Datasheet

DLPVA-100-BUN-S
Ultra Low Noise Variable Gain
Low Frequency Voltage Amplifier

Features

Applications

Variable Gain 40 to 100 dB, Switchable in 20 dB Steps
Bipolar Input Stage, Recommanded for Low Impedance Sources
Smaller than 50 Ω
Ultra low Input Voltage Noise: 400 pV/√
√HzAC Coupled, Single Ended
Bandwidth 1.5 Hz - 100 kHz, Switchable to 1 kHz
Local and Remote ControlUltra-Low-Noise Laboratory Amplifier
Pulsed Thermal EMF Analysis
Chopped Thermopiles / Bolometers
Industrial Sensors
Detector Preamplifier
Integrated Measurement Systems

Block Diagram
Ultra-Low-Noise
Input StageINPUT

AC 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
SupplyVoltageRegulator
IN (+/-15V)
Optocoupler
Isolate Unit

ManualSwitch

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

POWER SUPPLYOUTPUT
BS01-0445-20

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Datasheet

DLPVA-100-BUN-S
Ultra 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

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
Equivalent Input Voltage Noise1 kΩ
Gain Setting
100 dB
80 dB
60 dB
40 dB

Specifications
Gain

Gain Accuracy

Noise
400 pV/√Hz420 pV/√Hz800 pV/√Hz6 nV/√Hz

Equivalent Input Current Noise
3 pA/√Hz
1/f-Noise Corner
100 HzInput Bias Current
30 µA
Maximum Input DC-Offset Voltage
for Linear Amplification± 90 mV
Important Notice: The input must see a source Impedance below 200 Ω to function properly!
OutputOverload LED

Output Impedance
Output Voltage Rangefor linear Amplification
Output Current (max.)
Output Overload Recovery Time50 Ω (terminate with > 10 kΩ for best performance)± 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 than100 Ω or switch to a lower gain setting.

Remote Digital Control

Control Input Voltage Range
Control Input Current
Overload Output

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

Power Supply

Supply Voltage
Supply Current± 15 V (± 14.5 V to ± 16 V)± 55 mA typ. (depends on operating conditions,recommended power supply capability minimum 150 mA)

CaseWeightMaterial0.32 kg (0.7 lbs)
AlMg4.5Mn, nickel-plated

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DLPVA-100-BUN-S
Ultra Low Noise Variable Gain
Low Frequency Voltage Amplifier

Temperature Range

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

Absolute Maximum Ratings

Power Supply Voltage
Control Input Voltage
Signal Input Voltage± 21 V+ 16 V / - 5 V±4V

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

Input
Output

BNCBNCPower 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:NC
Pin 9:
DGND (ground f. digital control Pin 10 - 25)
Pin 10:
NCPin 11:
digital control input: gain, LSB
Pin 12:
digital control input: gain, MSB
Pin 13:NC
Pin 14:
digital control input: 100 kHz / 1 kHz
Pin 15 - 25: NC

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Datasheet

DLPVA-100-BUN-S
Ultra 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” 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

Gain
Pin 11Pin 12
40 dB
low
low
60 dB
high
low
80 dB
low
high
100 dBhighhigh

Bandwidth Setting

Bandwidth
Pin 14
1 kHz
low
100 kHzhigh

Frequency Response (Logarithmic)

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Datasheet

DLPVA-100-BUN-S
Ultra Low Noise Variable Gain
Low Frequency Voltage Amplifier

Dimensions

157 mm
150 mmOUT
44 mm51 mm

IN18 mm

15 mm

137 mm

POWER∅ 3.3 mm

79 mm
86 mm

27 mm

14 mm

19 mm

107 mmDZ-DLPVA-BUN-S

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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