ISL21090AFB825Z-TK [INTERSIL]
Ultra Low Noise, Precision Voltage Reference; 超低噪声，高精度电压基准
| 型号： | ISL21090AFB825Z-TK |
| 厂家： | 
Intersil |
| 描述： | Ultra Low Noise, Precision Voltage Reference |
| 文件： | 总17页 (文件大小：1063K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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 to10Hz noise with an initial
voltage accuracy of 0.02% (2.5V option).
• Reference Output Voltage Option
- 1.25V, 2.5V, and 5.0V (Released)
- 7.5V (Coming Soon)
• Initial Accuracy:
- ISL21090-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±0.03%
- ISL21090-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±0.02%
- ISL21090-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±0.025%
The ISL21090 offers 1.25V, 2.5V, and 5.0V 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.
• Output Voltage Noise (0.1Hz to 10Hz). . . . . . . . . . . . 1.0µVP-PTyp
(1.25V Option)
The ISL21090 is ideal for high-end instrumentation, data
acquisition and processing applications requiring high DC
precision where low noise performance is critical.
• 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)
• Load Regulation. . . . . . . . . . . . . . 2.5ppm/mA (1.25V Option)
• Operating Temperature Range. . . . . . . . . . .-40°C to +125°C
• Precision Voltage Sources for Data Acquisition System,
Industrial Control, Communication Infrastructure
• Process Control and Instrumentations
• Active Source for Sensors
Related Literature
See AN1764, “ISL21090XXEV1Z User’s Guide”
1
2
8
7
DNC
VIN
DNC
DNC
VIN
2.5010
TYPICAL TEMPERATURE
VREF
COEFFICIENT CURVE FOR 10 UNITS
2.5005
10µF
0.1µF
3
4
6
5
COMP
GND
VOUT
TRIM
0.1µF
2.5000
2.4995
2.4990
2.4985
2.4980
VDD
SCLK
CSb
VREF
DACOUTx
SERIAL CLOCK
CHIP SELECT
OUTxS
OUTxF
GND
SERIAL DATA I/O
SDIO
-55 -35 -15
5
25
45
65
85
105 125 145
DAC
TEMPERATURE (°C)
FIGURE 2. VOUT vs TEMPERATURE (2.5V OPTION)
FIGURE 1. ISL21090 TYPICAL APPLICATION DIAGRAM
November 21, 2012
FN6993.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2011, 2012. 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.
1
ISL21090
Pin Configuration
ISL21090
(8 LD SOIC)
TOP VIEW
1
2
8
7
DNC
VIN
DNC
DNC
3
4
6
5
COMP
GND
VOUT
TRIM
Pin Descriptions
PIN NUMBER
PIN NAME
DNC
DESCRIPTION
1, 7, 8
Do Not Connect
2
3
4
5
6
VIN
Input Voltage Connection
COMP
GND
Compensation and Noise Reduction Capacitor
Ground Connection
TRIM
VOUT
Voltage Reference Trim input
Voltage Reference Output
Ordering Information
PACKAGE
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
VOUT OPTION
(V)
GRADE
(%)
TEMPCO
(ppm/°C)
TEMP RANGE
(°C)
TAPE & REEL
(Pb-Free)
PKG.
DWG. #
ISL21090BFB812Z-TK
ISL21090BFB825Z-TK
ISL21090BFB850Z-TK
21090 BFZ12
21090 BFZ25
21090 BFZ50
21090 BFZ75
1.25
2.5
5.0
7.5
0.03
0.02
0.02
0.02
7
7
7
7
-40 to +125
-40 to +125
-40 to +125
-40 to +125
8 Ld SOIC
8 Ld SOIC
8 Ld SOIC
8 Ld SOIC
M8.15E
M8.15E
M8.15E
M8.15E
Coming Soon
ISL21090BFB875Z-TK
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. For more information on
MSL please see Tech Brief TB363.
FN6993.3
November 21, 2012
2
ISL21090
Absolute Maximum Ratings
Thermal Information
Max Voltage
Thermal Resistance (Typical)
8 Ld SOIC Package (Notes 4, 5) . . . . . . . . .
Continuous Power Dissipation (TA = +125°C) . . . . . . . . . . . . . . . . .217mW
Maximum Junction Temperature (TJMAX). . . . . . . . . . . . . . . . . . . . . .+150°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
θ
JA (°C/W)
110
θ
JC (°C/W)
60
V
V
IN to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +40V
OUT 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
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.
