The
MPX-08™, Multianode Photomultiplier Electronics, is a micropower
charge-integrating readout system optimized for pulse analysis for photomultiplier
tubes and similar detectors
Applications
The MPX-08 integrated circuit is an eight channel charge integrating
analog data acquisition system, suitable for measuring charges in the
range from several fC to over 10 pC. It has been developed primarily for
use with photomultiplier tubes and similar devices in applications involving
discrete charge pulse events. The signal range is typically from <1
photoelectron up to >50 photoelectrons, assuming a nominal PMT gain
of 10 6 . The MPX-08 should also be considered for applications involving
gas proportional detectors. It is also suitable for detectors operating
in current mode, or anywhere where a micropower multichannel gated electrometer
or picoammeter is called for. The MPX-08 is particularly well suited to
minimize power in large pulse-mode detector systems involving multi-level
triggering and a sparse hit pattern, such as a scintillating fiber tracker
for high energy charged particles.
Availability
The MPX-08™ can be supplied as individual chips, bare or in CQFP-64
packages. A readout system board with data acquisition software is also
available. Custom versions of the MPX-08 with more channels, modified
gain, or new capabilities may be developed. Inquiries into this are welcomed.
Specifications
Number of channels: |
8 |
Input amplifier feedback capacitance: |
Selectable 4.52 pF, 5.09 pF, 5.59 pF, or 6.16
pF |
Signal Range: |
7.1 pC, 8.1 pC, 8.7 pC, or 9.6 pC |
Input amplifier risetime: |
< 100 ns |
Cross-talk (with MAPMT/bias assembly connected): |
< 0.4 % |
Discriminator sensitivity: |
< 1 mV |
Discriminator prop. delay @ 10 mV thr., 35 mV
pulse: |
200 ns |
Discriminator prop. delay @ 10 mV thr., 14 mV
pulse: |
< 600 ns |
Nonlinearity (input to track/hold output): |
< 0.5% |
Input leakage current: |
< 2 pA |
Die size: |
2.1 X 2.1 mm2 |
Pad pitc: |
140 µm, 56 pads |
Images
The following pages contain images and data obtained using the MARY™
solid state pixel detector for X-ray imaging.
 The
MPX-08™ Block Diagram.
 The
MPX-08™ Readout Board.
Data
- Two different photoelectron pulse height spectra.
- Pulse height spectrum from scintillating
fiber and MAPMT with Sr90 source placed at two different distances from
the MAPMT.
Documents
- SPIE paper: "Design
and performance of a low power integrated circuit readout system for
multianode photomultiplier tubes"
- MPX-08™ Brochure with Specifications
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