Datasheet

LCA-400K-10M
Ultra-Low-Noise Current AmplifierFeaturesBandwidth and Frequency Response Independent ofDetector-Capacitance (up to 1 nF)
Extremely Low Noise, 65 fA/√
√Hz Equivalent Input Noise Current
Bandwidth DC ... 400 kHz
7Transimpedance (Gain) 1 x 10 V/AApplications






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

TransimpedanceAccuracy

1 x 10 V/A (>10 kΩ Load)± 1%

Frequency Response

Lower Cut-Off Frequency
Upper Cut-Off Frequency
Rise- / Fall-Time
Gain Flatness

DC400 kHz (- 3 dB)
1 µs (10% - 90%)
± 0.1 dB

Input

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

65 fA/√Hz (@ 10 kHz)
5 nV/√Hz (@ 10 kHz)
2 pA typ.
Factor 1.7 / 10 K
± 300 nA, Adjustable by Offset-Trimpot± 1 µA (Linear Amplification)< 1 mV50 Ω (Virtual) // 5 pF

OutputOutput Voltage
Output Impedance
Max. Output Current± 10 V (>10 kΩ Load)
50 Ω (Terminate with >10 kΩ for best Performance)± 10 mA (Linear Amplification)

Power Supply

Supply Voltage
Supply Current± 15 V± 40 mA typ.

Case

WeightMaterial

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

Temperature Range

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

Absolute Maximum Ratings

Input Voltage
Power Supply Voltage±5V± 22 V

7

SOPHISTICATED TOOLS FOR SIGNAL RECOVERY
LCA-400K-10M/CG/R5/09FEB05/ Page 1 of 3

Datasheet

LCA-400K-10M
Ultra-Low-Noise Current Amplifier

Connectors

Input

BNC

Output

BNC

Power Supply

LEMO Series 1S, 3-pin Fixed Socket
Pin 1:+ 15V
Pin 2:- 15V
Pin 3:GND
PIN 2-Vs

PIN 1+Vs
PIN 3
GND

Application Diagrams

Photo Detector Biasing in Photovoltaic Mode:Use for Low Speed Applications and Minimum Dark Current.
LCA

CURRENTIN P U T

U ltra-L ow -N o ise
C u rren t to Vo ltag eC o nverter

I/UA Z 0 2 -0 1 0 1 -2 0

Photo Detector Biasing in Photoconductive Mode:Use for Fast Applications and if More Dark Current is Tolerable.
Bias Voltage Decreases Detector Capacitance.
+ BIA SVO LTAG E
U se ad ditio nal
Bypass C apacitor
clo se to th e D etector(~ 100 n F, C e ram ic)

LCA

CURRENTIN P U T

U ltra-L ow -N o ise
C u rren t to Vo ltag e
C o nverter

I/U

A Z 0 1 -0 1 0 1 -2 0

SOPHISTICATED TOOLS FOR SIGNAL RECOVERY
Page 2Datasheet

LCA-400K-10M
Ultra-Low-Noise Current Amplifier

Dimensions

94.0 mm15.0 mm

87.0 mm74.0 mmLCAOUT
51.0 mm

11.8 mm

44.0 mmINPOWER∅ 3.3 mm

DZ01-0101-21

FEMTO Messtechnik GmbHPaul-Lincke-Ufer 34D-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.de

14.0 mm27.0 mm21.6 mm

Specifications 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 ather 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

SOPHISTICATED TOOLS FOR SIGNAL RECOVERYPage 3