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 10kΩ. Resistance ratios from 1:1 to
10:1 are available. Five standard ratios are available (see
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-setting 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
Base 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 R1
and R2
♦Tiny 5-Pin SOT23 Package
MAX5492
10kΩPrecision-Matched
Resistor-Divider in SOT23
________________________________________________________________ Maxim Integrated Products 1
P2
15SH
4P3
P1
SOT23
TOP VIEW
3
SL 2MAX5492
Pin Configuration
Ordering Information*
P1
P2
SL P3
SH
MAX5492
R2
R1
Block Diagram
19-3695; Rev 0; 5/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
*See the How to Order section for more details.
PA R T T EM P
R A N G E
PIN -
PA C K A G E
R A T IO
A C C U R A C Y
( % )
M AX 5492_A_ _ _ _ _ - T- 55° C to + 125°C 5 S O T23- 50.035
M AX 5492_B_ _ _ _ _ - T- 55° C to + 125°C 5 S O T23- 50.05
M AX 5492_C _ _ _ _ _ - T- 55° C to + 125°C 5 S O T23- 50.1
MAX5492
10kΩPrecision-Matched
Resistor-Divider in SOT23
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(TA= -55°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage Between P1 and P2 ................................................±50V
Continuous Current into Any Pin......................................±4.2mA
Continuous Power Dissipation (TA = +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
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5492_A, TA = +25°C ±0.035
MAX5492_B, TA = +25°C ±0.05
Initial Resistor-Ratio Error (Note 2)
MAX5492_C, TA = +25°C ±0.1
%
Ratio 1.1:1 1.5
Ratio 1.5:1 3
Resistance-Ratio Temperature
Coefficient (Note 3)
Ratio 3.2:1 ≤ ratio ≤ 10:1 5.5
ppm/°C
Absolute Temperature Coefficient
of Resistance TCR (Note 4) 35 ppm/°C
Voltage Coefficient of Resistance VCR (Note 5) 0.1 ppm/V
End-to-End Resistance (R1 + R 2) 9.25 10 10.75 kΩ
Continuous Working Voltage
Between P1 and P2 VP1-P2 -40 +40 V
P1, P2, P3, SL, SH Capacitance 2pF
Resistance-Ratio Stability 2000 hours at +70°C±0.03 %
-3dB Bandwidth f3dB 1.1:1 ratio (Note 6) 30 MHz
Thermal Noise (Note 7) 45 µVRMS
Current Noise (Note 8) <-30 dB
Maximum Power Rating 160 mW
Note 1: The MAX5492 is 100% production tested at TA= +25°C. Specifications over -55°C to +125°C are guaranteed by design
and characterization.
Note 2: Testing conditions: TA= +25°C, VP1-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
RT
1
2
1
2
⎛
⎝
⎜⎞
⎠
⎟
×
∆
∆
R
R
R
RV
1
2
1
2
⎛
⎝
⎜⎞
⎠
⎟
×
∆
∆
RR
RR T
12
12
+
()
+
()
×
Note 4: Absolute TCR is defined as and is tested at 10V and 40V.
Note 6: Calculate bandwidth by using where C is CP3 and R = .
Note 7: Calculated according to noise.
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
MAX5492 toc01
TEMPERATURE (°C)
RATIO DRIFT (ppm)
9565-25 5 35
-150
-100
-50
0
50
100
150
200
-200
-55 125
VP1-P2 = 10V
RATIO = 1.1:1
NORMALIZED RESISTANCE-RATIO DRIFT
vs. TEMPERATURE
MAX5492 toc02
TEMPERATURE (°C)
RATIO DRIFT (ppm)
9565-25 5 35
-400
-200
0
200
400
600
-600
-55 125
VP1-P2 = 10V
RATIO = 3.2:1
NORMALIZED RESISTANCE-RATIO DRIFT
vs. TEMPERATURE
MAX5492 toc03
TEMPERATURE (°C)
RATIO DRIFT (ppm)
9565-25 5 35
-200
-100
100
-300
0
200
300
400
500
-400
-55 125
VP1-P2 = 10V
RATIO = 10:1
RESISTANCE-RATIO ACCURACY
vs. VOLTAGE
MAX5492 toc04
VOLTAGE (V)
RATIO ACCURACY (%)
3530510 15 20 25
-0.03
-0.02
-0.01
0
0.01
0.02
0.03
0.04
-0.04
040
RATIO = 1.1:1
Typical Operating Characteristics
(VP1-P3 = 10V, TA= +25°C, unless otherwise noted.)
1
2πRC
RR
RR
12
12
×
+
kT
C
DC ELECTRICAL CHARACTERISTICS (continued)
(TA= -55°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
MAX5492
10kΩPrecision-Matched
Resistor-Divider in SOT23
4 _______________________________________________________________________________________
FREQUENCY RESPONSE
MAX5492 toc05
FREQUENCY (kHz)
RESPONSE (dB)
10,0001000110100
-15
-12
-9
-6
-3
0
3
6
-18
0.1 100,000
RATIO = 1.1:1
CL = 10pF
SPECTRAL NOISE DENSITY
MAX5492 toc06
FREQUENCY (Hz)
NOISE (nV/√Hz)
10010 10001
100
10
VP1-P2 = 10V
VP1-P2 = 2V
RATIO = 1.1:1
TOTAL HARMONIC DISTORTION
PLUS NOISE RESPONSE
MAX5492 toc07
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001
0.01
0.1
1
10
100
0.0001
10 100k
RATIO = 1.1:1
20Hz TO 20kHz BANDPASS
Typical Operating Characteristics (continued)
(VP1-P3 = 10V, TA= +25°C, unless otherwise noted.)
