Document
19-2222; Rev 1; 1/02
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±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 resistor-dividers. Each device has digitally controlled contacts 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 specified 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 BiasCurrent 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 PINGAIN 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
VDD MAX5430 MAX5431 D0 DECODER D1 MATCH_H MATCH_L VSS GND L MAX5431 ONLY H
Pin Configurations
TOP VIEW
VDD 1 10 D0
W
MATCH_H 2 GND 3 H 4 L 5
MAX5431
9 D1 8 W 7 VSS 6 MATCH_L
µMAX Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
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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.
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±15V Digitally Programmable Precision Voltage-Dividers for PGAs MAX5430/MAX5431
ABSOLUTE MAXIMUM RATINGS
VDD to GND ............................................................-0.3V to +17V VSS to GND.............................................................-17V to +0.3V D0, D1 to GND .........................................................-0.3V to +6V H, L, W, MATCH_ to GND ................(VSS - 0.3V) to (VDD + 0.3V) Current Into Any Signal Pin...............................................±50mA Continuous Power Dissipation (TA = +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
(VDD = +15V, VSS = -15V, GND = 0, TA = TMIN to TMAX. Typical values are at TA = +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 tD2W, tH2W 0.3 µs ISS IDD VDD VSS 10.8 -15.75 1 35 25 60 15.75 0 µA µA V V CIN VIH VIL D0, D1 = 5V or GND 5 2.4 0.8 ±1 V V µA pF VANALOG RHL CANALOG MAX5431 only Ratio = 1 Ratio = 2, 4, 8 VSS VH = +5V, VL = -5V MAX543_B MAX543_C 57 2 0.5 14 VDD 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 TA = +25°C. SOT23 packages are guaranteed by design from TA = TMIN to TMAX. Note 2: Gain accuracy is measured without load at pin W.
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±15V Digitally Programmable Precision Voltage-Dividers for PGAs
Typical Operating Characteristics
(VDD = +15V, VSS = -15V or VSS = GND, VH = 5V, VL =-5V, TA = 25°C, un.