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ISL21032
If a device is expected to pass through luggage X-ray
machines numerous times, it is advised to mount a 2-layer
(minimum) PC board on the top, and along with a ground
plane underneath will effectively shield it from from 50 to 100
passes through the machine. Since these machines vary in
X-ray dose delivered, it is difficult to produce an accurate
maximum pass recommendation.
Noise Performance and Reduction
The output noise voltage in a 0.1Hz to 10Hz bandwidth is
typically 30μV P-P . 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. Wideband noise is reduced by adding capacitor
to the output, but the value should be limited to 1nF or less
to insure stability.
Temperature Drift
The limits stated for output accuracy over-temperature are
governed by the method of measurement. For the -40°C to
130°C temperature range, measurements are made at
+25°C and the two extremes. This measurement method
combined with the fact that FGA references have a fairly
linear temperature drift characteristic insures that the limits
stated will not be exceeded over the temperature range.
V IN = 5V
R = 200 Ω
2N2905
V IN
ISL21032
V OUT
0.6V/50mA
0.001μF
GND
FIGURE 15. PRECISION LOW NOISE, LOW DRIFT, 0.6V, 50mA REFERENCE
6
FN6239.2
September 28, 2009
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