X60003B-50_06 Datasheet, PDF (11/14 Pages) Intersil Corporation – Precision 5.0V SOT-23 FGA™ Voltage Reference

X60003B-50, X60003C-50, X60003D-50
load capacitances above .001µF the noise reduction
network shown in fig. 3 is recommended. This network
reduces noise sig-nificantly over the full bandwidth. As
shown in fig. 2, noise is reduced to less than 40µVp-p
from 1Hz to 1MHz using this network with a .01µF
capacitor and a 2kΩ resistor in series with a 10µF
capacitor.
Figure 2.
400
350
300
250
200
150
100
50
0
1
X60003x-50 NOISE REDUCTION
CL = 0
CL = .001µF
CL = .1µF
CL = .01µF & 10µF + 2kΩ
10
100
1000 10000 100000
Figure 3.
V_IN = 6.5V
.1µF
10µF
V_IN
V_O
X60003x-50
GND
.01µF
2kΩ
10µF
Turn-On Time
The X60003x-50 device has ultra-low supply current
and thus the time to bias up internal circuitry to final
values will be longer than with higher power refer-
ences. 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.
X60003 TURN-ON TIME (25°C)
(3 Representative Units)
7
6
I_IN = 500nA
5
I_IN = 700nA
4
3
I_IN = 350nA
2
1
0
0
2
4
6
8
10 12
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.
11
FN8137.1
May 2, 2006