Pin Description
PIN NAME FUNCTION
1 P1 R1 Connection Terminal
2SL
Sense Connection for Low Side of Resistor String. Leave floating or connect in a Kelvin connection
configuration.
3 P2 R2 Connection Terminal
4 P3 Set-Point Connection Terminal
5SH
Sense Connection for High Side of Resistor String. Leave floating or connect in a Kelvin connection
configuration.
Detailed Description
The MAX5492 consists of two precision, low-ratio-drift
resistors with an end-to-end resistance of 10kΩ(R1+ R2).
(See Figure 1.) P3 is the set point of the divider. The
maximum working voltage of the MAX5492 is 40V.
This device offers a wide range of resistance ratios
(R1/R2) 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 sensing can improve accuracy in sensitive appli-
cations. Apply a voltage or current at P1 and use sense
high (SH) and sense low (SL) to monitor the voltage at
the upper and lower ends of the resistor string.
MAX5492
10kΩPrecision-Matched
Resistor-Divider in SOT23
_______________________________________________________________________________________ 5
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:
The thermal resistance from junction to ambient, θJ-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
PV
R
V
kmW
DISS MAX
=
()
=
()
=
22
40
10 160
Ω
IN
P1
P2
P3
MAX5492
R2
R1
OUT
Figure 3. Buffered Attenuator
MAX5492
R2R1
P1
P2
P3
IN
OUT
Figure 1. Inverting Amplifier Configuration
P1
P2
P3
MAX5492
R2
R1
OUT
IN
Figure 4. Attenuator with Buffer
MAX5492
R2R1
P1
P2
P3
IN
OUT
Figure 2. Noninverting Amplifier Configuration
AV
V
R
R
OUT
IN
==−
1
2AV
V
R
R
OUT
IN
==+11
2
AV
V
R
RR
OUT
IN
==
+
2
12
AV
V
R
RR
OUT
IN
==
+
2
12
Typical Applications
MAX5492
10kΩPrecision-Matched
Resistor-Divider in SOT23
6 _______________________________________________________________________________________
Example Part Numbers
PREFIX MAX 5492 V A 10000 -T
ROOT PART NUMBER
MAX5492 = 10kΩ End-to-End
RATIO RANGE
L through W. Resistor ratio must fall in the appropriate
ratio range. (See Table 2.)
RATIO ACCURACY
A = 0.035% (max); B = 0.05% (max); C = 0.1% (max)
RESISTANCE RATIO
Five-number ratio designator. Ratios available from 1:1 to 10:1.
Format examples:
01000 = 1:1
02500 = 2.5:1
07538 = 7.538:1
10000 = 10:1
TAPE AND REEL
How to Order
PART NUMBER RESISTOR-RATIO RANGE RESISTOR-RATIO
ACCURACY (% MAX) RESISTOR RATIO
MAX5492PA02500-T 2.000 to 2.999 0.035 2.5:1
MAX5492RB03000-T 3.000 to 3.999 0.05 3:1
MAX5492UA07538-T 7.538 to 10.0 0.035 7.538:1
MAX5492
10kΩPrecision-Matched
Resistor-Divider in SOT23
_______________________________________________________________________________________ 7
*Standard ratios are available for ordering in any quantity. Nonstandard ratios are also available for values from 1:1 to 10:1. A minimum
order quantity of 10,000 units is required for nonstandard ratios. Contact factory for more information.
Table 2. Ratio Ranges
LETTER SUFFIX RESISTOR-RATIO RANGE
R 1.0 to 1.399
P 1.4 to 1.999
N 2.0 to 2.999
M 3.0 to 7.537
L 7.538 to 10
Table 1. Standard Ratios*
PART NUMBER RESISTOR RATIO RESISTOR-RATIO
SUFFIX
RESISTOR-RATIO
ACCURACY (% MAX) TOP MARK
MAX5492RA01100-T 1.1:1 01100 0.035 AERA
MAX5492RB01100-T 1.1:1 01100 0.05 AERC
MAX5492RC01100-T 1.1:1 01100 0.1 AERE
MAX5492PA01500-T 1.5:1 01500 0.035 AEQU
MAX5492PB01500-T 1.5:1 01500 0.05 AEQW
MAX5492PC01500-T 1.5:1 01500 0.1 AEQY
MAX5492PA03200-T 3.2:1 03200 0.035 AEVE
MAX5492PB03200-T 3.2:1 03200 0.05 AEVF
MAX5492PC03200-T 3.2:1 03200 0.1 AEVG
MAX5492LA07538-T 7.538:1 07538 0.035 AEQB
MAX5492LB07538-T 7.538:1 07538 0.05 AEQD
MAX5492LC07538-T 7.538:1 07538 0.1 AEQF
MAX5492LA10000-T 10:1 10000 0.035 AEQC
MAX5492LB10000-T 10:1 10000 0.05 AEQE
MAX5492LC10000-T 10:1 10000 0.1 AEQG
Chip Information
TRANSISTOR COUNT: 0
PROCESS: BiCMOS
MAX5492
10kΩPrecision-Matched
Resistor-Divider in SOT23
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
SOT-23 5L .EPS
E
1
1
21-0057
PACKAGE OUTLINE, SOT-23, 5L
