ISL60002CIH330Z-TK Intersil, ISL60002CIH330Z-TK Datasheet - Page 33

• Manufacturer Part Number: ISL60002CIH330Z-TK
• Description: IC VOLT REF FGA LV 3.0V SOT-23
• Manufacturer: Intersil
• Series: FGA™r

Specifications of ISL60002CIH330Z-TK

• Reference Type: Series
• Voltage - Output: 3V
• Tolerance: ±2.5mV
• Temperature Coefficient: 20ppm/°C
• Voltage - Input: 3.2 ~ 5.5 V
• Number Of Channels: 1
• Current - Quiescent: 900nA
• Current - Output: 7mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
• Rohs Compliant: YES
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Cathode: -
• Other names: ISL60002CIH330Z-TKTR

Board Assembly Considerations
FGA references provide high accuracy and low temperature drift
but some PC board assembly precautions are necessary. Normal
Output voltage shifts of 100µV to 1mV can be expected with Pb-
free reflow profiles. Precautions should be taken to avoid
excessive heat or extended exposure to high reflow
temperatures, which may reduce device initial accuracy.
Post-assembly x-ray inspection may also lead to permanent
changes in device output voltage and should be minimized or
avoided. If x-ray inspection is required, it is advisable to monitor
the reference output voltage to verify excessive shift has not
occurred. If large amounts of shift are observed, it is best to add
an X-ray shield consisting of thin zinc (300µm) sheeting to allow
clear imaging, yet block x-ray energy that affects the FGA
reference.
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, however, 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, thus 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. 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
P
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 10 times the center frequency. Figure 117
also shows the noise in the 10kHz to 1MHz band can be reduced
to about 50µV
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 118 is
with no capacitance on the output, as shown in Figure 117.
P-P
P-P
. This is shown in the plot in the Typical
using a 0.001µF capacitor on the output. Noise
33
ISL60002
P-
recommended. This network reduces noise significantly over the
full bandwidth. As shown in Figure 117, noise is reduced to less
than 40µV
0.01µF capacitor and a 2kΩ resistor in series with a 10µF
capacitor.
Turn-On Time
The ISL60002 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 Figure 119. 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.
V
IN
250
200
150
100
300
400
350
= 3.0V
50
0
0.1µF
1
P-P
FIGURE 118. NOISE REDUCTION NETWORK
from 1Hz to 1MHz using this network with a
10µF
FIGURE 117. NOISE REDUCTION
CL = 0
CL = 0.001µF
CL = 0.1µF
CL = 0.01µF AND 10µF + 2kΩ
10
VOUT = 2.50V
ISL60002-25
100
GND
V
IN
V
O
1k
0.01µF
December 16, 2010
10k
FN8082.17
2kΩ
10µF
100k