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MAX5420AEUA-MAX5420AEUA+-MAX5420BEUA-MAX5420BEUA+
Digitally Programmable Precision Voltage Divider for PGAs
General DescriptionThe MAX5420 and MAX5421 are digitally programmable
precision voltage dividers optimized for use in digitally pro-
grammable gain amplifier configurations. The MAX5420/
MAX5421 operate from a single +5V supply or dual ±5V
supply, and consume only 3µA supply current. These
devices consist of a digitally selectable resistor array that
provides four precision noninverting gains of 1, 2, 4, and 8
for PGAs. The MAX5420 and MAX5421 achieve a resistor
ratio accuracy of 0.025% (MAX542_A), 0.09% (MAX542_B),
and 0.5% (MAX542_C). The MAX5421 includes an on-chip
matching resistor for op amp bias-current compensation.
The MAX5420 and MAX5421 are available in 8-pin and
10-pin µMAX packages. The devices are specified over
the extended temperature range (-40°C to +85°C).
ApplicationsGeneral-Purpose Programmable Noninverting
Amplifiers
Programmable Instrumentation Amplifiers
FeaturesFour Precision Divider Ratios For Noninverting
Gains of 1, 2, 4, and 8 in PGAs0.025%, 0.09%, or 0.5% Ratio Accuracy
Guaranteed Over -40°C to +85°COn-Chip Matching Resistor for Op Amp Bias-
Current Compensation (MAX5421)5V Single or ±5V Dual Supply OperationLow 3µA Supply CurrentCMOS/TTL Logic Compatible 2-Wire Parallel
InterfaceSmall 8-Pin and 10-Pin µMAX Packages
MAX5420/MAX5421
Digitally Programmable Precision
Voltage Divider for PGAsD0VSS
GND
VDD
μMAX-8
TOP VIEW
MAX5420
MATCH_HD0
GND
VSS
VDD
MAX5421
μMAX-10
MATCH_LD1
Pin Configurations
Ordering Information
Functional Diagram19-2230; Rev 2; 2/05
PARTTEMP.
RANGE
PIN-
PACKAGE
GAIN
ACCURACY
MAX5420AEUA-40°C to +85°C8 µMAX0.025%
MAX5420BEUA-40°C to +85°C8 µMAX0.09%
MAX5420CEUA-40°C to +85°C8 µMAX0.5%
MAX5421AEUB-40°C to +85°C10 µMAX0.025%
MAX5421BEUB-40°C to +85°C10 µMAX0.09%
MAX5421CEUB-40°C to +85°C10 µMAX0.5%
DECODER
MATCH_H
MATCH_L
MAX5421 ONLYVDDGNDVSS
MAX5420
MAX5421
MAX5420/MAX5421
Digitally Programmable Precision
Voltage Divider for PGAs
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= +5V ±5%, VSS= -5V ±5% or VSS= GND, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
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.
VDDto GND..............................................................-0.3V to +6V
VSSto GND...............................................................+0.3V to -6V
D0, D1 to GND...........................................-0.3V to (VDD+ 0.3V)
H, L, W, MATCH_ to GND................(VSS- 0.3V) to (VDD+ 0.3V)
Input and Output Latchup Immunity.................................±50mA
Continuous Power Dissipation (TA= +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C).............333mW
10-Pin µMAX (derate 5.6mW/°C above +70°C)...........444mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-60°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSMAX542_A±0.025
MAX542_B±0.09Divider Ratio Accuracy
MAX542_C±0.5
H-to-L ResistanceRHL(Figure 1)15kΩ
Input Resistance at HRH15kΩ
VSS = -5V300Ratio = 1VSS = 0500ΩInput Resistance at WRW
Ratio = 2, 4, 88kΩ
Capacitance at H, L, W,
MATCH_H, MATCH_LCANALOG5pF
VSS = -5V300Ratio = 1VSS = 0500ΩMatching ResistorMAX5421
Ratio = 2, 4, 88kΩ
DYNAMIC PERFORMANCESwitching TimetSD D = + 5V , V S S = - 5V , d i g i tal i np ut 0 to + 3V ,W settl es to 0.02% of fi nal val ue w i th 2p F
cap aci ti ve l oad . C i r cui t of Fi g ur e 2.
