ACPL-C799 Optically Isolated 50 mV Sigma-Delta Modulator Data Sheet Description Features The Avago Technologies ACPL-C799 is a 1-bit, second-order 10-MHz internal clock sigma-delta (- ) modulator converts an analog input signal 1-bit, second-order sigma-delta modulator into a high-speed data stream with galvanic isolation based on 16 bits resolution no missing codes (12 bits ENOB) optical coupling technology. The ACPL-C799 operates from a 77 dB SNR typ 5V power supply with dynamic range of 77 dB with an 1.3 V/C maximum offset drift appropriate digital filter. The differential inputs of 50 mV (full 1% gain error scale 80 mV) are ideal for direct connection to shunt resistors or other low-level signal sources in applications, such as motor Internal reference voltage phase current measurement. 50 mV linear range with single 5 V supply (80 mV full scale) 3V to 5.5V wide supply range for digital interface The analog input is continuously sampled by a means of sigma-delta over-sampling using an on-board clock. The signal 40C to +105C operating temperature range information is contained in the modulator data, as a density of SSO-8 package ones with data rate of 10 MHz, and the data are encoded and 25 kV/s common-mode transient immunity transmitted across the isolation boundary where they are Safety and regulatory approval: recovered and decoded into high-speed data stream of digital IEC/EN/DIN EN 60747-5-5: 1414 Vpeak working ones and zeros. The original signal information can be insulation voltage reconstructed with a digital filter. The serial interface for data UL 1577: 5000 Vrms/1 min isolation voltage and clock has a wide supply range of 3V to 5.5V. CSA: Component Acceptance Notice 5 Combined with superior optical coupling technology, the modulator delivers high noise margins and excellent immunity against isolation-mode transients. With 0.5 mm minimum Applications distance through insulation (DTI), the ACPL-C799 provides Motor phase and rail current sensing reliable reinforced insulation and high working insulation Power inverter current sensing voltage, which is suitable for fail-safe designs. This outstanding isolation performance is superior to alternatives including Industrial process control devices based on capacitive- or magnetic-coupling with DTI in Data acquisition systems micro-meter range. Offered in a Stretched SO-8 (SSO-8) General purpose current sensing package, the isolated ADC delivers the reliability, small size, Traditional current transducer replacements superior isolation and over-temperature performance motor drive designers need to accurately measure current at much CAUTION It is advised that normal static precautions be lower price compared to traditional current transducers. taken in handling and assembly of this component to prevent damage and/or degradation that may be induced by ESD. The components featured in this data sheet are not to be used in military or aerospace applications or environments. Broadcom - 1 -ACPL-C799 Functional Block Diagram Data Sheet Functional Block Diagram Figure 1 Functional Block Diagram V V DD1 DD2 BUF V IN+ MCLK - LED G DECODER MODULATOR/ DRIVER ENCODER MDAT BUF V IN- SHIELD V BUF CLK REF GND1 GND2 Pin Configurations and Descriptions Figure 2 Pin Configuration V V 1 8 DD1 DD2 V + MCLK 2 7 IN ACPL-C799 V 3 6 MDAT IN GND1 GND2 4 5 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 50 mV IN+ Negative analog input, recommended input range 50 mV (normally connected to GND1) 3V 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 - 2 -