AS5911 Datasheet | ams

Description 3 4 Key Benefits & Features 4 5 Applications 4 Block Diagram 5 Ordering Information 6 Tape & Reel Information 7 Revision Information 9 Legal Information 10 Short Datasheet - PUBLIC DS001049 - v1-00 - 2023-Jan-27 10 │ 2 Document Feedback AS5911 General Description 1 General Description The AS5911 is an ultra-low noise, 256-channel low power current to digital converter that enables the readout of photodiodes of a CT detector with highest sensitivity. The output currents of 256 photodiodes are converted simultaneously into digital without any dead time resulting in no charge loss on the inputs. The AS5911 bines current-to-voltage integration and A/D conversion for 256channels in one device. The ADC architecture with its low-noise integrators, coarse quantizer, sampleand-hold and fine quantizer guarantee lowest input related noise of maximum 0.29 f C (low noise mode) at an input current range of 0.5 µA. The input current range of the ADC is selectable between 0.5 µA and 1 µA. The AS5911 supports two supply concepts: a single analog and true ground supply, in both modes the photodiodes are zero biased for ultra-low dark current of the photodiode. In true ground mode, the AS5911 operates at ±1.5 V dual analog supply while in single supply mode only a single analog supply of +3.0 V is needed. The device detects automatically the chosen supply concept. No external ponents are required for supply decoupling. To reduce PCB area and simplify the assembly process, decoupling capacitors for supply and reference voltages are integrated in the 14 x 14 mm² FBGA package. The on-chip LDOs, reference voltages and a temperature sensor minimize the external ponent requirements and reduces the bill of...