ROHM (headquartered in Kyoto, Japan) has developed an operational amplifier "BD5291G / BD5291FVE" suitable for signal amplification applications of motion sensors such as acceleration (shock), angular velocity, and pressure.
In recent years, sensors that detect information such as acceleration and angular velocity are widely used in many applications including smartphones, tablets, and portable game consoles. The sensor is an element that converts various physical changes generated by the application into signals. In order to use the small signals output, these signals must be amplified. The amplifier for the sensor is arranged behind the sensor and is used to amplify the signal. However, when it is necessary to amplify a small signal with high precision, fine analog technology is required.
This product utilizes the simulation technology that ROHM is good at, under 1.7V low voltage operating conditions, not only achieves full input and output amplitude, but also handles small signals by about 18 times higher accuracy than previous products, achieving higher accuracy (high Common mode signal rejection ratio).
The BD5291G has been selling samples in August 2013 (the sample price is 50 yen), and plans to start mass production with a monthly output of 500,000 units in November 2013. The production base for the early stage process is ROHM Hamamatsu Co., Ltd. (Hamatsu City, Japan), and the production base for the later stage process is ROHM Electronics Philippines Inc. (Philippines). The smaller package BD5291FVE plans to start selling samples in December 2013 (sample price is 50 yen), and in March 2014, it will temporarily put into mass production at a scale of 500,000 units per month. The production base of the previous process is ROHM Wako Co. , Ltd. (Okayama Prefecture, Japan), the production base for the later process is ROHM Integrated Systems (Thailand) Co., Ltd. (Thailand).
Features
1. Both low voltage operation and full input amplitude
Guaranteed 1.7V low power supply voltage operation, while achieving full amplitude input and output, it is most suitable for many applications that require low voltage operation.
2. High-precision signal amplification
Significantly reduce the amount of change in bias voltage generated in the differential input section, thus achieving a common-mode signal rejection ratio of up to 70dB (Min). It can amplify small signals such as sensors with higher accuracy.
New product details
This product also achieves low-voltage operation, full input-output amplitude, and high common-mode signal rejection ratio, which are often difficult to achieve. It is very helpful for the application of small signals such as sensor output signals to achieve high accuracy. In addition, general operational amplifier applications such as microphone amplifiers, active filters, buffer amplifiers, and amplifier circuits can be used.
The integration of digital power supply and analog power supply has made the power supply voltage lower. The operating voltage of the conventional input-output full-amplitude operational amplifier can only guarantee more than 1.8V, and this product achieves a low voltage of 1.7V to ensure The margin for power supply voltage fluctuations. Not only that, the common mode signal rejection ratio is as high as 70dB (Min) compared to the 45dB (Min) of the previous products, and it can amplify signals with higher accuracy. (CMRR is the ratio of the change in the common-mode signal to the output voltage fluctuation, about 178 times at 45dB and about 3162 times at 70dB)
application
â— Smartphone
â— Tablet PC
â— Portable game machine
â— Portable CD / DVD player
Equipment requiring motion sensors
â— Microphone amplifier
â— Active filter
â— Buffer amplifier
â— Amplifier circuit
General operational amplifier applications
New product performance
In the future, ROHM will continue to develop a series of products that take advantage of low-voltage operation and full amplitude input and output.
ROHM input and output full amplitude CMOS operational amplifier series
Terminology
â— Input and output full amplitude
Product types that can input and output signals from the lower limit of the power supply voltage (VSS) to the upper limit of the power supply voltage (VDD).
The maximum output voltage amplitude of a general operational amplifier does not operate in a region where the upper limit (VDD) and lower limit (VSS) of the power supply voltage are about 1V to 2V. When the working power supply voltage is low, the input voltage range becomes narrow, and the output voltage cannot be sufficiently provided. Compared with this, the input voltage of the input-output full-amplitude operational amplifier can be from the upper limit (VDD) to the lower limit (VSS) of the power supply voltage, and the output voltage can reach VDD and VSS.
â— Common Mode Rejection Ratio (CMRR / Common-Mode Rejection Ratio)
In an amplifier (Amplifier), when outputting exactly the same signal (common mode signal) to two input pins, the ideal result is that the output is zero. But in fact, the bias voltage causes a certain voltage output, causing errors. The measure of the ability to remove this common-mode signal is called the common-mode signal rejection ratio (CMRR). Amplifiers with higher common-mode signal rejection are used when amplifying small signals on the common-mode voltage or when the voltage difference between the two signals is important.
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