ISL84762IR

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The ISL84762IR device from Intersil Corporation is an analog multiplexer/demultiplexer that is designed to switch any of 4 channels combined differential or 8 single ended channels between two analog bus terminals with an off isolation of more than 120 dB. It is designed to switch low-frequency analog signals with a wide frequency range up to the Nyquist frequency of the mixer or a higher frequency, such as 100 MHz. The device is suitable for use in medical imaging, ultrasound, scientific, or instrumentation applications.

The ISL84762IR’s multiplexing functions allow the signals at either of the two bus terminals to be selectively connected to any of the 8 single-ended or 4 differential input channels. When there is no control input applied, the output from the 8 channels is determined by the state of the TTL control inputs. The device will switch signals from -10V to +10V with low distortion.

The ISL84762IR is constructed with a monolithic CMOS process that integrates two 4-channel multiplexers and two 4-input control lines into a single-package device. The CMOS processes provide low-noise, low-power, low-distortion characteristics. The device can operate from a power supply voltage ranging from 2.5V to 3.6V and can handle full-load dynamic range without input current limiting.

The ISL84762IR allows for multiplexing of both analog and digital signals with a low on-resistance of typically 10Ω and low power consumption of only 30 mW in typical applications. The device also features a fast settling time with a termination resistance of about 33 ohms.

The ISL84762IR’s versatile product features make this device an ideal choice for applications in industrial, automotive, medical, and wireless communication systems. In communications systems, the device can be used in data converters such as sigma-delta converters, pulse density modulators, and switched capacitor filter banks. In addition, the device is also a great choice for use in high-performance A/D or D/A signal paths where low signal loss and fast switching times are a must.

The working principle of the ISL84762IR is fairly straightforward. It operates by selectively switching either 4 differential or 8 single-ended input channels between two signal paths (analog and digital). This selection is determined by the state of the control pins on the device. When no control signal is applied, the channel selection is determined by the external control pin values. The actual signal activity is controlled by the external logic supply voltage (VCCLO). The device will include an induce-off latch circuit, which allows the device to power-down and stay in the off-state regardless of the logic inputs and power supply voltage.

In summary, the ISL84762IR is a low-noise, low-power, low-distortion analog multiplexer/demultiplexer designed to switch analog and digital signals between two signal paths. The device is designed to handle a wide range of signal frequencies up to the Nyquist frequency or higher and is suitable for use in industrial, automotive, medical, and wireless communication systems. The device is constructed with a monolithic CMOS process and offers a low on-resistance, low power consumption and a fast settling time with a termination resistance of 33 ohms.

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