Low-drift, low-power, series voltage reference | DDC | 5 | -40 to 125

Applications with only a positive

supply voltage often require additional stable voltage in the middle of the

analog-to-digital converter (ADC) input range to bias input bipolar signals. The

REF20xx provides a reference voltage (VREF) for the ADC and a second

highly-accurate voltage (VBIAS) that can be used to bias the input

bipolar signals.

The REF20xx offers excellent

temperature drift (8ppm/°C, maximum) and initial accuracy (0.05%) on both the

VREF and VBIAS outputs while operating at a quiescent

current less than 430µA. In addition, the VREF and VBIAS

outputs track each other with a precision of 6ppm/°C (maximum) across the

temperature range of –40°C to 125°C. All these features increase the precision of

the signal chain and decrease board space, while reducing the cost of the system as

compared to a discrete solution. Extremely low dropout voltage of only 10mV allows

operation from very low input voltages, which can be very useful in battery-operated

systems.

Both the VREF and

VBIAS voltages have the same excellent specifications and can sink

and source current equally well. Very good long-term stability and low noise levels

make these devices ideally-designed for high-precision industrial applications.