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| QA 605 Low Noise Preamplifier Rev. 1.1 Shortform Datasheet Features: * Low Noise Preamplifier * For 200...5k Source Impedance Range * Low 1/f Corner Frequency * Low Quiescent Current * High Speed * No External Components Required * Hermetically Sealed Metal Package (DIL-14) Applications: Sonar, Instrumentation, Sensor Frontend Circuit Description: Low noise monolithic circuits generally have quite high current noise densities, rendering them unsuitable for source impedances (real value) of over 250, not to mention impedances of 1k or higher. Bias current of the input differential pair in a low noise amplifier has to be relatively high to reduce input noise voltage density. In the case of a bipolar input stage, this would cause the input bias current to rise beyond acceptable levels. Therefore designers often provided the input stage with current sources - which make the input current noise density even worse and may cause instabilities for higher source impedances. This hybrid design shows none of the above mentioned drawbacks: Current noise density is low even with excellent voltage noise density, the amplifier has low input bias current and will not become unstable for high source impedances. The circuit topology is internally differential, but with single ended input and output. There are generally no external components required to run the amplifier, supply bypass capacitors are integrated. However, if you intend to run the amplifier with high output load, additional bypass capacitors (tantalum) are recommended. The amplifier fits into DIL-14 sockets and features a hermetically closed (welded) metal package which provides RFI-protection and high reliability even under difficult environmental conditons. The amplifier is recommended for ultrasonic signal conditioning, especially for transducer impedances in the 1k range and frequencies up to 1.5MHz. By its outstanding DC input characteristics the amplifier also qualifies for low noise instrumentation or sensor applications. Production to MIL-Standards (MIL-PRF-38534 / MIL-STD 883C/D/E ) available on request. 1 Quintenz Hybridtechnik * www.quintenz.de * Fax 0049-89-759 25 45 copyright Quintenz Hybridtechnik 2004 QA 605 Low Noise Preamplifier Absolute Maximum Ratings: TA=20C unless otherwise noted, TC=case temperature Max. Supply Voltage Max. Continuous Output Current Max. Continuous Power Dissipation Max. Input Voltage Range Operating Temperature Range Storage Temperature Range 18V 55mA 800 mW VEE+1VVINVCC-1V -55C...+125C -65C...+150C Rev. 1.1 Technical Data: TC=20C, Operating Voltage VB=15V, Gain=100 if not stated otherwise. min/max with respect to absolute values. Negative signed current means current flowing from the hybrid. Parameter Test Conditions min. typ. max. Power Supply Supply Voltage 5V Quiescent Current (user selectable) Output Output Current 25mA Output Current continuous (all load conditions) operation Output Current Short Circuit 40mA Output Swing 500 load 13V Output Resistance DC Output Resistance DC 49.5 R Version Input Input Current VIN=0V Offset Voltage VOUT=0V Input Noise Voltage f=100kHz Density Input Noise Current 1) Density f=100kHz 1/f Corner Frequency 1) Volt./Curr. N. AC Operation Gain Range 26dB Gain Accuracy f=100Hz GBWP RL=100 Slew Rate 80V/s 1) Guaranteed by design, not measured in production test. 15V 10mA 15mA 30mA 20mA 50 150nA 150V 1.2nV/Hz 0.7pA/Hz 1 50.5 250nA 300V 1.5nV/Hz 0.9pA/Hz 10Hz 60dB 0.05dB 1.2GHz 850MHz The gain has to be selected when placing the order with Quintenz Hybridtechnik. We can help you to optimize your system by choosing the proper bias current, trading noise power density versus speed or power consumption. The amplifier is also available with 50 output resistance or decoupling capacitor at the input. Please contact us for the latest preamplifier products or customer specific amplifiers! 2 Quintenz Hybridtechnik * www.quintenz.de * Fax 0049-89-759 25 45 copyright Quintenz Hybridtechnik 2004 |
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