19-2222; Rev 1; 1/02
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
General Description
The MAX5430/MAX5431 are digitally programmable
high-precision resistor arrays for PGAs. The MAX5430/
MAX5431 operate from a single 15V supply or dual
±15V supplies, and consume only 35µA supply current.
These devices are intended for programmable-gain
amplifier (PGA) applications and consist of fixed resis-
tor-dividers. Each device has digitally controlled con-
tacts with four precision noninverting gains of 1, 2, 4,
and 8 with ratio accuracy of 0.025% (MAX5430A/
MAX5431A), 0.09% (MAX5430B/MAX5431B), or 0.5%
(MAX5430C/MAX5431C). The MAX5431 includes an
on-chip matching resistor for op amp input bias-current
compensation.
The MAX5430/MAX5431 are available in space-saving
8-pin SOT23 and 10-pin µMAX packages, and speci-
fied over the extended temperature range of (-40°C to
+85°C).
Features
o
Four Noninverting PGA Gain Configurations:
A
V
= 1, 2, 4, and 8
o
Precision 0.025% Ratio Accuracy
o
On-Chip Matching Resistor for Op Amp Bias-
Current Compensation (MAX5431)
o
Single-Supply 12V to 15V, or Dual-Supply ±12V to
±15V Operation
o
Low 35µA Supply Current
o
CMOS/TTL Logic Compatible 2-Wire Parallel
Interface
o
Space-Saving 8-Pin SOT23 and 10-Pin µMAX
Packages
o
3V Logic Compatibility
MAX5430/MAX5431
Applications
General-Purpose Programmable Noninverting
Amplifier
Programmable Instrumentation Amplifier
PART
Ordering Information
TEMP
RANGE
PIN-
GAIN
PACKAGE ACCURACY
8 SOT23
8 SOT23
8 SOT23
10 µMAX
10 µMAX
10 µMAX
0.025%
0.09%
0.5%
0.025%
0.09%
0.5%
MAX5430AEKA
-40°C to +85°C
MAX5430BEKA -40°C to +85°C
MAX5430CEKA -40°C to +85°C
MAX5431AEUB
-40°C to +85°C
MAX5431BEUB -40°C to +85°C
MAX5431CEUB -40°C to +85°C
Functional Diagram
V
DD
MAX5430
MAX5431
D0
DECODER
D1
MATCH_H
MATCH_L
V
SS
GND L
MAX5431 ONLY
H
Pin Configurations
TOP VIEW
V
DD
1
10 D0
W
MATCH_H 2
GND 3
H 4
L 5
MAX5431
9 D1
8 W
7 V
SS
6 MATCH_L
µMAX
Pin Configurations continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
MAX5430/MAX5431
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ............................................................-0.3V to +17V
V
SS
to GND.............................................................-17V to +0.3V
D0, D1 to GND .........................................................-0.3V to +6V
H, L, W, MATCH_ to GND ................(V
SS
- 0.3V) to (V
DD
+ 0.3V)
Current Into Any Signal Pin...............................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SOT23 (derate 8.9mW/°C above +70°C)............714mW
10-Pin µMAX (derate 10.3mW/°C above +70°C) .........825mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-60°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°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.
ELECTRICAL CHARACTERISTICS
(V
DD
= +15V, V
SS
= -15V, GND = 0, T
A
= T
MIN
to T
MAX
. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
DC PERFORMANCE
MAX543_A
Divider Ratio Accuracy
(Note 2)
Resistance between H and L
(Figure 1)
Capacitance at Analog Pins
Matching Resistor
W, H, L, MATCH_H, MATCH _L
Voltage Range
DIGITAL INPUTS
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance
POWER REQUIREMENTS
Negative Supply Current
Positive Supply Current
Positive Power-Supply Voltage
Negative Power-Supply Voltage
DYNAMIC PERFORMANCE
Switching Time
t
D2W,
t
H2W
0.3
µs
I
SS
I
DD
V
DD
V
SS
10.8
-15.75
1
35
25
60
15.75
0
µA
µA
V
V
C
IN
V
IH
V
IL
D0, D1 = 5V or GND
5
2.4
0.8
±1
V
V
µA
pF
V
ANALOG
R
HL
C
ANALOG
MAX5431 only
Ratio = 1
Ratio = 2, 4, 8
V
SS
V
H
= +5V, V
L
= -5V
MAX543_B
MAX543_C
57
2
0.5
14
V
DD
0.025
0.09
0.5
kΩ
pF
kΩ
V
%
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
All devices are 100% production tested at T
A
= +25°C. SOT23 packages are guaranteed by design from T
A
= T
MIN
to T
MAX.
