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AM417 Folha de dados(PDF) 6 Page - Analog Devices |
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AM417 Folha de dados(HTML) 6 Page - Analog Devices |
6 / 18 page AM417 – Ratiometric instrumentation amplifier with adjustable output stage Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz July 2008 –Rev 3.1- Page 6/18 Phone:+49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: info@analogmicro.de DESCRIPTION OF FUNCTIONS AM417 is a ratiometric, adjustable interface IC which has been specially developed for the conditioning of bridge signals for automotive applications. With its integrated, ratiometric current source it is particularly suitable for the excitation of piezoresistive bridge devices in a constant current mode. The IC enables simple calibration and temperature compensation of the input signals. AM417 consist of three functional units: Instrumentation amplifier Using the input stage of the instrumentation amplifier (IA) the input signal is preamplified by GIA = 10. The IA can only process positive input signals. A negative input voltage or negative input offset must be balanced by using additional resistor at positive input pin VIN+ (c.f. Setting the output offset). Current source The additional operational amplifier (OP) is linked internally to supply voltage VCC via a voltage divider (10:1). With the OP acting as a ratiometric current source a resistor measuring cell can be supplied with constant current within a range of 0.5 – 1.25mA. The supply current of the external sensing element IIB can be set by varying resistor R1 at the minus input of the OP (VIN-) using the following ratio: 1 10 R V I VCC IB = (1) Output stage A voltage amplifier with an external PNP open collector stage (T1) acts as a voltage output and can provide a maximum current of IOUT = 11mA. Using external resistors R3 and R4 the Gain GOUT can be adjusted between 2.and 11. 4 4 3 R R R G OUT + = (2) The gain of the entire circuit AM417 is thus: GSYS = GIA GOUT. A current limitation has been integrated into the output stage. The limit circuit restricts output voltage VOUTmin with reference to VCC, where VBE is the basic emitter voltage of external transistor T1. ( ) 1 min 5 . 1 T V V V BE VCC VOUT − = (3) With this the maximum output current can be adjusted using resistor R2 in series with the T1 transistor emitter (see Figure 2). The current is thus calculated as: () 2 2 1 max mV 380 R R T V V I BE THRESH OUT ≈ − = (4) |
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