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Aerospace

Voltage Reference Has Independent Output Buffers

07 November 2016

LT6658 precision voltage reference. Source: Linear Technology    LT6658 precision voltage reference. Source: Linear Technology
Linear Technology has announced the LT6658, a precision voltage reference that incorporates two high-current output buffers. Based on a 2.5 V bandgap voltage reference, each output can be separately configured for any voltage between 2.5 V and 6 V. Both outputs offer 0.05% initial accuracy, 10 ppm/°C temperature drift and only 1.5 ppm of low-frequency noise. The outputs can drive up to 50 mA and 150 mA, respectively, and sink up to 20 mA. Typical load regulation is only 0.1 ppm/mA with up to 150 mA of load current. In parallel, the buffer outputs can be combined for even higher current capability.

The LT6658 is ideal for driving the reference input for a high-resolution ADC or DAC using one output, while simultaneously supplying power to other devices using the second output. Both outputs track each other over temperature and load, allowing them to address applications requiring ratiometric supply rails. The outputs have good supply rejection and are stable with up to 50 μF over the entire specified operating range. With this output capability, the LT6658 can serve as both reference and regulator combined. Alternatively the LT6658 can be used to generate a reference plus a virtual ground, or as two matched, tracking references.

The LT6658 is currently available in a 2.5 V version. Options for 1.2 V, 1.8 V, 3 V, 3.3 V and 5 V will be available in the first half of 2017. Prices start at $2.35 each in 1,000-piece quantities.



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