MAX5491LA01000+T ,Precision-Matched Resistor-Divider in SOT23Block Diagram Pin ConfigurationTOP VIEWP1MAX5491P1 1R13 P3MAX5491P3P2 2R2P2SOT23____ Maxim Integrat ..
MAX5491PC02000+T ,Precision-Matched Resistor-Divider in SOT23FeaturesThe MAX5491 precision resistor-divider consists of two♦ Resistance Ratios from 1:1 to 30:1a ..
MAX5491SC03200+T ,Precision-Matched Resistor-Divider in SOT23ELECTRICAL CHARACTERISTICS(T = -40°C to +85°C, unless otherwise noted. Typical values are at T = +2 ..
MAX5494ETE+ ,10-Bit, Dual, Nonvolatile, Linear-Taper Digital PotentiometersFeaturesThe MAX5494–MAX5499 10-bit (1024-tap), dual, non-♦ Wiper Position Stored in Nonvolatile Mem ..
MAX5495ETE+ ,10-Bit, Dual, Nonvolatile, Linear-Taper Digital Potentiometersapplications requiringlow-temperature-coefficient programmable voltage-TOP VIEWdividers such as low ..
MAX5496ETE+ ,10-Bit, Dual, Nonvolatile, Linear-Taper Digital PotentiometersELECTRICAL CHARACTERISTICS(V = +2.7V to +5.25V, V = GND = 0, V = V , V = 0, T = -40°C to +85°C, unl ..
MAZ3043 ,Small-signal deviceAbsolute Maximum Ratings T = 25°CaParameter Symbol Rating Unit 1: Anode2: N.C.Average forward curr ..
MAZ3043H ,Silicon planar typeFeatures 1•Mini type package (3-pin)3•Allowing to achieve a high-density set2•Sharp rising performa ..
MAZ3051 ,Small-signal deviceElectrical Characteristics T = 25°C aParameter Symbol Conditions Min Typ Max UnitForward voltage V ..
MAZ3051-L ,Silicon planar typeElectrical characteristics within part numbers T = 25°Ca•V = 2.0 V to 8.2 V (I = 5 mA)Z ZTemperatu ..
MAZ3056-L ,Silicon planar typeAbsolute Maximum Ratings T = 25°Ca0.1 to 0.3Parameter Symbol Rating Unit0.4 ± 0.2Average forward c ..
MAZ3068 ,Small-signal deviceElectrical characteristics within part numbers T = 25°Ca• V = 2.0 V to 8.2 V (I = 5 mA)Z ZTemperat ..
MAX5491LA01000+T-MAX5491PC02000+T-MAX5491SC03200+T
Precision-Matched Resistor-Divider in SOT23
General DescriptionThe MAX5491 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 MAX5491 includes an
extremely low resistance-ratio temperature drift of
2ppm/°C over -40°C to +85°C, and has an end-to-end
resistance of 30kΩ. Resistance ratios from 1:1 to 30:1 are
available. Ten standard ratios are available (see Table
1), and custom ratios are also available upon request. To
enhance device and system robustness, the MAX5491
also features ±2kV Human Body Model electrostatic dis-
charge (ESD) protection to ensure against real-world
ESD events. The MAX5491 is ideal for precision gain-set-
ting applications where tight resistance matching and
low temperature drift are necessary.
The MAX5491 is available in a space-saving 3-pin
SOT23 package, and is guaranteed over the extended
-40°C to +85°C temperature range.
ApplicationsIndustrial Process Control
Instrumentation
Precision Gain Setting
Medical Equipment
Automatic Test Equipment
Base Stations
FeaturesResistance Ratios from 1:1 to 30:1Custom Ratios Available Upon Request±2kV Human Body Model ESD ProtectionTight Initial Ratio Accuracy
0.035% (MAX5491A)
0.05% (MAX5491B)
0.1% (MAX5491C)Low 2ppm/°C Resistor-Ratio-DriftUp to 50V Operating Voltage Across Sum of R1
and R2Tiny 3-Pin SOT23 Package
MAX5491
Precision-Matched Resistor-Divider in SOT23P3
P1
MAX5491
SOT23TOP VIEW
Pin Configuration
Ordering Information*MAX5491
Block Diagram19-3009; Rev 3; 12/04
*See the How to Order section for more details.
