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ISL21080
I SET =
+8V TO 28V
V OUT
R SET
I L = I SET + IR SET
Turn-On Time
The ISL21080 devices have ultra-low supply current and
thus, the time to bias-up internal circuitry to final values
will be longer than with higher power references. Normal
turn-on time is typically 7ms. This is shown in Figure 38.
Since devices can vary in supply current down to
V IN
0.01μF
V OUT
ISL21080-1.5
V OUT = 1.5V
Z OUT > 100M Ω
R SET
10k Ω
0.1%
10ppm/°C
>300nA, turn-on time can last up to about 12ms. Care
should be taken in system design to include this delay
before measurements or conversions are started.
Temperature Coefficient
GND
I SY ~ 0.31μA
I SET
IL AT 0.1% ACCURACY
~150.3μA
FIGURE 38. ISL21080 USED AS A LOW COST
PRECISION CURRENT SOURCE
Noise Performance and Reduction
The output noise voltage in a 0.1Hz to 10Hz bandwidth is
typically 30μV P-P . This is shown in the plot in the “Typical
Performance Characteristics Curves” which begin on
page 10. The noise measurement is made with a
bandpass filter 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 at 12.6Hz to create a filter with a
9.9Hz bandwidth. Noise in the 10kHz to 1MHz bandwidth
is approximately 400μV P-P with no capacitance on the
output, as shown in Figure 39. These noise
measurements are made with a 2 decade bandpass filter
made of a 1-pole high-pass filter with a corner frequency
at 1/10 of the center frequency and 1-pole low-pass filter
with a corner frequency at 10 times the center frequency.
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, (V HIGH -
V LOW ), and divide by the temperature extremes of
measurement (T HIGH – T LOW ). The result is divided by
the nominal reference voltage (at T = +25°C) and
multiplied by 10 6 to yield ppm/°C. This is the “Box”
method for specifying temperature coefficient.
400
CL = 0
350 CL = 0.001μF
CL = 0.1μF
300 CL = 0.01μF AND 10μF + 2k Ω
250
200
150
100
50
Figure 39 also shows the noise in the 10kHz to 1MHz
band can be reduced to about 50μV P-P using a 0.001μF
capacitor on the output. Noise in the 1kHz to 100kHz
band can be further reduced using a 0.1μF capacitor on
0
1
10 100 1k 10k
FIGURE 39. NOISE REDUCTION
100k
the output, but noise in the 1Hz to 100Hz band increases
due to instability of the very low power amplifier with a
0.1μF capacitance load. For load capacitances above
0.001μF, the noise reduction network shown in Figure 40
is recommended. This network reduces noise
significantly over the full bandwidth. As shown in
Figure 39, noise is reduced to less than 40μV P-P from
1Hz to 1MHz using this network with a 0.01μF capacitor
V IN = 3.0V
0.1μF
10μF
V IN
V O
ISL21080
GND
0.01μF
2k Ω
and a 2k Ω resistor in series with a 10μF capacitor.
16
10μF
FIGURE 40. NOISE REDUCTION NETWORK
FN6934.4
May 25, 2010
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