1.1
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
tR
Turn-on Settling Time
90% of final value, CL = 1.0µF, CC = open
150
µs
Ripple Rejection
f = 120Hz
90
dB
Noise Voltage
0.1Hz ≤ f ≤ 10Hz, VOUT = 2.5V
1.9
µVP-P
Vn
Broadband Voltage Noise
10Hz ≤ f ≤ 1kHz, VOUT = 2.5V
1.6
µVRMS
en
Noise Voltage Density
f = 1kHz, VOUT = 2.5V
50
nV/√Hz
Long Term Stability
TA = +25°C
20
ppm
enp-p
ΔVOUT/Δt
Electrical Specifications
temperature range, -40°C to +125°C.
PARAMETER
VIN = 10V (5.0V option), IOUT = 0 unless otherwise specified. Boldface limits apply over the operating
DESCRIPTION
CONDITIONS
VOUT
Output Voltage
VIN = 10V,
VOA
VOUT Accuracy @ TA = +25°C (Note 6)
VOUT = 5.0V
TC VOUT
MIN
(Note 7)
TYP
MAX
(Note 7)
5.0
0.025
UNIT
V
0.025
%
7
ppm/°C
36
V
0.930
1.33
mA
8
18
ppm/V
Output Voltage Temperature Coefficient ISL21090 B grade
(Note 8)
VIN
Input Voltage Range
IIN
Supply Current
ΔVOUT /ΔVIN
Line Regulation
VIN = 7V to 36V, VOUT = 5.0V
ΔVOUT/ΔIOUT
Load Regulation
Sourcing: 0mA ≤ IOUT ≤ 20mA
2.5
17
ppm/mA
Sinking: -10mA ≤ IOUT ≤ 0mA
2.5
17
ppm/mA
1.7
V
VOUT = 5.0V
7
VD
Dropout Voltage (Note 9)
VOUT = 5.0V @ 10mA
1.1
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
tR
Turn-on Settling Time
90% of final value, CL = 1.0µF, CC = open
150
µs
Ripple Rejection
f = 120Hz
90
dB
Output Voltage Noise
0.1Hz ≤ f ≤ 10Hz, VOUT = 5.0V
4.2
µVP-P
Vn
Broadband Voltage Noise
10Hz ≤ f ≤ 1kHz, VOUT = 5.0V
3.2
µVRMS
en
Noise Voltage Density
f = 1kHz, VOUT = 5.0V
100
nV/√Hz
Long Term Stability
TA = +25°C
20
ppm
enp-p
ΔVOUT/Δt
4
FN6993.5
February 27, 2013
ISL21090
Electrical Specifications
temperature range, -40°C to +125°C.
PARAMETER
VIN = 15V (7.5V option), IOUT = 0 unless otherwise specified. Boldface limits apply over the operating
DESCRIPTION
CONDITIONS
MIN
(Note 7)
MAX
(Note 7)
UNIT
0.035
%
7
ppm/°C
36
V
0.940
1.30
mA
TYP
VOUT
Output Voltage
VIN = 15V,
VOA
VOUT Accuracy @ TA = +25°C (Note 6)
VOUT = 7.5V
Output Voltage Temperature Coefficient
(Note 8)
ISL21090 B grade
VIN
Input Voltage Range
VOUT = 7.5V
IIN
Supply Current
ΔVOUT /ΔVIN
Line Regulation
VIN = 9V to 36V, VOUT = 7.5V
2.3
18
ppm/V
ΔVOUT/ΔIOUT
Load Regulation
Sourcing: 0mA ≤ IOUT ≤ 20mA
2.5
17
ppm/mA
Sinking: -10mA ≤ IOUT ≤ 0mA
9
17
ppm/mA
1.06
1.8
V
TC VOUT
VD
7.5
0.035
9
V
Dropout Voltage (Note 9)
VOUT = 7.5V @ 10mA
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
tR
Turn-on Settling Time
90% of final value, CL = 1.0µF, CC = open
150
µs
Ripple Rejection
f = 120Hz
90
dB
Output Voltage Noise
0.1Hz ≤ f ≤ 10Hz, VOUT = 7.5V
6.2
µVP-P
Vn
Broadband Voltage Noise
10Hz ≤ f ≤ 1kHz, VOUT = 7.5V
4.8
µVRMS
en
Noise Voltage Density
f = 1kHz, VOUT = 7.5V
150
nV/√Hz
Long Term Stability
TA = +25°C
20
ppm
enp-p
ΔVOUT/Δt
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.
