X60003CIG3-50 Intersil, X60003CIG3-50 Datasheet - Page 13

• Manufacturer Part Number: X60003CIG3-50
• Description: IC VOLT REF 2.5MV 20PPM SOT-23
• Manufacturer: Intersil
• Series: FGA™r

Specifications of X60003CIG3-50

• Reference Type: Series
• Voltage - Output: 5V
• Tolerance: ±2.5mV
• Temperature Coefficient: 20ppm/°C
• Voltage - Input: 5.1 ~ 9 V
• Number Of Channels: 1
• Current - Quiescent: 900nA
• Current - Output: 10mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Cathode: -

Special Applications Considerations
In addition to post-assembly examination, there are also
other X-ray sources that may affect the FGA reference
long term accuracy. Airport screening machines contain
X-rays and will have a cumulative effect on the voltage
reference output accuracy. Carry-on luggage screening
uses low level X-rays and is not a major source of output
voltage shift, although if a product is expected to pass
through that type of screening over 100 times it may
need to consider shielding with copper or aluminum.
Checked luggage X-rays are higher intensity and can
cause output voltage shift in much fewer passes, so
devices expected to go through those machines should
definitely consider shielding. Note that just two layers of
1/2 ounce copper planes will reduce the received dose by
over 90%. The leadframe for the device which is on the
bottom also provides similar shielding.
If a device is expected to pass through luggage X-ray
machines numerous times, it is advised to mount a
2-layer (minimum) PC board on the top, and along with a
ground plane underneath will effectively shield it from
from 50 to 100 passes through the machine. Since these
machines vary in X-ray dose delivered, it is difficult to
produce an accurate maximum pass recommendation.
Noise Performance and Reduction
The output noise voltage in a 0.1Hz to 10Hz bandwidth is
typically 30µV
Performance Curves” on page 8 and 9. The noise
measurement is made with a bandpass filter made of a
1-pole high-pass filter with a corner frequency at 0.1Hz
and a 2-pole low-pass filter with a corner frequency at
12.6Hz to create a filter with a 9.9Hz bandwidth. Noise in
the 10kHz to 1MHz bandwidth is approximately 400µV
with no capacitance on the output, as shown in Figure 34.
These noise measurements are made with a 2 decade
bandpass filter made of a 1-pole high-pass filter with a
corner frequency at 1/10 of the center frequency and
1-pole low-pass filter with a corner frequency at 10x the
center frequency. Figure 34 also shows the noise in the
10kHz to 1MHz band can be reduced to about 50µV
using a 0.001µF capacitor on the output. Noise in the
1kHz to 100kHz band can be further reduced using a
0.1µF capacitor on the output, but noise in the 1Hz to
100Hz band increases due to instability of the very low
power amplifier with a 0.1µF capacitance load. For load
capacitances above 0.001µF, the noise reduction network
shown in Figure 35 is recommended. This network
reduces noise significantly over the full bandwidth.
Figure 35 shows that noise is reduced to less than 40µV
from 1Hz to 1MHz using this network with a 0.01µF
capacitor and a 2kΩ resistor in series with a 10µF
capacitor.
P-P
. This is shown in the plot in the “Typical
13
P-P
X60003
P-P
P-P
Turn-On Time
The X60003 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 references. Normal
turn-on time is typically 7ms. This is shown in the graph,
Figure 32. 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.
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
and divide by the temperature extremes of measurement
(T
reference voltage (at T = +25°C) and multiplied by 10
yield ppm/°C. This is the “Box” method for determining
temperature coefficient.
V
HIGH
IN
= 6.5V
400
350
300
250
200
150
100
50
FIGURE 35. NOISE REDUCTION NETWORK
0.1µF
0
- T
FIGURE 34. X60003 NOISE REDUCTION
1
LOW
CL = 0.01µF AND 10µF + 2kΩ
). The result is divided by the nominal
10µF
10
100
X60003
GND
V
IN
CL = 0.1µF
V
O
1k
0.01µF
CL = 0.001µF
CL = 0
10k
HIGH
March 21, 2011
- V
FN8137.3
LOW
100k
2kΩ
10µF
6
to
),