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LT1460EIN8-10 Datasheet(PDF) 6 Page - Linear Technology

Part # LT1460EIN8-10
Description  Micropower Precision Series Reference
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1460EIN8-10 Datasheet(HTML) 6 Page - Linear Technology

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6
LT1460-10
APPLICATIONS INFORMATION
current step of 1mA or 100
µA for RL = 1k or RL = 10k.
Figure 2 shows the response of the reference with no load
capacitance.
The reference settles to 10mV (0.1%) in 0.4
µs for a 100µA
pulse and to 0.1% in 0.8
µs with a 1mA step. When load
capacitance is greater than 0.01
µF, the reference begins to
ring due to the pole formed with the output impedance.
Figure 3 shows the response of the reference to a 1mA and
100
µA load with a 0.01µF load capacitor.
Fast Turn-On
It is recommended to add a 0.1
µF or larger input capacitor
to the input pin of the LT1460-10. This helps stability with
large load currents and speeds up turn-on. The LT1460-10
can start in 10
µs, but it is important to limit the dv/dt of the
input. Under light load conditions and with a very fast
input, internal nodes overslew and this requires finite
recovery time. Figure 4 shows the result of no bypass
capacitance on the input and no output load. In this case
the supply dv/dt is 12.5V in 30ns which causes internal
overslew, and the output does not bias to 10V until 60
µs.
A 0.1
µF input capacitor guarantees the part always starts
quickly as shown in Figure 5.
Figure 3. CL = 0.01µF
10
µs/DIV
1460-10 F03
2
µs/DIV
1460-10 F02
10V
9V
Figure 2. CL = 0
10V
9V
RL = 10k
RL = 1k
20
µs/DIV
1460-5 F04
Figure 5. CIN = 0.1µF
12.5V
20
µs/DIV
1460-10 F04
Figure 4. CIN = 0
Figure 1. Response Time Test Circuit
VOUT
VOUT
VGEN
RL = 10k
RL = 1k
VGEN
VOUT
VOUT
VIN
VOUT
0V
0V
0V
12.5V
0V
VIN
VOUT
LT1460-10
RL
VOUT
VGEN
1460-10 F01
CIN
0.1
µF
10V
9V
CL
VIN = 12.5V


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