X60008C-25 INTERSIL [Intersil Corporation], X60008C-25 Datasheet - Page 8

• Manufacturer Part Number: X60008C-25
• Description: Precision 2.5V FGA Voltage Reference
• Manufacturer: INTERSIL [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
= 6.5V
250
200
150
100
300
400
350
50
.1µF
0
1
10µF
X60008-25 NOISE REDUCTION
10
CL = 0
CL = .001µF
CL = .1µF
CL = .01µF & 10µF + 2kΩ
X60008-25
100
GND
V
IN
8
V
O
1000
.01µF
10000
100000
2kΩ
10µF
X60008B-25
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
V
LOW
6
5
4
3
2
1
0
-1
), and divide by the temperature extremes of
6
to yield ppm/°C. This is the “Box” method.
1
HIGH
690 nA
X60008 TURN-ON TIME (25°C)
- T
3
LOW
320 nA
TIME (mSec)
V
520 nA
). The result is divided by
IN
5
V
OUT
7
March 15, 2005
HIGH
FN8140.0
9
-