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AS585xB

General Description

Short Datasheet

• PUBLIC

DS001023

• v1-00 • 2021-Apr-08

9

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General Description

AS585xB is a family (AS5850B, AS5851B and AS5852B) of 16-bit, 256-channel low-noise charge-to-

digital converters designed for digital X-Ray systems. It enables a wide range of applications for digital

X-ray including static and dynamic Flat Panel Detectors (FPDs) used in radiographic imaging, digital

mammography, fluoroscopy, surgery and industrial non-destructive testing.

Each of the devices consists of 256 analog Charge Sensitive Amplifiers (CSA) with a programmable

full-scale range, a Correlated Double Sampler (CDS) for offset compensation with programmable time

constant and 128 multiplexed Analog-to-Digital Converters (ADC) for the digital readout of each pixel.

The device can be configured for electrons and holes polarity and includes a voltage reference and a

temperature sensor. Built-in diagnostic modes enable error detection in the signal chain.

The converted channels are output on a single LVDS interface with a data rate up to 320 Mbps for

optimized line time. The serial SPI interface allows the configuration of the analog frontend including

timing and different power modes for low stand-by power consumptions and fast startup times.

The AS5850 device is a high-speed design optimized for line times down to 20 µs for dynamic flat

panel detectors. In a special low-OSR (the ADC OverSampling Ratio) mode, it can reach even shorter

line times of 15 µs. Additionally, it is possible to bin together adjacent channels; with this binning, the

fastest achievable line time is 10 µs.

The AS5851 and AS5852 are low-power versions of AS5850 for static, portable and battery supplied

flat panels with minimum power dissipations down to 1.1 mW per channel.

AS585xB are the AS585x chips delivered on a Chip on Flex package to minimize sidewall distances

and allow direct assembly on the X-ray panel. The Flex design can be customized according to

customer requirements upon request. Alternatively, all devices can be delivered as die on foil.

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Key Benefits & Features

The benefits and features of AS585xB, 16-Bit 256-Channel Low Noise Charge-to-Digital Converters

are listed below:

Figure 1:

Added Value of Using AS585xB

Benefits

Features

256 Channels with 16-bit resolution

Flexible and simple configuration via SPI interface

supporting daisy-chaining multiple devices

Ultra-low noise down to 500 electrons at 2 pC

input range for hole and electron integration

Standard and customized flex delivery

Low power dissipation down to 1.1 mW per

channel at 80 µs line time

Different power-down modes down to 1 µW per

channel and fast start-up times