MPR-16/L
MPR-32 / MPR-64

16 / 32 / 64 - foldcharge sensitive preamplifier(Data sheet V7.0_01)

The mesytec MPR-Series provides a set of state of the art multichannel preamplifier modules specially designed for single or double sided multistrip silicon detectors.The MPR series can be used as stand alone modules and can also easily be combined with the mesytec MSCF-16 or STM-16 shaping-/timing filter/ discriminator module.
Features:•••••••

16 / 32 / 64 channel compact module
Sensitivity switch, factor 5
ESD input protection
Differential output 100 Ω orMPR-16L with Lemo output connectors
Pulser input
Bias voltage up to ±400 V
PCB module available for vacuum use

Shematics:

ESDprotection(for MPR-16)

10 n

Gain
stage
1/5

Input

Diff.
Output

10 M...

15 further
branches

Diff.
Outputs•1M

HV

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

MPR-16 / 32 / 64

mutichannel preamplifier

Technical DataEnergy ranges

The MPR series provides a switch to amplify theoutput signal by a factor of 5. This helps to provide large output signals even at low charge depositions and thus provides good noise immunity.

powermodeLPHP

Input stage••

Input connector(s): SubD25 female connector(for a 16 channel unit)
Pin assignment:
FunctionSig-gnd
Cha 1
Cha 2
Cha 3
Cha 4
Cha 5
Cha 6
Cha 7
Cha 8

•
•

connector Function connector
1,2,7,12,13,
Cha 9
1914,15,25
11
Cha 10623
Cha 11
1810
Cha 12522Cha 13179
Cha 14421
Cha 15168
Cha 16320guardring
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.

Output stage••••

Differential output for twisted pair 34 pin maleheader connector.
Output amplitude: 0 to ±1 V
(max swing ±4 V)
Pin assignment of output connector:
pin 1, 2 channel 1, pin 3, 4 channel 2…..
pin 33, 34 output ground

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

 / FWHM [us]0.4 / 1
1 / 2.5
0.4 / 11 / 2.5

The pulser is internally distributed to individual
charge termination capacities. Tolerances ±10 %.
MPR1625
0.78 pF

17 MeV/V

MPR16100
0.78 pF
or
1.13 pF

MPR16500

MPR161500

2.4 pF10.2 pF

17 MeV/Vor
50 MeV/V 230 MeV/V25 MeV/VDetector bias input•••

Lemo connector
Maximum voltage ±400 VWhen not connected, detector side must be on
ground level: terminate bias input with 50 ΩLemo terminator.

Ground connections•••

Rise and decay time

NoiseMPR16-25
MPR16-100
noise [keV](5 + 0.06/pF)(4 + 0.04/pF)(5 + 0.04/pF)(4 + 0.027/pF)

Pulser input•Standard decay times are 10 us, 20 us, 50 us,100 us. Risetime is 12 ns for 0 pF input capacity.

shaping time

Ground screws on front and rear side
There are two different groundconnections: input and output ground.
Input ground is connected to the vacuum
vessel if the setup is not isolated(ie. isolated flange).
In critical environment the output ground canbe connected to the NIM electronics.

Power connector

SubD-9 connector:•••••

1, 2 = gnd
3 = +6 V
4 = +12 V
5 = –6 V
6, 7, 8, 9 do not connect !

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

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MPR-16 / 32 / 64

mutichannel preamplifier

Pinout of on board power connector
for PCB version••••••gnd+12 V+6 V–6 V
LED+
LED–:
:
:
:
:
:

1,3,10,11,127
5913 ("power ok" LED)
14For Revision V70 and higher:• range: 6 (leave open if switch is used)• high gain → connect to gnd
low gain → connect to +3 V...+6 V
Power consumption for 16 channels

Parameter
LP/HP +6 V
LP/HP –6 V
LP +12 V
HP +12 V
total power
LP-modetotal power
HP-modeMPR16-25
MPR16-100

MPR16-500
MPR16-2500

current [mA]
50504080505040

1.1 W-1.6 W

1.1 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 to warm up silicon detectors by thedissipated power.
Dimensions•••

LengthWidthHeight: 173 mm (without connectors): 105 mm
: 46 mm (MPR-16)
67 mm (MPR-32)
92 mm (MPR-64)

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

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