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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
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Sensor Input

Example of gas detection circuit for measuring degree of air pollution

Circuit Description

空気汚染度測定用のガス検知回路例

For IoT sensor devices, the sensed data must be sent to the cloud with digital data of the sensing signal whether wired or wireless. Analog Digital Converter (ADC) is generally used to digital data conversion from the analog signal of the sensor output. One of the important indicators of ADC applications for accurate digital conversion is the input of an appropriate level of analog signal. Generally speaking, high-precision sensors often use delicate sensing elements and the output signal is often a minute analog signal. Therefore, in some cases, accurate digital conversion cannot be achieved even if the sensor output is directly input to the ADC. An operational amplifier is used in such cases.

An op-amp for amplifying analog signals from small level of signal sensor outputs to appropriate signal levels on the ACD inputs is required to make the noise performance of the op-amp itself extremely small in order to achieve high-precision amplification. It is also important to reduce the power consumption as much as possible in the application to IoT sensor devices. Toshiba offers a lineup of TC75S67TU, which is an optimum CMOS op amp for amplifying sensor signals in such IoT sensor devices. 

Stable power supplies are also critical to the low-noise performance of TC75S67TU. In order to make the power supply more stable, it is also recommended that the power supply for the op-amp be isolated from the power supply for other electronic circuits. The LDO-regulator's TCR3UG Series enables high-precision power supplies with low current draw. 

TC75S67TU achieves a low noise level of 6 nV/√Hz (f=1 kHz, GV=40 dB, typical) input-converted noise voltage. In addition, by adopting CMOS processing, low power dissipation is also realized at the same time.

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Package
(Width×Length×Height mm)

Product Overview

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TC75S67TU

UFV
(2.0×2.1×0.7)

Ultra Low Noise Operational Amplifier,  VNI=6nV/√Hz (Typ.) (VDD=2.5V, f=1kHz)

TCR3UG series can contribute to low power consumption of the set due to its low current consumption characteristics, and has a lineup of 0.1V steps of output voltage as standard.

Product Number

Package
(Width×Length×Height mm)

Product Overview

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TCR3UG25A

WCSP4F
(0.645×0.645×0.33)

Low quiescent current 0.34μA (Typ.) (@IOUT=0mA), VOUT=2.5V (Typ.), IOUT=300mA (Max)

TCR3UG30A

WCSP4F
(0.645×0.645×0.33)

Low quiescent current 0.34μA (Typ.) (@IOUT=0mA), VOUT=3.0V (Typ.), IOUT=300mA (Max)

TCR3UG33A

WCSP4F
(0.645×0.645×0.33)

Low quiescent current 0.34μA (Typ.) (@IOUT=0mA), VOUT=3.3V (Typ.), IOUT=300mA (Max)
TCR3UG50A

WCSP4F
(0.645×0.645×0.33)

Low quiescent current 0.34μA (Typ.) (@IOUT=0mA), VOUT=5.0V (Typ.), IOUT=300mA (Max)

Other Circuit Description

AC-DC Power Supply

Other block diagrams

AC-DC Forward Power Supply
Examples of AC-DC converter circuits using the forward method

Application / IoT Sensor

Microphone amplifier
Example of microphone circuit for voice recognition

Application / IoT Sensor

Main control section

Application / IoT Sensor

LED drive
Example of LED driving circuit for operation status display

Application / IoT Sensor

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