Dual-Channel, High-Speed Digital Isolators Are Said To Improve System Performance

TI's capacitive technology enables magnetic immunity six orders of magnitude higher than existing inductive devices, providing immunity from external magnetic fields that frequently occur in the industrial environment and which can distort signal integrity. In addition, these devices offer high immunity against data corruption due to fast voltage transients (up to 25kV/us).



The capacitive technology also provides galvanic isolation of up to 4000V and life expectancy of greater than 25 years (versus 7-10 years for competitive devices). These are critical requirements in industrial

applications where voltage surges can otherwise degrade device performance and lifetime. Used in combination with isolated power supplies, these devices block high voltages, isolate grounds and prevent noise currents from entering the local ground and interfering with or damaging sensitive circuitry.



To facilitate PCB layout, the ISO7220 has two channels in the same direction and the ISO7221 has two channels in opposite directions. The ISO722x family provides three speed options: 1Mbps, 25Mbps and 150Mbps. Other key specifications include 1ns channel-to-channel skew, 3ns part-to-part skew, 1ns jitter, 1ns pulse width distortion and 4kV ESD protection. All devices support any combination of 3.3V or 5V supplies.



The addition of the ISO7220 and ISO7221 digital isolators complements TI's complete interface solutions ranging from computer and consumer connectivity solutions such as 1394 (FireWireT), USB and PCI Express, to industry serial communications standards such as UART, LVDS, M-LVDS,

RS-485, RS-232, CAN and more.