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ISL21440 Scheda tecnica(PDF) 11 Page - Intersil Corporation

Il numero della parte ISL21440
Spiegazioni elettronici  Micropower Voltage Reference with Comparator
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Produttore elettronici  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL21440 Scheda tecnica(HTML) 11 Page - Intersil Corporation

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ISL21440
11
FN6532.2
February 23, 2011
Functional Description
Device Power
The ISL21440 device has a single positive supply pin, V+, and
two other supply pins, V- and GND. Normally for single supply
applications the V- pin is tied to system ground as well as the
GND pin. The separate ground pin allows the comparator to be
powered by split supplies from ±1.0V to ±5.5V. Note that the
minimum supply voltage will be 0.8V above the comparator
maximum input level for accurate operation.
Comparator Section
The comparator inputs can swing from the negative supply (GND
pin) to within 0.8V of the positive supply (V+). Alternatively, with
the comparator input set at the 1.182V reference level, the
minimum input voltage for accurate operation is 2.0V. If the
inputs are expected to see voltage levels above V+ or below
ground, they should be clamped with low leakage Schottky
diodes.
The CMOS output swings essentially from the GND potential to
V+ potential, depending on load current. If loads in excess of
1mA are expected, then a 0.1µF decoupling capacitor at the V+
pin should be added.
Voltage Reference Section
The voltage reference is a micropower FGA reference and is set
to 1.182V ±0.5% at the factory. The reference output can source
up to 2mA but the sink capability is very limited at only 10µA,
maximum. Small value capacitors, up to 10nF, can be used on
the reference output to lower noise if desired.
Applications Information
Handling and Board Mounting
FGA references provide excellent initial accuracy and low
temperature drift at the expense of very little power drain. There
are some precautions to take to insure this accuracy is not
compromised. Excessive heat during solder reflow can cause
excessive initial accuracy drift, so the recommended +260°C
max temperature profile should not be exceeded. Expect up to
1mV drift from the solder reflow process.
FGA references are susceptible to excessive X-radiation like that
used in PC board manufacturing. Initial accuracy can change
FIGURE 23. OUTPUT RESPONSE TIME vs INPUT OVERDRIVE
(tPLH)
FIGURE 24. POWER-UP/DOWN OUTPUT RESPONSE
(V+ = 5V, IN+ = V+, IN- = VREF)
FIGURE 25. POWER-UP/DOWN OUTPUT RESPONSE (V+ = 3V, IN+ = V+, IN- = VREF)
Typical Performance Curves (Continued)
20
45
70
95
120
145
170
195
220
245
270
10
20
30
40
50
60
70
80
90
100 110 120
INPUT VOLTAGE (mV)
3V
5V
-0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
TIME (ms)
V+
OUT
-0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
V+
OUT
TIME (ms)


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