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CS5471 Arkusz danych(PDF) 7 Page - Cirrus Logic |
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CS5471 Arkusz danych(HTML) 7 Page - Cirrus Logic |
7 / 14 page CS5471 7 2. GENERAL DESCRIPTION The CS5471 is designed for single-phase power meter applications and interfaces to a current trans- formers or shunt to measure current, and a resistive divider or transformer to measure voltage. The CS5471 combines two ∆Σ modulators and decimation filters, one channel assigned for current input that has programmable input gain amplifiers, and one channel assigned for voltage input. The CS5471 includes two decimation filters that output data at a 2000 Hz or 4000 Hz output word rate (OWR) when the input frequency at XIN = 4.096 MHz. The device outputs data on a serial output port. 2.1 Theory of Operation The CS5471 is designed to operate from a single +3V supply and provides a ±40 mV and ±800 mV input range for the current channel and ±800 mV range for the voltage channel. These voltages rep- resent the maximum zero-to-peak voltage levels that can be presented to the inputs. The CS5471 is designed to accommodate common mode + signal levels from VA- to VA+. Figure 2 illustrates the CS5471 typical inputs and power supply connec- tions. 2.2 Performing Measurements The converter outputs are transferred in 16-bit signed (two’s complement) data formats as a per- VA+ VD+ VIN + VIN- IIN+ IIN - AGND DGND REFIN REFOUT Optional External Reference V PHASE + I -2 V PHASE VA- +3 V 1.2 V NOTE: Current input channel actually measures voltage. Figure 2. Typical Connection Diagram |
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