MAX5490VC10000-T 查看數據表（PDF） - Maxim Integrated
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MAX5490VC10000-T Datasheet PDF : 8 Pages
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100kΩ Precision-Matched Resistor-Divider in
SOT23
Typical Operating Characteristics (continued)
(VP1-P2 = 10V, TA = +25°C, unless otherwise noted.)
SPECTRAL NOISE DENSITY
1000
RATIO 1:1
SIGNAL CONNECTED TO P2
P1 GROUNDED
VP1-P2 = 10V
100
VP1-P2 = 2V
THD+N RESPONSE
100
1:1 RATIO
10 20Hz TO 20kHz BANDPASS
1
0.1
0.01
0.001
10
1
10
100
1k
FREQUENCY (Hz)
0.0001
10
100
1k
10k
100k
FREQUENCY (Hz)
PIN
NAME
1
P1
R1 Connection Terminal
2
P2
R2 Connection Terminal
3
P3
Set-Point Connection Terminal
FUNCTION
Pin Description
Detailed Description
As shown in the Block Diagram, the MAX5490 consists
of two precision, low-ratio-drift resistors with an end-to-
end resistance of 100kΩ (R1 + R2). P3 is the set point
of the divider. The maximum working voltage of the
MAX5490 is 80V. This device offers a wide range of
resistance ratios (R1/R2) from 1:1 to 100:1 and is ideal
for precision operational amplifier gain/attenuation con-
trol. A maximum initial ratio accuracy of 0.035% and a
low 1ppm/°C ratio drift enhance system accuracy.
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
=
(80V)2
100kΩ
= 64mW
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 = 64mW x 141°C/W = 9.02°C
If the ratio temperature coefficient is 1ppm/°C (typ), the
total error introduced by self-heating is:
9.02°C x 1ppm/°C = 9.02ppm
4 _______________________________________________________________________________________
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