AS5912 OSRAM
Document overview
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Technical content
Tobelbader Strasse 30, 8141 Premstaetten, Austria Phone +43 3136 500-0 ams-osram.com © All rights reserved AS5912 Datasheet
Short Datasheet • PUBLIC • Document Feedback DS001050 • v1-00 • 2024-Feb-16 2 / 9 Table of contents
Short Datasheet • PUBLIC • Document Feedback DS001050 • v1-00 • 2024-Feb-16 3 / 9 AS5912 512-channel low noise current-to- digital converter
1 General description
The AS5912 is an ultra-low noise, 512-channel low power current to digital converter that enables the readout of photodiodes of a CT detector with highest sensitivity. The output currents of 512 photodiodes are converted simultaneously into digital without any dead time resulting in no charge loss on the inputs. The AS5912 combines current-to-voltage integration and A/D conversion for 512-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 AS5912 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 AS5912 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 23 x 15 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.
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1.1 Key specifications & features
The benefits and features of AS5912, 512-channel low noise current-to-digital converter are listed below: Table 1: Key benefits & features Benefits Features 512-channel in a 23 x 15 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 and cross section
The functional blocks of this device are shown below: Figure 1: Functional blocks of AS5912 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<495> ADC S/HINT PD<511> ADC S/HINT x32 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 AS5912 FBGA AVSSB_ SPVSSUB ACLK SYNC D_START DISCARD Built-in Diagnostic Auto Calibration Power Supply Monitors Heater
Package drawings & markings Short Datasheet • PUBLIC • Document Feedback DS001050 • v1-00 • 2024-Feb-16 6 / 9
2 Package drawings & markings
2.1 Package drawings
Figure 2: FBGA400 package outline drawing of AS5912
Package drawings & markings Short Datasheet • PUBLIC • Document Feedback DS001050 • v1-00 • 2024-Feb-16 7 / 9 (1) All dimensions are in millimeters. Angles in degrees. (2) Dimensioning and tolerancing conform to ASME Y14.5M-1994. (3) Maximum solder ball diameter measured parallel to datum C. Post reflow diameter. (4) Datum C and seating plane are defined by the spherical crowns of the solder balls. (5) This package contains no lead (Pb). (6) This drawing is subject to change without notice. Figure 3: FBGA400 package marking/code of AS5912 YY Manufacturing Year WW Manufacturing Week X Assembly Plant Identifier ZZ Assembly Traceability Code @ Sublot Identifier XXXX ams OSRAM internal number 2D barcode
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3 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 Other definitions Draft / Preliminary: The draft / preliminary status of a document indicates that the content is still under internal review and subject to change without notice. ams-OSRAM AG does not give any warranties as to the accuracy or completeness of information included in a draft / preliminary version of a document and shall have no liability for the consequences of use of such information. Short datasheet: A short datasheet is intended for quick reference only, it is an extract from a full datasheet with the same product number(s) and title. For detailed and full information always see the relevant full datasheet. In case of any inconsistency or conflict with the short datasheet, the full datasheet shall prevail. Changes from previous released 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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4 Legal information
Copyright & 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 obligation or liability to recipient or any third party shall arise or flow out of ams-OSRAM AG rendering of technical or other services. Product and functional safety devices/applications or medical devices/applications: ams-OSRAM AG components are not developed, constructed or tested for the application as safety relevant component or for the application in medical devices. ams-OSRAM AG products are not qualified at module and system level for such application. In case buyer – or customer supplied by buyer – considers using ams-OSRAM AG components in product safety devices/applications or medical devices/applications, buyer and/or customer has to inform the local sales partner of ams-OSRAM AG immediately and ams-OSRAM AG and buyer and /or customer will analyze and coordinate the customer-specific request between ams-OSRAM AG and buyer and/or customer. ams OSRAM semiconductor RoHS compliance statement RoHS compliant: The term RoHS compliant means that ams-OSRAM AG semiconductor 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. 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 ams-osram.com For information about our products go to Products For technical support use our Technical Support Form For feedback about this document use Document Feedback For sales offices and branches go to Sales Offices / Branches For distributors and sales representatives go to Channel Partners