Differential Preamplifier ADA400A Datasheet 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 ADA400A as 5 V, even in high-noise environments. Selectable bandwidth limiting The ADA400A Differential Preamplifier allows direct oscilloscope reduces normal mode noise from digital logic, switch mode power supplies, measurements of very low amplitude voltages and signals which are not and line frequency sources. Adjustable differential offset allows the user to ground referenced. The high impedance of both inputs eliminates the need null out transducer bridge bias and galvanic potential from the test setup. to add additional ground points in the DUT, thereby avoiding circulating Aninfinite impedanc mode can be selected in the two highest gain currents which disturb the measurement or the circuit. ranges allowing accurate measurements of signals with high source impedance. Key performance specifications 10 V/div sensitivity Typically 100 dB CMRR DC to 10 kHz Key features Active differential preamplifier Integral probe power with TEKPROBE BNC www.tek.com 1Datasheet Specifications All specifications are guaranteed unless noted otherwise. All specifications apply to all models unless noted otherwise. Gain settings 100x, 10x, 1x, 0.1x CMRR 100,000: 1 DC - 10 kHz 1 Signal ranges Gain setting Common Mode signal range Differential signal range Max 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 M ~ 55 pF (infinity selectable in 100x and 10x gains) Noise Typically 30 V at 100x gain (referred to input) RMS 1 For higher voltages, attenuating probes may be used, but CMRR performance will be degraded. 2 www.tek.com