AMIS-49200-XTD ON Semiconductor, AMIS-49200-XTD Datasheet

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... AMIS-492x0 Fieldbus MAU (media access unit transceiver chip for low speed FOUNDATION Fieldbus® and Profibus® PA devices. The AMIS-49200 was originally designed near pin-for-pin replacement of the Yokogawa μSAA22Q MAU. “Near pin- for-pin” means that associated component values may change, but no board changes are required. A micro-leadframe package option (NQFP) is also available, the AMIS-49250 ...

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... AMIS-492x0 2.0 AMIS-492x0 Fieldbus MAU Description 2.1 Features AMIS-492x0 Fieldbus MAU is a transceiver IC for low speed FOUNDATION Fieldbus and Profibus PA devices. It incorporates the following features: • All node power can be supplied by the bus, via the AMIS-492x0 • Current consumption 500uA (typ) • ...

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... Bias Circuitry VDD VCC VO Series Low Voltage Regulator SRSET Detectors VSS SRSETIN N_PFail1 SRTR SRAO N_PFail2 Figure 1: AMIS-492x0 Fieldbus MAU Block Diagram Rev Page www.onsemi.com 31 30 FLTOUT FLT HPF 28 SIGIN Bandpass Filter 27 LPF 29 VDRV Tri-Level Modulator 21 & CRT 19 Slew Control VSS ...

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... AMIS-492x0 2.3 Package Information The IC is packaged as shown below. Figure 2: AMIS-49200 Package Dimensions (44-pin LQFP) Rev Page www.onsemi.com ...

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... AMIS-492x0 Figure 3: AMIS-49250 Package Dimensions (44-pin NQFP) Rev Page www.onsemi.com ...

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... AMIS-492x0 Table 1: Pin Numbers and Signal Description Signal Name Pin No. I/O (Note 1) VSS 1 Ground VREF 2 AO VMID 3 AO N_PFAIL1 4 AI/O N_PFAIL2 5 AI/O SHSETIN 6 AI SHSET 7 AO SHUNT 8 AI VSS/ 9 Ground SGND VSS 10 Ground VSS 11 Ground SRSETIN 12 AI SRSET 13 AO SRAO 14 AO ...

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... AMIS-492x0 Table 1: Pin Numbers and Signal Description (Continued) Signal Name Pin No. I/O(Note 1) RXA 34 DO RXS 35 DO TXE 36 DIS TXS 37 DIS POL 38 DIS VSS 39 Ground VSS 40 Ground VSS 41 Ground VSS 42 Ground VSS 43 Ground VCC 44 Analog supply Note Analog Input Analog Output, AI/O = Analog Input/Output, DIS = CMOS Digital Input (Schmitt Trigger CMOS Digital Output ...

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... AMIS-492x0 Table 4: CMOS Input Specifications Parameter Input high voltage Input low voltage Input high current Input low current Schmitt negative threshold Schmitt positive threshold Schmitt hysteresis 3.2 Power Supply Blocks Table 5: Regulator Specifications Parameter Shunt Regulator Output voltage Sink current Load capacitance ...

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... AMIS-492x0 3.3 Transmitter Blocks Table 7: MDS-MAU Interface Parameter MDS-MAU Interface POL input pin TxE input pin TxS input pin Note: The associated MDS chip must handle the jabber detect function. Table 8: Tri-level Modulator Parameter Symbol Tri-level Modulator and Slew Control Output voltage ...

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... Note: 1. The band pass filter is made two pole high pass filter in series with a two pole low pass filter. The filter consists of four resistors internal to AMIS-492x0, and four external capacitors. The active part of each filter is an amplifier connected in a follower configuration. Min. ...

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... IEC/ISA standards. The AMIS-492x0 Fieldbus MAU has a built-in band pass filter which makes it easy to design your own receiver. The receive block operates on a Manchester-encoded signal. It decodes the signal and verifies proper amplitude with a zero-cross and carrier detect circuit, respectively ...

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... AMIS-492x0 The SHUNT pin is normally connected to V Its value should be small enough to keep V than 100Ω.). Since the internal transistor can sink as much as 25mA, no additional circuit is necessary in most cases. Note that the drain current must not exceed 25mA because no protection is implemented for the internal transistor. If you do not need the shunt regulator, you should connect SHUNT and SHSETIN pins to GND and open SHSET pin ...

