Datasheet

DLPCA-200
Variable Gain
Low Noise Current Amplifier

311Features

Transimpedance (gain) switchable from 1 x 10 to 1 x 10 V/A
Bandwidth DC/1 Hz ... 500 kHz
Bandwidth switchable to DC ... 10 Hz for low noise DC measurements
Bandwidth independent of detector capacitance (up to 1 nF)
Adjustable bias voltage
Protection against ±3 kV transients
Local and remote control

Applications

Photodiode and photomultiplier amplifier
Scanning tunneling microscopy (STM)
Spectroscopy
Beam monitoring for particle accelerators/synchrotrons
Ionisation detectors
Preamplifier for lock-ins, A/D converters, etc.
Current toVoltage Converter

Block Diagram

Programmable
AC / DC Coupling

CURRENTINPUT

Programmable
Gain Amplifier

Buffer-Amplifier andBandwidth LimitingRf =1k ... 1G

I/V

X1X 100

OffsetNulling

Low NoiseHigh Speed

VOLTAGEOUTPUT

10Hz
FBW
Overload
Detector

Stabilized
Bias Voltage
or GND+10 V

Parameter
Control Unit

ManualSwitches

Bias Buffer

Supply Voltage
Regulator

Optocoupler
Isolate Unit

POWER
SUPPLY-10 V
DIG. CONTROLINPUTS

BS01-0141-10

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DE-DLPCA-200_R18/MN,JM/17NOV2014Page 1 of 5

Datasheet

DLPCA-200
Variable Gain
Low Noise Current Amplifier

Specifications

Test conditions

VS = ±15 V, TA = 25 °C, load impedance = 1 MΩ

GainTransimpedanceGain accuracy
Gain drift

1 x 10 ... 1 x 10 V/A±1 %see table below

Frequency Response

Lower cut-off frequency
Upper cut-off frequency (–3 dB)
Gain flatness

DC / 1 Hz
up to 500 kHz (see table below), switchable to 10 Hz±0.1 dB

Input

Equ. input noise current
Equ. input noise voltage
Input offset current drift
Input bias currentMax. input current
Input offset compensation

see table below
4 nV/√Hz (@ 1 kHz)see table below
1 pA typ. (max. 3 pA)
see table below (value for linear amplification)
adjustable by offset potentiometer and external control
voltage; max. range see table below

Performance depending
on Gain Setting

Gain setting (low noise) (V/A)

103

311104105106107108109

Upper cut-off frequency (–3 dB) 500 kHz 500 kHz 400 kHz 200 kHz 50 kHz
Rise/fall time (10 % - 90 %)700 ns 700 ns 900 ns 1.8 µs 7 µs
Input noise current density (/√Hz) 20 pA 2.3 pA 450 fA 130 fA 43 fA
measured at
10 kHz 10 kHz 10 kHz 1 kHz 1 kHz
Integr. input noise current (rms)* 21 nA 2.4 nA 500 pA 130 pA 41 pA
Offset current drift (/°C)
30 nA 3 nA
0.3 nA 30 pA 3 pA
Gain drift (/°C)
0.008% 0.008% 0.008% 0.01% 0.01%
Max. input current (±)
10 mA 1 mA 0.1 mA 10 µA 1 µA
Input offset compensation (±)
100 µA 10 µA 1 µA
0.1 µA 10 nA
DC input impedance (// 5 pF)
50 Ω 50 Ω 50 Ω 60 Ω 150 ΩGain setting (high speed) (V/A)

1051061071081097 kHz50 µs
13 fA
100 Hz5.8 pA0.3 pA
0.01%
0.1 µA
1 nA
1 kΩ
10101.1 kHz
300 µs
4.3 fA
100 Hz0.8 pA0.1 pA
0.02%
10 nA
0.1 nA
10 kΩ
1011

Upper cut-off frequency (–3 dB) 500 kHz 500 kHz 400 kHz 200 kHz 50 kHz
Rise/fall time (10 % - 90 %)700 ns 700 ns 900 ns 1.8 µs 7 µs
Input noise current density (/√Hz) 13 pA 1.8 pA 440 fA 130 fA 43 fA
measured at
10 kHz 10 kHz 10 kHz 1 kHz 1 kHz
Integr. input noise current (rms)* 12 nA 1.8 nA 450 pA 120 pA 37 pA
Offset current drift (/°C)
30 nA 3 nA
0.3 nA 30 pA 3 pA
Gain drift (/°C)
0.008% 0.008% 0.008% 0.01% 0.01%
Max. input current (±)
100 µA 10 µA 1 µA
0.1 µA 10 nA
Input offset compensation (±)
100 µA 10 µA 1 µA
0.1 µA 10 nA
DC input impedance (// 5 pF)
50 Ω 50 Ω 50 Ω 60 Ω 150 Ω

7 kHz50 µs
13 fA100 Hz
5.3 pA0.3 pA
0.01%
1 nA
1 nA
1 kΩ

1.1 kHz300 µs
4.3 fA
100 Hz0.8 pA0.1 pA
0.02%
0.1 nA0.1 nA
10 kΩ* The integrated input noise is measured with an open but shielded amplifier input in the fullbandwidth (“FBW”) setting. The input referred peak-peak noise can be calculated from the rms
noise as follows:
IPP = IRMS x 6
The output noise is given by:
UPP = IPP x gain
OutputOutput voltage
Output impedance
Max. output current±10 V (@ ≥100 kΩ load)50 Ω (terminate with ≥100 kΩ load for best performance)±30 mA

