Differential Preamplifier
ADA400A Datasheet
ADA400A
The ADA400A Differential Preamplifier allows direct oscilloscope
measurements of very low amplitude voltages and signals which are not
ground referenced. The high impedance of both inputs eliminates the need
to add additional ground points in the DUT, thereby avoiding circulating
currents which disturb the measurement or the circuit.
Key performance specifications
10 μV/div sensitivity
Typically 100 dB CMRR DC to 10 kHz
Key features
Active differential preamplifier
Integral probe power with TEKPROBE™ BNC
Connectivity
The ADA400A is powered directly from TDS400, TDS500, TDS600,
TDS700, TDS5000, TDS7000 (TEKPROBE), TDS7000 (TekConnect)
w/ TCA-1MEG Series oscilloscopes.
The ADA400A may also be powered by a 1103 Probe Power Supply.
Applications
Mechanical analysis
Audio design
Biomedical research (not certified for patient connection)
Medical equipment (not certified for patient connection)
ADA400A
The high gain and extremely high common mode rejection of the ADA400A
Differential Preamplifier provide usable measurements of voltages as low as
5 μV, even in high-noise environments. Selectable bandwidth limiting
reduces normal mode noise from digital logic, switch mode power supplies,
and line frequency sources. Adjustable differential offset allows the user to
null out transducer bridge bias and galvanic potential from the test setup.
An "infinite impedance" mode can be selected in the two highest gain
ranges allowing accurate measurements of signals with high source
impedance.
Specifications
All specifications apply to all models unless noted otherwise.
Gain settings 100x, 10x, 1x, 0.1x
CMRR ≥100,000: 1 DC - 10 kHz
Signal ranges Gain setting Common Mode signal range Differential signal range 1Max offset
100x ±10 V 0.1 V ±1.0 V
10x ±10 V 1 V ±1.0 V
1x ±40 V 10 V ±40 V
0.1x ±40 V 80 V ±40 V
Bandwidth limits 100 Hz, 3 kHz, 100 kHz, full (≥1 MHz)
Input impedance 1 MΩ || ~ 55 pF (infinity Ω selectable in 100x and 10x gains)
Noise Typically ≤30 μVRMS at 100x gain (referred to input)
1For higher voltages, attenuating probes may be used, but CMRR performance will be degraded.
Datasheet
2 www.tektronix.com
Ordering information
Models
ADA400A Differential Preamplifier
Standard accessories
Instruction manual 070-9164-XX
Spare input fuses (2) 159-0024-XX
Recommended accessories
P6101B 1x passive probe 2 recommended
Options
Service options
Opt. C3 Calibration Service 3 Years
Opt. C5 Calibration Service 5 Years
Opt. D1 Calibration Data Report
Opt. D3 Calibration Data Report 3 Years (with Opt. C3)
Opt. D5 Calibration Data Report 5 Years (with Opt. C5)
Opt. R5 Repair Service 5 Years (including warranty)
Opt. SILV200 Standard warranty extended to 5 years
CE Marking Not Applicable.
Tektronix is registered to ISO 9001 and ISO 14001 by SRI Quality System Registrar.
www.tektronix.com 3
Datasheet
ASEAN / Australasia (65) 6356 3900 Austria 00800 2255 4835* Balkans, Israel, South Africa and other ISE Countries +41 52 675 3777
Belgium 00800 2255 4835* Brazil +55 (11) 3759 7627 Canada 1 800 833 9200
Central East Europe and the Baltics +41 52 675 3777 Central Europe & Greece +41 52 675 3777 Denmark +45 80 88 1401
Finland +41 52 675 3777 France 00800 2255 4835* Germany 00800 2255 4835*
Hong Kong 400 820 5835 India 000 800 650 1835 Italy 00800 2255 4835*
Japan 81 (3) 6714 3010 Luxembourg +41 52 675 3777 Mexico, Central/South America & Caribbean 52 (55) 56 04 50 90
Middle East, Asia, and North Africa +41 52 675 3777 The Netherlands 00800 2255 4835* Norway 800 16098
People's Republic of China 400 820 5835 Poland +41 52 675 3777 Portugal 80 08 12370
Republic of Korea 001 800 8255 2835 Russia & CIS +7 (495) 6647564 South Africa +41 52 675 3777
Spain 00800 2255 4835* Sweden 00800 2255 4835* Switzerland 00800 2255 4835*
Taiwan 886 (2) 2722 9622 United Kingdom & Ireland 00800 2255 4835* USA 1 800 833 9200
* European toll-free number. If not accessible, call: +41 52 675 3777 Updated 10 April 2013
For Further Information. Tektronix maintains a comprehensive, constantly expanding collection of application notes, technical briefs and other resources to help engineers working on the cutting edge of technology. Please visit www.tektronix.com.
Copyright © Tektronix, Inc. All rights reserved. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all previously published material. Specification and price
change privileges reserved. TEKTRONIX and TEK are registered trademarks of Tektronix, Inc. All other trade names referenced are the service marks, trademarks, or registered trademarks of their respective companies.
11 Apr 2013 60W-10387-5
www.tektronix.com
