Datasheet

HCA-4M-500K-C
High Speed Current AmplifierFeatures






Bandwidth and Frequency Response Independent ofDetector Capacitance (up to 500 pF)
Low Noise 3.5 pA/√
√Hz Equivalent Input Noise Current
Bandwidth DC ... 4 MHz
5Transimpedance (Gain) 5 x 10 V/A
Protection against ± 3.5 kV Transients

Applications






Photodiode and Photomultiplier Amplifier
Spectroscopy
Charge Amplifier
Ionisation Detectors
Preamplifier for Lock-Ins, A/D Converters, etc.

Specifications

Test Conditions

Vs = ± 15 V, Ta = 25°C

Gain

TransimpedanceGain Accuracy

5 x 10 V/A (@ 50 Ω load)±1%Frequency Response

Lower Cut-Off Frequency
DCUpper Cut-Off Frequency (- 3 dB) 4 MHz
Rise / Fall Time (10 % - 90 %)90 ns
Gain Flatness± 0.3 dB

Input

Equ. Input Noise Current
Equ. Input Noise Voltage
Input Bias Current
Input Bias Current Drift
Offset Current Compensation
Input Current Range
Input Offset Voltage
DC Input Impedance

3.5 pA/√Hz (@ 100 kHz)
0.8 nV/√Hz (@ 100 kHz)
18 µA typ.
0.8 nA / K± 6 µA adjustable by offset trimpot± 3 µA (for linear amplification)
3 mV
50 Ω (virtual) // 5 pF

OutputOutput Voltage Range
Output Impedance± 1.5 V (@ 50 Ω load)
for linear operation and low harmonic distortion
50 Ω (terminate with 50 Ω load for best performance)

Bias Output Voltage Range
Bias Output Impedance± 12 V, adjustable by bias trimpot
10 kΩ // 1 µF

Bias Output

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Datasheet

HCA-4M-500K-C
High Speed Current Amplifier

Specifications (continued)
Power SupplySupply Voltage
Supply Current± 15 V± 50 mA typ.
(depends on operating conditions, recommended
power supply capability minimum ± 150 mA)

CaseWeightMaterial

210 g (0.5 lbs)
AlMg4.5Mn, nickel-plated

Temperature Range

Storage Temperature
Operating Temperature-40 ... +100 °C
0 ... +60 °C

Absolute Maximum Ratings

Input Voltage
Input Voltage TransientPower Supply Voltage±5V± 3.5 kV (pulsewidth 10 ns)± 22 V

Connectors

Input
OutputPower Supply

BNCBNCLEMO series 1S, 3-pin fixed socket
Pin 1:+ 15V
Pin 2:- 15VPin 3:
GND
PIN 2-Vs

PIN 1+Vs
PIN 3
GND

Application Diagrams

Photo Detector Biasing in Photoconductive Mode:
Best choice for high speed applications andoptimum signal to noise performance.

U se ad ditio na l
Bypass C apacitor
close to D e te ctor(~ 100 n F, C e ra m ic)

STABILIZ E D
BIAS VO LTAG E
O U TP U T

HCACURRENTIN P U T

H ig h -S pee dC urren t to Voltag eC onve rter

I/UC onn ect the D e te ctora s close as p ossible
to th e Am plifier.

+1 2 VBIAS
10 kΩ
4 70 nF-1 2 VA Z 0 1 -0 2 0 1 -2 0

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HCA-4M-500K-C
High Speed Current Amplifier

Dimensions

94 mm
87 mm

15 mm

74 mm

OUT

12 mm

51 mm

HCA

44 mm

INPOWER

22 mm∅ 3.3 mm

27 mm

14 mm

41 mm

DZ01-0201-22

FEMTO Messtechnik GmbHPaul-Lincke-Ufer 34
D-10999 Berlin  Germany
Tel.: +49 (0)30 – 4 46 93 86
Fax: +49 (0)30 – 4 46 93 88
e-mail: info@femto.de
http://www.femto.deSpecifications are subject to change without notice. Information furnished herin is believed tobe accurate and reliable. However, no responsibility is assumed by FEMTO MesstechnikGmbH for its use, nor for any infringement of patents or other rights granted by implicationor otherwise under any patent rights of FEMTO Messtechnik GmbH. Product names
mentioned may also be trademarks used here for identification purposes only.
 by FEMTO Messtechnik GmbH
Printed in Germany

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