X60008E-41_06 Datasheet, PDF (8/10 Pages) Intersil Corporation – Precision 4.096V FGA™ Voltage

X60008E-41
400
350
300
250
FIGURE 2.
X60008-41 NOISE REDUCTION
CL = 0
CL = .001µF
CL = .1µF
CL = .01µF & 10µF + 2kΩ
200
150
100
50
0
1
10
100
1000 10000 100000
FIGURE 3.
V_IN = 5.0V
.1µF
10µF
V_IN
V_O
X60008-41
GND
.01µF
2kΩ
10µF
Turn-On Time
The X60008 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 the graph, Figure 4.
Since devices can vary in supply current down to 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.
FIGURE 4.
X60008 TURN-ON TIME (25°C)
(3 Representative Units)
6
5
V_IN
I_IN = 700nA
4
3
I_IN = 520nA
2
I_IN = 360nA
1
0
-1
1
3
5
7
9
11
TIME (mSec)
Temperature Coefficient
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 10⁶ to yield
ppm/°C. This is the “Box” method for determining
temperature coefficient.
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8
FN8144.1
June 27, 2006