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ISL21080 Scheda tecnica(PDF) 6 Page - Intersil Corporation

Il numero della parte ISL21080
Spiegazioni elettronici  300nA NanoPower Voltage References
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Produttore elettronici  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL21080 Scheda tecnica(HTML) 6 Page - Intersil Corporation

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FN6934.0
July 28, 2009
Applications Information
FGA Technology
The ISL21080 series of voltage references use the floating gate
technology to create references with very low drift and supply
current. Essentially, the charge stored on a floating gate cell is
set precisely in manufacturing. The reference voltage output
itself is a buffered version of the floating gate voltage. The
resulting reference device has excellent characteristics which
are unique in the industry: very low temperature drift, high initial
accuracy, and almost zero supply current. Also, the reference
voltage itself is not limited by voltage bandgaps or zener
settings, so a wide range of reference voltages can be
programmed (standard voltage settings are provided, but
customer-specific voltages are available).
The process used for these reference devices is a floating
gate CMOS process, and the amplifier circuitry uses CMOS
transistors for amplifier and output transistor circuitry. While
providing excellent accuracy, there are limitations in output
noise level and load regulation due to the MOS device
characteristics. These limitations are addressed with circuit
techniques discussed in other sections.
Nanopower Operation
Reference devices achieve their highest accuracy when
powered up continuously, and after initial stabilization has
taken place. This drift can be eliminated by leaving the
power on continuously.
The ISL21080 is the first high precision voltage reference
with ultra low power consumption that makes it possible to
leave power on continuously in battery operated circuits. The
ISL21080 consumes extremely low supply current due to the
proprietary FGA technology. Supply current at room
temperature is typically 350nA, which is 1 to 2 orders of
magnitude lower than competitive devices. Application
circuits using battery power will benefit greatly from having
an accurate, stable reference, which essentially presents no
load to the battery.
In particular, battery powered data converter circuits that
would normally require the entire circuit to be disabled when
FIGURE 13. ZOUT vs FREQUENCY
FIGURE 14. PSRR vs FREQUENCY
Typical Performance Characteristics Curves
VOUT = 1.5V, VIN = 3.0V, IOUT = 0mA, TA = +25°C unless otherwise
specified. (Continued)
0
20
40
60
80
100
120
140
160
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
1nF
10nF
100nF
NO LOAD
-70
-60
-50
-40
-30
-20
-10
0
10
100
1k
10k
100k
FREQUENCY (Hz)
1M
NO LOAD
1nF
10nF
100nF
High Current Application
FIGURE 15. DIFFERENT VIN AT ROOM TEMPERATURE
FIGURE 16. DIFFERENT VIN AT HIGH TEMPERATURE
1.492
1.494
1.496
1.498
1.500
1.502
0
5
10
15
20
25
30
ILOAD (mA)
35
VIN = 5V
VIN = 3.5V
VIN = 3.3V
1.492
1.494
1.496
1.498
1.500
1.502
0
5
10
15
20
25
30
ILOAD (mA)
VIN = 5V
VIN = 3.5V
VIN = 3.3V
35
ISL21080


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