EVALUATION KIT AVAILABLE MAX4208/MAX4209 Ultra-Low Offset/Drift, Precision Instrumentation Amplifiers with REF Buffer General Description Benefits and Features The MAX4208/MAX4209 ultra-low offset and drift instrumen- Spread-Spectrum, Auto-Zero Instrumentation tation amplifiers feature exceptional precision specifications, Amplifiers Improve DC Characteristics to Maximize low power consumption, rail-to-rail output, excellent gain- Sensor Performance bandwidth product, and buffered REFIN/MODE input in a Input Offset Voltage: 20V (max) at +25C very small MAX package. These devices use a spread- 0.25% (max) Gain Error spectrum, autozeroing technique that constantly measures Low 0.2V/C Offset Voltage Drift and corrects the input offset, eliminating drift over time 1pA CMOS Input Bias Current and temperature and the effect of 1/f noise. This technique True Ground Sensing with Rail-to-Rail Output achieves less than 20V offset voltage, allows ground-sens- 750kHz Gain-Bandwidth Product ing capability, provides ultra-low CMOS input bias current Buffered REF Input for High Accuracy and Bipolar and increased common-mode rejection performance. Operation The MAX4208/MAX4209 provide high-impedance inputs Low Power Operation Supports Remote Sensing and optimized for small-signal differential voltages (100mV). Battery-Powered Applications All devices provide a gain-bandwidth product of 750kHz. 2.85V to 5.5V Single-Supply Operation (or 1.425V The MAX4208 provides an adjustable gain with two exter- to 2.75V Dual Supplies) nal resistors or unity gain with FB connected to OUT. The 750A Supply Current MAX4209 is available with a fixed gain of 100V/V with 1.4A Shutdown Mode 0.03% (typ) accuracy. Both devices include a reference input (REF) to level-shift the output, allowing for bipolar sig- Adjustable (MAX4208) and Fixed Gain of 100 nals in single-supply applications. In both devices, REFIN/ (MAX4209) Provide Design Flexibility MODE is an input to a precision unity-gain buffer, which sets the REF voltage to level-shift the output. The internal Ordering Information REF buffer allows the reference to be set by a simple resis- PIN- GAIN tive divider or an ADC reference without any loading error. PART TEMP RANGE PACKAGE (V/V) The MAX4208/MAX4209 operate with a 2.85V to 5.5V MAX4208AUA+T -40C to +125C 8 MAX ADJ single-supply voltage and consume only 750A of qui- escent current (when the internal buffer is off) and only MAX4209HAUA+T -40C to +125C 8 MAX 100 1.4A in shutdown mode. These amplifiers also operate +Denotes a lead(Pb)-free/RoHS-compliant package. with 2.5V dual supplies with REF connected to ground T = Tape and reel. and REFIN/MODE to V . The MAX4208/MAX4209 are SS available in space-saving 8-pin MAX packages and Typical Application Circuit are specified over the automotive operating temperature range (-40C to +125C). 5V Applications R4 Strain-Gauge Amplifiers V /2 IN- Industrial Process Control DD V Battery-Powered Medical Equipment DD IN+ R3 OUT Precision Low-Side Current Sense REFIN/MODE Notebook Computers REF Differential Voltage Amplification V SS R2 C FB FB MAX4208 FB R1 R2 G = 1 + R1 REF BUFFER OUT = V /2 MAX is a registered trademark of Maxim Integrated Products, Inc. DD 19-0924 Rev 3 5/15MAX4208/MAX4209 Ultra-Low Offset/Drift, Precision Instrumentation Amplifiers with REF Buffer Absolute Maximum Ratings V to V ..............................................................-0.3V to +6V Operating Temperature Range ......................... -40C to +125C DD SS All Other Pins ................................(V - 0.3V) to (V + 0.3V) Junction Temperature ......................................................+150C SS DD OUT Short-Circuit Duration .......................................Continuous Storage Temperature Range ............................ -65C to +150C Current Into OUT, V , and V .....................................25mA Lead Temperature (soldering, 10s) .................................+300C DD SS Current Into Any Other Pin ...............................................20mA Continuous Power Dissipation (T = +70C) A MAX (derate 4.5mW/C above +70C) .....................362mW 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, V = 0V, V = V = V /2, V = V , R = 100k to V /2, V = (V - V ) = 0V, MAX4208 set for DD SS CM REF DD REFIN/MODE SS L DD DIFF IN+ IN- G = 100V/V (R1 = 1k, R2 = 99k), T = +25C, unless otherwise noted.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT DC CHARACTERISTICS MAX4208, G = 100V/V 3 20 Input Offset Voltage V V OS MAX4209H, G = 100V/V 3 20 Input Bias Current I -100mV V +100mV (Note 3) 1 pA B DIFF Input Offset Current I -100mV V +100mV (Note 3) 1 pA OS DIFF Differential mode 2 Input Resistance R V = V /2 G IN CM DD Common mode 2 -20mV V +20mV DIFF 0.05 0.25 MAX4208, G = 100V/V Gain Error % -20mV V +20mV DIFF 0.05 0.25 MAX4209H, G = 100V/V MAX4208, G = 100V/V 25 150 Gain Nonlinearity ppm (Note 2) MAX4209H, G = 100V/V 25 150 Input Common-Mode Range V Guaranteed by CMRR test V - 0.1 V - 1.30 V CM SS DD Input Common-Mode Rejection CMRR V = (V - 0.1V) to (V - 1.30V) 106 135 dB CM SS DD Ratio Maxim Integrated 2 www.maximintegrated.com