MIN
(Note 7)
MAX
(Note 7)
PARAMETER
DESCRIPTION
Output Voltage
CONDITIONS
TYP
UNIT
VOUT
VOA
VIN = 5V,
1.25
V
VOUT Accuracy @ TA = +25°C (Note 6) VOUT = 1.25V
-0.03
3.7
+0.03
7
%
TC VOUT
Output Voltage Temperature
ISL21090 B grade
VOUT = 1.25V
ppm/°C
Coefficient (Note 8)
Input Voltage Range
Supply Current
VIN
IIN
36
1.28
17
V
mA
0.750
6
ΔVOUT /ΔVIN
Line Regulation
VIN = 3.7V to 36V, VOUT = 1.25V
Sourcing: 0mA ≤ IOUT ≤ 20mA
Sinking: -10mA ≤ IOUT ≤ 0mA
VOUT = 1.25V @ 10mA
ppm/V
ppm/mA
ppm/mA
V
2.5
2.5
1.7
53
17
ΔVOUT/ΔIOUT
Load Regulation
17
VD
ISC+
ISC-
Dropout Voltage (Note 9)
Short Circuit Current
Short Circuit Current
2.15
TA = +25°C, VOUT tied to GND
TA = +25°C, VOUT tied to VIN
90% of final value, CL = 1.0µF,
mA
-23
mA
tR
Turn-on Settling Time
150
µs
CC = open
Ripple Rejection
f = 120Hz
90
1.0
1.2
35.4
20
dB
enp-p
Vn
Voltage Noise
0.1Hz ≤ f ≤ 10Hz, VOUT = 1.25V
10Hz ≤ f ≤ 1kHz, VOUT = 1.25V
f = 1kHz, VOUT = 1.25V
TA = +25°C
µVP-P
µVRMS
nV/√Hz
ppm
Broadband Voltage Noise
Noise Voltage Density
Long Term Stability
en
ΔVOUT/Δt
FN6993.3
November 21, 2012
3
ISL21090
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.
MIN
(Note 7)
MAX
(Note 7)
PARAMETER
DESCRIPTION
Output Voltage
CONDITIONS
TYP
2.5
UNIT
VOUT
VOA
VIN = 5V
V
%
VOUT Accuracy @ TA = +25°C
All VOUT options
-0.02
3.7
+0.02
7
TC VOUT
Output Voltage Temperature
Coefficient
ISL21090 B grade
ppm/°C
VIN
Input Voltage Range
Supply Current
VOUT = 2.5V
36
1.28
18
V
IIN
0.930
8
mA
ΔVOUT /ΔVIN
ΔVOUT/ΔIOUT
Line Regulation
Load Regulation
VIN = 3.7V to 36V, VOUT = 2.5V
Sourcing: 0mA ≤ IOUT ≤ 20mA
Sinking: -10mA ≤ IOUT ≤ 0mA
VOUT = 2.5V @ 10mA
ppm/V
ppm/mA
ppm/mA
V
2.5
2.5
1.1
17
17
VD
Dropout Voltage
(Note 9)
1.7
ISC+
ISC-
tR
Short Circuit Current
Short Circuit Current
Turn-on Settling Time
TA = +25°C, VOUT tied to GND
TA = +25°C, VOUT tied to VIN
90% of final value, CL = 1.0µF,
55
-61
mA
mA
µs
150
CC = open
Ripple Rejection
f = 120Hz
90
1.9
1.6
50
dB
enp-p
Vn
Noise Voltage
0.1Hz ≤ f ≤ 10Hz, VOUT = 2.5V
10Hz ≤ f ≤ 1kHz, VOUT = 2.5V
f = 1kHz, VOUT = 2.5V
µVP-P
Broadband Voltage Noise
Noise Voltage Density
µVRMS
nV/√Hz
en
Electrical Specifications VIN = 10.0V (5.0V option), IOUT = 0unless otherwise specified. Boldface limits apply over the operating
temperature range, -40°C to +125°C.
