x60008bi41 Intersil Corporation, x60008bi41 Datasheet - Page 11

• Manufacturer Part Number: x60008bi41
• Description: Ic Volt Ref 0.5mv 3ppm 8-soic
• Manufacturer: Intersil Corporation

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.
Figure 3.
V
IN
= 5.0V
250
200
150
100
300
400
350
50
.1µF
0
1
10µF
X60008-41 NOISE REDUCTION
10
CL = 0
CL = .001µF
CL = .1µF
CL = .01µF & 10µF + 2kΩ
X60008-41
100
GND
V
11
IN
V
O
1000
X60008B-41, X60008C-41, X60008D-41
.01µF
10000
100000
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. Nor-
mal turn-on time is typically 7ms. This is shown in the
graph, Figure 4. Since devices can vary in supply cur-
rent 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 conver-
sions are started.
Figure 4.
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
measurement (T
the nominal reference voltage (at T = 25°C) and multi-
plied by 10
for determining temperature coefficient.
V
LOW
6
5
4
3
2
1
0
-1
), and divide by the temperature extremes of
6
I
IN
1
to yield ppm/°C. This is the “Box” method
= 700nA
X60008 TURN-ON TIME (25°C)
HIGH
(3 Representative Units)
I
IN
3
= 360nA
- T
V
LOW
TIME (mSec)
IN
5
). The result is divided by
I
IN
7
= 520nA
9
May 24, 2006
FN8142.1
HIGH
11
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