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ADE9078 数据表(PDF) 67 Page - Analog Devices |
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ADE9078 数据表(HTML) 67 Page - Analog Devices |
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67 / 108 page  ADE9078 Data Sheet Rev. 0 | Page 66 of 107 WAVEFORM BUFFER The ADE9078 has a waveform buffer comprised of 2048, 32-bit memory locations with addresses from Address 0x800 to Address 0xFFF. This memory can be filled with samples from the sinc4 or sinc4 + IIR LPF or current and voltage waveform samples processed by the digital signal processor. Resampled waveforms make it easy to perform harmonic analysis in an external processor that can use the 16-bit, 64 points per line cycle samples directly in a FFT, without having to perform any windowing functions. The data in the waveform buffer can come from four locations in the signal chain, as follows: Sinc4 outputs, xI_SINC_DAT, xV_SINC_DAT: 16 kSPS Sinc4 + IIR LPF output, xI_LPF_DAT, xV_LPF_DAT: 4 kSPS Current and voltage channel waveforms processed by the DSP (xI_PCF, xV_PCF): 4 kSPS Resampled waveforms with 64 points per line cycle processed by the DSP: data rate varies with line period Figure 104 and Figure 105 show the current and voltage channel datapaths, indicating which waveforms can be stored into the waveform buffer. Filling and accessing of the waveform buffer depends on which type of data is being filled in the buffer. The waveforms with a fixed data rate, 16 kSPS or 4 kSPS, are referred to as fixed data rate waveforms. The following sections explain what modes/access are available for resampled waveforms versus fixed data rate waveforms. The waveform buffer samples can be accessed using the SPI burst read functionality so that multiple samples can be read using only one SPI command header (see the Burst Read Waveform Buffer Samples from SPI section). xIGAIN HPF CURRENT PEAK DETECTION REFERENCE Σ-∆ MODULATOR IP VIN VIN +1V ANALOG INPUT RANGE 0V –1V ADE9078 CURRENT CHANNEL (IA, IB, IC) SINC4 LPF 4:1 xIGAINx PHASE COMP WAVEFORM BUFFER INTEGRATOR WF_SRC WF_CAP_SEL MTEN HPFDIS INTEN ICONSEL* IB = –IA – IC xI_PCF RESAMPLING ADC_ REDIRECT MUX NOTE: ICONSEL ONLY AFFECTS IB CHANNE L CALCULATION TOTAL ACTIVE AND REACTIVE POWER CALCULATION ZX_SRC_SEL ZX DETECTION NOT AVAILABLE IN ADE9078 PSM1 TOTAL CURRENT RMS VA POWER CALCULATIONS FUNDAMENTAL REACTIVE POWER CALCULATIONS RESAMPLED WAVEFORM DATA RANGE 0V 0V 0V 0xFBFF_FB90 = –67,110,000 0x0471_15C0 = +74,520,000 0x0474_E650 = +74,770,000 0V CURRENT CHANNEL (xI_PCF) DATA RANGE SINC4 + IIR LPF (xI_LPF_DAT) DATA RANGE SINC4 OUTPUT (xI_SINC_DAT) DATA RANGE 0x0400_0470 = +67,110,000 0x46B4 = +18,100 0xB94C = –18,100 0xFB8B_19B0 = –74,770,000 0xFB8E_EA40 = –74,520,000 4kSPS Figure 104. Current Channel Datapath |
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