MAX5491UA07538-T 查看數據表（PDF） - Maxim Integrated
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MAX5491UA07538-T Datasheet PDF : 7 Pages
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Precision-Matched Resistor-Divider in SOT23
P2
IN
A = VOUT = − R1
VIN
R2
OUT
P3
MAX5491
P1
R2
R1
Typical Applications
A = VOUT = 1 + R1
IN
VIN
R2
OUT
P3
P2
MAX5491
P1
R2
R1
Figure 1. Inverting Amplifier Configuration
Figure 2. Noninverting Amplifier Configuration
IN
A = VOUT = R2
VIN
R1 + R2
IN
P1
A = VOUT = R2
VIN
R1 + R2
P1
MAX5491
R1
R2
P3
OUT
MAX5491
R1
P3
R2
OUT
P2
P2
Figure 3. Buffered Attenuator
Applications Information
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:
PDISS
= (VMAX )2
R
(50V)2
=
30kΩ
= 83.3mW
Figure 4. Attenuator with Buffer
The thermal resistance from junction to ambient, θJ-A,
for a 3-pin SOT23 package is 141°C/W. Calculate the
resulting temperature rise as:
∆T = 83.3mW x 141°C/W = 11.7°C
If the ratio temperature coefficient is 2ppm/°C (typ), the
total error introduced by self-heating is:
11.7°C x 2ppm/°C = 23.4ppm
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