5
FN6993.5
February 27, 2013
ISL21090
Typical Performance Curves (ISL21090-1.25V)
900
1200
850
1100
1000
UNIT 1
700
+125°C
900
UNIT 2
750
IIN (µA)
IIN (µA)
800
UNIT 3
650
+25°C
800
700
600
600
500
550
3.7
400
3.7
8.7
13.7
18.7
23.7
VIN (V)
28.7
33.7
-40°C
13.7
18.7
33.7
1.2503
1.2502
1.2502
1.2501
VOUT (V)
UNIT 1
1.2501
1.2500
UNIT 3
1.2499
UNIT 2
1.2498
+25°C
1.2500
1.2499
1.2498
-40°C
1.2497
+125°C
1.2496
1.2497
1.2495
1.2496
3.7
8.7
13.7
18.7
23.7
28.7
33.7
38.7
1.2494
3.7
8.7
13.7
18.7
28.7
33.7
FIGURE 6. LINE REGULATION, THREE TEMPERATURES
3
2.0
2
1.5
AMPLITUDE (mV)
1
CL = 10nF
0
23.7
VIN (V)
VIN (V)
FIGURE 5. LINE REGULATION, THREE UNITS
AMPLITUDE (mV)
28.7
FIGURE 4. IIN vs VIN, THREE TEMPERATURES
1.2503
-1
-2
-3
-4
23.7
VIN (V)
FIGURE 3. IIN vs VIN, THREE UNITS
VOUT (V)
8.7
1.0
0.5
CL = 100nF
0
-0.5
-1.0
-1.5
-2.0
0
10
20
30
40
50
60
70
80
90
100
TIME (µs)
FIGURE 7. LINE TRANSIENT WITH 10nF LOAD (ΔVIN = ±500mV)
6
0
10
20
30
40
50
60
70
80
90
100
TIME (µs)
FIGURE 8. LINE TRANSIENT WITH 100nF LOAD (ΔVIN = ±500mV)
FN6993.5
February 27, 2013
ISL21090
Typical Performance Curves (ISL21090-1.25V) (Continued)
40
30
32
20
16
AMPLITUDE (mV)
24
ΔVOUT (PPM)
100nF
+25°C
+125°C
8
0
-8
-16
10
-10
-20
-40°C
-24
-25
-20
-15
-10
SOURCING ILOAD (mA)
1µF
0
-5
-30
0
0
6
5
5
VOUT (V)
VOUT (V)
2
1000
1200
3
2
1
1
CL = 0.1µF
0
0
50
CL = 1µF
0
-1
100 150 200 250 300 350 400 450 500 550
0
50
100 150 200 250 300 350 400 450 500 550
TIME (µs)
TIME (µs)
FIGURE 11. TURN ON TIME WITH 0.1µF
100
FIGURE 12. TURN ON TIME WITH 1µF
0
CL = 1nF
100nF
CL = 10nF
10
-20
1
-40
PSRR (dB)
ZOUT (Ω)
800
VIN
4
VIN
3
0.1
CL = 10µF
0.01
CL = 1µF
0.001
0.0001
600
FIGURE 10. LOAD TRANSIENT (ΔILOAD = ±1mA)
6
-1
400
TIME (µs)
FIGURE 9. LOAD REGULATION, THREE TEMPERATURE
4
200
100
-80
-100
CL = 100nF
10
1µF
-60
1k
10k
100k
1M
FREQUENCY (Hz)
FIGURE 13. ZOUT vs FREQUENCY (COMP = 0.01µF)
7
10M
-120
10
100
1k
10k
100k
FREQUENCY (Hz)
1M
10M
FIGURE 14. PSRR AT DIFFERENT CAPACITIVE LOADS
FN6993.5
February 27, 2013
ISL21090
Typical Performance Curves (ISL21090-1.25V) (Continued)
-30
X = 1s/DIV
Y = 0.5µV/DIV
+125°C
-40
-45
+25°C
-50
-55
-40°C
-60
-65
3.7
8.7
13.7
18.7
23.7
28.7
33.7
VIN (V)
FIGURE 15. SHORT CIRCUIT TO GND
FIGURE 16. VOUT vs NOISE, 0.1Hz TO 10Hz
1.2502
+25°C
1.2500
1.2498
VOUT (V)
CURRENT (mA)
-35
-40°C
1.2496
1.2494
1.2492
+85°C
1.2490
3.7
8.7
13.7
18.7
23.7
28.7
33.7
VIN (V)
FIGURE 17. DROPOUT WITH -10mA LOAD
8
