New Optically Isolated Sigma-Delta Modulator Eliminates 75% of Shunt Resistor’s Power Losses
Broadcom Limited announced a new optically isolated sigma-delta modulator device, the Avago ACPL-C799, designed for a wide range of industrial applications including servo drives and motors. The new device features a low differential input range of ±50 mV allowing designers to reduce power dissipation across a current-sensing shunt resistor in servo drive and motor applications.
Compared to previous generation products with an input range of ±200 mV, the ACPL-C799 enables the use of a smaller shunt resistor with one-quarter the value, thereby eliminating 75 percent (75%) of shunt resistor’s power losses. Despite the reduced input voltage range, the device delivers superb SNR, ENOB and offset drift performance, enabling a high precision motor control in space constrained, high temperature environments.
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| The ACPL-C799 Functional Block Diagram. |
Product Highlights
- ±50 mV linear input range
- Low power dissipation across shunt resistor
- Extended range of current measurements
- High performance 1-bit, 2nd order sigma-delta modulator
- 77 dB SNR typical
- 16-bit resolution with no missing codes (12-bit ENOB)
- 1.3 µV/°C maximum offset drift over temperature
- 10 MHz internal clock
- Robust optical isolation and insulation
- 25 kV/µs minimum common mode transient immunity (CMTI)
- Wide creepage and clearance of 8.3 mm meeting stringent system level safety regulation
- High reinforced insulation voltage of VIORM = 1414 VPEAK for reliable fail-safe protection in high voltage applications
- Safety approvals from CSA, UL and IEC enabling fast system level safety clearance and time to market.
- Compact stretched SO-8 package
- Operating temperature from –40 °C to +105 °C
Availability
Samples and production quantities of the ACPL-C799 are now available through the Broadcom direct sales channel and via worldwide distribution partners. Please contact your local Broadcom sales representative for pricing.