Detector Bias

Bias voltage range±10 V, max. 22 mA (bias voltage connected to shield of
BNC input socket, adjustable by potentiometer, switchable
to GND)

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Datasheet

DLPCA-200
Variable Gain
Low Noise Current Amplifier

Indicator LED

Function

overload

Digital Control

Control input voltage range
Control input current
Overload output

LOW bit: –0.8 V ... +1.2 V, HIGH bit: 2.3 V ... +12 V
0 mA @ 0 V, 1.5 mA @ +5 V, 4.5 mA @ +12 V
non active: <0.4 V @ 0 ... –1 mA
active:typ. 5 ... 5.1 V @ 0 ... 2 mA

Ext. Offset Control

Control voltage range
Offset control input impedance

±10 V
20 kΩ

Power Supply

Supply voltage
Supply current
Stabilized power supply output±15 V+120 / –80 mA typ. (depends on operating conditions,recommended power supply capability min. ±200 mA)±12 V, max. ±50 mA, +5V, max. 30 mA

CaseWeightMaterial

320 g (0.74 lb.)
AlMg4.5Mn, nickel-plated

Temperature RangeStorage temperature
Operating temperature–40 °C ... +100 °C
0 °C ... +60 °C

Absolute Maximum Ratings

Signal input voltage
Signal input current (rms)Transient input voltage
Control input voltage
Power supply voltage–16 V / +12 V
35 mA±3 kV (out of 200 pF source)–5 V / +16 V±20 V

Connectors

Input

BNC, isolated, jack (female)

Output

BNC, jack (female)

Detector bias output

shield of input BNC

Power supply

Lemo series 1S, 3-pin fixed socket(mating plug type: FFA.1S.303.CLAC52)®

Pin 1:Pin 2:Pin 3:+15V–15V
GND

PIN 2–Vs

PIN 1+VsPIN 3
GND

Control port

Sub-D 25-pin, female, qual. class 2
Pin 1:+12 V (stabilized power supply output)
Pin 2:–12 V (stabilized power supply output)
Pin 3:
AGND (analog ground)Pin 4:+5 V (stabilized power supply output)
Pin 5:
digital output: overload (referred to pin 3)
Pin 6:
signal output (connected to BNC)
Pin 7:NC
Pin 8:
input offset control voltage
Pin 9:
DGND (ground for digital control pins 10 - 14)
Pin 10:digital control input: gain, LSB
Pin 11:
digital control input: gain
Pin 12:
digital control input: gain, MSB
Pin 13:
digital control input: AC/DC
Pin 14:
digital control input: high speed / low noise
Pin 15 - 25: NC

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Datasheet

DLPCA-200
Variable Gain
Low Noise Current Amplifier

Remote Control Operation

GeneralRemote control input bits are opto-isolated and connectedby logical OR function to local switch settings. For remotecontrol set the corresponding local switches to “Remote”,“AC” and “H” (High speed) and select the wanted setting
via a bit code at the corresponding digital inputs.
Mixed operation, e.g. local gain setting and remotecontrolled AC/DC setting, is also possible.
Switch settings “FBW / 10 Hz” and “Bias / GND”
are not remote controllable.

Gain setting

Low noiseHigh speed
Pin 14=HIGH Pin 14=LOW Pin 12
Gain (V/A)
Gain (V/A)
MSB

Pin 11

Pin 10LSB
310
410
510610710810910
Gain settling time
AC/DC setting

51061071081091010101110LOWLOWLOWLOW
HIGH
HIGHHIGH

LOW
LOW
HIGH
HIGH
LOW
LOW
HIGH

LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW

<150 ms
Coupling

Pin 13

AC
DC
Application Diagram

LOW
HIGH

Photo detector biasing
DLPCA
Current toVoltage Converter
CURRENTINPUT

I/V
Stabilized
Bias Voltage+10 V

47 OhmBias buffer
with active
current limiting-10 V
AZ01-0140-1

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Datasheet

DLPCA-200
Variable Gain
Low Noise Current Amplifier

Dimensions

157 mm
150 mm

15 mm

137 mm

29 mm

22 mm

51 mm

44 mm

14 mm

OUT

12 mm

IN

POWER

Ø 3.2 mm

28 mm
42 mm
79 mm
101 mm
111 mmFEMTO Messtechnik GmbHKlosterstr. 6410179 Berlin · Germany
Phone: +49 30 280 4711-0
Fax: +49 30 280 4711-11
Email: info@femto.dewww.femto.de

28.5 mm

15 mm

43 mm

125 mmSpecifications are subject to change without notice. Information provided herein is believed to be accurate andreliable. However, no responsibility is assumed by FEMTO Messtechnik GmbH for its use, nor for any infringementof patents or other rights of third parties which may result from its use. No license is granted by implication orotherwise under any patent or patent rights of FEMTO Messtechnik GmbH. Product names mentioned may also betrademarks used here for identification purposes only.
© by FEMTO Messtechnik GmbH · Printed in Germany

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