ams 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. It can measure time intervals as short as 5 ns with 10 ps precision.
The AS6500 is based on the existing ams TDC-GPX2, and offers resolution up to 10 ps on four channels and a sampling rate of up to 1,5 MSps. 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-centimetre detail.
The AS6500 is optimised for space, power and cost. Like the TDC-GPX2, it is an integrated four-channel converter IC offering single-measurement resolution of up to 20 ps RMS per channel in normal mode, and 20 ns pulse-to-pulse spacing. Operating in dual-channel high-resolution mode, it can achieve a maximum resolution of 10 ps RMS with 5 ns pulse-to-pulse spacing.
The AS6500 is housed in a new, smaller 40-lead QFN package with a footprint of just 6 x 6 mm, making it 56% smaller than the TDC-GPX2. Its highly integrated design, which includes a 2 MHz – 12,5 MHz reference clock input, means that few external components are required alongside the device.
Operating from a 3,3 V supply, the AS6500 typically consumes just 60 mW in normal operation, and draws 60 μA in standby 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.
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