Data Sheet ACPL-C740 Optically Isolated Sigma-Delta Modulator Description Features Superior optical isolation and insulation The Broadcom ACPL-C740 is a 1-bit, second-order sigma- 20-MHz internal clock delta ( - ) modulator that converts an analog input signal 1-bit, second-order sigma-delta modulator into a high-speed data stream with galvanic isolation based 16 bits resolution no missing codes (12 bits ENOB) on optical coupling technology. The ACPL-C740 operates 86 dB SNR from a 5V power supply with dynamic range of 86 dB with 1 V/C maximum offset drift an appropriate digital filter. The differential inputs of 1% gain error 200 mV (full scale 320 mV) are ideal for direct connection to shunt resistors or other low-level signal sources in Internal reference voltage applications, such as motor phase current measurement. 200-mV linear range with single 5V supply (320 mV full scale) The analog input is continuously sampled by a means of 3V to 5.5V wide supply range for digital interface sigma-delta over-sampling using an onboard clock. The 40C to +110C operating temperature range signal information is contained in the modulator data, as a SSO-8 package density of ones with data rate of 20 MHz, and the data are 25-kV/s common-mode transient immunity encoded and transmitted across the isolation boundary Safety and regulatory approval: where they are recovered and decoded into high-speed IEC/EN/DIN EN 60747-5-5: 1414 Vpeak working data stream of digital ones and zeros. The original signal insulation voltage information can be reconstructed with a digital filter. The UL 1577: 5000 V /1 min isolation voltage rms serial interface for data and clock has a wide supply range CSA: Component Acceptance Notice 5 of 3V to 5.5V. 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-C740 Industrial process control provides reliable reinforced insulation and high working Data acquisition systems insulation voltage, which is suitable for fail-safe designs. General-purpose current and voltage sensing This outstanding isolation performance is superior to Traditional current transducer replacements alternatives, including devices based on capacitive- or CAUTION Take normal static precautions in handling and magnetic-coupling with DTI in micro-meter range. Offered in assembly of this component to prevent a Stretched SO-8 (SSO-8) package, the isolated ADC damage, degradation, or both that may be delivers the reliability, small size, superior isolation, and induced by ESD. The components featured in over-temperature performance that motor drive designers this data sheet are not to be used in military or need to accurately measure current at a much lower price aerospace applications or environments. compared to traditional current transducers. Broadcom ACPL-C740-DS103 March 21, 2019ACPL-C740 Data Sheet Optically Isolated Sigma-Delta Modulator Functional Block Diagram Figure 1: Functional Block Diagram V V DD1 DD2 + V 6 - MCLK IN LED MODULATOR/ DECODER DRIVER V ENCODER IN MDAT SHIELD SDM CLK V REF GND1 GND2 Pin Configurations and Descriptions Figure 2: Pin Configuration V V DD1 1 8 DD2 + V 2 7 MCLK IN ACPL-C740 V 3 6 MDAT IN 5 GND1 4 GND2 Table 1: Pin Descriptions Pin No. Symbol Description 1V 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 GND1 Supply ground for signal input side. 5 GND2 Supply ground for data/clock output side (digital side). 6 MDAT Modulator data output. 7 MCLK Modulator clock output. 8V Supply voltage for data output side, relative to GND2. DD2 Broadcom ACPL-C740-DS103 2 BUF