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MAX5430AEKA+T

P1-P3P4-P6P7-P7
MAX5430/MAX5431
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
4 _______________________________________________________________________________________
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)
-0.010
-0.004
-0.006
-0.008
-0.002
0
0.002
0.004
0.006
0.008
0.010
11 12 13 14 15
MAX543_B DIVIDER RATIO ACCURACY
vs. POSITIVE SUPPLY (V
SS
= -15V)
MAX5430 toc10
POSITIVE SUPPLY (V)
DIVIDER RATIO ACCURACY (%)
RATIO 2
RATIO 4
RATIO 1
RATIO 8
11 12 13 14 15
MAX543_A DIVIDER RATIO ACCURACY
vs. POSITIVE SUPPLY (V
SS
= 0V)
MAX5430 toc11
POSITIVE SUPPLY (V)
DIVIDER RATIO ACCURACY (%)
RATIO 2
RATIO 4
RATIO 1
RATIO 8
-0.010
-0.004
-0.006
-0.008
-0.002
0
0.002
0.004
0.006
0.008
0.010
V
L
= 0
-0.010
-0.004
-0.006
-0.008
-0.002
0
0.002
0.004
0.006
0.008
0.010
11 12 13 14 15
MAX543_B DIVIDER RATIO ACCURACY
vs. POSITIVE SUPPLY (V
SS
= 0V)
MAX5430 toc12
POSITIVE SUPPLY (V)
DIVIDER RATIO ACCURACY (%)
RATIO 2
RATIO 4
RATIO 1
RATIO 8
V
L
= 0
-15 -12 -6-9
-3
0
MAX543_A DIVIDER RATIO ACCURACY
vs. NEGATIVE SUPPLY
MAX5430 toc13
NEGATIVE SUPPLY (V)
DIVIDER RATIO ACCURACY (%)
-0.010
-0.004
-0.006
-0.008
-0.002
0
0.002
0.004
0.006
0.008
0.010
RATIO 2
RATIO 1
RATIO 8
RATIO 4
V
L
= 0
0
10
5
20
15
25
30
-40 -10 5 20-25 35 50 65 80
SUPPLY CURRENT
vs. TEMPERATURE
MAX5430 toc15
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
D0, D1 = 0V
D0, D1 = 5V
Note 3: For MAX543_C accuracy Typical Operating Characteristics, refer to MAX543_B accuracy Typical Operating Characteristics.
-15 -12 -6-9
-3
0
MAX543_B DIVIDER RATIO ACCURACY
vs. NEGATIVE SUPPLY
MAX5430 toc14
NEGATIVE SUPPLY (V)
DIVIDER RATIO ACCURACY (%)
-0.010
-0.004
-0.006
-0.008
-0.002
0
0.002
0.004
0.006
0.008
0.010
RATIO 2
RATIO 1
RATIO 8
RATIO 4
MAX5430/MAX5431
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
_______________________________________________________________________________________ 5
Pin Description
PIN
MAX5431 MAX5430
NAME FUNCTION
18V
DD
Positive Power Supply
2—
MATCH_H
Matching Resistor High Terminal
37GND Ground
46HHigh Terminal of Resistive-Divider
55LLow Terminal of Resistive-Divider
6—
MATCH_L
Matching Resistor Low Terminal
74V
SS
Negative Power Supply
83WWiper Terminal of Resistive-Divider
92D1 Second Bit Digital Input (MSB) (Table 1)
10 1 D0 First Bit Digital Input (LSB) (Table 1)
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%
(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. In
a gain of 1 configuration, H is internally connected to W
with a typical resistance of 500Ω.
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.
Figure 1. Simplified Functional Diagram
4R
2R
RATIO = 2
RATIO = 1
R
L
W
H
RATIO = 4
RATIO = 8
R
DIGITAL INPUTS
D1 D0
GAIN
00 1
01 2
10 4
11 8
Table 1. Logic-Control Truth Table
Digital Interface Operation
The MAX5430/MAX5431 feature a simple two-bit paral-
lel programming interface. D1 and D0 program the gain
setting according to the Logic-Control Truth Table (see
Table 1). The digital interface is CMOS/TTL logic com-
patible.
Applications Information
Programmable-Gain Amplifier
The MAX5430/MAX5431 are ideally suited for high-pre-
cision PGA applications. The typical application circuit
of Figure 2 uses the MAX5431 with matching resistor to
compensate for voltage offset due to op amp input bias
currents. Use the MAX5430 with an ultra-low input bias
current op amp (see Figure 3).
Power Supplies and Bypassing
The MAX5430/MAX5431 operate from dual ±15V sup-
plies or a single 15V supply. For dual supplies, bypass
V
DD
and V
SS
with 0.1µF ceramic capacitors to GND.
For single supply, connect V
SS
to GND and bypass
V
DD
with a 0.1µF ceramic capacitor to GND.
Switching Time and Layout Concerns
The switching time of the MAX5430/MAX5431 depends
on the capacitive loading at W. For best performance,
reduce parasitic board capacitance by minimizing the
circuit board trace from W to the op amp inverting input,
and choose an op amp with low input capacitance.
MAX5430/MAX5431
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
6 _______________________________________________________________________________________
15V
MATCH_L
W
H
15V
MATCH_H
V
SS
V
DD
GNDL
MAX5431
V
IN
V
OUT
15V
W
H
15V
V
SS
V
DD
GNDL
MAX5430
V
IN
V
OUT
Figure 2. MAX5431 Typical Application Circuit PGA with Input
I
BIAS
Matching
Figure 3. Programmable-Gain Amplifier Using the MAX5430
1
2
8
7
SOT23
TOP VIEW
3
4
6
5
MAX5430
V
DD
D0
V
SS
L
H
W
D1 GND
Pin Configurations (continued)
Chip Information
TRANSISTOR COUNT: 121
PROCESS: CMOS
P1-P3P4-P6P7-P7

MAX5430AEKA+T

Mfr. #:
Buy MAX5430AEKA+T
Manufacturer:
Maxim Integrated
Description:
Digital Potentiometer ICs Precision Voltage Divider for PGAs
Lifecycle:
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