Reinforced isolation meets highest industrial performance

12th November 2014
Jacqueline Regnier

Texas Instruments today introduced digital isolation and delta-sigma modulator families that offer reinforced isolation to help protect electronic equipment from high line voltages. The ISO7842 family provides the industry’s highest immunity reinforced isolators and the first to withstand an isolation barrier with a working breakdown voltage of 1,500 Vrms for a minimum lifetime of 40 years. The AMC1304 delta-sigma modulator family offers best-in-class precision performance and the lowest power consumption with reinforced isolation for current shunt monitoring. 

Manufacturers of factory automation, motor control and other industrial equipment are integrating more advanced electronics to reduce power and increase efficiency and system intelligence, driving data rate requirements higher and raising the bar on system performance. TI’s new devices offer robust, high-speed, high-performance reinforced isolation to meet critical functional and safety isolation requirements for applications exposed to potential high voltage breakdowns, while providing decades of reliability with precision analog performance and high immunity for noisy industrial environments.

Key benefits of the ISO7842 family:

  • Superior overall reinforced isolation breakdown ratings: Provides reinforced isolation with 8,000 V maximum transient overvoltage, according to standard DIN V VDE 0884-10. In addition, the ISO7842 has an isolation rating of 5,700 Vrms, according to standard UL 1577, surpassing typical ratings of 5,000 Vrms. (UL Recognized Component and DIN V VDE 0844-10 certifications planned).
  • Long-term reliability: Industry’s highest working voltage at 1,500 Vrms is up to 50 percent higher than competitive solutions.
  • Minimize data transmission errors: High common mode transient immunity (CMTI) performance of 100 kV/microsecond provides reliable communication in noisy environments.
  • Industry-leading protection: With the industry’s highest surge voltage protection rating of 12,800 VPEAK, the ISO7842 can withstand high instantaneous voltage pulses, which can help protect electronics from damage by voltage spikes.
  • High speed and precision timing: The ISO7842 provides accurate timing with more than 100 Mbps data rate and low jitter.

Key benefits of the AMC1304 family:

  • Leading precision performance: The offset error maximum of 150 microvolts and gain error of +/- 0.3 percent is the industry’s best DC performance. With the lowest thermal drift specification, the devices ensure high accuracy over the entire operating temperature range of -40 C to 125 C. Industry-leading AC performance allows motor control designers to minimize distortion and noise.
  • Lowest power: The industry’s lowest power dissipation (maximum 7 mA, primary, and 5 mA, secondary side), together with a 50-mV input voltage range, reduces overall system power consumption by up to 80 percent.
  • Simpler system design: Four AMC1304 delta-sigma modulators are the industry’s first to integrate a low-dropout regulator (LDO), allowing designers to connect the modulator to an unregulated supply voltage. When paired with TI’s C2000™ Delfino™ TMS320F2837x and TMS320F2807x microcontrollers (MCUs) with integrated modulator interfaces and sinc filters, the AMC1304 can boost system performance by precisely and efficiently acquiring multiple analog signals.
  • High-voltage isolation protection: The devices deliver reinforced isolation of 7,000 V, peak, surge voltage of 10,000 V, and working voltages of 1,000 Vrms and 1,500 Vdc. They are UL Recognized Component to UL 1577 and certified to DIN V VDE 0884-10.

Tools and support to jump-start design

TI support, including hardware evaluation kits and reference designs from the TI Designs library, speeds time to market for designers using the ISO7842 and AMC1304 families.

The isolated current shunt and voltage feedback reference design (TIDA-00171) implements the AMC1304 delta-sigma modulator and the C2000™ TMS320F28377D Delfino™ MCU. This design is being demonstrated this week in a motor control application at the electronica 2014 Trade Fair, Hall A4, Booth 420. The isolated LVDS reference design (TIDA-00330) uses a reinforced isolated M-LVDS transceiver node and isolated power supply to enable a robust high-speed serial interface design, utilizing the ISO7842 digital isolator, SN65MLVD203 M-LVDS transceiver, SN6501 transformer driver and TPS76333 single-channel LDO. Two additional reinforced isolation reference designs are available today from TI.

Visit precision data converters or industrial interface forums in the TI E2E™ Community to search for solutions, get help, share knowledge and solve problems with fellow engineers and TI experts.

Package, availability and pricing

The four-channel ISO7842 is the first in a reinforced digital isolator family that will include quad-, triple-, dual- and single-channel devices. The ISO7842 is available today in production quantities and additional devices will be available in 1Q 2015. The AMC1304M25 with integrated LDO and CMOS interface and AMC1305L25 delta-sigma modulators are the first of seven devices, which will support inputs ranging from +/-50 to +/-250 mV. The AMC1304M25 is available for sampling Nov. 18, with production quantities of all devices planned for early 2015.

The devices are offered in a SOIC-16 DW package, and priced in quantities of 1,000 as listed below.

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