What the ADUM5211BRSZ brings to the BOM
The ADUM5211BRSZ is a 2-channel, unidirectional digital isolator from Analog Devices' IsoPower and iCoupler families. This makes it a space- and BOM-efficient choice for designs that need both signal isolation and a small amount of isolated power for a sensor, ADC, or transceiver on the secondary side.
The 25 Mbps data rate places this part in the mid-speed tier of the ADUM5211 family. It handles SPI at 20 MHz, UART at standard baud rates, and most industrial fieldbus interfaces (RS-485, CAN at 1 Mbps, Profibus up to 12 Mbps) with margin. The 35 ns max propagation delay and 3 ns max pulse-width distortion keep timing jitter low enough for clocked serial links. If your application needs 100 Mbps throughput — for example, a high-speed ADC data stream or a parallel bus — the ADUM5211CRSZ is the faster sibling at 100 Mbps, with a tighter 24 ns propagation delay. The trade-off is a slightly higher supply current at speed; the 25 Mbps variant draws less quiescent power when the bus is idle.
Isolated power: what the integrated converter covers
The integrated isoPower DC-DC converter provides up to 50 mW of isolated output power — enough to bias a small op-amp, a single RS-485 transceiver, or a low-power sensor. The output is not regulated to a tight tolerance; expect ripple in the tens of millivolts at light load. For noise-sensitive analog circuits, a post-regulator LDO on the isolated rail is recommended. The 2500 Vrms isolation rating is basic isolation per UL 1577, suitable for industrial equipment, medical non-patient-contact, and general-purpose galvanic isolation. The common-mode transient immunity of 25 kV/µs ensures the data path stays clean during fast switching events on the primary side, such as a motor-drive PWM edge.
ROHS3 compliant. For dual-sourcing flexibility, the ADUM5211CRSZ is a pin-compatible 100 Mbps variant in the same package — a drop-in replacement if the design can tolerate the higher data rate and slightly higher supply current.