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NCN49597 Datasheet(PDF) 2 Page - ON Semiconductor |
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NCN49597 Datasheet(HTML) 2 Page - ON Semiconductor |
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2 / 28 page  NCN49597 http://onsemi.com 2 APPLICATION Application Example PC201 11120 .1 TX_OUT NCN49597 TX_ENB ZC_IN REF_OUT RX_IN RX_OUT Appli & Metering mC TXD RXD BR0 BR1 RESB T_REQ 3V3_A 3V3_D 1:2 C1 R1 C2 R2 CDREF C16 C17 3V3_A D5 D1 D2 D3 D4 R12 C11 C12 R14 C15 C14 Y1 NCS5650 C3 C4 C6 C7 R6 R5 R4 R7 R9 R10 2 Vcom +B −B +A −A OutA OutB 8 9 13 12 5 4 3 1 6 7 VCC 10 11 VEE Vuc 19 15 14 20 GNDuC Rlim Vwarn 3V3_D 12V R11 C5 C10 C9 12V R3 MAINS Tr C8 C13 U1 U2 3V3_D VDD1V8 R8 SEN EXT_CLK_E Figure 1. Typical Application for the NCN49597S−FSK Modem Figure 1 shows an S−FSK PLC modem build around NCN49597. For synchronization the line frequency is coupled in via a 1 M W resistor. The Schottky diode pair D5 clamps the voltage within the input range of the zero cross detector. In the receive path a 2nd order high pass filter blocks the mains frequency. The corner point defined by C1, C2, R1 and R2 is designed at 10 kHz. In the transmit path a 3th order low pass filter build around the NCS5650 power operational amplifier suppresses the 2nd and 3rd harmonics to be in line with the CENELEC EN 50065−1 specification. The filter components are tuned for a space and mark frequency of 63.3 and 74 kHz respectively. The output of the amplifier is coupled via a DC blocking capacitor C10 to a 2:1 pulse transformer Tr. The secondary of this transformer is coupled to the mains via a high voltage capacitor C11. High energetic transients from the mains are clamped by the protection diode combination D3, D4 together with D1, D2. Because the mains is not galvanic isolated care needs to be taken when interfacing to a microcontroller or a PC! Table 1. EXTERNAL COMPONENTS LIST AND DESCRIPTION Component Function − Remark Typ Value Tolerance Unit C1, C2 High pass receive filter 1.5 ±10% nF C5, CDREF VREF_OUT ; VREF_OUT decoupling cap − ceramic 1 −20 +80% mF C7, C9, C16, C17 Decoupling block capacitor 100 −20 +80% nF C3 TX_OUT coupling capacitor 470 ±20% nF C4 Low pass transmit filter 470 ±10% pF C6 Low pass transmit filter 68 ±10% pF C8 Low pass transmit filter 3 ±10% pF C10 TX coupling cap; 1 A rms ripple @ 70 kHz 10 ±20% mF |
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