Lowest drift bandgap voltage reference ever

Linear Tech is claiming a record for its latest voltage reference – the lowest drift bandgap ever – at 1.5ppm/°C, or 30ppm long-term.

Called the LT6657, low frequency (0.1-10Hz) noise is also good at 0.5ppm_p-p, as is 35ppm of thermal hysteresis.

Wired as a low-drop series reference is needs a supply of as little as 50mV over its 2.5V output to function, and will work up to 40V. Consumption is 1.2mA, or 4µAin shut-down.

Sink mode

Flexible connections allow it to work in both series and shunt mode. (see diagrams).

“Competitive 1.5ppm/°C references are not low drop-out, they are buried Zener and require a supply voltage over 6V,” said the firm.

Standard series mode

The buffered output can source or sink 10mA, dropping around -150mV at -10mA and 450mV at 10mA – with load regulation better than 6ppm/mA and line regulation error under 4ppm/V over the full –40 to 125°C operating range, or 3ppm/mA and 2ppm/V max at 25°C.

Negative voltage shunt

For less demanding applications, a B-grade variant has the same 0.1% initial accuracy, but 3ppm/°C drift“

Protection is included for thermal issues, reverse supply and reversed output. It comes in an 8 lead MSOP.

Positive voltage shunt

Applications are expected in: instrumentation, process control, automated test equipment, industrial, data acquisition, automotive control, battery management and medical equipment.