MIN
(Note 7)
MAX
(Note 7)
PARAMETER
DESCRIPTION
Output Voltage
CONDITIONS
TYP
5.0
UNIT
VOUT
VOA
VIN = 10.0V,
V
VOUT Accuracy @ TA = +25°C (Note 6) VOUT = 5.0V
0.025
7
0.025
7
%
TC VOUT
Output Voltage Temperature
ISL21090 B grade
VOUT = 5.0V
ppm/°C
Coefficient (Note 8)
Input Voltage Range
Supply Current
VIN
IIN
36
1.33
18
V
mA
0.930
8
ΔVOUT /ΔVIN
Line Regulation
VIN = 7.0V to 36V, VOUT = 5.0V
Sourcing: 0mA ≤ IOUT ≤ 20mA
Sinking: -10mA ≤ IOUT ≤ 0mA
VOUT = 5.0V @ 10mA
ppm/V
ppm/mA
ppm/mA
V
2.5
2.5
1.1
61
17
ΔVOUT/ΔIOUT
Load Regulation
17
VD
ISC+
ISC-
Dropout Voltage (Note 9)
Short Circuit Current
Short Circuit Current
1.7
TA = +25°C, VOUT tied to GND
TA = +25°C, VOUT tied to VIN
90% of final value, CL = 1.0µF,
mA
-75
mA
tR
Turn-on Settling Time
Ripple Rejection
150
90
µs
dB
CC = open
f = 120Hz
FN6993.3
November 21, 2012
4
ISL21090
Electrical Specifications VIN = 10.0V (5.0V option), IOUT = 0unless otherwise specified. Boldface limits apply over the operating
temperature range, -40°C to +125°C. (Continued)
MIN
(Note 7)
MAX
(Note 7)
PARAMETER
DESCRIPTION
Output Voltage Noise
CONDITIONS
TYP
UNIT
enp-p
Vn
0.1Hz ≤ f ≤ 10Hz, VOUT = 5.0V
10Hz ≤ f ≤ 1kHz, VOUT = 5.0V
f = 1kHz, VOUT = 5.0V
4.2
3.2
µVP-P
µVRMS
nV/√Hz
Broadband Voltage Noise
Noise Voltage Density
en
100
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.
FN6993.3
November 21, 2012
5
ISL21090
Typical Performance Curves (ISL21090-1.25V)
900
850
800
750
700
650
600
550
1200
1100
1000
900
+125°C
UNIT 2
+25°C
800
UNIT 1
700
UNIT 3
600
500
-40°C
400
3.7
8.7
13.7
18.7
23.7
(V)
28.7
33.7
3.7
8.7
13.7
18.7
(V)
23.7
28.7
33.7
V
V
IN
IN
FIGURE 3. IIN vs VIN, THREE UNITS
FIGURE 4. IIN vs VIN, THREE TEMPERATURES
1.2503
1.2502
1.2501
1.2500
1.2499
1.2498
1.2497
1.2496
1.2503
1.2502
1.2501
1.2500
1.2499
1.2498
1.2497
1.2496
1.2495
1.2494
UNIT 1
+25°C
UNIT 3
-40°C
UNIT 2
+125°C
3.7
8.7
13.7
18.7
23.7
28.7
33.7
3.7
8.7
13.7
18.7
V
23.7
(V)
28.7
33.7
38.7
V
(V)
IN
IN
FIGURE 5. LINE REGULATION, THREE UNITS
FIGURE 6. LINE REGULATION, THREE TEMPERATURES
2.0
1.5
1.0
0.5
0
3
2
1
0
-1
-2
-3
-4
-0.5
-1.0
-1.5
-2.0
0
10
20
30
40
50
60
70
80
90 100
0
10
20
30
40
50
60
70
80
90 100
TIME (µs)
TIME (µs)
FIGURE 7. LINE TRANSIENT WITH 10nF LOAD (ΔVIN = ±500mV)
FIGURE 8. LINE TRANSIENT WITH 100nF LOAD (ΔVIN = ±500mV)
FN6993.3
November 21, 2012
6
ISL21090
Typical Performance Curves (ISL21090-1.25V)(Continued)
50
40
30
20
10
0
30
20
10
0
100nF
1µF
+25°C
+125°C
-10
-20
-30
-10
-20
-30
-40°C
-25
-20
-15
-10
-5
0
5
10
15
0
200
400
600
TIME (µs)
800
1000
1200
SOURCING
I
(mA)
SINKING
LOAD
FIGURE 9. LOAD REGULATION, THREE TEMPERATURE
FIGURE 10. LOAD TRANSIENT (ΔILOAD = ±1mA)
6
5
6
5
4
V
IN
4
V
IN
3
3
2
2
1
1
V
1µF
V
= 0.1µF
