Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Hydrophone Preamplifier With Programmable Gain

BII-1090 Series    Hydrophone Preamplifier With Programmable Gain

BII-1090 series preamplifier are designed with programmable receiving gains for uses in echo sounding, communication, object detection, distance measurement, fishery sounder, etc... and are invaluable in these SONAR systems that must sense a variety of sources with varying signal levels.

Gain-selection signals in BII-1090 series is Digital Signals (TTL/CMOS level) or manual setup, which provide flexible solutions for your acoustic receiving system. The digital gain selection signals (TTL/CMOS level compatible) are for easy wiring to digital outputs of the DAQ of a computer or microcontroller, and the gain can also be set up manually with connecting/disconnecting gain selection wires.

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  
Low Noise Hydrophone/Receiver
Tracking and Positioning of Beacon/Pinger/Tag/Locator...
Programmable Gain to Avoid Saturation/Overload
Passive Acoustic Monitoring (PAM System)
Instrumentation of Oceanic Noise Detection and Analysis
Direction-finding Sonar, Echo-ranging
Bioacoustic Research
Low Noise, Wide Bandwidth
60 dB Gain Range
Long Cable Drive Capability
Gain Selection Digitally & Manually
CMOS/TTL, Power Supply Rail Compatible
Low Power Consumption
Related Products      
BII-2000 AGC (Automatic Gain Control) Amplifier BII-1030 Variable Gain Amplifier Hydrophone Underwater Transducer


How to calculate self-noise voltage level of BII-1090 series:
Output Self-Noise Voltage Level = Gain * square root[∫(Total Input Noise Density*Total Input Noise Density)df].  f: frequency in Hz.
Bandwidth of the BII-1090 series should be limited around the frequency range of the interest to reduce the output noise level.
How to extend gain range and bandwidth?
Two preamplifiers can be cascaded or in series to extend gain range and bandwidth. For example, two BII-1092s are cascaded to achieve gain of 0/20/40/60/80dB with -3dB bandwidth of 1MHz.
Rectangular PCB LxWxH = Length x Width x Height.  Round PCB ΦDxH = Diameter x Height.
HPF-Customized High Pass Filter; BPF-Customized Band Pass Filter. RTI-Referred to Input. SE-Single Ended. DF-Differential.

Preamplifier Bandwidth
Quiescent Current Size:mm
BII-1091 0dB: 1Hz to 250kHz
20dB: 1Hz to 250kHz
40dB: 1Hz to 250kHz
HPF 20nV/√Hz
SE 44 MΩ +9 to
3mA LxWxH
BII-1092 0dB: 1Hz to 1MHz
20dB: 1Hz to 1MHz
40dB: 1Hz to 1MHz
60dB: 1Hz to 400kHz
BPF 12nV/√Hz
SE 2 MΩ +8.2 to
10mA LxWxH
BII-1095 20dB: 1Hz to 1MHz
40dB: 1Hz to 1MHz
60dB: 1Hz to 1MHz
80dB: 1Hz to 400kHz
BPF 5.2nV/√Hz
SE 44 MΩ +8.2 to
20mA LxWxH
BII-1098 0dB: 1Hz to 4MHz
20dB: 1Hz to 4MHz
40dB: 1Hz to 4MHz
60dB: 1Hz to 1.1MHz
BPF 5.2nV/√Hz
SE 44 MΩ +7 to
17.5mA LxWxH
BII-1099 0dB: 1Hz to 4MHz
20dB: 1Hz to 4MHz
40dB: 1Hz to 4MHz
60dB: 1Hz to 1.1MHz
BPF 5.2nV/√Hz
SE 44 MΩ +7 to
17.5mA ΦDxH
Miscellaneous: BII-1090 Series
Gain Selection Table
Digital A1 Digital A0 BII-1091 Gain BII-1092 Gain BII-1095 Gain BII-1098 Gain BII-1099 Gain
0 0 0 dB 0 dB 20 dB 0 dB 0 dB
0 1 20 dB 20 dB 40 dB 20 dB 20 dB
1 0 40 dB 40 dB 60 dB 40 dB 40 dB
1 1 N/A 60 dB 80 dB 60 dB 60 dB
Vcc:  Power Supply Voltage; COM: Power Supply Common
Digital output, switch, relay, optocoupler etc. can be used for gain selection and the voltage protection rating of these devices must be greater than power supply voltage level.
Gain Selection Cable: Wires, A1, A0 and Digital Common.
Gain: See Gain Selection Table above.
Gain Selection: BII-1091 ONLY: Manually
Other BII-1090 Series Preamplifiers: Digitally and Manually
Gain Selection Voltage: BII-1091 ONLY: Not CMOS/TTL Compatible
Logic Low 0: Gain Selection Wire Open; Logic High 1: Gain Selection Wire to Vcc.
Other BII-1090 Series Preamplifiers: CMOS/TTL Compatible
Logic Low 0: Gain Selection Wire to COM or 0 to +0.8VDC;
Logic High 1: Gain Selection Wire Open or +2.4 to Vcc.
Input Type: Differential (either single ended or differential input signals are accepted).
Maximum Input: 2.4Vpp or (Maximum Output)/Gain, whichever is less.
Output Impedance:  10 Ω or 50 Ω
Maximum Output: (Supply Voltage - 6) Vpp
Driving Cable: BII-1091: 30m@250kHz; Other BII-1090 Series Preamplifiers: 200m.
Suggested DC Supply: +9VDC Battery, 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 (Potted Unit): ΦDxL: 48x15mm
Wiring: Coated PCB: 3cm wires; Potted Unit: 0.15m Cables/Wires.
Operating Temperature: -40°C to 85°C
Storage Temperature: -50°C to 105°C
BII-1090 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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