MAX5430CEKA [MAXIM]
DIGITAL POTENTIOMETER|CMOS|TSSOP|8PIN|PLASTIC ; 数字电位器| CMOS | TSSOP | 8PIN |塑料\n
| 型号： | MAX5430CEKA |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | DIGITAL POTENTIOMETER|CMOS|TSSOP|8PIN|PLASTIC
|
| 文件： | 总7页 (文件大小：199K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2222; Rev 0; 10/01
15ꢀ Diꢁitallꢂ ꢃroꢁrammable
ꢃrecision ꢀoltaꢁe-Dividers for ꢃGAs
General Description
Features
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 resistor dividers,
digitally controlled contacts with four precision, noninvert-
ing 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.
ꢀ Four Noninverting PGA Gain Configurations:
A = 1, 2, 4, and 8
V
ꢀ Precision 0.025% Ratio Accuracy
ꢀ On-Chip Matching Resistor for Op Amp Bias-
Current Compensation (MAX5431)
ꢀ Single-Supply +12V to +15V, or Dual-Supply 12V
to 15V Operation
ꢀ Low 35µA Supply Current
ꢀ CMOS/TTL Logic Compatible 2-Wire Parallel
Interface
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).
ꢀ Space-Saving 8-Pin SOT23 and 10-Pin µMAX
Packages
ꢀ 3V Logic Compatibility
Orderinꢁ Information
Applications
General-Purpose Programmable Noninverting
Amplifier
TEMP.
RANGE
PIN-
GAIN
PART
PACKAGE ACCURACY
Programmable Instrumentation Amplifier
*MAX5430AEKA -40°C to +85°C 8 SOT23
*MAX5430BEKA -40°C to +85°C 8 SOT23
*MAX5430CEKA -40°C to +85°C 8 SOT23
MAX5431AEUB -40°C to +85°C 10 µMAX
MAX5431BEUB -40°C to +85°C 10 µMAX
MAX5431CEUB -40°C to +85°C 10 µMAX
0.025%
0.09%
0.5%
0.025%
0.09%
0.5%
*Future product—contact factory for availability.
ꢃin Confiꢁurations
Functional Diaꢁram
V
H
DD
TOP VIEW
V
MAX5430*
MAX5431
D0
D1
W
1
2
3
4
5
10
9
DD
W
MATCH_H
GND
MAX5431
D0
D1
8
DECODER
7
H
L
V
SS
MATCH_H
MATCH_L
6
MATCH_L
MAX
V
L
GND
SS
Pin Configurations continued at end of data sheet.
MAX5431 ONLY
________________________________________________________________ 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.
15ꢀ Diꢁitallꢂ ꢃroꢁrammable
ꢃrecision ꢀoltaꢁe-Dividers for ꢃGAs
ABSOLUTE MAXIMUM RATINGS
V
V
to GND............................................................-0.3V to +17V
to GND.............................................................-17V to +0.3V
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
DD
SS
D0, D1 to GND .........................................................-0.3V to +6V
H, L, W, MATCH_ to GND................(V - 0.3V) to (V + 0.3V)
SS
DD
Current Into Any Signal Pin............................................... 50mA
Continuous Power Dissipation (T = +70°C)
A
8-Pin SOT23 (derate 8.9mW/°C above +70°C)............714mW
10-Pin µMAX (derate 10.3mW/°C above +70°C).........825mW
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
= +15V, V = -15V, GND = 0, T = T
to T
. Typical values are at T = +25°C, unless otherwise noted)
MAX A
DD
SS
A
MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC PERFORMANCE
MAX543_A
0.025
0.09
0.5
Divider Ratio Accuracy
(Note 1)
V
= +5V, V = -5V
MAX543_B
MAX543_C
%
k
H
L
Resistance between H and L
(Figure 1)
R
57
2
HL
Capacitance at Analog Pins
Matching Resistor
C
pF
k
ANALOG
Ratio = 1
Ratio = 2, 4, 8
0.5
14
MAX5431 only
DIGITAL INPUTS
Input High Voltage
V
2.4
V
V
IH
Input Low Voltage
V
0.8
1
IL
Input Leakage Current
Input Capacitance
V
= 5V or GND
µA
pF
D__
C
5
IN
POWER REQUIREMENTS
Negative Supply Current
Positive Supply Current
Positive Power Supply Voltage
Negative Power Supply Voltage
I
1
25
60
µA
µA
V
SS
I
35
DD
V
10.8
15.75
0
DD
V
-15.75
V
SS
W, H, L, MATCH_H, MATCH _L
Voltage Range
V
V
V
V
ANALOG
SS
DD
DYNAMIC PERFORMANCE
Switching Time
t
0.3
µs
D2W, tH2W
Note 1: Gain accuracy is measured without load at pin W.
