Time-to-Digital Converters

AS6501 Time-to-Digital Converter

2-Channel TDC with LVDSA Inputs/Outputs

The AS6501 is a high performance 2-channel time-to-digital converter (TDC) frontend device based and derived from TDCGPX2. Highest measurement performance and highest data throughput is achieved with LVDS stop inputs and LVDS serial outputs for each channel. Current saving operation is also possible with CMOS inputs and SPI readout.
High configuration flexibility and unlimited measurement range cover many applications. They range from portable handheld laser range equipment to ambitious time-of-flight measurements of highest performance, as e.g. done in medical imaging applications. AS6501 operates without any locked loop technologies. AS6501 calculates all stop measurements inside, proportional to the applied reference clock. Combinations of best single shot accuracy of 10 ps with lowest pulse-to-pulse spacing <5 ns and maximum data throughput rate of 70 MSPS per stop input are possible.

Product Status: Production

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Features

2 stop channels with 5 ns / 20 ns pulse-to-pulse spacing
Maximum 70 MSPS per LVDS output
Event assignment thanks to reference clock & index simplifies coincidence measurements
Single shot accuracy 20 ps RMS resolution per channel, 10 ps RMS with high resolution option
Easy pulse width measurements
Unlimited measuring range 0s to 16s
High efficiency thanks high sample rate
Differential reference clock input 2 MHz to 12.5 MHz, optional with quartz
Compact design thanks to small package and low number of external components
LVDS inputs and outputs, 16-stage FIFO per channel, SPI compatible 4-wire interface for configuration, optionally to be used for data readout
Reduced cooling thanks to low power consumption
Automatic calibration to reference clock
Supply voltage 3.3 V
Power dissipation up to 450 mW, standby current 60 μA
QFP48 package (7 x 7 mm², 9 × 9 mm² with leads)