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... The voltage reference circuitry generates two voltage signals, VREF and VMID. VREF comes from a bandgap circuit and is used as the reference voltage for all circuits in the AMIS-492x0 Fieldbus MAU. The typical value for VREF is 1.185V. See Figure 7. An operational amplifier is regulating VMID to provide a bias (common) level for the AC signals. Its typical voltage is 2V. A capacitor larger than 0.01μ ...

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... AMIS-492x0 4.3 Transmit Block The transmit block contains four sub-blocks: 1. MDS-interface – decodes input signals to generate internal control signals. 2. Tri-level modulator – generates current signals used as inputs to the slew-rate controller. 3. Slew rate controller – converts current to three distinct VDRV voltage levels (V 4. Current drive amplifier – ...

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... AMIS-492x0 N_VL N_Vs 4.3.3. Slew Rate Controller Amplifier (A3), shown in the above figure, controls the slew rate. The amplifier converts the current signals from the tri-level modulator to a voltage signal, VDRV. It controls its slew rate with a capacitor (C symmetric and the fall/rise times are determined by the following equation: The constant part comes from the internal capacitor (not shown) ...

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... AMIS-492x0 4.4 Receive Block The receive block contains three sub-blocks, which are internally connected band pass filter – to filter the desired incoming communication signal. 2. Carrier detector – generates the RxA signal by detecting the signal amplitude. 3. Zero-cross detector generates the RxS signal by detecting the high/low transitions of the Manchester code. ...

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... AMIS-492x0 31 To Detectors 4.4.2. Receive Signal Detection The carrier detector generates the receive activity (RxA) signal by detecting the input signal amplitude. Minimum amplitude is 100mVp- p (TYP). A delay, determined by the capacitor connected between the CCD pin and GND, is added to avoid detection of transient noise. The recommended value of C The zero-cross detector generates the receive signal (RxS) with minimum phase error (jitter) by detecting the transition between high and low levels of the incoming Manchester code ...

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... As can be seen in Table 12, MDS_CTRL is only connected to ground if POL is connected to VDD. See Table 1 for a detailed description of the interaction between MDS_CTRL and POL. In Table 12, the μSAA22Q recommends that the JAB/ signal (Pin 39) be connected to ground if the signal is not used. On AMIS-492x0, Pin 39 must be connected to ground. ...

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... C3 and C4 are part of the receive filter and determine the band pass characteristics of the receive filter unlikely that these would need to be changed noise filter for VMID important that VMID have as little noise as possible used as a reference for many sub-circuits in the AMIS-492x0. C8 must be a large capacitor with maximum of 100nf. C8 recommended value is 1μf. ...

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... Transistors Q1 – Q4 are ordinary small signal transistors. Diodes D1 and D2 are similarly ordinary small signal diodes. Users desiring to replace a μ SAA22Q with the AMIS-49200 in an existing design should be able to use whatever transistors and diodes were used with the μ SAA22Q. For new designs, the specified transistors can be used or other devices may be chosen. ...

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... AMIS-492x0 6.0 Ordering Information Part Number Package AMIS-49200-XTD 44 LQFP 10x10mm (Green/RoHS Compliant) AMIS-49200-XTP 44 LQFP 10x10mm (Green/RoHS Compliant) AMIS-49250-XTD 44 NQFP 7x7mm (Green/RoHS Compliant) AMIS-49250-XTP 44 NQFP 7x7mm (Green/RoHS Compliant) 7.0 Appendix (A) – Manchester Encoding All Fieldbus devices transmit the data onto the media as a Manchester-encoded baseband signal. With Manchester encoding, zeros and ones are represented by transitions that occur in the middle of the bit period (see below). For FOUNDATION Fieldbus H1 and Profibus PA, the nominal bit time is 32 μ ...

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... April 2006 Initial release 2 October 2006 3 January 2007 4 February 2008 Update to new AMIS template 5 May 2008 Update to new ON Semiconductor template; update OPN table 6 June 2008 Added AMIS-49250 ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “ ...