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CS5466 датащи(PDF) 10 Page - Cirrus Logic |
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CS5466 датащи(HTML) 10 Page - Cirrus Logic |
10 / 16 page CS5466 10 4. THEORY OF OPERATION The CS5466 is a dual channel Analog-to-Digital Con- verter (ADC) followed by a computation engine that per- forms an energy-to-pulse conversion. The flow diagram for the two data paths is depicted in Figure 2. The ana- log inputs are structured with two dedicated channels, voltage and current, then optimized to simplify interfac- ing to sensing elements. The voltage sensing element introduces a voltage waveform on the voltage channel input VIN ± and is sub- ject to a fixed 10x gain amplifier. A second order delta- sigma modulator samples the amplified signal for digiti- zation. Simultaneously, the current sensing element introduces a voltage waveform on the current channel input IIN ± and is subject to the four selectable gains of the Pro- grammable Gain Amplifier (PGA). The amplified signal is sampled by a fourth order delta-sigma modulator for digitization. Both converters sample at a rate of (MCLK)/8, the over-sampling provides a wide dynamic range and simplified anti-alias filter design. 4.1 Digital Filters The decimating digital filters on both channels are Sinc3 filters followed by 4th-order IIR filters. The single bit data is passed to the low pass decimation filter and output at a fixed word rate. The output word is passed to the IIR filter to compensate for the magnitude roll-off of the low- pass filtering operation. An optional digital High-Pass Filter (HPF in Figure 2) re- moves any dc component from the selected signal path. By removing the dc component from the voltage or cur- rent channel, any dc content will also be removed from the calculated average real power as well. 4.2 Average Real Power Computation The instantaneous voltage and current data samples are multiplied together to obtain the instantaneous pow- er. The product is then averaged over 400 conversions to compute the average real power value used to drive pulse outputs E1, E2 and FOUT. Output pulse rate of E1 and E2 can be set to one of four frequencies to directly drive a stepper motor or a electromechanical counter or interface to a microcontroller or infrared LED. The alter- nating output pulses of E1 and E2 allows for use with low cost electromechanical counters. Output FOUT provides a uniform pulse stream that is proportional to the average real power and is designed for system calibration. The FREQ2:0 inputs set the out- put pulse rate of E1, E2 and FOUT. See Section 5.3 for more details. 2nd Order ∆Σ Modulator 4th Order ∆Σ Modulator x VIN± IIN± Energy-to- Pulse Rate Converter E1 E2 FOUT Sinc3 PGA 10x HPF NEG IGAIN[1:0] HPF FREQ[2:0] IIR IIR Sinc3 N = 400 Σ Ν Current Channel Voltage Channel Digital Filter Digital Filter HPF Figure 2. Data Flow |
Аналогичный номер детали - CS5466 |
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Аналогичное описание - CS5466 |
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