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Compact ams time-to-digital converter provides high precision in optical ranging and 3D scanning

05 March 2019
AS6500 in small 6mm x 6mm package measures time intervals to a resolution of 10ps

Premstaetten, Austria (5 March, 2019) -- ams (SIX: AMS), a leading worldwide supplier of high performance sensor solutions, has introduced the AS6500, a new high-resolution time-to-digital converter (TDC) featuring CMOS inputs and compact packaging for use in space- and cost-constrained applications.  TDCs from ams can measure time intervals as short as 5ns with 10ps precision. The AS6500 is based on the existing ams TDC-GPX2, and offers resolution up to 10ps on four channels and a sampling rate of up to 1.5Msamples/s.

With high precision and a high sampling rate, light detection and ranging (LIDAR) and optical ranging systems in cars, drones and robots can make extremely detailed and accurate ranging measurements with a wide field of view, enabling them to perform accurate object detection and avoidance. In virtual- and augmented-reality applications, real-time 3D image rendering is supported by high sampling speeds and precision in one-centimeter detail. 

The AS6500 TDC is optimized for space, power and cost. Like the TDC-GPX2, it is an integrated four-channel converter IC offering single-measurement resolution of up to 20psrms per channel in normal mode, and 20ns pulse-to-pulse spacing. Operating in dual-channel high-resolution mode, it can achieve a maximum resolution of 10psrms with 5ns pulse-to-pulse spacing. 

The AS6500 is housed in a new, smaller 40-lead QFN package with a footprint of just 6mm x 6mm, making it 56% smaller than the TDC-GPX2. Its highly integrated design, which includes a 2MHz12.5MHz reference clock input, means that few external components are required alongside the device.

Operating from a 3.3V supply, the AS6500 typically consumes just 60mW in normal operation, and draws 60µA in stand-by mode. It supports CMOS interfaces from a host system, and provides its calibrated output as a digital signal over a standard serial peripheral interface (SPI), for easy data processing in a host controller or processor.

The AS6500 is ideal for optical applications including general-purpose laser distance measurement in 1D, 2D and 3D, speed control, vehicle/truck scanning, object recognition, time-of-flight spectroscopy, automated test equipment (ATE), biomedical technology and analytics.

ams supplies a development kit, the AS6500-QF_DK, which includes a programmer and GUI software for PCs, enabling users to configure and connect their Start and Stop signals and begin taking sample time measurements within minutes. 

“Increasing numbers of design teams are looking to implement laser ranging or 3D scanning systems in handheld or consumer devices, and limited space on the board is, in many cases, a design constraint. Using the AS6500 enables designers both to achieve very high levels of accuracy and precision, and to restrict the board footprint to a very small size,” said Norbert Breyer,  Product Manager at ams.

“The AS6500 provides a critical block of an optical sensor system, and is compatible both with today’s AFD-based and with future SPAD-based receiver components,” he added.  The AS6500 is available now in production volume. Unit pricing is available on request from ams. For more technical information, go to

About ams

ams is a global leader in the design and manufacture of advanced sensor solutions. Our mission is to shape the world with sensor solutions by providing a seamless interface between humans and technology.  ams’ high-performance sensor solutions drive applications requiring small form factor, low power, highest sensitivity and multi-sensor integration. Products include sensor solutions, sensor ICs, interfaces and related software for consumer, communications, industrial, medical, and automotive markets.  With headquarters in Austria, ams employs about 10,000 people globally and serves more than 8,000 customers worldwide. ams is listed on the SIX Swiss stock exchange (ticker symbol: AMS). More information about ams can be found at

  • ams Sensors Germany GmbH 
    Göschwitzer Str. 32
    07745 Jena
    Germany / Europe
    Tel.: +49 3641 2809-0
    Fax: +49 3641 2809-12
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