Note 2:
Gain accuracy is measured without load at pin W.
2
_______________________________________________________________________________________
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
Typical Operating Characteristics
(V
DD
= +15V, V
SS
= -15V or V
SS
= GND, V
H
= 5V, V
L
=-5V, T
A
= 25°C, unless otherwise noted.) (Note 3)
MAX5430/MAX5431
MAX543_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 1)
MAX5430 toc01
MAX543_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 2)
MAX5430 toc02
MAX543_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 4)
0.008
DIVIDER RATIO ACCURACY (%)
0.006
0.004
0.002
0
-0.002
-0.004
-0.006
-0.008
MAX5430 toc03
0.0020
0.0015
DIVIDER RATIO ACCURACY (%)
0.0010
0.0005
0
-0.0005
-0.0010
-0.0015
-0.0020
-40 -25 -10
5
20
35
50
65
80
TEMPERATURE (°C)
0.010
0.008
DIVIDER RATIO ACCURACY (%)
0.006
0.004
0.002
0
-0.002
-0.004
-0.006
-0.008
-0.010
-40 -25 -10
5
20
35
50
65
80
TEMPERATURE (°C)
0.010
-0.010
-40 -25 -10
5
20
35
50
65
80
TEMPERATURE (°C)
MAX543_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 8)
MAX5430 toc04
MAX543_B DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 1)
MAX5430 toc05
MAX543_B DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 2)
0.015
DIVIDER RATIO ACCURACY (%)
0.010
0.005
0
-0.005
-0.010
-0.015
-0.020
-40 -25 -10
MAX5430 toc06
0.010
0.008
DIVIDER RATIO ACCURACY (%)
0.006
0.004
0.002
0
-0.002
-0.004
-0.006
-0.008
-0.010
-40 -25 -10
5
20
35
50
65
80
0.0020
0.0015
DIVIDER RATIO ACCURACY (%)
0.0010
0.0005
0
-0.0005
-0.0010
-0.0015
-0.0020
-40
0.020
-25 -10
5
20
35
50
65
80
5
20
35
50
65
80
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX543_B DIVIDER RATIO ACCURACY
vs.TEMPERATURE (RATIO = 4)
MAX5430 toc07
MAX543_B DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 8)
MAX5430 toc08
MAX543_A DIVIDER RATIO ACCURACY
vs. POSITIVE SUPPLY (V
SS
= -15V)
0.008
DIVIDER RATIO ACCURACY (%)
0.006
0.004
0.002
0
-0.002
-0.004
-0.006
-0.008
-0.010
RATIO 4
RATIO 8
RATIO 1
RATIO 2
MAX5430 toc09
0.010
0.008
DIVIDER RATIO ACCURACY (%)
0.006
0.004
0.002
0
-0.002
-0.004
-0.006
-0.008
-0.010
-40
-25 -10
5 20 35 50
TEMPERATURE (°C)
65
80
0.010
0.008
DIVIDER RATIO ACCURACY (%)
0.006
0.004
0.002
0
-0.002
-0.004
-0.006
-0.008
-0.010
-40 -25 -10
5
20
35
50
65
80
0.010
11
12
13
POSITIVE SUPPLY (V)
14
15
TEMPERATURE (°C)
_______________________________________________________________________________________
3
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
MAX5430/MAX5431
Typical Operating Characteristics (continued)
(V
DD
= +15V, V
SS
= -15V or V
SS
= GND, V
H
= 5V, V
L
=-5V, T
A
= 25°C, unless otherwise noted.) (Note 3)
MAX543_B DIVIDER RATIO ACCURACY
vs. POSITIVE SUPPLY (V
SS
= -15V)
MAX5430 toc10
MAX543_A DIVIDER RATIO ACCURACY
vs. POSITIVE SUPPLY (V
SS
= 0V)
MAX5430 toc11
MAX543_B DIVIDER RATIO ACCURACY
vs. POSITIVE SUPPLY (V
SS
= 0V)
0.008
DIVIDER RATIO ACCURACY (%)
0.006
0.004
0.002
0
-0.002
-0.004
-0.006
-0.008
-0.010
RATIO 1
RATIO 8
RATIO 2
RATIO 4
V
L
= 0
MAX5430 toc12
0.010
0.008
DIVIDER RATIO ACCURACY (%)
0.006
0.004
0.002
0
-0.002
-0.004
-0.006
-0.008
-0.010
11
12
13
