DP5 Specifications
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DIGITAL PULSE PROCESSOR Features • Replaces both shaping amplifier and MCA • Supports both reset and feedback preamplifiers of either polarity • Configurable with a charge sensitive preamplifier for use with PMTs • For OEMs or custom laboratory users • Highly configurable • X-ray and gamma ray detectors • Nuclear Instrumentation • Portable, battery operated systems • OEM & Special Applications • Process Control • Research and Teaching Pulse Processing & MCA • Trapezoidal shaping • Peaking time commandable from 0.1 to 102.4 µs • Commandable flat top duration from 0.05 to 51.2 µs • 4,000,000 cps periodic • Pile-up rejection & risetime discrimination • Up to 8k output MCA channels Communications • Interfaces: RS-232, USB, Ethernet, I2C, auxiliary • Oscilloscope mode - DAC output for pulse monitoring and adjustment • Onboard µcontroller with 8051-compatible core • Software for PC data acquisition and control (includes API) • Many configurable auxiliary inputs and outputs Shown in Actual Size: 3.5 in. x 2.5 in Physical • Low Power: 600 mW typical • Small Size: 3.5 in x 2.5 in 1) DP5 Input (Preamp Output) The Amptek DP5 is a state of the art, high performance, low power digital pulse processor. It digitizes the preamplifier output signals, replacing both the shaping amplifier and MCA in a traditional, analog spectroscopy system. The DP5 offers several clear advantages over traditional systems, including improved performance (very high resolution, reduced ballistic deficit, higher throughput, and enhanced stability), enhanced flexibility, low power consumption, small size, and low cost. The DP5 represents the latest generation in digital pulse processing, an enhanced replacement for Amptek’s DP4. The DP5 operates at higher count rates than the DP4, with faster shaping times, better pile-up rejection, and better dead time correction; offers lower electronic noise and a wider gain range; includes additional features such as a “List Mode” and additional spectral display options; and improved interfacing, including faster serial communication, an Ethernet interface, and onboard power supplies. Its physical dimensions are compatible with the DP4. The software is designed to be as backward compatible as possible: software written for the DP4 will be fully functional, reproducing the DP4’s capabilities, while additions with minor changes to the software will permit access to the full capabilities of the DP5. The DP5 is suitable for OEMs and for users needing custom capabilities. 5 mV/div 20 µs/div 3) DP5 Shaped Output 2) Prefilter Output (ADC Input) Both traces: 200 mV/div 20 µsec/div 4) Multichannel Analyzer Output Mn Pb Mo K Trace 1 above shows the input to the DP5, which is the output from a reset-type charge sensitive preamplifier. This is processed by the analog prefilter producing the prefilter output shown in Trace 2. This is digitized and then processed digitally, producing the DP5’s shaped output shown in Trace 3. Finally, the DP5 creates a multichannel anlayzer (MCA) type output spectrum shown in Graph 4. 14 DeAngelo Drive, Bedford MA 01730

Specifications Pulse Processing Performance Silicon Labs 8051F340 8051-compatible core. External Memory Signal processing is programmed via firmware, can be upgraded in the field. Combination of coarse and fine gain yields overall gain continuously adjustable from x0.84 to x127.5. Coarse Gain 16 log spaced coarse gain settings from x1.12 to x102.00 1.12 Standard serial interface ≤115 Kbaud. Fine Gain Adjustable between 0.75 and 1.25, 10 bit resolution Standard 2.0 full speed (12 Mbps). Full Scale 1000 mV input pulse @ x1 gain. Gain Stability Analog Input Pulse Shape Trapezoidal...

Auxiliary Inputs and Outputs The primary purpose of this connector is to bring out logic signals which are not required for the primary use of the DP5: acquiring spectra and transmitting them over the serial interface. These are generally “low level” logic signals associated with each pulse processed by the DP5. They are primarily used for synchronizing the DP5 data acquisition to external hardware and for direct counter/timer outputs from the DP5. The signals are described below. The connector is a 2x8 right angle Samtec part number ASP-135096-01. Single Channel Analyzers 8 SCAs,...

PC5 and Interface The DP5 itself has its own power supplied so only needs a +5 V DC input. When using the DP5 with Amptek detectors, additional power supplies are needed for the detector and preamp. Amptek provides the PC5 board that mates with the DP5 and provides power to Amptek detectors. The PC5 provides power to Amptek XR-100 detectors from a +5 VDC source. This board is intended for those using Amptek detectors and preamps. The USB interface cannot supply enough current to operate the XR100, so an external DC supply is required, which must be between 2.5 and 5.5 V. DP5 (top) mated...