AS5911 AMSCO | Alldatasheet
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Technical content
256-Channel Low Noise Current-to-Digital Converter v1-00 • 2023-Jan-27
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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 combines current-to-voltage integration and A/D conversion for 256- channels in one device. The ADC architecture with its low-noise integrators, coarse quantizer, sample- and-hold and fine quantizer guarantee lowest input related noise of maximum 0.29 fC (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 components 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 component requirements and reduces the bill of material. Full-scale range, integration time and power mode are configurable over a SPI-compatible serial interface as well as the digital output modes of the LVDS interface. In low power mode, the power dissipation can be minimized down to 1.25 mW per channel for reduced self-heating of the CT detector. The adjustable integration time down to 51 µs allow very high frame rates. The operating range of AS5911 is specified from 0 °C to 85 °C.
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1.1 Key Benefits & Features
The benefits and features of AS5911, 256-Channel Low Noise Current-to-Digital Converter, are listed below: Figure 1: Added Value of Using AS5911 Benefits Features 256-channel in 14 x 14 mm² FBGA package No external components required. Integrated capacitors for supply and reference decoupling Ultra-low noise of 0.29 fC at 0.5 µA input current in low noise mode No charge loss. Continuous charge integration due to zero dead time of ADC architecture Lowest power dissipation of 1.25 mW per channel in low power mode Selectable full-scale range of 0.5 µA in low range and 1 µA in high range Adjustable integration time down to 51 µs (20 kSPS) at 20-bit resolution. Up to 26-bit at integration times of 1 ms. Adjustable full-scale range, integration time and power consumption via SPI interface as well as adjustable output modes via LVDS Zero biased photodiodes (true ground concept) for ultra-low dark currents Selectable power supply concept between dual ±1.5 V analog supply (true ground concept) or single +3.0 V analog supply Integral Linearity of ±0.080% of reading and ±0.2 ppm of full-scale range (all channels active) On-chip LDOs, voltage references and temperature sensor Automatic zero offset calibration, input charge calibration and linearity calibration Built-in diagnostic modes for testing full detector signal chain
1.2 Applications
- Medical, industrial and security CT scanner data acquisition
- Photodiode sensors
- Multi-channel sensors with current output
- DAS (Data Acquisition System) for current input
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1.3 Block Diagram
The functional blocks of this device are shown below: Figure 2: Functional Blocks of AS5911 for True Ground Concept x16 Fine quantizer A D 16:1 Multiplexer Decimation Filter & Data Processing AVDDR AVSS DVSS DVDD AVSSR AVSS_REF PD<0:> Positive LDO Negative LDO AGND ADC Coarse Quantizer Sample & Hold S/HINT PD<15> ADC S/HINT x16 A D PD<240> ADC S/HINT PD<255> ADC S/HINT x16 LVDS Interface CLK_P/N DATA1_P/N DATA2_P/N ACI_P/N ACO_P/N AGND_AC Ref. Buffer REF Internal Refernce Temperature Sensor Register Map Digital Control SCLK SCS_N SDI SDO RESET_N C11 VREF_INVREF_NEG C8/C9 C0/C6 C1/C5 AVDDB AVSSB_ PWR Digital LDO C7C10 VDDVSS AS5911 FBGA AVSSB_ SPVSSUB ACLK SYNC D_START DISCARD Built-in Diagnostic Auto Calibration Power Supply Monitors Heater
Ordering Information
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2 Ordering Information
Ordering Code Package Marking Delivery Form Delivery Quantity AS5911-FFBT FBGA 14 mm x 14 mm AS5911 Tape & Reel 500 pcs/reel
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3 Tape & Reel Information
Figure 3: Tape Dimensions(1) (1) All dimensions in millimeters. Compliance with EIA-481-E (2) Measured from centerline of sprocket hole to centerline of pocket. (3) Cumulative tolerance of 10 sprocket holes is ±0.2. (4) Other material available.
Tape & Reel Information Short Datasheet • PUBLIC DS001049 • v1-00 • 2023-Jan-27 10 │ 8 Figure 4: Reel Dimensions(1) (1) All dimensions in millimeters
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4 Revision Information
Document Status Product Status Definition Product Preview Pre-Development Information in this datasheet is based on product ideas in the planning phase of development. All specifications are design goals without any warranty and are subject to change without notice Preliminary Datasheet Pre-Production Information in this datasheet is based on products in the design, validation or qualification phase of development. The performance and parameters shown in this document are preliminary without any warranty and are subject to change without notice Datasheet Production Information in this datasheet is based on products in ramp-up to full production or full production which conform to specifications in accordance with the terms of ams-OSRAM AG standard warranty as given in the General Terms of Trade Datasheet (discontinued) Discontinued Information in this datasheet is based on products which conform to specifications in accordance with the terms of ams-OSRAM AG standard warranty as given in the General Terms of Trade, but these products have been superseded and should not be used for new designs Changes from previous version to current revision v1-00 Page This short datasheet is derived from v1-00 of full datasheet
- Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.
- Correction of typographical errors is not explicitly mentioned.
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5 Legal Information
Copyrights & Disclaimer Copyright ams-OSRAM AG, Tobelbader Strasse 30, 8141 Premstaetten, Austria-Europe. Trademarks Registered. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. Devices sold by ams-OSRAM AG are covered by the warranty and patent indemnification provisions appearing in its General Terms of Trade. ams-OSRAM AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein. ams-OSRAM AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with ams-OSRAM AG for current information. This product is intended for use in commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by ams-OSRAM AG for each application. This product is provided by ams-OSRAM AG “AS IS” and any express or implied warranties, including, but not limited to the implied warranties of merchantability and fitness for a particular purpose are disclaimed. ams-OSRAM AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligat ion or liability to recipient or any third party shall arise or flow out of ams-OSRAM AG rendering of technical or other services. RoHS Compliant & ams Green Statement RoHS Compliant: The term RoHS compliant means that ams-OSRAM AG products fully comply with current RoHS directives. Our semiconductor products do not contain any chemicals for all 6 substance categories plus additional 4 substance categories (per amendment EU 2015/863), including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, RoHS compliant products are suitable for use in specified lead -free processes. ams Green (RoHS compliant and no Sb/Br/Cl): ams Green defines that in addition to RoHS compliance, our products are free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) and do not contain Chlorine (Cl not exceed 0.1% by weight in homogeneous material). Important Information: The information provided in this statement represents ams-OSRAM AG knowledge and belief as of the date that it is provided. ams-OSRAM AG bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. ams-OSRAM AG has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ams-OSRAM AG and ams-OSRAM AG suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. Headquarters ams-OSRAM AG Tobelbader Strasse 30
8141 Premstaetten
Austria, Europe Tel: +43 (0) 3136 500 0 Please visit our website at www.ams.com Buy our products or get free samples online at www.ams.com/Products Technical Support is available at www.ams.com/Technical-Support Provide feedback about this document at www.ams.com/Document-Feedback For sales offices, distributors and representatives go to www.ams.com/Contact For further information and requests, e-mail us at ams_sales@ams.com