POSITIVE SUPPLY (V)
14
RATIO 8
RATIO 1
RATIO 2
RATIO 4
0.010
0.008
DIVIDER RATIO ACCURACY (%)
0.006
0.004
0.002
0
-0.002
-0.004
-0.006
-0.008
-0.010
RATIO 8
RATIO 1
RATIO 4
RATIO 2
0.010
V
L
= 0
15
11
12
13
POSITIVE SUPPLY (V)
14
15
11
12
13
POSITIVE SUPPLY (V)
14
15
MAX543_A DIVIDER RATIO ACCURACY
vs. NEGATIVE SUPPLY
MAX5430 toc13
MAX543_B DIVIDER RATIO ACCURACY
vs. NEGATIVE SUPPLY
0.008
DIVIDER RATIO ACCURACY (%)
0.006
0.004
0.002
0
-0.002
-0.004
-0.006
-0.008
-0.010
0
-15
-12
-9
-6
-3
0
RATIO 1
RATIO 8
RATIO 2
RATIO 4
MAX5430 toc14
SUPPLY CURRENT
vs. TEMPERATURE
D0, D1 = 5V
25
SUPPLY CURRENT (µA)
20
15
10
5
D0, D1 = 0V
MAX5430 toc15
0.010
0.008
V
L
= 0
RATIO 2
RATIO 1
0.010
30
DIVIDER RATIO ACCURACY (%)
0.006
0.004
0.002
0
-0.002
-0.004
-0.006
-0.008
-0.010
-15
RATIO 4
RATIO 8
-12
-9
-6
-3
0
-40 -25 -10
5
20
35
50
65
80
NEGATIVE SUPPLY (V)
NEGATIVE SUPPLY (V)
TEMPERATURE (°C)
Note 3:
For MAX543_C accuracy
Typical Operating Characteristics,
refer to MAX543_B accuracy
Typical Operating Characteristics.
4
_______________________________________________________________________________________
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
Pin Description
PIN
NAME
MAX5431
1
2
3
4
5
6
7
8
9
10
MAX5430
8
—
7
6
5
—
4
3
2
1
V
DD
MATCH_H
GND
H
L
MATCH_L
V
SS
W
D1
D0
Positive Power Supply
Matching Resistor High Terminal
Ground
High Terminal of Resistive-Divider
Low Terminal of Resistive-Divider
Matching Resistor Low Terminal
Negative Power Supply
Wiper Terminal of Resistive-Divider
Second Bit Digital Input (MSB) (Table 1)
First Bit Digital Input (LSB) (Table 1)
FUNCTION
MAX5430/MAX5431
H
RATIO = 1
4R
(MAX5430A/MAX5431A), 0.09% (MAX5430B/MAX5431B),
or 0.5% (MAX5430C/MAX5431C).
The end-to-end resistance from H to L is 57kΩ. The
impedance seen at W is designed to be the same 14kΩ
for gain settings 2, 4, and 8, ensuring excellent op amp
input-resistance balance, regardless of gain setting
(MAX5431 only). In a gain of 1 configuration, H is inte-
rnally connected to W with a typical resistance of 500Ω.
RATIO = 2
2R
W
Matching Resistor (MAX5431)
The MAX5431 includes a matching resistor to compen-
sate the offset voltage due to the input bias current of
the op amp. The resistance from MATCH_H to
MATCH_L is a fixed matching resistor, equal to the
resistance seen at W for gains of 2, 4, and 8. In the
gain of 1, an internal switch short circuits MATCH_H
and MATCH_L. This internal switch matches the imped-
ance of the switch between H and W.
RATIO = 4
R
RATIO = 8
R
L
Table 1. Logic-Control Truth Table
DIGITAL INPUTS
D1
0
0
1
1
D0
0
1
0
1
GAIN
1
2
4
8
Figure 1. Simplified Functional Diagram
Detailed Description
The MAX5430/MAX5431 are digitally programmable pre-
cision resistor arrays. These devices have fixed resistor-
dividers with digitally controlled contacts, providing four
precision noninverting gains of 1, 2, 4, and 8 for PGA
applications (see
Functional Diagram
and Figure 1). The
MAX5430/MAX5431 achieve ratio accuracies of 0.025%
_______________________________________________________________________________________
5
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