The DS1842A integrates the discrete high-voltage components required for avalanche photodiode (APD) bias and monitoring applications. The switching FET and precision voltage-divider network, in conjunction with an external DC-DC controller, form a step-up DC-DC converter. A current clamp function limits the current through the APD, with an external shutdown function. A precision voltage-divider network is provided for precise control of the APD bias voltage. The device also features dual current mirrors for monitoring the APD current.
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