With 16-bit resolution and SNR of 86 dB, STMicro’s ISOSD61 isolated modulator enhances performance and reliability in industrial motor control. The second-order sigma-delta modulator offers a choice of single-ended (TTL/CMOS) and LVDS interface options. In addition to motor control, the part is well-suited for EV charging stations, solar inverters, factory automation, and server and telecom power supplies.

The ISOSD61’s embedded galvanic isolation eliminates the degradation associated with alternative optocoupled converters. It also lowers power consumption and allows faster data transmission. The sigma-delta modulator converts an analog input signal with an amplitude of up to ±320 mV into a high-speed 1-bit digital data stream at a rate of up to 25 Msamples/s. Isolation voltage is 6 kV peak, while working voltage is 1.2 kV peak. Common-mode transient immunity of 30 kV/μs ensures strong rejection of fast transient noise commonly found in harsh industrial environments.

The ISOSD61 accepts an external clock input up to 25 MHz for easier synchronization. By integrating an ADC and isolated UART peripheral functions into a single chip, the ISOSD61 helps to reduce BOM and increase noise immunity and reliability. The modulator comes in an SO16W plastic package and operates over a temperature range of -40°C to +125°C.

Offered in two variants: the ISOSD61 offers TTL/CMOS-compatible clock-input and data-output signal levels, while the ISOSD61L is compatible with low-voltage differential signaling (LVDS). Prices start at $2.50 each in lots of 1000 units. Evaluation boards are available for both the TTL/CMOS and LVDS variants.

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