FN6993.5
February 27, 2013
ISL21090
Typical Performance Curves (ISL21090-2.5)
1300
1000
1200
980
UNIT 3
1100
IIN (µA)
IIN (µA)
960
940
UNIT 1
920
900
800
900
UNIT 2
700
19
600
4
880
4
9
14
24
VIN (V)
29
34
39
FIGURE 18. IIN vs VIN, THREE UNITS
-40°C
9
14
19
34
39
+25°C
2.500000
2.499800
VOUT (V)
2.500190
2.500090
2.499990
UNIT 2
UNIT 3
2.499890
2.499600
+125°C
2.499400
-40°C
2.499200
2.499000
2.499790
2.499690
3
6
9
12
15
18
21
24
27
30
33
36
2.498800
4
39
9
14
19
VIN (V)
FIGURE 20. LINE REGULATION, THREE UNITS
30
30
20
20
10
CL = 1nF
0
24
VIN (V)
29
34
39
FIGURE 21. LINE REGULATION, THREE TEMPERATURES
AMPLITUDE (mV)
AMPLITUDE (mV)
29
2.500200
UNIT 1
2.500290
-10
10
CL = 100nF
0
-10
-20
-20
-30
24
VIN (V)
FIGURE 19. IIN vs VIN, THREE TEMPERATURES
2.500390
VOUT (V)
+125°C
+25°C
1000
0
10
20
30
40
50
60
TIME (µs)
70
80
90
100
FIGURE 22. LINE TRANSIENT WITH 1nF LOAD (ΔVIN = ±500mV)
9
-30
0
10
20
30
40
50
60
70
80
90
100
TIME (µs)
FIGURE 23. LINE TRANSIENT WITH 100nF LOAD (ΔVIN = ±500mV)
FN6993.5
February 27, 2013
ISL21090
Typical Performance Curves (ISL21090-2.5) (Continued)
6
12
8
4
AMPLITUDE (mV)
+25°C
ΔVOUT (PPM)
4
0
-40°C
-4
-8
+125°C
CL = NO LOAD
2
0
-2
CL = 100nF
-4
-12
-16
-25
-20
-15
-10
-5
0
5
10
ILOAD (mA)
(SOURCING)
15
-6
20
0
20
5
5
4
VIN
3
VOUT (V)
VOUT (V)
4
2
CL = 0.1µF
1
0
250
300
350
VIN
CL = 1µF
1
-1
200
400
0
50
100
150
200
250
300
350
400
TIME (µs)
TIME (µs)
FIGURE 26. TURN-ON TIME WITH 0.1µF
FIGURE 27. TURN-ON TIME WITH 1µF
0
1000
100
-20
CL = NO LOAD
CL = 100nF
-40
PSRR (dB)
CL = 10nF
CL = 100nF
10
1
CL = 1nF
CL = 10nF
-60
CL = 1nF
-80
-100
0.1
0.01
10
120
2
-1
150
100
3
0
100
80
FIGURE 25. LOAD TRANSIENT (ΔILOAD = ±1mA)
6
50
60
TIME (µs)
6
0
40
(SINKING)
FIGURE 24. LOAD REGULATION, THREE TEMPERATURES
ZOUT (Ω)
CL = 1µF
-120
100
1k
10k
100k
FREQUENCY (Hz)
FIGURE 28. ZOUT vs FREQUENCY
10
1M
10M
-140
10
CL = NO LOAD
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
FIGURE 29. PSRR AT DIFFERENT CAPACITIVE LOADS
FN6993.5
February 27, 2013
ISL21090
-30
90
-35
80
-40°C
-40
CURRENT (mA)
CURRENT (mA)
Typical Performance Curves (ISL21090-2.5) (Continued)
+125°C
-45
+25°C
-50
-55
-40°C
-60
-65
3
8
13
70
60
+25°C
50
40
18
23
VIN (V)
28
33
30
38
+125°C
3
8
2.5005
18
23
28
33
38
VIN (V)
FIGURE 31. SHORT-CIRCUIT TO VIN
FIGURE 30. SHORT-CIRCUIT TO GND
2.5010
13
X = 10s/DIV
Y = 1µV/DIV
TYPICAL TEMPERATURE
COEFFICIENT CURVE FOR 10 UNITS
VOUT (V)
2.5000
2.4995
2.4990
2.4985
