The REF6000 family of voltage references have an integrated low
output impedance buffer that enable the user to directly drive the REF pin of precision data
converters, while preserving linearity, distortion, and noise performance. Most precision SAR and
Delta-Sigma ADCs, switch binary-weighted capacitors onto the REF pin during the conversion process.
In order to support this dynamic load the output of the voltage reference must be buffered with a
low-output impedance (high-bandwidth) buffer. The REF6000 family devices are well suited, but not
limited, to drive the REF pin of the
family of SAR ADCs, and
family of delta-sigma ADCs, as well as other digital-to-analog converters (DACs).
The REF6000 family of voltage references are able to maintain
an output voltage within 1LSB (18-bit) with minimal droop, even during the first conversion while
driving the REF pin of the ADS8881. This feature is useful in burst-mode, event-triggered,
equivalent-time sampling, and variable-sampling-rate data-acquisition systems. The
REF60xx variants of REF6000 family
specify a maximum temperature drift of just 5 ppm/°C and initial accuracy of 0.05% for both the voltage reference and the low output
impedance buffer combined. For various temperature drift options in REF6000 family, see the
Device Comparison Table.
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