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Ultra Low Noise, Precision Voltage Reference
ISL21090
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 1.0μV P-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) . . . . . . . . . . . . 1.0μV P-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”
VIN
1
DNC
DNC
8
2.5010
TYPICAL TEMPERATURE
COEFFICIENT CURVE FOR 10 UNITS
10μF
0.1μF
2
3
VIN
COMP
DNC
VOUT
7
6
VREF
2.5005
2.5000
4
GND
TRIM
5
0.1μF
2.4995
SERIAL CLOCK
CHIP SELECT
VDD
SCLK
CSb
VREF
OUTxS
OUTxF
DACOUTx
2.4990
2.4985
SERIAL DATA I/O
SDIO
DAC
GND
2.4980
-55
-35
-15
5
25 45 65
TEMPERATURE (°C)
85
105
125
145
FIGURE 1. ISL21090 TYPICAL APPLICATION DIAGRAM
FIGURE 2. V OUT vs TEMPERATURE (2.5V OPTION)
February 27, 2013
FN6993.5
1
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.
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