Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Low Noise Wide Bandwidth Preamplifier

BII-1080 Series Low Noise Wide Bandwidth Preamplifier

BII-1080 is designed to amplify weak signals resulting from the propagation loss (spreading and attenuation loss): Sub-bottom Profiler, Seafloor Mapping System, Multibeam Imaging Sonar, Sidescan Sonar, Echosounder, Underwater Velocimeter, Doppler Sonar (Acoustic Doppler Current Profiler), etc...

How to choose -3dB cut-off frequency of high pass filter in BII-1080
When BII-1080 is used in active Sonar system, its cut-off frequency shall match the bandwidth of known Sonar signals as close as possible. With appropriate high pass filter, BII-1080 can attenuate the low frequency noises in ocean.

Technical notes
The cable has adverse effects on the signal quality in high frequency range. The longer the cable is, the worse the adverse effects is. If you use long cable in your project, you may specify customized output impedance of BII's preamplifiers to match cable impedance and the DAQ input impedance, for example, customized 50 ohms output impedance of BII preamplifier for 50 ohms RG58 coax of DAQ system.

Suggested Application   Features  Related Products 
Seafloor-mapping Sonar, Acoustic Imaging
Sub-bottom Investigation/Sediment Profiler
Navigation Sonar, Sonobuoy
Target Strength Testing
High Speed Communication
Ultrasonic Instrumentation, Sonic Cavitation Noise

20dB to 80dB Gain
Low Noise
Broadband signal detection
Drive long cable
Custom high pass filter
Built-in protection circuit

Underwater Transducer
Hydrophone

 Specification

Wideband Preamplifier: BII-1081 BII-1082 BII-1083 BII-1086
Gain: 26 dB 40 dB 60 dB 40dB and 80 dB
-3dB Bandwidth: 1. 1Hz to 1.0MHz
2. Custom
1. 1Hz to 2.0MHz
2. Custom
1. 1Hz to 1MHz
2. Custom
1. 100kHz to 5MHz
2. Custom
Input Referred Noise: 5.2 (nV/√Hz)@1KHz
3.1 (fA/√Hz)
5.2 (nV/√Hz)@1KHz
3.1 (fA/√Hz)
5.2 (nV/√Hz)@1KHz
3.1 (fA/√Hz)
≤ 1.64 (nV/√Hz)
Contact BII for details
Input Impedance: 44MΩ 44MΩ 44MΩ 20kΩ
Output Channel: One One One Two (40dB and 80 dB gain)
Miscellaneous: BII-1080 Series Preamplifier
Technical Document: Click Noise Density and Wiring.
Input Type: Differential (either single ended or differential input signals are accepted).
Input Wiring: Coated PCB: 3cm wires; Potted Unit: 0.15m Cables/Wires.
Filter: Customized Built-in Bandpass Filter. Specify -3dB cut-off frequencies when ordering.
Maximum Input: 2Vpp or (Maximum Output)/Gain, whichever is less.
Output Type: Single-ended
Output Wiring: Coated PCB: 3cm wires; Potted Unit: 0.15m Cables/Wires.
Output Impedance: 1. Default: 5 Ω
2. Customized: 50 Ω
Maximum Output: (Supply Voltage - 4) Vpp
Cable Driving Capability: 200m cable
Supply Voltage: +7.5 to +30 VDC
Current (Quiescent): 12 mA
Suggested DC Supply: +9VDC Batteries, Marine Battery, Automobile Battery, Fixed DC Linear Power Supply, Not Included.
DO NOT use variable power supply whose maximum supply voltage is higher than the above rated voltage.
DO NOT use switching mode DC power supply.
Size: Coated PCB LxWxH = 33x10x5mm
Potted Unit: ΦDxL = 48x15mm
Operating Temperature: -40°C to 85°C
Storage Temperature: -50°C to 105°C
Weight:  Coated PCB: 5gram; Potted Unit: 28.0gram.
BII-1080 Series Wiring: Click Wiring of PCB and Potted Preamplifier
DAQ Wiring: Click DAQ Wiring for detailed wiring information to data acquisition devices.

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