MAX5420/MAX5421 19-2230 Rev 2 2/05 Digitally Programmable Precision Voltage Divider for PGAs General Description Features The MAX5420 and MAX5421 are digitally programmable Four Precision Divider Ratios For Noninverting precision voltage dividers optimized for use in digitally pro- Gains of 1, 2, 4, and 8 in PGAs grammable gain amplifier configurations. The MAX5420/ 0.025%, 0.09%, or 0.5% Ratio Accuracy MAX5421 operate from a single +5V supply or dual 5V supply, and consume only 3A supply current. These Guaranteed Over -40C to +85C devices consist of a digitally selectable resistor array that On-Chip Matching Resistor for Op Amp Bias- provides four precision noninverting gains of 1, 2, 4, and 8 Current Compensation (MAX5421) for PGAs. The MAX5420 and MAX5421 achieve a resistor ratio accuracy of 0.025% (MAX542 A), 0.09% (MAX542 B), 5V Single or 5V Dual Supply Operation and 0.5% (MAX542 C). The MAX5421 includes an on-chip Low 3A Supply Current matching resistor for op amp bias-current compensation. CMOS/TTL Logic Compatible 2-Wire Parallel The MAX5420 and MAX5421 are available in 8-pin and Interface 10-pin MAX packages. The devices are specified over the extended temperature range (-40C to +85C). Small 8-Pin and 10-Pin MAX Packages Applications Ordering Information General-Purpose Programmable Noninverting Amplifiers TEMP. PIN- GAIN PART RANGE PACKAGE ACCURACY Programmable Instrumentation Amplifiers MAX5420AEUA -40C to +85C 8 MAX 0.025% MAX5420BEUA -40C to +85C 8 MAX 0.09% MAX5420CEUA -40C to +85C 8 MAX 0.5% MAX5421AEUB -40C to +85C 10 MAX 0.025% MAX5421BEUB -40C to +85C 10 MAX 0.09% MAX5421CEUB -40C to +85C 10 MAX 0.5% Pin Configurations Functional Diagram TOP VIEW V 1 8 H DD V H DD V 2 7 W SS MAX5420 MAX5420 GND 3 6 L MAX5421 W D0 4 5 D1 D0 DECODER MAX-8 D1 MATCH H V 1 10 H MATCH L DD V 2 9 W SS V GND L SS MAX5421 GND 3 8 L MAX5421 ONLY D0 4 7 MATCH H D1 5 6 MATCH L MAX-10 Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Digitally Programmable Precision Voltage Divider for PGAs ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) DD A V to GND...............................................................+0.3V to -6V 8-Pin MAX (derate 4.1mW/C above +70C) .............333mW SS D0, D1 to GND ...........................................-0.3V to (V + 0.3V) 10-Pin MAX (derate 5.6mW/C above +70C) ...........444mW DD H, L, W, MATCH to GND................(V - 0.3V) to (V + 0.3V) Operating Temperature Range ...........................-40C to +85C SS DD Input and Output Latchup Immunity.................................50mA Storage Temperature Range .............................-60C to +150C Lead Temperature (soldering, 10s) .................................+300C 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 = +5V 5%, V = -5V 5% or V = GND, T = T to T , unless otherwise noted. Typical values are at T = +25C.) DD SS SS A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS MAX542 A 0.025 Divider Ratio Accuracy MAX542 B 0.09 % MAX542 C 0.5 H-to-L Resistance R (Figure 1) 15 k HL k Input Resistance at H R 15 H V = -5V 300 SS Ratio = 1 Input Resistance at W R V = 0 500 W SS Ratio = 2, 4, 8 8 k Capacitance at H, L, W, C 5pF ANALOG MATCH H, MATCH L V = -5V 300 SS Ratio = 1 Matching Resistor MAX5421 V = 0 500 SS Ratio = 2, 4, 8 8 k DYNAMIC PERFORMANCE V = + 5V, V = - 5V, d i g i tal i np ut 0 to + 3V, D D S S Switching Time t V settles to 0.02% of fi nal va lue w i th 2pF 0.5 s S W cap aciti ve l oad . Ci r cuit o f Fig ure 2. DIGITAL INPUTS Input High Voltage V 2.4 IH V Input Low Voltage V 0.8 IL Input Leakage Current D1, D0 = V or GND 1 A DD Input Capacitance 5pF 2 MAX5420/MAX5421