PA R T T EM PA N G E
PIN -
PA C K A G E
RA TIO
AC CUR ACY
(%)MAX5491_A_ _ _ _ _ -T-40°C to +85°C3 SOT23-30.035
MAX5491_B_ _ _ _ _ -T-40°C to +85°C3 SOT23-30.05
MAX5491_C_ _ _ _ _ -T-40°C to +85°C3 SOT23-30.1
MAX5491
Precision-Matched Resistor-Divider in SOT23
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS(TA= -40°C to +85°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....................................±1.75mA
Continuous Power Dissipation (TA = +70°C)
3-Pin SOT23 (derate 7.1mW/°C above +70°C).........571.4mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSMAX5491_A, TA = +25°C±0.035
MAX5491_B, TA = +25°C±0.05Initial Resistor Ratio Error (Note 2)
MAX5491_C, TA = +25°C±0.1
1:1 ≤ ratio ≤ 3.2:12
3.2:1 < ratio ≤ 10:14Resistance-Ratio Temperature
Coefficient (Note 3)
10:1 < ratio ≤ 30:15.5
ppm/°C
Absolute Temperature Coefficient
of ResistanceTCR(Note 4)35ppm/°C
Voltage Coefficient of ResistanceVCR(Note 5)0.1ppm/V
End-to-End Resistance (R1 + R2)28.53031.5kΩ
Continuous CurrentIR1, IR2±1.75mA
Continuous Working Voltage
Between P1 and P2VP1-P2050V
Power Rating87.5mW
Pin Capacitance2pF
Resistance Ratio Long-Term
Stability2000hr at +70°C±0.03%
Note 1:The MAX5491 is 100% production tested at TA= +25°C. Specifications over -40°C to +85°C are guaranteed by design.
Note 2:Testing conditions: TA= +25°C, VP1-P2= 9V and 50V.
Note 3:Resistance-ratio temperature coefficient is defined as
Note 4:Absolute TCR is defined as
and is tested at 9V and 50V.
Note 5:Resistance-ratio voltage coefficient is defined asT⎜⎞⎟ V⎜⎞⎟ T ()()×
MAX5491
Precision-Matched Resistor-Divider in SOT23
NORMALIZED RESISTOR-RATIO DRIFT
vs. TEMPERATUREMAX5491 toc01
TEMPERATURE (°C)
RATIO DRIFT (ppm)50-25025
VP1-P2 = 10V
RATIO = 1:1
NORMALIZED RESISTOR-RATIO DRIFT
vs. TEMPERATUREMAX5491 toc02
TEMPERATURE (°C)
RATIO DRIFT (ppm)50-25025
VP1-P2 = 10V
RATIO = 5:1
Typical Operating Characteristics(VP1-P2= 10V, TA= +25°C, unless otherwise noted.)
Pin Description
PINNAMEFUNCTION1P1R1 Connection Terminal
2P2R2 Connection TerminalP3Midpoint Between R1 and R2 Connection Terminals
Detailed DescriptionAs shown in the Block Diagram, the MAX5491 consists
of two precision, low-ratio-drift resistors with an end-to-
end resistance of 30kΩ(R1+ R2). P3 is the center tap
of the divider. The maximum working voltage of the
MAX5491 is 50V. This device offers a wide range of
resistance ratios (R1/R2) from 1:1 to 30:1 and is ideally
suited for precision operational amplifier gain/attenua-
tion control. The MAX5491 features a ±2kV ESD protec-
tion that enhances system robustness. A maximum
initial ratio accuracy of 0.035% and a low 2ppm/°C ratio
drift enhance system accuracy.
