ACPL-798J Optically Isolated Sigma-Delta Modulator with LVDS Interface Data Sheet Lead (Pb) Free RoHS 6 fully compliant RoHS 6 fully compliant options available -xxxE denotes a lead-free product Description Features The ACPL-798J is a 1-bit, second-order sigma-delta (-) Up to 25 MHz external clock input range modulator that oversamples an analog input signal into LVDS clock and data interface. a highspeed data stream with galvanic isolation based 1-bit, second-order sigma-delta modulator on optical coupling technology. The ACPL-798J operates 16 bits resolution no missing codes (12 bits ENOB) from a 5 V power supply with dynamic range of 82 dB with 75dB Typical SNDR an appropriate digital filter. The differential inputs of 200 mV (full scale 320 mV) are ideal for direct connection to 3.5mV/C maximum offset drift shunt resistors or other low-level signal sources in applica- 1% maximum gain error tions such as motor phase current measurement. 200 mV linear range with single 5 V supply The analog input is continuously sampled by means of 40C to +105C operating temperature range sigma-delta over-sampling using external clock, coupled SO-16 package across the isolation barrier, which allows synchronous 25 kV/ms common-mode transient immunity operation with any digital controller. The signal infor- Safety and regulatory approval (pending): mation is contained in the modulator data, as a density IEC/EN/DIN EN 60747-5-5: 1414 Vpeak working of ones with data rate up to 25 MHz, and the data are encoded and transmitted across the isolation boundary insulation voltage where they are recovered and decoded into high-speed UL 1577: 5000 Vrms/1min double protection rating data stream of digital ones and zeros. The original signal CSA: Component Acceptance Notice 5 information can be reconstructed with a digital filter. The ACPL-798J comes with an LVDS interface on both clock Applications inputs and data outputs for better signal integrity. Motor phase and rail current sensing Combined with superior optical coupling technology, Power inverter current and voltage sensing the modulator delivers high noise margins and excellent Industrial process control immunity against isolation-mode transients. With 0.5 mm Data acquisition systems minimum distance through insulation (DTI), the ACPL-798J General purpose current and voltage sensing provides reliable double protection and high working in- sulation voltage, which is suitable for fail-safe designs. Traditional current transducer replacement This outstanding isolation performance is superior to al- Functional Block Diagram ternatives including devices based on capacitive or mag- netic-coupling with DTI in micro-meter range. Oerff ed in V V DD1 DD2 an SO-16 package, the isolated ADC delivers the reliability, small size, superior isolation and over-temperature perfor- MDAT+ LED V + IN DECODER DRIVER MODULATOR/ mance motor drive designers need to accurately measure MDAT- V ENCODER IN current at much lower price compared to traditional SHIELD current transducers. MCLKIN+ LED CLOCK DRIVER DETECTOR MCLKIN- V SHIELD REF ACPL-798J GND2 GND1 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. BUFPin Configuration and Descriptions ACPL-798J V 16 GND2 DD1 1 V + 2 15 NC IN V 3 14 V IN DD2 GND1 13 MCLKIN+ 4 NC 5 12 MCLKIN NC 6 11 MDAT+ V 7 10 MDAT DD1 GND1 8 9 GND2 Figure 2. Pin configuration. Table 1. Pin descriptions. Pin No. Symbol Description 1,7 V Supply voltage for input side relative to GND1. DD1 2 V + Positive analog input, recommended input range 200 mV. IN 3 V Negative analog input, recommended input range 200 mV (normally connected to GND1). IN 4,8 GND1 Supply ground for signal input side. 5,6,15 NC No connection. Leave floating. 9, 16 GND2 Supply ground for data output side (digital side). 11 MDAT+ Positive LVDS modulator data output. 10 MDAT- Negative LVDS modulator data output. 13 MCLKIN+ Positive LVDS modulator clock input 12 MCLKIN- Negative LVDS modulator clock input 8 V Supply voltage for output side, referenced to GND2. DD2 Table 2. Ordering Information IEC/EN/DIN Option Part number (RoHS Compliant) Package Tape & Reel EN 60747-5-5 Quantity ACPL-798J -000E SO-16 X 45 per tube -500E 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-798J-500E to order product in Tape and Reel packaging. Contact your Avago sales representative or authorized distributor for information. 2