ISO113

Overview

The ISO113 is a low-cost, high-voltage output isolation amplifier providing both signal and isolated power in a double-wide DIP package. It features a transformer-coupled DC/DC converter and capacitor-coupled signal channel. Key electrical parameters include a continuous AC barrier rating of 1500Vrms, a small-signal bandwidth of 20kHz, and an initial gain error of ±0.3%. The device operates with input supplies of ±10V to ±18V and provides an isolated output supply of ±14.25V to ±15.75V at up to ±50mA. It supports multichannel synchronization via a TTL clock.

Feature Summary

• Self-contained design delivering both signal transmission and isolated output power across the barrier
• Built-in transformer-coupled DC/DC converter generating regulated isolated supply for external loads
• Capacitor-coupled signal channel ensuring galvanic isolation with low leakage current
• Multichannel synchronization capability using an external TTL clock signal

Applications

• 4mA to 20mA V/I converters
• Motor and valve controllers
• Isolated recorder outputs
• Medical instrumentation outputs
• Gas analyzers

Procurement Notes

Verify component status as NRND (Not Recommended for New Designs). Confirm package type is CDIP SB JVB with 16 pins. Ensure design accounts for the specific operating temperature range of -25°C to +85°C. Check for UL1244 compliance requirements if isolation certification is needed for the final system.

Selection Notes

Select this component when simultaneous signal isolation and isolated power delivery are required in a compact form factor. Consider the 20kHz bandwidth limit for high-speed applications. Evaluate the need for multichannel synchronization if multiple units are used in parallel. Verify that the ±50mA isolated output current meets load requirements without excessive ripple filtering.

Part Context

Manufactured by Texas Instruments (formerly Burr-Brown), the ISO113 belongs to the family of internally powered output isolation amplifiers. It utilizes a ceramic non-hermetic hybrid package with side-brazed pins. The device integrates a proprietary 800kHz oscillator and square core wirebonded transformer for efficient power transfer across the isolation barrier.

Replacement Considerations

ISO103: Low-cost, internally powered isolation amplifier but lacks high-voltage output power capabilities.

FAQ

How is multichannel synchronization achieved?

Multiple ISO113 units can be synchronized by connecting their Sync pins (Pin 3) to an external TTL-level oscillator operating between 1.2MHz and 2MHz.

What is the maximum continuous isolation voltage?

The ISO113 has a rated continuous isolation voltage of 1500Vrms at 60Hz and 2121VDC.