MAX5491
Applications Information
Self-Heating and ErrorApplying 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 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 = 23.4ppmVmWDISS
MAX .=()=()=50833Ω
Precision-Matched Resistor-Divider in SOT23MAX5491
OUT
Figure 3. Buffered Attenuator
MAX5491R1P2
OUT
Figure 1. Inverting Amplifier Configuration
MAX5491
OUT
Figure 4. Attenuator with Buffer
MAX5491R1P2
OUT
Figure 2. Noninverting Amplifier ConfigurationV
OUT ==−1AV
OUT ==+11V
OUT ==+V
OUT ==+
Typical Applications
Example Part Numbers
MAX5491
Precision-Matched Resistor-Divider in SOT23
PREFIXMAX5491VA10000-T
ROOT PART NUMBERMAX5491 = 30kΩ End-to-End
RATIO RANGEL through W. Resistor ratio must fall in the appropriate
ratio range. (See Table 2.)
RATIO ACCURACYA = 0.035% (max); B = 0.05% (max); C = 0.1% (max)
RESISTANCE RATIOFive number ratio designator. Ratios available from 1:1 to 30:1.
Format examples:010000 = 1:1
02500 = 2.5:1
07538 = 7.538:1
25000 = 25:1
TAPE AND REEL
How to Order
PARTRESISTOR-RATIO RANGERESISTOR-RATIO
ACCURACY (% MAX)RESISTOR RATIOMAX5491RA02500-T2.000 to 2.8990.0352.5:1
MAX5491VC10000-T10.000 to 15.9990.10010:1
MAX5491SB03200-T2.900 to 3.9990.0503.2:1
MAX5491UA07538-T6.000 to 9.9990.0357.538:1
Table 1. Standard Ratios*
PARTRESISTOR RATIORESISTOR-RATIO
SUFFIX
RESISTOR-RATIO
ACCURACY (% MAX)TOP MARKMAX5491LA01000-T1:1010000.035FZPD
MAX5491LB01000-T1:1010000.050FZPE
MAX5491LC01000-T1:1010000.100FZPF
MAX5491MA01100-T1.1:1011000.035FZPA
MAX5491MB01100-T1.1:1011000.050FZPB
MAX5491MC01100-T1.1:1011000.100FZPC
MAX5491NA01500-T1.5:1015000.035FZOX
MAX5491NB01500-T1.5:1015000.050FZOY
MAX5491NC01500-T1.5:1015000.100FZOZ
MAX5491PA02000-T2:1020000.035FZOO
MAX5491PB02000-T2:1020000.050FZOP
MAX5491PC02000-T2:1020000.100FZOQ
MAX5491RA02500-T2.5:1025000.035FZPP
MAX5491
Precision-Matched Resistor-Divider in SOT23
Table 1. Standard Ratios* (continued)
PARTRESISTOR RATIORESISTOR-RATIO
SUFFIX
RESISTOR-RATIO
ACCURACY (% MAX)TOP MARKMAX5491RB02500-T2.5:1025000.050FZPQ
MAX5491RC02500-T2.5:1025000.100FZON
MAX5491SA03200-T3.2:1032000.035FZOU
MAX5491SB03200-T3.2:1032000.050FZOV
MAX5491SC03200-T3.2:1032000.100FZOW
MAX5491TA05000-T5:1050000.035FZOR
MAX5491TB05000-T5:1050000.050FZOS
MAX5491TC05000-T5:1050000.100FZOT
MAX5491UA07538-T7.538:1075380.035FZPM
MAX5491UB07538-T7.538:1075380.050FZPN
MAX5491UC07538-T7.538:1075380.100FZPO
MAX5491VA10000-T10:1100000.035FZPJ
MAX5491VB10000-T10:1100000.050FZPK
MAX5491VC10000-T10:1100000.100FZPL
MAX5491WA30000-T30:1300000.035FZPG
MAX5491WB30000-T30:1300000.050FZPH
MAX5491WC30000-T30:1300000.100FZPI
*Standard ratios are available for ordering in any quantity. Nonstandard ratios are also available for values between 1:1 to 30:1.
A minimum order quantity of 10,000 units is required for nonstandard ratios. Please contact factory for more information.
Table 2. Ratio Ranges
LETTER SUFFIXRESISTOR-RATIO RANGE1.000 to 1.0991.100 to 1.3491.350 to 1.6991.700 to 2.0002.001 to 2.8992.900 to 3.9994.000 to 5.9996.000 to 9.99910.000 to 15.99916.000 to 30.000
Chip InformationTRANSISTOR COUNT: 0
PROCESS: BiCMOS
