VITUS
H20LE

30 mm² collimated to 20 mm² X-ray Silicon Drift Detector for Low-Energy XRF – EDX – TXRF – Applications

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VITUS H20LE in TO8 housing with AP3.3 polymer window
Open VITUS H20LE with on-chip Pd collimator

Unique Features

Large area low-energy module
Ultra thin polymer window
Sensitive down to Boron Kα at 185 eV

KEY PARAMETERS
(Guaranteed Values)

**Table 1:** Beyond the guaranteed minimum key parameters shown in the table above, typical energy resolution of a VITUS H20LE SDD is better than 128 eV.
	CUBE CLASS
First amplification stage	ASIC
FWHM Mn Kα (5.9 keV)	≤ 129 eV
FWHM C Kα (277 eV)	≤ 70 eV
Peak to background	> 10,000
Peak to tail	> 2,000
Optimal peaking time at max. cooling	1 µs
Absorption depth Si	450 µm
Peak shift stability up to 100 kcps	< 1 eV
Max. input countrate	2,000 kcps
Windows	AP3.3 polymer
Cooling performance at +30°C heat sink temperature	∆T > 65 K
On-chip collimator	Pd
Ordering codes	V000-C7T0-H020-PD3E 129

Spectrum

Figure 1: The spectrum has been acquired in KETEKs standard end qualification test stand with an Fe-55 source using an XIA Mercury signal processing unit. The input count rate has been 10 kcps at a peaking time of 1 µs. The spectrum shows a very good energy resolution for Mn-Kα and an excellent peak-to-background ratio.

Energy Resolution

Figure 2: The energy resolution of the VITUS H20LE is dependent on both, the peaking time and the operating temperature. Depending on the application the best performance can achieved by an appropriate selection of peaking time and set operating temperature.

Figure 3: The VITUS H20LE shows excellent energy resolution stability for different input count rates up to reasonable deadtimes at each peaking time. The data was measured at optimum cooling with an Fe-55 source using an XIA Mercury signal processing unit.

OPERATION REQUIREMENTS

SDD Voltages and Currents

Ring1 (R1)	-20 V ± 5 V	10 µA typ.
RingX (RX)	-130 V ± 20 V	10 µA typ.
Back	-60 V ± 5 V	< 1 nA
Peltier Element	4 V	1000 mA max.

General parameters

Temperature Monitor	NTC thermistor	10 kΩ @ 25 °C
Output signal	ramped reset type	–

CUBE based SDDs

V_I/O	3.3 V ± 0.1 V	< 1 mA
V_s	2 V ± 0.1 V	< 1 mA
V_sss	-5 V ± 0.1 V	< 1 mA
Output gain	1.6 mV/keV ± 20 %	–

Operation

Pin wiring according to VITUS Operation Block Diagram
Detector operating voltages should be RC low-pass filtered and linearly regulated (KETEK electronics recommended)
KETEK reset type charge sensitive pre-amplifier with internal triggered reset pulses recommended
Short wiring length between detector and pre-amplifier recommended
Detector may only be operated with an appropriate heat sink