0.5µs
DIGITAL INPUTSInput High VoltageVIH2.4
Input Low VoltageVIL0.8V
Input Leakage CurrentD1, D0 = VDD or GND±1µA
Input Capacitance5pF
MAX5420/MAX5421
Digitally Programmable Precision
Voltage Divider for PGAs
ELECTRICAL CHARACTERISTICS (continued)(VDD= +5V ±5%, VSS= -5V ±5% or VSS= GND, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
POWER SUPPLIESPositive Supply VoltageVDD4.755.25
Negative Supply VoltageVSS0-5.25V
D1, D0 = VDD or GND37Positive Supply CurrentIDDD1, D0 = 3V1525µA
D1, D0 = VDD or GND37Negative Supply CurrentISSD1, D0 = 3V1525µA
W, H, L, MATCH_L, MATCH_H
Voltage RangeVSSVDDV
Typical Operating Characteristics(VDD= +5V, VSS= -5V, or VSS= GND, TA= +25°C, unless otherwise noted.) (Note 1)
MAX542_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE
MAX5420/21 toc01
TEMPERATURE (°C)
RATIO ACCURACY (%)
VH = +5V
VL = -5V
RATIO = 1
MAX542_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE
MAX5420/21 toc02
TEMPERATURE (°C)
RATIO ACCURACY (%)
VH = +5V
VL = -5V
RATIO = 2
MAX542_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE
MAX5420/21 toc03
TEMPERATURE (°C)
RATIO ACCURACY (%)
VH = +5V
VL = -5V
RATIO = 4
MAX5420/MAX5421
Digitally Programmable Precision
Voltage Divider for PGAsMAX542_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE
MAX5420/21 toc04
TEMPERATURE (°C)
RATIO ACCURACY (%)
VH = +5V
VL = -5V
RATIO = 8
MAX542_B DIVIDER RATIO ACCURACY
vs. TEMPERATURE
MAX5420/21 toc05
TEMPERATURE (°C)
RATIO ACCURACY (%)
VH = +5V
VL = -5V
RATIO = 1
MAX542_B DIVIDER RATIO ACCURACY
vs. TEMPERATURE
MAX5420/21 toc06
TEMPERATURE (°C)
RATIO ACCURACY (%)
VH = +5V
VL = -5V
RATIO = 2
MAX542_B DIVIDER RATIO ACCURACY
vs. TEMPERATURE
MAX5420/21 toc07
TEMPERATURE (°C)
RATIO ACCURACY (%)
VH = +5V
VL = -5V
RATIO = 4
MAX542_B DIVIDER RATIO ACCURACY
vs. TEMPERATURE
MAX5420/21 toc08
TEMPERATURE (°C)
RATIO ACCURACY (%)
VH = +5V
VL = -5V
RATIO = 8
MAX542_A RATIO ACCURACY
vs. POSITIVE SUPPLY VOLTAGE
MAX5420/21 toc09
POSITIVE SUPPLY VOLTAGE (V)
RATIO ACCURACY (%)
VH = +3V, VL = 0
RATIO = 4
RATIO = 2
RATIO = 1
RATIO = 8
MAX542_B RATIO ACCURACY
vs. POSITIVE SUPPLY VOLTAGE
MAX5420/21 toc10
POSITIVE SUPPLY VOLTAGE (V)
RATIO ACCURACY (%)
VH = +3V, VL = 0
RATIO = 2
RATIO = 1
RATIO = 4
RATIO = 8
MAX542_A RATIO ACCURACY
vs. NEGATIVE SUPPLY VOLTAGE
MAX5420/21 toc11
NEGATIVE SUPPLY VOLTAGE (V)
RATIO ACCURACY (%)
VH = 5V, VL = 0
RATIO = 8
RATIO = 4
RATIO = 1
RATIO = 2
MAX542_B RATIO ACCURACY
vs. NEGATIVE SUPPLY VOLTAGE
MAX5420/21 toc12
NEGATIVE SUPPLY VOLTAGE (V)
RATIO ACCURACY (%)0.001
RATIO = 1
VH = 5V, VL = 0
RATIO = 8
RATIO = 2
RATIO = 4
Typical Operating Characteristics (continued)(VDD= +5V, VSS= -5V, or VSS= GND, TA= +25°C, unless otherwise noted.) (Note 1)
MAX5420/MAX5421
Digitally Programmable Precision
Voltage Divider for PGAs100ns/div
VH = +5V, VL = -5V
SWITCHING TIME
(RATIO 1-TO-2)2V/div
MAX5420/21 toc13
D0, 5V/div
100ns/div
VH = +5V, VL = -5V
SWITCHING TIME
(RATIO 2-TO-4)1V/div
MAX5420/21 toc14
D1, 5V/div
100ns/div
VH = +5V, VL = -5V
SWITCHING TIME
(RATIO 4-TO-8)500mV/div
MAX5420/21 toc15
D0, 5V/div
SUPPLY CURRENT
vs. TEMPERATURE
MAX5420/21 toc16
TEMPERATURE (°C)
SUPPLY CURRENT (
D1, D0 = GND or VDD
Typical Operating Characteristics (continued)(VDD= +5V, VSS= -5V, or VSS= GND, TA= +25°C, unless otherwise noted.) (Note 1)
Note 1:For MAX542_C accuracy Typical Operating Characteristics, refer to MAX542_B accuracy Typical Operating Characteristics.