2.4980
-55
-35
-15
5
25
45
65
85
105
125 145
TEMPERATURE (°C)
FIGURE 32. VOUT vs TEMPERATURE, 10 UNITS
2.5000
FIGURE 33. VOUT vs NOISE, 0.1Hz TO 10Hz
50
+25°C
40
2.4998
30
20
+85°C
PPM
VOUT (V)
2.4996
2.4994
10
0
2.4992
-10
2.4990
-20
-40°C
2.4988
0
5
10
15
20
VIN (V)
25
30
FIGURE 34. DROPOUT WITH -10mA LOAD
11
35
40
-30
0
500
1000
1500
TIME (Hrs)
2000
2500
3000
FIGURE 35. LONG TERM STABILITY
FN6993.5
February 27, 2013
ISL21090
Typical Performance Curves (ISL21090-5.0)
1150
1300
1100
1200
UNIT 1
1100
UNIT 2
1000
800
900
7
12
17
22
VIN (V)
27
32
600
7
37
22
VIN (V)
27
32
37
+25°C
5.00050
5.00050
5.00040
5.00000
UNIT 2
4.99950
VOUT (V)
5.00030
VOUT (V)
17
5.00100
UNIT 1
5.00060
5.00020
5.00010
5.00000
4.99900
-40°C
4.99850
4.99800
4.99990
4.99980
7
12
17
22
VIN (V)
27
32
4.99700
37
7
12
17
22
VIN (V)
27
32
37
FIGURE 39. LINE REGULATION, THREE TEMPERATURES
30
20
20
AMPLITUDE (mV)
30
10
CL = 1nF
0
+125°C
4.99750
UNIT 3
FIGURE 38. LINE REGULATION, THREE UNITS
AMPLITUDE (mV)
12
FIGURE 37. IIN vs VIN, THREE TEMPERATURES
5.00070
4.99970
-40°C
700
UNIT 3
FIGURE 36. IIN vs VIN, THREE UNITS
-10
-20
-30
+25°C
900
950
850
+125°C
1000
IIN (µA)
IIN (µA)
1050
10
CL = 100nF
0
-10
-20
0
10
20
30
40
50
60
70
80
90
100
TIME (µs)
FIGURE 40. LINE TRANSIENT WITH 1nF LOAD (ΔVIN = ±500mV)
12
-30
0
10
20
30
40
50
60
TIME (µs)
70
80
90
100
FIGURE 41. LINE TRANSIENT WITH 100nF LOAD (ΔVIN = ±500mV)
FN6993.5
February 27, 2013
ISL21090
Typical Performance Curves (ISL21090-5.0) (Continued)
10
80
8
+25°C
0
6
AMPLITUDE (mV)
ΔVOUT (PPM)
40
-40
-80
-120
-40°C
+125°C
-160
-200
CL = 100nF
4
CL = 1µF
2
0
-2
-4
-6
-8
-240
-20
-15
(SOURCING)
-10
-5
ILOAD (mA)
0
-10
5
10
(SINKING)
0
FIGURE 42. LOAD REGULATION, THREE TEMPERATURES
12
10
10
VIN
VOUT (V)
VOUT (V)
CL = 0.1µF
2
80
140
160
180
200
VIN
6
4
CL = 1µF
0
0
50
100
150
200
250
300
350
-2
400
0
50
100
150
FIGURE 44. TURN-ON TIME WITH 0.1µF
250
300
350
400
FIGURE 45. TURN-ON TIME WITH 1µF
0
1000
CL = 0
CL = 1nF
-20
100
CL = 0
1
CL = 1nF
PSRR (dB)
CL = 10nF
10
CL = 100nF
0.1
0.01
200
TIME (µs)
TIME (µs)
ZOUT (Ω)
100 120
TIME (µs)
2
0
-2
60
8
6
4
40
FIGURE 43. LOAD TRANSIENT (ΔILOAD = ±1mA)
12
8
20
-40
CL = 100nF
-60
CL = 10nF
-80
-100
10
100
1k
10k
100k
FREQUENCY (Hz)
FIGURE 46. ZOUT vs FREQUENCY
13
1M
10M
-120
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
FIGURE 47. PSRR AT DIFFERENT CAPACITIVE LOADS
FN6993.5
February 27, 2013
ISL21090
