OPA607 datasheet(29/48 Pages) TI

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9.2.5 Ultrasonic Flow Meters

OPA607

Figure 9-15. High-Gain Ultrasonic Front-End

9.2.5.1 Design Requirements

The OPAx607 devices have a wide operating voltage range of 2.2 V to 5.5 V with a maximum quiescent current

of 1 mA. The availability of the inbuilt shutdown function enables designers to power cycle the front-end signal

chain, reducing the net quiescent current even further. The minimum operating voltage range of 2.2 V proves to

be very suitable for battery-powered and power sensitive applications such as the ultrasonic-based flow meters.

The high GBW of the OPAx607 devices enable the gain stages and the ADC drive stages to be designed

and combined, thereby reducing component count. A schematic similar to that of Figure 9-12 can be used in

ultrasonic flow meters for the front-end signal chain.

The Ultrasonic sensing subsystem reference design for gas flow measurement design guide has a detailed

design procedure for ultrasonic-based sensing for gas flow measurement. The OPAx607 devices are very

suitable op amps for the discrete front-end design described in this design guide.

10 Power Supply Recommendations

The OPAx607 devices are specified for operation from 2.2 V to 5.5 V (±1.1 V to ±2.75 V), applicable from –40°C

to +125°C. Place 0.1-µF bypass capacitors close to the power-supply pins to reduce errors coupling in from

noisy or high-impedance power supplies.

CAUTION

Supply voltages larger than 6 V can permanently damage the device (see Section 7.1).

For more detailed information on bypass capacitor placement, see Section 11.1.

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OPA607, OPA2607

SBOS981J – OCTOBER 2019 – REVISED APRIL 2021

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OPA607 Datenblatt(PDF) 29 Page - Texas Instruments