ST75C176CDR

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The ST75C176CDR is an quad differential line driver IC which interfaces communication and signal processing circuits to multiple isolated transmission lines. It is made to meet the most stringent electrical parameters required for communication interfaces. Notably, the ST75C176CDR provides true differential outputs, adjustable output impedance, and output voltage swing up to 18 V, which are all necessary properties that are required for long-distance transmission.

The ST75C176CDR is used in a variety of different applications, including general-purpose communication interface circuits, serial data ports, communication interface adaptors, multi-drop line drivers, data transmission systems and fiber-optic Multiplexers.

The ST75C176CDR is also used in application-specific circuits, such as aircraft systems, home and business telephone systems, professional audio systems, and mobile radio base-stations. The ST75C176CDR’s combination of features makes it applicable in many systems that otherwise would require a separate line driver IC and signal handler IC.

Specifications of the ST75C176CDR include an adjustable power supply voltage from 4.5 to 18 V. Conduction immunity is 7.5kV, the signal-ground isolation is suitable for aviation equipment (500V DC minimum). The device also has full featured differential inputs, as well as low distortion output stage.

The ST75C176CDR’s working principle is based upon the same principles shared by all differential line driver ICs. The IC has two inputs A and B, and two outputs ZA and ZB. When either A or B, or both inputs, receive some signal, these signals are converted into the corresponding output at ZA and ZB. When no signal is received at the inputs, then there is no output at the outputs.

The quiescent output is set by a few on-chip resistors, two of which are adjustable, allowing the outputs to be configured to match the differential line impedance desired by the system. If no adjustment is made to the output impedance, then the device will be configured in a low-impedance mode.

The operating frequency range for the ST75C176CDR goes from 200kHz up to about 150MHz. To avoid unwanted noise, a few pins can be strapped to provide a return path for EMI radiations. These are the RFI pins, including pin 7 and 8.

The ST75C176CDR features an integrated protection circuit, and is built with integrated MOSFETs to protect the inputs and outputs against over-voltage and reverse polarity electrostatic discharges. All input pins are protected against over voltage and reverse polarity, while each output has separate circuitry for protection.

The connection of the ST75C176CDR to a system is quite easy. The integrated set of resistors on the IC transmit differential line signals and provide bias circuitry. The supply voltage can be adjusted with a single resistor, thus creating a corresponding output voltage. Discrete wires can be used for connection and grounding, or the appropriate differential line cable.

In summary, the ST75C176CDR is a high-performance differential line driver IC suitable for wide range of applications. The device provides adjustable power supply voltage and adjustable output impedance, which enables a wide range of applications. The device’s integrated protection circuit, as well as built-in MOSFETs, further boosts the IC’s robustness and suitability for harsh environment applications.

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