Datasheet

LCA-1K-5G
Ultra-Low-Noise Current Amplifier

Featuresyyyy

Bandwidth and Frequency Response Independent ofDetector-Capacitance (up to 10 nF)
Extremely Low Noise, 3 fA/√Hz Equivalent Input Noise Current
Bandwidth DC ... 1 kHz
9Transimpedance (Gain) 5 x 10 V/AApplications

yyyyy

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

Transimpedance
Accuracy

5 x 10 V/A (>10 kΩ Load)± 1%

Frequency Response

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

DC1 kHz (- 3 dB)
400 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

3 fA/√Hz (@ 300 Hz)
8 nV/√Hz (@ 300 Hz)
2 pA typ.
Factor 2.3 / 10 K
± 600 pA, Adjustable by Offset-Trimpot± 2 nA (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± 45 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

9SOPHISTICATED TOOLS FOR SIGNAL RECOVERY
LCA-1K-5G/SP/R6/15APR09/ Page 1 of 3

Datasheet

LCA-1K-5G
Ultra-Low-Noise Current Amplifier

Absolute Maximum Ratings

Input Voltage
Power Supply Voltage±7V± 22 VConnectors

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 3GND

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 nve rter

I/U

A Z0 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.
+ B IA S
VO LTAG E
U se ad ditio na l
Bypa ss C ap acitor
clo se to th e D etec to r(~ 10 0 n F, C e ra m ic)

LCA

CURRENTIN P U T

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

I/U

A Z0 1 -0 1 0 1 -2 0

SOPHISTICATED TOOLS FOR SIGNAL RECOVERYPage 2

Datasheet

LCA-1K-5G
Ultra-Low-Noise Current Amplifier

Dimensions

94.0 mm15.0 mm87.0 mm74.0 mmLCAOUT
51.0 mm

11.8 mm

44.0 mmINPOWER∅ 3.3 mm

DZ01-0101-21

FEMTO Messtechnik GmbHKlosterstr. 64
D-10179 Berlin x Germany
Tel.: +49-(0)30-280 4711-0
Fax: +49-(0)30-280 4711-11
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

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