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ACPL-796J-560E Datasheet(PDF) 10 Page - AVAGO TECHNOLOGIES LIMITED |
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ACPL-796J-560E Datasheet(HTML) 10 Page - AVAGO TECHNOLOGIES LIMITED |
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10 / 16 page  10 Product Overview Description The ACPL-796J isolated sigma-delta ( ¦') modulator converts an analog input signal into a high-speed (up to 20 MHz) single-bit data stream by means of a sigma- delta over-sampling modulator. The time average of the modulator data is directly proportional to the input signal voltage. The modulator uses external clock ranges from 5 MHz to 20 MHz that is coupled across the isolation barrier. This arrangement allows synchronous operation of data acquisition to any digital controller, and adjustable clock for speed requirements of the application. The modulator data are encoded and transmitted across the isolation boundary where they are recovered and decoded into high-speed data stream of digital ones and zeros. The original signal information is represented by the density of ones in the data output. The other main function of the modulator (optocoupler) is to provide galvanic isolation between the analog signal input and the digital data output. It provides high noise margins and excellent immunity against isolation-mode transients that allows direct measurement of low-level signals in highly noisy environments, for example mea- surement of moor phase currents in power inverters. With 0.5 mm minimum DTI, the ACPL-796J provides reliable double protection and high working insulation voltage, which is suitable for fail-safe designs. This outstanding isolation performance is superior to alternatives including devices based on capacitive- or magnetic-coupling with DTI in micro-meter range. Offered in an SO-16 package, the isolated ADC delivers the reliability, small size, superior isolation and over-temperature performance motor drive designers need to accurately measure current at much lower price compared to traditional current transducers. Analog Input The differential analog inputs of the ACPL-796J are im- plemented with a fully-differential, switched-capacitor circuit. The ACPL-796J accepts signal of ±200 mV (full scale ±320 mV), which is ideal for direct connection to shunt based current sensing or other low-level signal sources applications such as motor phase current measurement. An internal voltage reference determines the full-scale analog input range of the modulator (±320 mV); an input range of ±200 mV is recommended to achieve optimal performance. Users are able to use higher input range, for example ±250 mV, as long as within full-scale range, for purpose of over-current or overload detection. Figure 13 shows the simplified equivalent circuit of the analog input. Figure 13. Analog input equivalent circuit. In the typical application circuit (Figure 18), the ACPL-796J is connected in a single-ended input mode. Given the fully differential input structure, a differential input con- nection method (balanced input mode as shown in Figure 14) is recommended to achieve better performance. The input currents created by the switching actions on both of the pins are balanced on the filter resistors and cancelled out each other. Any noise induced on one pin will be coupled to the other pin by the capacitor C and creates only common mode noise which is rejected by the device. Typical value for Ra and Rb is 22 : and 10 nF for C. Figure 14. Simplified differential input connection diagram. 200 : (TYP) 3 pF (TYP) 3 pF (TYP) fSWITCH = MCLKIN VIN+ VIN– 200 : (TYP) 1.5 pF 1.5 pF COMMON MODE VOLTAGE fSWITCH = MCLKIN ANALOG GROUND VIN+ VIN– ACPL-796J VDD1 GND1 5 V +Analog Input – Ra Rb C –Analog Input |
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