2
_______________________________________________________________________________________
15ꢀ Diꢁitallꢂ ꢃroꢁrammable
ꢃrecision ꢀoltaꢁe-Dividers for ꢃGAs
Tꢂpical Operatinꢁ Characteristics
(V
= +15V, V = -15V or V = GND, T = +25°C, unless otherwise noted.) (Note 2)
SS SS A
DD
MAX5431A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 2)
MAX5431A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 4)
MAX5431A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 1)
0.010
0.008
0.006
0.004
0.002
0
0.010
0.008
0.006
0.004
0.002
0
0.0020
0.0015
0.0010
0.0005
0
-0.002
-0.004
-0.006
-0.008
-0.010
-0.002
-0.004
-0.006
-0.008
-0.010
-0.0005
-0.0010
-0.0150
-0.0020
-40 -25 -10
5
20 35 50 65 80
-40 -25 -10
5
20 35 50 65 80
-40 -25 -10
5
20 35 50 65 80
TEMPERATURE ( C)
TEMPERATURE ( C)
TEMPERATURE ( C)
MAX5431B DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 2)
MAX5431A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 8)
MAX5431B DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 1)
0.005
0.004
0.003
0.002
0.001
0
0.010
0.008
0.010
0.008
0.006
0.004
0.002
0
0.006
0.004
0.002
0
-0.002
-0.004
-0.006
-0.008
-0.010
-0.001
-0.002
-0.003
-0.004
-0.005
-0.002
-0.004
-0.006
-0.008
-0.010
-40 -25 -10
5
20 35 50 65 80
-40 -25 -10
5
20 35 50 65 80
-40 -25 -10
5
20 35 50 65 80
TEMPERATURE ( C)
TEMPERATURE ( C)
TEMPERATURE ( C)
MAX5431A DIVIDER RATIO ACCURACY
MAX5431B DIVIDER RATIO ACCURACY
vs.TEMPERATURE (RATIO = 4)
MAX5431B DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 8)
vs. POSITIVE SUPPLY (V = -15V)
SS
0.0030
0.0025
0.002
0
0.010
0.008
RATIO 1
0.0020
0.0015
0.0010
0.0005
0
0.006
0.004
0.002
0
RATIO 8
RATIO 4
-0.002
-0.004
-0.006
-0.008
-0.010
-0.0005
-0.0010
0.0015
-0.002
-0.004
-0.006
-0.008
-0.010
RATIO 2
-0.0020
-0.0025
-0.0030
-40 -25 -10
5
20 35 50 65 80
11
12
13
14
15
-40 -25 -10
5
20 35 50 65 80
TEMPERATURE ( C)
POSITIVE SUPPLY (V)
TEMPERATURE ( C)
_______________________________________________________________________________________
3
15ꢀ Diꢁitallꢂ ꢃroꢁrammable
ꢃrecision ꢀoltaꢁe-Dividers for ꢃGAs
Tꢂpical Operatinꢁ Characteristics (continued)
(V
= +15V, V = -15V or V = GND, T = +25°C, unless otherwise noted.) (Note 2)
SS SS A
DD
MAX5431B DIVIDER RATIO ACCURACY
MAX5431B DIVIDER RATIO ACCURACY
MAX5431A DIVIDER RATIO ACCURACY
vs. POSITIVE SUPPLY (V = -15V)
vs. POSITIVE SUPPLY (V = 0V)
vs. POSITIVE SUPPLY (V = 0V)
SS
SS
SS
0.010
0.008
0.006
0.004
0.002
0
0.010
0.008
0.006
0.004
0.002
0
0.0020
0.0015
0.0010
0.0005
0
RATIO 8
RATIO 1
RATIO 1
RATIO 2
RATIO 1
-0.002
0.004
-0.006
-0.008
-0.010
-0.002
0.004
-0.006
-0.008
-0.010
-0.005
-0.0010
-0.0015
-0.0020
RATIO 2
RATIO 4
RATIO 8
RATIO 4
RATIO 8
RATIO 4
RATIO 2
11
12
13
14
15
11
12
13
POSITIVE SUPPLY (V)
14
15
11
12
13
14
15
POSITIVE SUPPLY (V)
POSITIVE SUPPLY (V)
MAX5431A DIVIDER RATIO ACCURACY
vs. NEGATIVE SUPPLY
MAX5431B DIVIDER RATIO ACCURACY
vs. NEGATIVE SUPPLY
POSITIVE SUPPLY CURRENT
vs. TEMPERATURE
0.0020
0.0015
0.0010
0.0005
0
0.010
0.008
0.006
0.004
0.002
0
30
25
20
15
10
5
D0, D1 = +5V
RATIO 1
RATIO 8
RATIO 1
-0.002
0.004
-0.006
-0.008
-0.010
-0.0005
-0.0010
-0.0015
-0.0020
RATIO 4
RATIO 8
RATIO 4
-12
RATIO 2
RATIO 2
D0, D1 = 0V
0
-15
-12
-9
-6
-3
0
-40 -25 -10
5
20 35 50 65 80 95 110 125
-15
-9
-6
-3
0
NEGATIVE SUPPLY (V)
NEGATIVE SUPPLY (V)
Note 2: For MAX543_C accuracy Typical Operating Characteristics, refer to MAX543_B accuracy Typical Operating Characteristics.
