The NJM2794 is a stereo audio isolation amplifier IC from New Japan Radi, well-suited for rejection of common-mode noise that is caused by ground potential difference between electronic devices when in-car electronics devices such as car audio are connected.
These days, car audio systems are not only music playback devices such as CD/MD tuners. They are also entertainment systems, incorporating external input devices such as CD changers and DVD or other mobile digital audio players. As a result, the demand for high-quality sound and image technology is increasing, also causing the demand for removal of common-mode noise - the noise that occurs between the main unit and external input devices - to increase.
NJR thus developed the NJM2794, a stereo isolation amp with a high common-mode rejection ratio. This IC employs two isolation amplifiers configured by four operational amplifiers, a resistance for a difference amplifier, and a reference voltage circuit. It features an over 50 dB CMRR (common mode rejection ratio), that can be achieved by high precision resistances. To achieve over 50 dB CMRR with a conventional discrete circuit, one would need high precision resistances as well as very careful design and selection of components, according to the company.
Further, by incorporating two independent isolation amps with independent circuits (called dual-mono configuration) the NJM2794 offers excellent channel separation (CS = -110 dB), and features improved noise characteristics (1,3 μV rms typ.) because all employed amplifiers have a reduced noise level.
The NJM2794 is housed in a small TVSP10 packaging (3,1 x 4,0 x 1 mm) to save space. The NJM2794 is thus a simple solution, offering high-quality performance, making it ideal for car audio external input blocks that require compact devices with a high common-mode rejection ratio. This product is also efficient when common-mode noise rejection is required between PCBs or units in digital devices, giving it numerous applications.
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