ACPL-C797T Automotive Optically Isolated Sigma-Delta Modulator Data Sheet Description Features Qualified to AEC-Q100 Grade 1 Test Guidelines The ACPL-C797T is a 1-bit, second-order sigma-delta ( -) modulator that converts an analog input signal into a Automotive temperature range: -40 C to +125 C high-speed data stream with galvanic isolation based on 1-bit, second-order sigma-delta modulator optical coupling technology. The ACPL-C797T operates 10 MHz internal clock from a 5 V power supply with dynamic range of 79 dB with 16-bit resolution no missing codes (12 bits ENOB) an appropriate digital filter. The differential inputs of 200 mV (full scale 320 mV) are ideal for direct connection to Signal-to-Noise Ratio: 79 dB Typ. shunt resistors or other low-level signal sources in applica- Gain error: 1% tions such as motor phase current measurement. 200 mV linear range with single 5 V supply (320 mV The ACPL-C797T isolated modulator converts a low- full scale) bandwidth analog input into a high-speed one-bit data Wide supply range for digital interface: 3 V to 5.5 V stream by means of a Sigma-Delta ( -) over-sampling modulator. The modulator data and on-chip sampling Compact, surface mount SSO-8 package clock are encoded and transmitted across the isolation Superior optical isolation and insulation boundary where they are recovered and decoded into Common-mode transient immunity: 25 kV/s separate high-speed clock and data channels. Combined Safety and regulatory approval: with superior optical coupling technology, the modulator IEC/EN/DIN EN 60747-5-5: 1414 V working insu- delivers high noise margins and excellent immunity PEAK lation voltage against isolation-mode transients. UL 1577: 5000 V /1 minute isolation voltage RMS Oerff ed in a a compact SSO-8 package, the isolated CSA: Component Acceptance Notice 5 ADC delivers the reliability, small size, superior isolation and over-temperature performance that motor drive Applications designers need to accurately measure current. Avago 2 TM Automotive electric motor phase and rail current R Coupler isolation products provide the reinforced in- sensing sulation and reliability needed for critical automotive and high-temperature industrial applications. Automotive inverter DC bus current sensing Automotive battery current sensing Functional Block Diagram Automotive DC-DC converter current sensing V V 1 8 DD2 DD1 Automotive AC-DC Charger current sensing General-purpose current and voltage sensing LED VIN+ 2 7 MCLK DRIVER MDAT V BUF V 3 REF 6 IN- CLOCK GND2 GND1 4 5 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. SIGMA-DELTA MODULATOR/ ENCODER DECODERPin Configuration and Description Pin description Pin No. Symbol Description V V 1 DD1 DD2 8 1 V Supply voltage for signal input side (analog side), relative to DD1 GND1 2 MCLK 7 VIN+ 2 V Positive analog input, recommended input range 200 mV IN+ MDAT 3 V 6 IN- 3 V Negative analog input, recommended input range 200 mV IN (normally connected to GND1) 4 5 GND1 GND2 4 GND1 Supply ground for signal input side Figure 2. Pin configuration 5 GND2 Supply ground for data/clock output side (digital side) 6 MDAT Modulator data output 7 MCLK Modulator clock output 8 V Supply voltage for data output side, relative to GND2 DD2 Ordering Information Option UL 5000 V /1 Minute IEC/EN/DIN EN RMS Part number (RoHS Compliant) Package Surface Mount Tape & Reel rating 60747-5-5 Quantity ACPL-C797T -000E Stretched X X X 80 per tube SO-8 -500E X X X X 1000 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-C797T-500E to order product of Surface Mount package in Tape and Reel packaging with RoHS compliance. Option datasheets are available. Contact your Avago sales representative or authorized distributor for information. 2