4
_______________________________________________________________________________________
15ꢀ Diꢁitallꢂ ꢃroꢁrammable
ꢃrecision ꢀoltaꢁe-Dividers for ꢃGAs
ꢃin Description
PIN
NAME
FUNCTION
MAX5431
MAX5430
4
8
6
3
H
W
L
High Terminal of Resistor-Divider
Wiper Terminal of Resistor-Divider
Low Terminal of Resistor-Divider
Negative Power Supply
5
5
7
4
V
SS
2
—
—
7
MATCH_H
MATCH_L
GND
Matching Resistor High Terminal
Matching Resistor Low Terminal
Ground
6
3
9
2
D1
Second Bit Digital Input (MSB) (Table 1)
First Bit Digital Input (LSB) (Table 1)
Positive Power Supply
10
1
1
D0
8
V
DD
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).
H
RATIO = 1
The end-to-end resistance from H to L is 57k . The
impedance seen at W is designed to be the same 14k
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 500 .
R2B
R1B
R3B
RATIO = 2
Matchinꢁ Resistor (MAX5431)
The MAX5431 includes a matching resistor to compen-
sate for 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, the 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
RATIO = 8
W
R3A
R2A
R1A
R_B
R_A
RATIO =
1+
( )
Table 1. Logic Control Truth Table
DIGITAL INPUTS
GAIN
L
D1
0
D0
0
Figure 1. Simplified Functional Diagram
1
2
4
8
0
1
Detailed Description
1
0
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
1
1
_______________________________________________________________________________________
5
15ꢀ Diꢁitallꢂ ꢃroꢁrammable
ꢃrecision ꢀoltaꢁe-Dividers for ꢃGAs
Diꢁital 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.
+15V
+15V
Applications Information
V
W
DD
ꢃroꢁrammable-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).
H
MAX5430
V
L
GND
SS
ꢃower Supplies and Bꢂpassinꢁ
The MAX5430/MAX5431 operate from dual 15V sup-
plies or a single +15V supply. For dual supplies,
Figure 3. Programmable-Gain Amplifier Using the MAX5430
bypass V
and V with 0.1µF ceramic capacitors to
SS
DD
Functional Diaꢁram
GND. For single supply, connect V
to GND and
SS
bypass V
with a 0.1µF ceramic capacitor to GND.
DD
V
H
DD
Switchinꢁ Time and Laꢂout 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
W
D0
D1
DECODER
MATCH_H
MATCH_L
V
L
GND
SS
MAX5431 ONLY
+15V
+15V
V
DD
ꢃin Confiꢁurations (continued)
MATCH_H
MATCH_L
TOP VIEW
MAX5431
W
H
V
D0
D1
W
DD
1
2
3
4
8
7
6
5
MAX5430
GND
H
V
L
GND
SS
L
V
SS
SOT23
Figure 2. MAX5431 Typical Application Circuit
Chip Information
TRANSISTOR COUNT: 121
PROCESS: CMOS
6
_______________________________________________________________________________________
15ꢀ Diꢁitallꢂ ꢃroꢁrammable
ꢃrecision ꢀoltaꢁe-Dividers for ꢃGAs
ꢃackaꢁe Information
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.
Maxim Inteꢁrated ꢃroducts, 120 San Gabriel Drive, Sunnꢂvale, CA 94086 408-737-7600 _____________________ 7
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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