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AM467 데이터시트(PDF) 5 Page - Analog Devices |
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AM467 데이터시트(HTML) 5 Page - Analog Devices |
5 / 9 page Precision amplifier for bridge circuits AM467 analog microelectronics February 2011 Analog Microelectronics GmbH Phone: +49 (0)6131/91 073 – 0 5/9 An der Fahrt 13, D – 55124 Mainz Fax: +49 (0)6131/91 073 – 30 Rev. 1.1 Internet: http://www.analogmicro.de Email: info@analogmicro.de EXTERNAL COMPONENTS Parameter Symbol Conditions Min. Typ. Max. Unit Output Capacitor C1 1 5 nF Compensation Capacitor C2 80 100 120 pF Stabilization Capacitor (optional) C3 100 nF EMV Protection Capacitor (optional) C4 470 pF Load Resistor to GND, to VCC RL Vout = max. Vout 20 k Ω Table 2: External components of the calibration network (see figure 2) Recommended: ceramic capacitors DESCRIPTION OF FUNCTIONS AM467 is an integrated precision circuit for the signal amplification of high- and medium impedance signal sources and for the signal conditioning of sensor (resistor) bridges with low sensitivity, particularly for ceramic and DMS sensing elements or GMR measuring cells. The IC is able to generates a rail-to-rail output signal of 0.2 V to Vcc-0.2 V. The output signal is adjustable in offset and span. The amplification and offset can be set independently of one another using external resistors. Through the suitable dimensioning of external resistors in particular an output voltage of 0.5...4.5 V can also be provided. As these values are standard the following description refers to this output voltage. AM467 works on the principle of ratiometry with a supply voltage of 5 V ±5%. The IC is distinguished by its low offset and extremely low thermal offset drift across a wide temperature range, enabling it to be classified as a precision amplifier. The sink and source output stage is protected internally against short-circuiting. The AM467 design incorporates protective measures against interference from EMV and ESD using suitable semiconductor structures. AM467 can be used as an autonomous signal conditioning IC or as a preamplifier for an A/D converter for digital signal conditioning. For higher output voltages e.g. 10Volt or 2(3)-wire current output, this IC can be combined with the analog interface circuits of Analog Microelectronics (e.g. AM461 and AM460) EXAMPLE APPLICATION AM457 is suitable for the amplification of resistance networks connected up as a Wheatstone bridge with four resistors and which have a low sensitivity, such as 1.0 to 3.5 mV/V with a 5 V supply, for example. By way of example a sensor application is described herein which is |
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