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CS5451A датащи(PDF) 8 Page - Cirrus Logic |
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CS5451A датащи(HTML) 8 Page - Cirrus Logic |
8 / 13 page CS5451A 8 DS635F2 3. THEORY OF OPERATION The CS5451A is a six-channel analog-to-digital convert- er (ADC) followed by a serial interface that allows com- munication with a target device. The analog inputs are structured for 3-phase power meter applications, with three dedicated voltage and current channels. Figure 2 illustrates the CS5451A typical inputs and power supply connections. The voltage-sensing element introduces a voltage waveform on the voltage channel inputs VIN(1-3) ± and is subject to a fixed 1x gain amplifier. A fourth-order del- ta-sigma modulator samples the amplified signal for dig- itization. Simultaneously, the current-sensing element introduces a voltage waveform on the current channel input IIN(1-3) ± and is subject to two selectable gains of the programmable gain amplifier (PGA). The amplified sig- nal is sampled by a fourth-order delta-sigma modulator for digitization. Both converters sample at a rate of XIN/8, the over-sampling provides a wide dynamic range and simplified anti-alias filter design. The decimating digital filters on all channels are Sinc3 filters. The single bit data is passed to the low-pass dec- imation filter and output at a fixed word rate. The deci- mation rate is selectable for two output word rates. The 16-bit output word is then transmitted via a master serial data port. The six-channel data is multiplexed on the serial data output and is preceded by a frame sync signal. VA+ VD+ VIN1+, VIN2+, or VIN3+ VIN1-, VIN2-, or VIN3- IIN1+, IIN2+, or IIN3+ IIN1-, IIN2-, or IIN3- AGND DGND REFIN REFOUT Optional External Reference V PHASE + I -2 V PHASE VA- +3 V 1.2 V NOTE: Current input channels actually measure voltage. Figure 2. Typical Connection Diagram |
Аналогичный номер детали - CS5451A_05 |
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Аналогичное описание - CS5451A_05 |
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