6.1.2ADC

1.Successive approximation ADC with sliding scale linearisation

●Channel splitting 128, 256, 512, 1K, 2K, or 4K

●Full input voltage range 3V, positive and negative (10V with external attenuator)

2.ADC Dead time (including time needed to write into memory)

●< 8 µsec

3.Nonlinearities

●Differential nonlinearity (over 95% channel range) <2%

●Integral nonlinearity (over 95% channel range) <0.1%

4.Peak capturing

●Works with pulse of gaussian shaping amplifier (range of shaping time constant between 0.5µs and 5µs)

5.Temperature Stability

●TK 100 (ADC), TK 500 (Amplifier)

6.Discriminators and threshold

●Digital LLD and ULD (allows channelwise cutting)

●Analogue threshold (2...60% of ADC range)

●Multi Channel Scaling (MCS) mode allowing to count the following pulses

●TTL input pulses (minimum width of flat top 0.2µs) not routed through the ADC (maximum rate 1 MHz)

●LLD/ULD counting mode, counting pulses within a preset digital window

●Count rate derived from internal amplifier ICR signal (maximum count rate determined by count rate limitation of amplifier )

●Dwell time 0.01s to 500s

7.Spectrometric performance:

●Resolution (FWHM) for typical 500mm² planar HPGe detector for count rates < 10000cps and a Co-57 source at 122keV:

●610±20eV at 1µs shaping time

●580±20eV at 2µs shaping time

●Peak shift:

< 0.5% for 1µs shaping time and count rates from 1000 to 70000cps

< 0.2% for 2µs shaping time and count rates from 1000 to 40000cps

●deterioration of FWHM < 5% for both conditions

●Throughput in memory:

at least 25000cps in memory at 50000cps input rate and 1µs shaping time

at least 13000cps in memory at 30000cps input rate and 2µs shaping time

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Braun MCA166-USB user manual 2 ADC
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MCA166-USB specifications

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