OUT
OUT
0
0
-1
-1
0
50 100 150 200 250 300 350 400 450 500 550
TIME (µs)
0
50 100 150 200 250 300 350 400 450 500 550
TIME (µs)
FIGURE 11. TURN ON TIME WITH 0.1µF
FIGURE 12. TURN ON TIME WITH 1µF
100
10
0
-20
C
= 1nF
L
100nF
C
= 10nF
L
1
-40
1µF
0.1
-60
C
= 10µF
L
0.01
0.001
0.0001
-80
C
= 1µF
L
-100
-120
C
= 100nF
100
L
10
1k
10k
100k
1M
10M
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 13. ZOUT vs FREQUENCY (COMP = 0.01µF)
FIGURE 14. PSRR AT DIFFERENT CAPACITIVE LOADS
FN6993.3
November 21, 2012
7
ISL21090
Typical Performance Curves (ISL21090-1.25V)(Continued)
-30
-35
-40
-45
-50
-55
-60
-65
100
90
80
70
60
50
40
30
20
10
0
-40°C
+125°C
+25°C
-40°C
+25°C
+125°C
3.7
8.7
13.7
18.7
(V)
23.7
28.7
33.7
3.7
8.7
13.7
18.7
(V)
23.7
28.7
33.7
V
V
IN
IN
FIGURE 15. SHORT CIRCUIT TO GND
FIGURE 16. SHORT CIRCUIT TO VIN
X = 1s/DIV
Y = 0.5µV/DIV
1.2502
1.2500
1.2498
1.2496
1.2494
1.2492
1.2490
+25°C
-40°C
+85°C
3.7
8.7
13.7
18.7
23.7
28.7
33.7
V
(V)
IN
FIGURE 17. VOUT vs NOISE, 0.1Hz TO 10Hz
FIGURE 18. DROPOUT WITH -10mA LOAD
FN6993.3
November 21, 2012
8
ISL21090
Typical Performance Curves (ISL21090-2.5)
1300
1200
1100
1000
900
1000
980
960
940
920
900
880
UNIT 3
+125°C
+25°C
UNIT 1
800
UNIT 2
700
-40°C
600
4
9
14
19
24
29
34
39
4
9
14
19
24
(V)
29
34
39
V
V
(V)
IN
IN
FIGURE 19. IIN vs VIN, THREE UNITS
FIGURE 20. IIN vs VIN, THREE TEMPERATURES
2.500390
2.500290
2.500190
2.500090
2.499990
2.499890
2.499790
2.499690
2.500200
2.500000
2.499800
2.499600
2.499400
2.499200
2.499000
2.498800
UNIT 1
+25°C
+125°C
-40°C
UNIT 2
UNIT 3
3
6
9
12 15 18 21 24 27 30 33 36 39
(V)
4
9
14
19
24
(V)
29
34
39
V
V
IN
IN
FIGURE 21. LINE REGULATION, THREE UNITS
FIGURE 22. LINE REGULATION, THREE TEMPERATURES
30
20
10
30
20
10
CL = 100nF
CL = 1nF
0
0
-10
-20
-30
-10
-20
-30
0
10
20
30
40
50
60
70
80
90
100
0
10
20
30
40
50
60
70
80
90
100
TIME (µs)
TIME (µs)
FIGURE 23. LINE TRANSIENT WITH 1nF LOAD (ΔVIN = ±500mV)
FIGURE 24. LINE TRANSIENT WITH 100nF LOAD (ΔVIN = ±500mV)
FN6993.3
November 21, 2012
9
ISL21090
Typical Performance Curves (ISL21090-2.5)(Continued)
6
30
20
4
+25°C
10
CL = NO LOAD
2
0
0
-40°C
-10
-20
-30
-40
-2
-4
-6
CL = 100nF
CL = 1µF
100
+125°C
15
-25
-20
-15
-10
-5
0
5
10
20
0
20
40
60
80
120
(SOURCING)
I
(mA)
(SINKING)
TIME (µs)
LOAD
FIGURE 25. LOAD REGULATION, THREE TEMPERATURES
FIGURE 26. LOAD TRANSIENT (ΔILOAD = ±1mA)
6
5
6
5
4
4
VIN
VIN
3
2
3
2
CL = 1µF
CL = 0.1µF
1
1
0
0
-1
-1
0
50
100
150
200
250
300
350
400
0
50
100
150
200
250
300
350
400
TIME (µs)
TIME (µs)
FIGURE 27. TURN-ON TIME WITH 0.1µF
FIGURE 28. TURN-ON TIME WITH 1µF
0
-20
1000
100
10
CL = NO LOAD
CL = 10nF
CL = 100nF
CL = 10nF
-40
CL = 100nF
-60
CL = 1nF
-80
1
CL = 1nF
-100
-120
-140
0.1
