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PDF MAX5431 Data sheet ( Hoja de datos )
| Número de pieza | MAX5431 | |
| Descripción | +-15V Digitally Programmable Precision Voltage-Dividers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-2222; Rev 1; 1/02
www.DataSheet4U.com
±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:
AV = 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
Applications
General-Purpose Programmable Noninverting
Amplifier
Programmable Instrumentation Amplifier
Ordering Information
PART
TEMP
RANGE
PIN-
GAIN
PACKAGE ACCURACY
MAX5430AEKA -40°C to +85°C 8 SOT23
0.025%
MAX5430BEKA -40°C to +85°C 8 SOT23
0.09%
MAX5430CEKA -40°C to +85°C 8 SOT23
0.5%
MAX5431AEUB -40°C to +85°C 10 µMAX 0.025%
MAX5431BEUB -40°C to +85°C 10 µMAX
0.09%
MAX5431CEUB -40°C to +85°C 10 µMAX
0.5%
Functional Diagram
VDD H
MAX5430
MAX5431
D0
D1
MATCH_H
MATCH_L
DECODER
MAX5431 ONLY
VSS GND L
W
Pin Configurations
TOP VIEW
VDD 1
MATCH_H 2
GND 3
H4
L5
MAX5431
10 D0
9 D1
8W
7 VSS
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.
1 page  
www.DataShe
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
PIN
MAX5431
1
2
3
4
5
6
7
8
9
10
MAX5430
8
—
7
6
5
—
4
3
2
1
NAME
FUNCTION
VDD
MATCH_H
GND
H
L
MATCH_L
VSS
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)
Pin Description
H
4R
2R
R
R
RATIO = 1
RATIO = 2
RATIO = 4
RATIO = 8
W
(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.
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.
L
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%
Table 1. Logic-Control Truth Table
DIGITAL INPUTS
D1 D0
00
01
10
11
GAIN
1
2
4
8
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet MAX5431.PDF ] | |
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