MPRT-16(Data sheet V1.1_01)

16 channel low noise
preamplifier
with trigger output

mesytec MPRT-16 is a state of the art multichannel charge integrating preamplifier. It includes a timing path with discriminators, providing a trigger to start external electronics.
Three output options are available: differential header, unipolar output with header or unipolar output with lemo connectors. The preamplifier gain can be switched in 4 steps, each
multiplying the signal by 2, providing an overall maximum range variation of a factor of 8.
Features:• 16 channel compact module• Sensitivity switch, factor 1, 2, 4, 8
• Input protection• Pulser input• Bias voltage up to 600 V• Header or Lemo output• NIM-trigger output• 2 Timing Filter outputs for groups of 8channels
Schematics:

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-39
info@mesytec.com - www.mesytec.com

MPRT-16

16 channel preamp w. trigger

Technical Data
Timing Filter Outputs
Input stage• Input connector: SubD-25 female connector• Pin assignment:Function connector Function connector
Sig-gnd1, 2, 7, 12,13, 14, 15, Cha 92519

Cha 1

11

Cha 106

Cha 223

Cha 1118

Cha 3

10

Cha 125

Cha 422

Cha 13

17

Cha 5

9

Cha 14

4

Cha 621

Cha 1516

Cha 78Cha 163

Cha 820guardring

24• Positive and negative charge can be amplified
equally• The guardring output (24) is connected via
R-C-R filter (100 kΩ, 10 nF, 100 kΩ) to thecommon detector bias input.
Sensitivity selection

Rotary switch setting
Example 100 MeV typesetting

Maximumrange

Required Input
Charge012.5 MeV

pos

125 MeVpos

250 MeV

pos

3100 MeV

pos

45-12.5 MeV-25 MeV

neg
neg

6-50 MeV

neg

7-100 MeV

neg

Note: The rotary switch setting does not influence
the preamp output signal polarity!

MPRT provides two timing filter outputs. The signals are generated from the sum of channel 1..8and 9..16. The signals are negative and are scaled
and polarized with the rotary switch setting. Output amplitudes : -1.5 V for maximum range in asingle channel. The amplitude will vary to someextent with detector capacity and signal risetime.
The timing filter default time constants are:integrating 250 ns, differentiating 450 ns.
Discriminators

MPRT provides a NIM trigger output, which is
the ored sum of its 4 leading edge discriminators,
working each on the analog timing filter sum of
4 channels. Multiple discriminators are used toprovide a high quality, low jitter NIM signal. The
discriminators have a common threshold, which
can be adjusted via 10-turn potentiometer. The
threshold value is available at the sense output.
-4.5 V correspond to 45 % full range of a singlechannel.
Example-1 V threshold voltage in the 25 MeV range
means 10% which corresponds to 2.5MeV
threshold value.
Note that a pulser applied on all channels (for example when applied to the pulser input) will add
up in a group of 4 channels, so a pulser corresponding to 0.65 MeV will pass the 2.5 MeV
threshold and creates triggers !!
Detector bias input• Lemo connector• Maximum voltage 400 V• When detector side must be on ground level:terminate bias input with 50 ΩGround connection• Ground screw on rear side
Output stage• Differential output for twisted pair 34 pin maleheader connector.
• Output amplitude: 0 to 4 V(terminated:  2 V)
• For the unipolar 4 V output: 4 V unterminated,2 V terminated with 50 Ω (positive input
charge → positive output voltage)• Pin assignment of output connector:• pin 1, 2 channel 1, pin 3, 4 channel 2…
• pin 33, 34 output groundmesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30, fax: +49 - 89 / 456007-39
info@mesytec.com - www.mesytec.com

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MPRT-16
Rise and decay timeStandard decay time is 35 s.
Risetime is 10 ns for 0 pF input capacity.

Power consumption for 16 channels
Parameter MPRT16-25
MPRT16-100

MPRT16-300
MPRT16-1000

current [mA]Noise

For the MPRT-16 series, power modes can beselected by a jumper on the PCB.
High Power mode reduces noise, while low Powermode may be useful for in vacuum use.
power mode

LPHP

shaping time

MPRT16-25
MPRT16-100

 / FWHM[us]

Noise [keV]

0.4 / 1(5 + 0.06/pF)

1 / 2.5(4 + 0.04/pF)

0.4 / 1(5 + 0.04/pF)

1 / 2.5(4 + 0.027/pF)

Pulser input

The pulser is internally distributed to individual
charge termination capacities. Tolerances ±10 %.
MPRT1625

MPRT16100

0.78 pF
17 MeV/V

0.78 pF or
2.4 pF10.2 pF
1.13 pF
50 MeV/V 230 MeV/V=17 MeV/Vor 25 MeV/V

MPRT16 MPRT16-3001000Detector bias input• Lemo connector• Maximum voltage ±600 V• When connected detector side must be on
ground level: terminate bias input with 50 ΩLemo terminator.
Pinout of on board power connector
for PCB version

••
•
•
•
•
•
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16 channel preamp w. trigger

gnd:+12 V:+6 V:-6 V:
TF_out_0:
TF_out_1:
LED+:
LED-:

1, 3, 11759101213 (“power ok” LED)
14

LP/HP +6 V

80

80

LP/HP -6 V80

80

LP +12 V50-

HP +12 V

100

50Total power
LP-mode1.6 W-Total power
HP-mode

2.2 W

1.6 W

LP = low power mode, HP = high power mode
Cooling

Due to the low power consumption cooling is notnecessary.
For in vacuum use, select low power mode ifpossible. The power of a single PCB can be dissipated without problems. If several PCBs aredensely packed, heat conducting metal shields
should be placed in between the PCBs. Avoid towarm up silicon detectors by the dissipated power.
Power connector

Sub-D 9 connector:• 1, 2 = gnd• 3 = +6 V
• 4 = +12 V• 5 = -6 V
Power supply+6 V, 80 mA-6 V, -80 mA+12V, 100 mA
Dimensions• Length:• Width:• Height:

mesytec GmbH & Co. KG
Wernher-von-Braun-Str. 1, D-85640 Putzbrunn, Germany
phone: +49 - 89 / 456007-30, fax: +49 - 89 / 456007-39
info@mesytec.com - www.mesytec.com

173 mm (without connectors)
105 mm
46 mm

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