Typical Performance Curves (ISL21090-5.0) (Continued)
-20
100
CURRENT (mA)
CURRENT (mA)
-40
+125°C
-50
+25°C
-60
-70
-80
-40°C
7
12
80
70
+125°C
50
40
30
17
22
VIN (V)
27
32
20
37
7
12
17
22
VIN (V)
27
32
37
FIGURE 49. SHORT-CIRCUIT TO VIN
5
5.10
4
5.05
3
2
5.00
1
VOUT(V)
OUTPUT NOISE VOLTAGE (µV)
+25°C
60
FIGURE 48. SHORT-CIRCUIT TO GND
0
-1
4.95
4.90
-2
-3
-40°C
+25°C
+125°C
4.85
-4
-5
-40°C
90
-30
0
1
2
3
4
5
6
7
8
TIME (s)
FIGURE 50. VOUT vs NOISE, 0.1Hz TO 10Hz
14
9
10
4.80
6.00 6.10 6.20 6.30 6.40 6.50 6.60 6.70 6.80 6.90 7.00
VIN (V)
FIGURE 51. DROPOUT WITH -10mA LOAD
FN6993.5
February 27, 2013
ISL21090
Typical Performance Curves (ISL21090-7.5)
1.4
1.3
1.3
UNIT 1
1.2
1.1
IIN (mA)
IIN (mA)
1.2
UNIT 2
1.0
1.1
+25°C
+125°C
1.0
9.0
9.0
8.0
UNIT 3
8.0
9
12
15
18
21
24
VIN (V)
27
7.0
30
33
36
FIGURE 52. IIN vs VIN, THREE UNITS
5
2
3
ΔVOUT (PPM)
ΔVOUT (PPM)
UNIT 2
-1
-2
-3
-4
18
21
24
VIN (V)
27
30
33
36
+25°C
-1
-3
-5
-7
-40°C
+125°C
-9
-11
UNIT 3
-5
-13
9
12
15
18
21
24
VIN (V)
27
30
33
-15
36
20
20
AMPLITUDE (mV)
30
10
CL = 1nF
-10
-20
-30
12
15
18
21
24
27
30
33
36
FIGURE 55. LINE REGULATION, THREE TEMPERATURES
30
0
9
VIN (V)
FIGURE 54. LINE REGULATION, THREE UNITS
AMPLITUDE (mV)
15
1
UNIT 1
0
-6
12
FIGURE 53. IIN vs VIN, THREE TEMPERATURES
3
1
-40°C
9
10
CL = 100nF
0
-10
-20
0
10
20
30
40
50
60
TIME (µs)
70
80
90
100
FIGURE 56. LINE TRANSIENT WITH 1nF LOAD (ΔVIN = ±500mV)
15
-30
0
10
20
30
40
50
60
TIME (µs)
70
80
90
100
FIGURE 57. LINE TRANSIENT WITH 100nF LOAD (ΔVIN = ±500mV)
FN6993.5
February 27, 2013
ISL21090
Typical Performance Curves (ISL21090-7.5) (Continued)
200
8
6
100
AMPLITUDE (mV)
ΔVOUT (PPM)
150
+25°C
50
0
+125°C
-50
-10
CL = 100nF
2
CL = 1µF
0
-2
-4
-6
-40°C
-100
-20
-15
(SOURCING)
4
-8
-5
ILOAD (mA)
0
-10
5
10
(SINKING)
0
FIGURE 58. LOAD REGULATION, THREE TEMPERATURES
40
60
80
140
160
180
200
18
16
16
14
14
VIN
12
VOUT (V)
8
6
CL = 0.1µF
4
VIN
12
10
10
8
6
CL = 1µF
4
2
2
0
0
-2
-2
0
50
100
150
200
250
300
350
400
0
50
100
150
TIME (µs)
FIGURE 60. TURN-ON TIME WITH 0.1µF
0
CL = 1nF
PSRR (dB)
1
CL = 0
CL = 100nF
0.1
100
1K
10K
100K
FREQUENCY (Hz)
FIGURE 62. ZOUT vs FREQUENCY
16
300
350
400
CL = 1nF
-20
CL = 10nF
CL = 10nF
10
0.01
10
200
250
TIME (µs)
FIGURE 61. TURN-ON TIME WITH 1µF
100
ZOUT (Ω)
100 120
TIME (µs)
FIGURE 59. LOAD TRANSIENT (ΔILOAD = ±1mA)
18
VOUT (V)
20
-40
-60
CL = 100nF
CL = 0
-80
-100
1M
10M
-120
10
100
1K
10K
100K
1M
10M
FREQUENCY (Hz)
FIGURE 63. PSRR AT DIFFERENT CAPACITIVE LOADS
