Maxim launches the MAX4208 / MAX4209H instrument amplifier that uses the company's patented current feedback architecture to make self-tune zero technology. This new type of self-tune technology continues to measure and correct input offset voltage, thereby eliminating time and temperature drift. The input offset voltage is 20 when + 25 ° C? V (maximum), 40 ° C to + 125 ° C temperature range is 40? V (max). Compact design technology enables MAX4208 / MAX4209H to be encapsulated in small size, 3mm × 5mm? MAX package makes it suitable for a variety of applications. This amplifier monitors the laptop core, the low voltage supply current of the ASIC, and the microprocessor. The amplifier can also be used in automotive, industrial and medical instruments. MAX4208 / MAX4209H adopts innovative, double-cross-conversion amplifier architecture. This indirect current feedback architecture enables the user to make full use of all dynamic ranges of the input differential signal, even if the common mode signal is close, or less than the ground potential. The MAX4208 / MAX4209H has a true detection function and the input common mode voltage range of -0.1V to VDD-1.3V. CMRR is guaranteed at least 106dB. The input stage of the device uses a CMOS transistor with 1 Pa (typical value) input bias current. The input offset voltage is 20 when + 25 ° C? V (max), 30 when + 85 ° C? V (max), 40 ° C to + 125 ° C is 40? V (max). The MAX4208 has an adjustable gain, which can adjust the gain (g = 1 + r2 / r1) by setting the proportional ratio of external resistance. The MAX4209H uses internal laser fine-tuning resistor settings to set the gain to fixed 100 times. The maximum gain error of MAX4209H is ± 0.25% at + 85 ° C, which is ± 0.35% in the temperature range of +40 ° C to + 125 ° C. The MAX4208 / MAX4209H also comes with a self-tuning-based buffer amplifier that allows the output to translate the output to VDD / 2 with a simple resistance divider or external reference input. It has the smallest load error. The buffer improves system accuracy, which is very useful for bipolar signals in single power applications. High-resistance input is optimized for small signal differential voltage (± 100 mV). All devices operate at 2.85V to 5.5V single power (or ± 1.425V to ± 2.75V dual power), have a ground detection function and ultra low, 1PA (typ) CMOS input bias current. Therefore, the MAX4208 / MAX4209H amplifier has the following advantages: 1) Activity and capacitive bridge sensor that detects pressure and position in automotive and industrial applications, and is used to drive an analog-to-digital converter (ADC). Low offset voltage and low offset drift can achieve large gain under small DC errors, thereby providing better performance. CMOS input also enables the device to interface with a variety of capacity and other high-resistance sensor interfaces. 2) The MAX4209H is used as an accurate low or low-voltage insulation amplifier with very small detection voltage (10 mV) and detection resistors. This design is used to monitor the kernel, ASIC, and microprocessor currents of the laptop. The low VSENSE pressure drop reduces power consumption in the detection resistance, reducing hotspots, thereby achieving higher efficiency. 3) MAX4208 / MAX4209H is suitable for a variety of medical instruments, such as cardiac monitors and defibrillators. Editor in charge: GT, read full text
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