MAX5430AEKA+T [MAXIM]
Analog Circuit, 1 Func, CMOS, PDSO8, SOT-23, 8 PIN;
| 型号： | MAX5430AEKA+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Analog Circuit, 1 Func, CMOS, PDSO8, SOT-23, 8 PIN |
| 文件： | 总7页 (文件大小：178K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2222; Rev 1; 1/02
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 suppliesꢀ and consume only 35ꢁA 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 1ꢀ 2ꢀ 4ꢀ
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
ꢀ Space-Saving 8-Pin SOT23 and 10-Pin µMAX
Packages
The MAX5430/MAX5431 are available in space-saving
8-pin SOT23 and 10-pin ꢁMAX packagesꢀ and speci-
fied over the extended temperature range of (-40°C to
+85°C).
ꢀ 3V Logic Compatibility
Applications
Orderinꢁ Information
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%
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.) (Note 1)
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 2)
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
W, H, L, MATCH_H, MATCH _L
Voltage Range
V
V
V
V
ANALOG
SS
DD
DIGITAL INPUTS
Input High Voltage
V
2.4
V
V
IH
Input Low Voltage
V
0.8
1
IL
Input Leakage Current
Input Capacitance
D0, D1 = 5V or GND
µA
pF
C
5
IN
POWER REQUIREMENTS
Negative Supply Current
I
1
25
60
µA
µA
V
SS
Positive Supply Current
I
35
DD
Positive Power-Supply Voltage
Negative Power-Supply Voltage
DYNAMIC PERFORMANCE
V
10.8
15.75
0
DD
V
-15.75
V
SS
Switching Time
t
t
0.3
µs
D2W, H2W
Note 1: All devices are 100% production tested at T = +25°C. SOT23 packages are guaranteed by design from T = T
to T
MAX.
A
A
MIN
Note 2: 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, V = 5V, V =-5V, T = 25°C, unless otherwise noted.) (Note 3)
DD
SS
SS
H
L
A
MAX543_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 2)
MAX543_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 4)
MAX543_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 1)
0.010
0.010
0.0020
0.008
0.006
0.004
0.002
0.008
0.006
0.004
0.002
0
0.0015
0.0010
0.0005
0
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
-0.0015
-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)
MAX543_B DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 2)
MAX543_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 8)
MAX543_B DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 1)
0.020
0.015
0.010
0.010
0.0020
0.0015
0.0010
0.0005
0.008
0.006
0.004
0.002
0.005
0
0
-0.002
-0.004
0
-0.0005
-0.0010
-0.005
-0.010
-0.015
-0.020
-0.006
-0.008
-0.010
-0.0015
-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
65 80
50
TEMPERATURE ( C)
TEMPERATURE ( C)
TEMPERATURE ( C)
MAX543_A DIVIDER RATIO ACCURACY
MAX543_B DIVIDER RATIO ACCURACY
vs.TEMPERATURE (RATIO = 4)
MAX543_B DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 8)
vs. POSITIVE SUPPLY (V = -15V)
SS
0.010
0.008
0.006
0.004
0.002
0.010
0.008
0.006
0.004
0.002
0
0.010
0.008
RATIO 2
0.006
0.004
0.002
0
RATIO 1
0
-0.002
-0.004
-0.002
-0.004
-0.006
-0.008
-0.010
-0.002
-0.004
-0.006
-0.008
-0.010
RATIO 4
RATIO 8
-0.006
-0.008
-0.010
-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, V = 5V, V =-5V, T = 25°C, unless otherwise noted.) (Note 3)
DD
SS
SS
H
L
A
MAX543_B DIVIDER RATIO ACCURACY
MAX543_B DIVIDER RATIO ACCURACY
MAX543_A 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
0.010
V = 0
L
V = 0
L
0.008
0.006
0.004
0.002
0
RATIO 2
RATIO 4
RATIO 2
RATIO 4
RATIO 2
RATIO 1
RATIO 4
RATIO 8
RATIO 1
RATIO 8
RATIO 1
-0.002
-0.004
-0.006
-0.008
-0.010
-0.002
-0.004
-0.006
-0.008
-0.010
-0.002
-0.004
-0.006
-0.008
-0.010
RATIO 8
11
12
13
14
15
11
12
13
14
15
11
12
13
14
15
POSITIVE SUPPLY (V)
POSITIVE SUPPLY (V)
POSITIVE SUPPLY (V)
MAX543_A DIVIDER RATIO ACCURACY
vs. NEGATIVE SUPPLY
MAX543_B DIVIDER RATIO ACCURACY
vs. NEGATIVE SUPPLY
SUPPLY CURRENT
vs. TEMPERATURE
0.010
0.008
0.006
0.004
0.002
0
0.010
0.008
0.006
0.004
0.002
0
30
25
20
15
10
5
V = 0
L
D0, D1 = 5V
RATIO 2
RATIO 4
RATIO 2
RATIO 1
RATIO 4
RATIO 8
RATIO 1
-0.002
-0.004
-0.006
-0.008
-0.010
-0.002
-0.004
-0.006
-0.008
-0.010
RATIO 8
-9
D0, D1 = 0V
0
-15
-12
-6
0
-3
-40 -25 -10
5
20 35 50 65 80
-15
-12
-9
-6
0
-3
NEGATIVE SUPPLY (V)
TEMPERATURE ( C)
NEGATIVE SUPPLY (V)
Note 3: 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
1
2
8
—
7
V
Positive Power Supply
DD
MATCH_H
Matching Resistor High Terminal
Ground
3
GND
4
6
H
L
High Terminal of Resistive-Divider
Low Terminal of Resistive-Divider
Matching Resistor Low Terminal
Negative Power Supply
5
5
6
—
4
MATCH_L
7
V
SS
8
3
W
Wiper Terminal of Resistive-Divider
9
2
D1
D0
Second Bit Digital Input (MSB) (Table 1)
First Bit Digital Input (LSB) (Table 1)
10
1
(MAX5430A/MAX5431A), 0.09% (MAX5430B/MAX5431B),
or 0.5% (MAX5430C/MAX5431C).
H
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 .
RATIO = 1
RATIO = 2
4R
2R
Matchinꢁ 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.
W
RATIO = 4
RATIO = 8
R
R
Table 1. Logic-Control Truth Table
L
DIGITAL INPUTS
GAIN
Figure 1. Simplified Functional Diagram
D1
0
D0
0
1
2
4
8
Detailed Description
0
1
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%
1
0
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
V
IN
V
OUT
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
SS
L
GND
ꢃower Supplies and Bꢂpassinꢁ
The MAX5430/MAX5431 operate from dual 15V sup-
plies or a single 15V supply. For dual supplies, bypass
Figure 3. Programmable-Gain Amplifier Using the MAX5430
V
and V
with 0.1µF ceramic capacitors to GND.
SS
DD
For single supply, connect V
to GND and bypass
SS
V
DD
with a 0.1µF ceramic capacitor to GND.
ꢃin Confiꢁurations (continued)
Switchinꢁ Time and Laꢂout Concerns
TOP VIEW
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.
V
D0
D1
W
DD
1
2
3
4
8
7
6
5
MAX5430
GND
H
L
V
SS
SOT23
Chip Information
15V
15V
TRANSISTOR COUNT: 121
PROCESS: CMOS
V
DD
MATCH_H
MATCH_L
V
IN
V
OUT
MAX5431
W
H
V
L
GND
SS
Figure 2. MAX5431 Typical Application Circuit
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
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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