Datasheet

DLPVA-100-F Series
Variable Gain
Low Frequency Voltage AmplifierFeatures


Variable Gain 20 to 80 dB, Switchable in 20 dB StepsFET Input Stage, 1 TΩ
Ω ImpedanceProtection against ± 3 kV Transients
Single Ended and True Differential Input Models
Bandwidth DC - 100 kHz, Switchable to 1 kHz
1.3 µV/°C DC-Drift
120 dB CMRR
5.5 nV/√√Hz Input Noise
Switchable AC/DC-Coupling
Local and Remote Control

Applications



Universal Laboratory Amplifier
Automated Measurements
Industrial Sensors
Detector Preamplifier
Integrated Measurement Systems
Low Noise,Low Drift
Input Stage

INPUT

Programmable
AC / DC Coupling

Programmable
Gain Amplifier

0 dB
20 dB

20 dB

Programmable
Gain Amplifier

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

0 dB
40 dB

OUTPUT

Parameter Control Unit

POWER
SUPPLYSupplyVoltage
Regulator
IN (+/-15V)
Optocoupler
Isolate Unit

ManualSwitchOFFSET ADJUSTINPUT / TRIMMER

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

POWER SUPPLYOUTPUT
BS01-0440-19

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DLPVA-100-F Series
Variable Gain
Low Frequency Voltage Amplifier
Test Conditions

Vs = ± 15 V, Ta = 25°C

Gain Values

Gain Flatness

20, 40, 60, 80 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 ImpedanceInput Voltage Drift
Equivalent Input Voltage Noise1 TΩ
1.3 µV/K
DLPVA-100-F–D
Gain Setting
DLPVA-100-F–S
60, 80 dB
5.5 nV/√Hz
6.9 nV/√Hz40 dB
8 nV/√Hz
10 nV/√Hz20 dB
60 nV/√Hz
60 nV/√Hz
1.6 fA/√Hz80 Hz
1 pA
Factor 2.3 / 10 °C± 5 mV, adjustable by offset trimmer andexternal control voltage

Specifications
Gain

Gain Accuracy

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

Single Ended Input, Model “DLPVA-100-F-S” only:
Input Voltage Range for linear Amplification:± 0.6 V
True Differential Input, Model “DLPVA-100-F-D” only:
Common Mode Voltage Range±5V
CMRR
120 dB(@ 100 Hz)
100 dB(@ 10 kHz)
80 dB(@ 60 kHz)
OutputOutput Impedance
Output Voltage Range
For Linear Amplification
Output Current (max.)
Output Overload Recovery Time50 Ω (terminate with > 10 kΩ load for best performance)± 10 V (@ > 10 kΩ load)± 20 mA
0.5 ms (after 20x overload)

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DLPVA-100-F SeriesVariable Gain
Low Frequency Voltage Amplifier

Overload LED

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 under the following operating conditions:- The amplifier is operated with open input or with a high source impedance. For proper
operation please use a source impedance of less than 100 MΩ or switch to a lower gain
setting.
- When using a DLPVA-F-D with differential input stage the Overload LED may turn on if thecommon mode input voltage exceeds ± 5 V or if the source is totally floating with respect tothe amplifier ground. For proper operation make sure that the common mode voltage stays
within ± 5 V with respect to the amplifier ground and make a valid connection between thesource ground and the amplifier ground to ensure that the inputs cannot drift outside thetolerable common mode range.

Remote Offset Control

Offset Control Voltage Range
Offset Control Input Impedance± 10 V, corresponds to ± 5 mV input offset
200 kΩ

Remote Digital ControlControl 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 Current
Overload 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 150 mA)

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 Voltage
Control Input Voltage± 21 V+ 16 V / - 5 V

Signal Input Voltage
Transient Input Voltage± 15 Vp± 3 kV (discharge from 5 nF source)

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DLPVA-100-F Series
Variable Gain
Low Frequency Voltage Amplifier

ConnectorsInput

Single Ended Input, Model “DLPVA-100-F-S”:
BNC
True Differential Input, Model “DLPVA-100-F-D”:
LEMO series 1S, 4-pin fixed socket
Pin 1:
non inverting input
Pin 2:
inverting input
Pin 3:GND
Pin 4:
N.C.

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

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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DLPVA-100-F Series
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

Gain
Pin 11Pin 12
20 dB
low
low
40 dB
high
low
60 dB
lowhigh80 dB
highhigh

AC/DC Setting

CouplingPin 13
AClowDC
highBandwidth Setting

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

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Datasheet

DLPVA-100-F Series
Variable Gain
Low Frequency Voltage Amplifier

Dimensions

157 mm
150 mm

OUT

18 mm

20 mm

44 mm

IN

51 mm

15 mm

137 mm

POWER

31 mm

∅ 3.3 mm

51 mm
79 mm
86 mm

27 mm

14 mm

19 mm

107 mm

DZ01-0440-18

Ordering Information

Available Models

Model No.: DLPVA-100-F-S- FET, singe-ended input (BNC-connector input)
Model No.: DLPVA-100-F-D- FET, true differential input (LEMO-connector input)

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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