Dual Timing ADC Model 7072T, ADC / TDC / SVA

The Model 7072T is a unique dual channel device that can operate either as an ultra fast analog-to-digital converter with a fixed conversion time of 500 ns*, a time-to-digital converter (TDC) or an analog SVA . The 7072T is ideally suited for high counting rate applications in energy and time Spectroscopy. The combined ADC/TDC function finds applications in time resolved photon, ion-, neutron- and X-ray imaging.

The built-in Single Channel Analyzer has a separate output on the front panel. This output can be used in the ADC and SVA mode. An analog output is available for monitoring the TDC.

In the SVA mode a voltage level or waveform can be sampled when a gate signal is applied.

*) Conversion time of ADC. For dead time calculation add time-to-peak and 100 ns transfer time to data buffer.

  • Three individually selectable modes of operation for each input channel: 

    •  ADC mode with 500 ns Fixed Conversion Time
    • TDC mode with <<25 ps Time Resolution
    • ADC/SVA (Analog Sampled Voltage Analysis) mode

  • Full 8k Conversion Gain and Range
  • Dual 10-LED Indicator bar for Instantaneous Dead-Time display, level setting
  • Lower Level and Upper Level Discriminator on each ADC input
  • Three modes of operation independently selectable for each input channel: Pulse Height Analysis with automatic peak detection / Time-to-Digital conversion and Analog Input Sampling selectable by frontpanel switch
  • Simultaneous Single-Channel Output / TDC Monitor
  • Designed for easy interfacing to our MCA-3, SPA-3, MPA-3, MPA4, MPA4T multichannel analyzers, MCA's from other manufacturers (special cable and external ADC interface required)

Physical 
Size: single width NIM module (1.35 x 8.71 inches;
3.43 x 22.13 cm) as per TID - 20893

Shipping weight: 1.8 kg (net 1.0 kg), Front Panel Control push-buttons 

Conversion Range: Push button switch selects quantization of 256, 512, 1k, 2k, 4k, or 8k channels for full scale input.

Time Range: Push button switch selects full scale time range of 50 ns, 100 ns, 200 ns, 500 ns, 1, 2, 5, 10, 20 µs 

Coincidence/Anticoincidence: Push button switch selects COINCIDENCE/ANTICOINCIDENCE mode 

LLD: adjustment by up/down pushbutton sets the lower level discriminator. The voltage is displayed on the DEADTIME/LEVEL LED indicator and output on the monitor connector for precise adjustment

ULD: adjustment by up/down pushbutton sets the upper level discriminator. The voltage is displayed on the DEADTIME/LEVEL LED indicator and output on the monitor connector for precise adjustment 

Front Panel Mode Control Switches
PHA: Pulse Height Analysis mode.
SVA: Analog Sampled Voltage Analysis
TDC: Time to Digital Converter

Indicators 
DEADTIME/LEVEL: Dual 10 LED-bar indicates activity of the ADC. Range 0 to 100% deadtime or actual voltage level indication of ULD and LLD setting

RANGE/MODE: ADC range 256 to 8k in binary steps, TDC range from 50 ns to 20 µs full scale.

ADC Performance Conv. Range 4K Conv. Range 8K
Resolution: 500 ns flattop pulses <3.4 chan FWHM
Integral Nonlinearity linear fit +/-0,16% typical +/-0,16% typical
Differential Nonlinearity incl. Effects of int.NL +/-0,7% +/-1,1%
Differential Nonlinearity for 99% of useable channels +/-0,5% +/-0,7%
Counting Rate Capability > 1.000.000 events/s
Peak shift up to 700 kcounts/s SVA mode +/-0,006%
Peak shift up to 1.000 kcounts/s SVA mode +/-0,08%
Unused channels approx. Top 1% of range
TDC Performance Conversion Rang 8K
Resolution @ 50 ns time range < 4.1 chan FWHM
Integral Nonlinearity 50 ns range, linear fit +/-0,12% typical
Differential Nonlinearity 50 ns range +/-0,5%
Differential Nonlinearity for 99% of useable channels +/-0,4%
Counting Rate Stability up to 100 kcounts/s +/-0,003%