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ISL21080DIH310Z-TK View Datasheet(PDF) - Intersil

Part NameDescriptionManufacturer
ISL21080DIH310Z-TK 300nA NanoPower Voltage References Intersil
Intersil Intersil
ISL21080DIH310Z-TK Datasheet PDF : 17 Pages
First Prev 11 12 13 14 15 16 17
ISL21080
High Current Application
1.502
VIN = 5V
1.500
1.502
1.500
VIN = 5V
1.498
1.496
1.494
VIN = 3.5V
VIN = 3.3V
1.498
1.496
1.494
VIN = 3.5V
VIN = 3.3V
1.4920
5
10 15 20 25 30 35
ILOAD (mA)
FIGURE 15. DIFFERENT VIN AT ROOM TEMPERATURE
1.492
0
5
10
15 20 25 30 35
ILOAD (mA)
FIGURE 16. DIFFERENT VIN AT HIGH TEMPERATURE
(+85°C)
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 not in use can remain powered up between
conversions as shown in Figure 17. Data acquisition
circuits providing 12 bits to 24 bits of accuracy can
operate with the reference device continuously biased
with no power penalty, providing the highest accuracy
and lowest possible long term drift.
Other reference devices consuming higher supply
currents will need to be disabled in between conversions
to conserve battery capacity. Absolute accuracy will
suffer as the device is biased and requires time to settle
to its final value, or, may not actually settle to a final
value as power on time may be short. Table 1 shows an
example of battery life in years for ISL21080 in various
power on condition with 1.5µA maximum current
consumption.
TABLE 1. EXAMPLE OF BATTERY LIFE IN YEARS FOR
ISL21080 IN VARIOUS POWER ON
CONDITIONS WITH 1.5µA MAX CURRENT
BATTERY
RATING
(mAH)
50% DUTY
CONTINUOUS CYCLE
10% DUTY
CYCLE
40
3
6
30*
225
16.3*
32.6*
163*
NOTE: *Typical Li-ion battery has a shelf life of up to 10
years.
11
FN6934.2
October 14, 2009
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