MAX5420/MAX5421Detailed DescriptionThe MAX5420/MAX5421 are digitally programmable pre-
cision voltage dividers for programmable-gain amplifiers.
Operationally, these devices consist of digitally selectable
precision resistor-dividers providing noninverting gains of
1, 2, 4, and 8 for PGA applications (see Functional
Diagramand Figure 1).
The MAX5420/MAX5421 achieve divider ratio accuracy of
0.025% (MAX5420A/MAX5421A), 0.09% (MAX5420B/
MAX5421B) or 0.5% (MAX5420C/MAX5421C).
The end-to-end resistance from H to L is 15kΩ. The
impedance seen at W is designed to be the same 8kΩ
for divider ratios 2, 4, and 8, ensuring excellent imped-
ance matching and constant switching times. In gain of
+1 configuration, H is internally connected to W with a
typical resistance of 500Ω.
Matching Resistor (MAX5421)The MAX5421 includes a matching resistor to compen-
sate for offset voltage due to input bias current of the
op amp. The resistance from MATCH_H to MATCH_L,
equals the resistance seen at W for gains of 2, 4, and 8.
In the gain of +1, an internal switch connects
MATCH_H and MATCH_L. This internal switch matches
the impedance of the switch between H and W.
Digital Interface OperationThe MAX5420/MAX5421 feature a simple two-bit paral-
lel programming interface. D1 and D0 program the
divider ratio setting according to the Logic Control
Truth Table(Table 1). The digital interface is CMOS/TTL
logic compatible.
Applications Information
Programmable-Gain Amplifier The MAX5420/MAX5421 are ideally suited for high-pre-
cision PGA applications. The typical application circuit
of Figure 3 uses the MAX5421 with matching resistor to
compensate for voltage offset due to op amp input bias
currents. Use the MAX5420 with an ultra-low input bias
current op amp such as the MAX4237 (Figure 4).
Power Supplies and BypassingThe MAX5420/MAX5421 operate from dual ±5V sup-
plies, or a single +5V supply. For dual supplies, bypass
VDDand VSSwith 0.1µF ceramic capacitors to GND.
For single supply, connect VSSto GND and bypass
VDDwith a 0.1µF ceramic capacitor to GND.
RatioRB=+1_
Digitally Programmable Precision
Voltage Divider for PGAs
DIGITAL INPUTSD0
DIVIDER
RATIO1248
Table 1. Logic Control Truth Table
PIN
MAX5420MAX5421
NAMEFUNCTIONVDDPositive Supply VoltageVSSNegative Supply Voltage3GNDGround
4, 54, 5D0, D1Digital Control Inputs. Drive D0 and D1 logic high or logic low to set the divider ratio.
See Logic Control Truth Table.8LLow Terminal of Resistor-Divider9WResistor-Divider Output10HHigh Terminal of Resistor-Divider6MATCH_LMatching Resistor Low Terminal7MATCH_HMatching Resistor High Terminal
Pin Description