FN6993.5
February 27, 2013
ISL21090
Typical Performance Curves (ISL21090-7.5) (Continued)
100
-30
-35
90
-40
+25°C
CURRENT (mA)
CURRENT(mA)
+125°C
-50
-55
-60
-65
-70
-40°C
-75
-80
-40°C
80
-45
9
12
15
18
21
24
VIN (V)
27
30
33
70
+125°C
50
40
30
36
+25°C
60
9
12
18
21
24
VIN (V)
27
30
33
36
FIGURE 65. SHORT-CIRCUIT TO VIN
5
7.5
4
7.4995
3
7.499
2
7.4985
1
7.498
VOUT(V)
OUTPUT NOISE VOLTAGE (µV)
FIGURE 64. SHORT-CIRCUIT TO GND
15
0
-1
+25°C
7.4975
7.497
7.4965
-2
-3
7.496
-4
7.4955
7.495
-5
0
1
2
3
4
5
6
TIME (s)
7
8
FIGURE 66. VOUT vs NOISE, 0.1Hz TO 10Hz
17
9
10
-40°C
8.3
8.4
8.5
8.6
8.7
VIN (V)
+125°C
8.8
8.9
9
FIGURE 67. DROPOUT WITH -10mA LOAD
FN6993.5
February 27, 2013
ISL21090
Device Operation
Turn-On Time
Precision Bandgap Reference
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.
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.
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 – TLOW). 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.
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.
18
FN6993.5
February 27, 2013
ISL21090
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
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
For additional products, see www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9000 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 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 data sheets 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
19
FN6993.5
February 27, 2013
ISL21090
Package Outline Drawing
M8.15E
8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE
Rev 0, 08/09
4
4.90 ± 0.10
A
DETAIL "A"
0.22 ± 0.03
B
6.0 ± 0.20
3.90 ± 0.10
4
PIN NO.1
ID MARK
5
(0.35) x 45°
4° ± 4°
0.43 ± 0.076
1.27
0.25 M C A B
SIDE VIEW “B”
TOP VIEW
1.75 MAX
1.45 ± 0.1
0.25
GAUGE PLANE
C
SEATING PLANE
0.10 C
0.175 ± 0.075
SIDE VIEW “A
0.63 ±0.23
DETAIL "A"
(0.60)
(1.27)
NOTES:
(1.50)
(5.40)
1.
Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2.
Dimensioning and tolerancing conform to AMSE Y14.5m-1994.
3.
Unless otherwise specified, tolerance : Decimal ± 0.05
4.
Dimension does not include interlead flash or protrusions.
Interlead flash or protrusions shall not exceed 0.25mm per side.
5.
The pin #1 identifier may be either a mold or mark feature.
6.
Reference to JEDEC MS-012.
TYPICAL RECOMMENDED LAND PATTERN
20
FN6993.5
February 27, 2013
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