Utilizing the company’s innovative capacitive isolation technology, Texas Instruments Incorporated (TI) (NYSE: TXN) introduced a new family of dual-channel digital isolators, featuring faster data transmission, higher magnetic immunity and longer life expectancy than competitive devices. The ISO7220 and ISO7221 improve system performance and reduce cost in high-voltage, noisy applications such as factory automation, process control, computer peripherals and data acquisition systems.
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 (FireWire[TM]), USB and PCI Express, to industry serial communications standards such as UART, LVDS, M-LVDS, RS-485, RS-232, CAN and more. Please see the Interface Selection Guide for more information.
The ISO7220 and ISO7221 are available now from TI and its authorized distributors in SOIC-8 packages. Suggested resale pricing for both devices starts at $0.95 in 1,000-unit quantities. An evaluation module is available.
In addition, triple- and quad-channel versions are sampling now with volume production scheduled for 4Q07.