LTC6102HVCDD View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC6102HVCDD' PDF : 26 Pages View PDF
LTC6102
LTC6102-1/LTC6102HV
Applications Information
the allowed output current. The gain is still controlled by
ROUT/RIN, so either gain or attenuation may be applied to
the input signal as it is translated to the output. Finally,
the input may be a voltage source rather than a sense
resistor, as shown in Figure 8. This circuit allows the
translation of a wide variety of input signals across the
entire supply range of the LTC6102 with only a tiny offset
error while retaining simple gain control set by ROUT/RIN.
Again, very large voltages may be sensed as long as RIN
is chosen so that IOUT does not exceed the allowed output
current. For example, VIN may be as large as 1V with RIN =
1k, or as large as 10V with RIN = 10k. For a 10V maximum
input and a 5V maximum output, RIN = 10k and ROUT = 5k
will allow the LTC6102HV to translate VIN to VOUT with a
common mode voltage of up to 100V. For the case where
a large input resistor is used, a similar resistor in series
with +IN will reduce error due to input bias current.
V+
RIN
VIN
+IN
VCM
V–
+–
–INS
–INF
V+
VREG
0.1µF
LTC6102
OUT
VOUT
ROUT
LTC6102 by effectively reducing the supply voltage to the
part by VD.
In addition, if the output of the LTC6102 is wired to a device
that will effectively short it to high voltage (such as through
an ESD protection clamp) during a reverse supply condi-
tion, the LTC6102’s output should be connected through
a resistor or Schottky diode (Figure 10).
Response Time
The LTC6102 is designed to exhibit fast response to inputs
for the purpose of circuit protection or signal transmission.
This response time will be affected by the external circuit
in two ways, delay and speed.
RSENSE
+IN
VBATT
V–
L
O
A
D
LTC6102
D1
R1
–INS 100Ω
–INF
V+
VREG 0.1µF
OUT
R2
4.99k
6102 F09
Figure 9. Schottky Prevents Damage During Supply Reversal
VBATT
VOUT
=
VIN
•
ROUT
RIN
6102 F08
Figure 8. Voltage Level-Shift Circuit
Reverse Supply Current
Some applications may be tested with reverse-polarity
supplies due to an expectation of this type of fault during
operation. The LTC6102 is not protected internally from
external reversal of supply polarity. To prevent damage
that may occur during this condition, a Schottky diode
should be added in series with V– (Figure 9). This will
limit the reverse current through the LTC6102. Note that
this diode will limit the low voltage performance of the
RSENSE
+IN
L
O
V–
A
D
LTC6102
D1
R1
–INS 100Ω
–INF
V+
VREG 0.1µF
R3
OUT
1k
R2
4.99k
ADC
6102 F10
Figure 10. Additional Resistor R3 Protects
Output During Supply Reversal
6102fe
18
For more information www.linear.com/LTC6102
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