0.01
CL = NO LOAD
10
100
1k
10k
100k
1M
10M
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 30. PSRR AT DIFFERENT CAPACITIVE LOADS
FIGURE 29. ZOUT vs FREQUENCY
FN6993.3
November 21, 2012
10
ISL21090
Typical Performance Curves (ISL21090-2.5)(Continued)
90
80
70
60
50
40
30
-30
-35
-40
-45
-50
-55
-60
-65
-40°C
+125°C
+25°C
+25°C
-40°C
+125°C
3
8
13
18
23
28
33
38
3
8
13
18
23
28
33
38
V
(V)
IN
V
(V)
IN
FIGURE 32. SHORT-CIRCUIT TO VIN
FIGURE 31. SHORT-CIRCUIT TO GND
X = 10s/DIV
Y = 1µV/DIV
2.5010
2.5005
2.5000
2.4995
2.4990
2.4985
2.4980
TYPICAL TEMPERATURE
COEFFICIENT CURVE FOR 10 UNITS
-55 -35 -15
5
25
45
65
85
105 125 145
TEMPERATURE (°C)
FIGURE 33. VOUT vs TEMPERATURE, 10 UNITS
FIGURE 34. VOUT vs NOISE, 0.1Hz TO 10Hz
2.5000
2.4998
2.4996
2.4994
2.4992
2.4990
2.4988
50
40
30
20
10
0
+25°C
+85°C
-10
-20
-40°C
-30
0
0
5
10
15
20
25
30
35
40
500
1000
1500
2000
2500
3000
VIN (V)
TIME (Hrs)
FIGURE 35. DROPOUT WITH -10mA LOAD
FIGURE 36. LONG TERM STABILITY
FN6993.3
November 21, 2012
11
ISL21090
Typical Performance Curves (ISL21090-5.0)
1150
1100
1050
1000
950
1300
1200
1100
1000
900
UNIT 1
+125°C
+25°C
UNIT 2
800
-40°C
27
900
700
UNIT 3
27
850
600
7
12
17
22
(V)
32
37
7
12
17
22
(V)
32
37
V
IN
V
IN
FIGURE 37. IIN vs VIN, THREE UNITS
FIGURE 38. IIN vs VIN, THREE TEMPERATURES
5.00100
5.00050
5.00000
4.99950
4.99900
4.99850
4.99800
4.99750
4.99700
5.00070
5.00060
5.00050
5.00040
5.00030
5.00020
5.00010
5.00000
4.99990
4.99980
4.99970
+25°C
UNIT 1
UNIT 2
-40°C
+125°C
UNIT 3
7
12
17
22
(V)
27
32
37
7
12
17
22
(V)
27
32
37
V
V
IN
IN
FIGURE 39. LINE REGULATION, THREE UNITS
FIGURE 40. LINE REGULATION, THREE TEMPERATURES
30
20
10
0
30
20
10
C
= 100nF
C
= 1nF
L
L
0
-10
-20
-10
-20
-30
-30
0
10
20
30
40
50
60
70
80
90
100
0
10
20
30
40
50
60
70
80
90
100
TIME (µs)
TIME (µs)
FIGURE 42. LINE TRANSIENT WITH 100nF LOAD (ΔVIN = ±500mV)
FIGURE 41. LINE TRANSIENT WITH 1nF LOAD (ΔVIN = ±500mV)
FN6993.3
November 21, 2012
12
ISL21090
Typical Performance Curves (ISL21090-5.0)(Continued)
400
10
8
200
+25°C
6
C
L
= 100nF
L
0
4
C
= 1µF
-200
-400
-600
-800
-1000
-1200
2
0
-2
-4
-6
-8
-10
-40°C
+125°C
-15
-20
-10
-5
(mA)
0
5
10
0
20
40
60
80
100 120 140 160 180 200
SOURCING
I
SINKING
TIME (µs)
LOAD
FIGURE 43. LOAD REGULATION, THREE TEMPERATURES
FIGURE 44. LOAD TRANSIENT (ΔILOAD = ±1mA)
12
10
12
10
8
V
V
IN
IN
8
6
6
4
4
C
= 0.1µF
L
C
= 1µF
L
2
2
0
0
-2
-2
0
50
100
150
200
TIME (µs)
250
300
350
400
0
50
100
150
200
TIME (µs)
250
300
350
400
FIGURE 45. TURN-ON TIME WITH 0.1µF
FIGURE 46. TURN-ON TIME WITH 1µF
1000
100
10
0
C
= 1nF
= 0
L
C
-20
-40
L
C
= 0
L
C
= 10nF
L
C
= 100nF
L
C
= 10nF
L
-60
1
-80
C
= 1nF
L
C
= 100nF
L
0.1
0.01
-100
-120
10
100
1k
10k
100k
1M
10M
