ACPL-796J Optically Isolated Sigma-Delta Modulator Data Sheet Description Features The ACPL-796J is a 1-bit, second-order sigma-delta ( ) 5 MHz to 20 MHz external clock input range modulator converts an analog input signal into a high- 1-bit, second-order sigma-delta modulator speed data stream with galvanic isolation based on optical 16 bits resolution no missing codes (12 bits ENOB) coupling technology. The ACPL-796J operates from a 5 V 74 dB minimum SNR power supply with dynamic range of 80 dB with an appro- 3.5 V/C maximum off set drift priate digital fi lter. The diff erential inputs of 200 mV (full scale 320 mV) are ideal for direct connection to shunt 1% maximum gain error resistors or other low-level signal sources in applications Internal reference voltage such as motor phase current measurement. 200 mV linear range with single 5 V supply The analog input is continuously sampled by means of 3 V to 5.5 V wide supply range for digital interface sigma-delta over-sampling using external clock, coupled 40C to +105C operating temperature range across the isolation barrier, which allows synchronous SO-16 package operation with any digital controller. The signal infor- 25 kV/s common-mode transient immunity mation is contained in the modulator data, as a density of ones with data rate up to 20 MHz, and the data are Safety and regulatory approval: encoded and transmitted across the isolation boundary IEC/EN/DIN EN 60747-5-5: 1414 Vpeak working where they are recovered and decoded into high-speed insulation voltage data stream of digital ones and zeros. The original signal UL 1577: 5000 Vrms/1min double protection rating information can be reconstructed with a digital fi lter. The CSA: Component Acceptance Notice 5 serial interface has a wide supply range of 3 V to 5.5 V. Applications Combined with superior optical coupling technology, the modulator delivers high noise margins and excellent Motor phase and rail current sensing immunity against isolation-mode transients. With 0.5 mm Power inverter current and voltage sensing minimum distance through insulation (DTI), the ACPL-796J Industrial process control provides reliable double protection and high working insulation voltage, which is suitable for fail-safe designs. Data acquisition systems This outstanding isolation performance is superior to General purpose current and voltage sensing alternatives including devices based on capacitive- or Traditional current transducer replacements magnetic-coupling with DTI in micro-meter range. Off ered in an SO-16 package, the isolated ADC delivers the reli- Functional Block Diagram ability, small size, superior isolation and over-temperature performance motor drive designers need to accurately V DD1 V DD2 measure current at much lower price compared to tradi- tional current transducers. LED V + IN DECODER MDAT MODULATOR/ DRIVER The internal clock version modulators, HCPL-7860 (DIP-8/ V ENCODER IN gull wing surface mount package) and HCPL-786J (SO-16 SHIELD package), are also available. LED CLOCK MCLKIN DRIVER DETECTOR V REF SHIELD ACPL-796J GND1 GND2 Figure 1. CAUTION: It is advised that normal static precautions be taken in handling and assembly of this component to prevent damage and/or degradation which may be induced by ESD. The components featured in this datasheet are not to be used in military or aerospace applications or environments. BUFPin Confi guration and Descriptions ACPL-796J V 1 16 GND2 DD1 V + 2 15 NC IN V 3 14 V IN DD2 GND1 4 13 MCLKIN NC 12 NC 5 NC 6 11 MDAT V 7 10 NC DD1 GND1 8 9 GND2 Figure 2. Pin confi guration. Table 1. Pin descriptions. Pin No. Symbol Description 1, 7 V Supply voltage for signal input side (analog side), relative to GND1 DD1 2V + Positive analog input, recommended input range 200 mV IN 3V Negative analog input, recommended input range 200 mV (normally connected to GND1) IN 4, 8 GND1 Supply ground for signal input side 5, 6, 10, 12, 15 NC No connection. Leave fl oating 9, 16 GND2 Supply ground for data output side (digital side) 11 MDAT Modulator data output 13 MCLKIN Modulator clock input, 5 MHz to 20 MHz 14 V Supply voltage for data output side, relative to GND2 DD2 Table 2. Ordering Information ACPL-796J is UL recognized with 5000 Vrms/1 minute rating per UL 1577. Option IEC/EN/DIN EN Part number (RoHS Compliant) Package Surface Mount Tape& Reel 60747-5-5 Quantity -000E X 45 per tube -060E X X 45 per tube ACPL-796J SO-16 -500E X X 850 per reel -560E X X X 850 per reel To order, choose a part number from the part number column and combine with the desired option from the option column to form an order entry. Example: ACPL-796J-560E to order product of Surface Mount package in Tape and Reel packaging with IEC/EN/DIN EN 60747-5-5 Safety Approval and RoHS compliance. Option datasheets are available. Contact your Avago sales representative or authorized distributor for information. 2