General Description
The MAX5492 precision resistor-divider consists of two accurately matched resistors with access to the ends and center of the divider. This device offers excellent resistance matching of 0.035% (A grade), 0.05% (B grade), and 0.1% (C grade). The MAX5492 includes an extremely low-resistance-ratio temperature drift of 1.5ppm/°C (typ) over -55°C to +125°C, and has an end-to-end resistance of 10k Ω. Resistance ratios from 1:1 to 10:1 are available. Five standard ratios are available (e Table 1), and custom ratios are also available upon request. To enhance device and system robustness, the MAX5492 features ±2kV Human Body Model electrostat-ic discharge (ESD) protection to ensure against real-world ESD events. The MAX5492 is ideal for precision gain-tting applications where tight resistance matching and low temperature drift are necessary.
The MAX5492 is available in a space-saving 5-pin SOT23 package, and is guaranteed over the military -55°C to +125°C temperature range.
Applications
Industrial Process Control Instrumentation Precision Gain Setting Medical Equipment Automatic Test Equipment Ba Stations
Features
♦Resistance Ratios from 1:1 to 10:1♦Custom Ratios Available Upon Request ♦Tight Initial Ratio Accuracy
0.035% (MAX5492A)0.05% (MAX5492B)0.1% (MAX5492C)
♦Low 1.5ppm/°C (typ) Resistor-Ratio-Drift (1.1:1)♦Up to 40V Operating Voltage Across Sum of R1and R2♦Tiny 5-Pin SOT23 Package抗击疫情手抄报
MAX5492
10k ΩPrecision-Matched Resistor-Divider in SOT23
________________________________________________________________Maxim Integrated Products 1
Pin Configuration
Ordering Information*
Block Diagram
19-3695; Rev 0; 5/05
For pricing, delivery, and ordering information,plea contact Maxim/Dallas Direct!at
1-888-629-4642, or visit Maxim’s website at
*See the How to Order ction for more details.
M A X 5492
10k ΩPrecision-Matched Resistor-Divider in SOT232
珍珠母的功效_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(T A = -55°C to +125°C, unless otherwi noted. Typical values are at T A = +25°C.) (Note 1)
Stress beyond tho listed under “Absolute Maximum Ratings” may cau permanent damage to the device. The are stress ratings only, and functional operation of the device at the or any other conditions beyond tho indicated in the operational ctions of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Voltage Between P1 ±50V Continuous Current into ±4.2mA Continuous Power Dissipation (T A = +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C).........571.4mW 5-Pin SOT23 (θJ-A ).....................................................141°C/W
Operating Temperature Range .........................-55°C to +125°C +150°C Storage -65°C to +150°C Lead Temperature (soldering, 10s).................................+3
00°C
Note 2:Testing conditions: T A = +25°C, V P1-P2= 10V and 40V.
Note 3:Resistance-ratio temperature coefficient is defined and is guaranteed by design, not production tested.Note 5:Resistance-ratio voltage coefficient is defined as and is guaranteed by design, not production tested.∆∆R R R R T 121
2⎛⎝⎜⎞⎠
⎟× ∆∆R R R R V 121
2
⎛⎝⎜⎞
⎠
⎟
× Note 4:
Note 6:Calculate bandwidth by using where C is C P3and R = . Note 7:
Calculated according to noi.
Note 8:In accordance with the military specification MIL-STD-202G method 308.
MAX5492
10kΩPrecision-Matched
Resistor-Divider in SOT23 _______________________________________________________________________________________3
NORMALIZED RESISTANCE-RATIO DRIFT
vs. TEMPERATURE
TEMPERATURE (°C)
R
A
T
I
O
D
R
I
F
T
(
p
p
m
)
95
65
-25535
-150
-100
-50
50
100
150
200
-200
-55125
NORMALIZED RESISTANCE-RATIO DRIFT
vs. TEMPERATURE
TEMPERATURE (°C)
R
A
T
I
O
D
R
I
F
T
(
菌种p
p
m
)
95
65
-25535
-400
-200
200
400
600
-600
-
55125
NORMALIZED RESISTANCE-RATIO DRIFT
vs. TEMPERATURE
TEMPERATURE (°C)
R
A
T
I
O
D
R
微笑中透露着疲惫I
F
T
(
p
p
m
)
95
65
-25535
-
200
-100
100
-300
200
300
400
500
-400
-55125
RESISTANCE-RATIO ACCURACY
紫外线消毒
vs. VOLTAGE
VOLTAGE (V)
R
A
T
I
O
A
C
C
U
R
A
C
Y
(
%
)
35
浦江仙华山30
510152025
-0.03
-
0.02
-0.01
0.01
0.02
0.03
0.04
-0.04
040
Typical Operating Characteristics
(V P1-P3= 10V, T A= +25°C, unless otherwi noted.)
1
2πRC4年级数学手抄报
R R
R R
12
12
×
+
kT
C
DC ELECTRICAL CHARACTERISTICS (continued)
(T A= -55°C to +125°C, unless otherwi noted. Typical values are at T A= +25°C.) (Note 1)
M A X 5492
10k ΩPrecision-Matched Resistor-Divider in SOT234_______________________________________________________________________________________
FREQUENCY RESPONSE
FREQUENCY (kHz)
R E S P O N S E (d B )
10,00010001
10
100
-15-12-9-6-3
036-18
0.1
100,000
SPECTRAL NOISE DENSITY
FREQUENCY (Hz)
N O I S E (n V /√H z )
100
10
1000
1
100
10
TOTAL HARMONIC DISTORTION
PLUS NOISE RESPONSE
FREQUENCY (Hz)
T H D +N (%)
10k
1k 100
0.001
0.010.11
101000.0001
10
100k
Typical Operating Characteristics (continued)
(V P1-P3= 10V, T A = +25°C, unless otherwi noted.)
Pin Description
Detailed Description
The MAX5492 consists of two precision, low-ratio-drift resistors with an end-to-end resistance of 10k Ω(R 1+ R 2).(See Figure 1.) P3 is the t point of the divider. The maximum working voltage of the MAX5492 is 40V.This device offers a wide range of resistance ratios (R 1/R 2) from 1:1 to 10:1 and is ideally suited for preci-sion operational-amplifier gain/attenuation control. The MAX5492 features a ±2kV ESD protection that enhances system robustness. A maximum initial ratio accuracy of 0.035% and a low ratio drift enhance sys-tem accuracy.
Applications Information
Kelvin Sensing
Kelvin nsing can improve accuracy in nsitive appli-cations. Apply a voltage or current at P1 and u n high (SH) and n low (SL) to monitor the voltage at the upper and lower ends of the resistor string.
MAX5492古乡
10k ΩPrecision-Matched Resistor-Divider in SOT23
_______________________________________________________________________________________5
Self-Heating and Error
Applying a voltage across terminals P1 and P2 caus
the device to heat up due to power dissipation. In high-voltage applications, consider the error in resistance-ratio temperature coefficient caud by lf-heating.The worst-ca lf-heating occurs when the operating voltage attains its maximum value. Approximate the result of power dissipation under this condition as:
The thermal resistance from junction to ambient, θJ-A ,
for a 5-pin SOT23 package is 141°C/W. Calculate the resulting temperature ri 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 lf-heating is:
22.5°C x 1.5ppm/°
C = 33.75ppm
Figure 3. Buffered Attenuator Figure 1. Inverting Amplifier Configuration
Figure 4. Attenuator with Buffer
Figure 2. Noninverting Amplifier Configuration
Typical Applications
M A X 5492
10k ΩPrecision-Matched Resistor-Divider in SOT236_______________________________________________________________________________________