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 47. ZOUT vs FREQUENCY
FIGURE 48. PSRR AT DIFFERENT CAPACITIVE LOADS
FN6993.3
November 21, 2012
13
ISL21090
Typical Performance Curves (ISL21090-5.0)(Continued)
-20
-30
-40
-50
-60
-70
-80
100
90
80
70
60
50
40
30
20
-40°C
+125°C
+25°C
+25°C
+125°C
-40°C
17
7
12
22
(V)
27
32
37
7
12
17
22
(V)
27
32
37
V
V
IN
IN
FIGURE 50. SHORT-CIRCUIT TO VIN
FIGURE 49. SHORT-CIRCUIT TO GND
5
4
5.10
5.05
5.00
4.95
4.90
4.85
4.80
3
2
1
0
-1
-2
-3
-4
-5
+125°C
+25°C
-40°C
0
1
2
3
4
5
6
7
8
9
10
6.00 6.10 6.20 6.30 6.40 6.50 6.60 6.70 6.80 6.90 7.00
(V)
V
TIME (s)
IN
FIGURE 51. VOUT vs NOISE, 0.1Hz TO 10Hz
FIGURE 52. DROPOUT WITH -10mA LOAD
FN6993.3
November 21, 2012
14
ISL21090
Turn-On Time
Normal turn-on time is typically 150µs, as shown in Figure 28.
The circuit designer must take this into account when looking at
power-up delays or sequencing.
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 4.6µVP-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 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.
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.
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.
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.
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.
FN6993.3
November 21, 2012
15
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
FN6993.3
CHANGE
August 22, 2012
Added 5.0V option “Typical Performance Curves” table to page 12.
Removed 7.5V and 10V option Electrical Specs
May 1, 2012
March 5, 2012
June 8, 2011
FN6993.2
FN6993.1
FN6993.0
Added 5.0V option “Electrical Specifications” table to page 4.
Added 7.5V option “Electrical Specifications” table to page 5.
Added 10.0V option “Electrical Specifications” table to page 5.
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.
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
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/product_tree
Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted
in the quality certifications found at www.intersil.com/design/quality
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
FN6993.3
November 21, 2012
16
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
0.175 ± 0.075
SIDE VIEW “A
0.10 C
0.63 ±0.23
DETAIL "A"
(0.60)
(1.27)
NOTES:
(1.50)
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
(5.40)
4. Dimension does not include interlead flash or protrusions.
Interlead flash or protrusions shall not exceed 0.25mm per side.
The pin #1 identifier may be either a mold or mark feature.
Reference to JEDEC MS-012.
5.
6.
TYPICAL RECOMMENDED LAND PATTERN
FN6993.3
November 21, 2012
17
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