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10k ? Precision-Matched
Resistor-Divider in SOT23
Typical Applications
= ? 1
A =
V OUT
V IN
R
R 2
IN
A =
V OUT
V IN
= 1 +
R 1
R 2
P3
OUT
P3
OUT
IN
P2
MAX5492
P1
P2
MAX5492
P1
R 2
R 1
R 2
R 1
Figure 1. Inverting Amplifier Configuration
IN
Figure 2. Noninverting Amplifier Configuration
A =
V OUT
V IN
=
R 2
R 1 + R 2
IN
P1
A =
V OUT
V IN
=
R 2
R 1 + R 2
P1
MAX5492
R 1
MAX5492
R 1
P3
P3
OUT
R 2
OUT
R 2
P2
Figure 3. Buffered Attenuator
Self-Heating and Error
Applying a voltage across terminals P1 and P2 causes
the device to heat up due to power dissipation. In high-
voltage applications, consider the error in resistance-
ratio temperature coefficient caused by self-heating.
The worst-case self-heating occurs when the operating
voltage attains its maximum value. Approximate the
result of power dissipation under this condition as:
P2
Figure 4. Attenuator with Buffer
The thermal resistance from junction to ambient, θ J-A ,
for a 5-pin SOT23 package is 141°C/W. Calculate the
resulting temperature rise as:
? T = 160mW x 141°C/W = 22.5°C
If the ratio temperature coefficient is 1.5ppm/°C (typ),
the total error introduced by self-heating is:
22.5 ° C x 1.5ppm/ ° C = 33.75ppm
P DISS =
( V MAX ) 2
R
=
( 40 V ) 2
10 k ?
= 160 mW
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5
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