Datasheet

DLPVA-100-BLN-S
Low Noise Variable Gain
Low Frequency Voltage Amplifier

Features

Applications

Variable Gain 40 to 100 dB, Switchable in 20 dB Steps
Bipolar Input Stage, Recommended for Low Impedance Sources
Smaller than 100 Ω
Very Low Input Voltage Noise: 700 pV/√√Hz
DC-Coupled, Single Ended
0.5 µV/°C DC-Drift
Bandwidth DC - 100 kHz, Switchable to 1 kHz
Switchable AC/DC-Coupling
Local and Remote Control

Low-Noise Laboratory Amplifier
Pulsed Thermal EMF Analysis
Industrial Sensors
Detector PreamplifierIntegrated Measurement Systems

Block Diagram
Low-Noise
Input Stage

INPUT

Programmable
AC / DC Coupling

Programmable
Gain Amplifier

0 dB
20 dB

40 dB

Programmable
Gain Amplifier

Programmable
Lowpass-Filter
f-3dB = 1/100 kHz

0 dB
40 dB

OUTPUTPOWER
SUPPLY

Parameter Control Unit
SupplyVoltage
Regulator
IN (+/-15V)
Optocoupler
Isolate Unit

ManualSwitch

OFFSET ADJUSTINPUT / TRIMMER

DIG. CONTROLINPUTSOUT (+/-12V, +5V)

POWER SUPPLYOUTPUT
BS01-0440-19

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Datasheet

DLPVA-100-BLN-S
Low Noise Variable Gain
Low Frequency Voltage Amplifier
Test Conditions

Vs = ± 15 V, Ta = 25°C

Gain Values

Gain Flatness

40, 60, 80, 100 dB
indicated by four LEDs
± 0.1 %
(between settings)±1%(overall)± 0.1 dB

Frequency Response

Lower Cut-Off Frequency
Upper Cut-Off Frequency
Upper Cut-Off Frequency Rolloff

DC, switchable to 1.5 Hz
100 kHz, switchable to 1 kHz
12 dB/Oct.

Time Response

Rise / Fall Time (10% - 90%)

3.5 µs (@ BW = 100 kHz)
350 µs (@ BW = 1 kHz)Input

Input Impedance
Input Voltage Drift1 MΩ
0.5 µV/°C

Equivalent Input Voltage Noise

Gain Setting
100 dB
80 dB
60 dB
40 dB

Equivalent Input Current Noise
1/f-Noise Corner
Input Bias Current
Input Bias Current Drift
Input Offset Voltage

3 pA/√Hz80 Hz
1 µA
8 nA/°C± 500 µV, adjustable by offset trimmer andexternal control voltage

Output Impedance
Output Voltage Range
For Linear Amplification
Output Current (max.)
Output Overload Recovery Time50 Ω (terminate with > 10 kΩ for best performance)

Specifications
Gain

Gain Accuracy

OutputOverload LEDNoise700 pV/√Hz730 pV/√Hz860 pV/√Hz6 nV/√Hz± 10 V (@ > 10 kΩ load)± 20 mA
0.5 ms (after 20x overload)

The amplifier features a LED to signalize an overload condition. The Overload LED will turn on
if the signal level within the signal path exceeds the linear operating range. In order to ensure
the correct operation of the amplifier without signal distortions reduce the gain setting until
the Overload LED turns off.
The Overload LED may also turn on when the amplifier is operated with open input or with ahigh source impedance. For proper operation please use a source impedance of less than
1 kΩ or switch to a lower gain setting.

Remote Offset Control

Offset Control Voltage Range
Offset Control Input Impedance± 10 V, corresponds to ± 500 µV input offset
200 kΩ

Remote Digital Control

Control Input Voltage Range

Low: - 0.8 ...+ 0.8 V
High: + 1.8 ... + 12 V, TTL / CMOS compatible
0 mA @ 0 V, 1.5 mA @ + 5 V, 4.5 mA @ + 12 V
Non active: + 5 V, max. 1 mA, active: 0.8 V, max. -10 mA

Control Input CurrentOverload Output
Power Supply

Supply Voltage
Supply Current± 15 V (± 14.5 V to ± 16 V)± 75 mA typ. (depends on operating conditions,recommended power supply capability minimum 200 mA)

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Datasheet

DLPVA-100-BLN-S
Low Noise Variable Gain
Low Frequency Voltage Amplifier

Case

WeightMaterial

0.32 kg (0.7 lbs)
AlMg4.5Mn, nickel-plated

Temperature Range

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

Absolute Maximum Ratings

Power Supply VoltageControl Input Voltage
Signal Input Voltage± 21 V+ 16 V / - 5 V± 4.5 V

Overvoltage at the signal input can severely degrade the noise performanceor destroy the amplifier!
Connectors

Input
Output

BNC
BNC

Power Supply

LEMO series 1S, 3-pin fixed socket
Pin 1:+ 15V
Pin 2:- 15V
Pin 3:
GND

Control Port

Sub-D 25-pin, female, qual. class 2
Pin 1:+12 V (stabilized power supply output,max. 100 mA)
Pin 2:-12 V (stabilized power supply output,max. 100 mA)
Pin 3:
AGND (analog ground)Pin 4:+5 V (stabilized power supply output,max. 50 mA)
Pin 5:
digital output: overload
Pin 6:NC
Pin 7:NC
Pin 8:
offset control voltage input
Pin 9:
DGND (ground f. digital control Pin 10 - 25)
Pin 10:NC
Pin 11:
digital control input: gain, LSB
Pin 12:
digital control input: gain, MSB
Pin 13:
digital control input: AC/DC
Pin 14:
digital control input: 100 kHz / 1 kHz
Pin 15 - 25: NC

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Datasheet

DLPVA-100-BLN-S
Low Noise Variable Gain
Low Frequency Voltage Amplifier

Remote Control Operation

Typical Performance
Characteristics

GeneralRemote control input bits are opto-isolated and connectedby logical OR to local switch setting. For remote controla switch setting, set the corresponding local switch to“0 dB”, “AC” and “1 kHz” and select the wanted setting
via a bit-code at the corresponding digital inputs.
Mixed operation, e.g. local gain setting and remotecontrolled bandwidth setting, is also possible.

Gain Setting

GainPin 11Pin 1240 dB
low
low60 dBhighlow80 dB
lowhigh
100 dBhighhigh

AC/DC Setting

CouplingPin 13
AClowDChigh

Bandwidth Setting

BandwidthPin 141 kHz
low100 kHz
highFrequency Response (Logarithmic)

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Datasheet

DLPVA-100-BLN-S
Low Noise Variable Gain
Low Frequency Voltage Amplifier

Dimensions

157 mm
150 mm

OUT

18 mm

20 mm

44 mm

IN

31 mm

51 mm

15 mm

137 mm

POWER∅ 3.3 mm

51 mm
79 mm
86 mm

27 mm

14 mm

19 mm

107 mm

DZ01-0440-18

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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