SN75146D

The SN75146D is an octal bidirectional differential line driver and receiver, designed for applications in digital systems where multiple-point data transmission is required over long lines. The SN75146D contains eight gate-drive output source type transistors and eight complementary-symmetry input buffer field-effect transistors.In addition to electrical characteristics such as low distortion, low power consumption, and high data rate, the SN75146D features low-temperature drift, which makes it particularly useful in automotive communications systems.

Working Principle

The SN75146D is a fully differential, low-voltage quad output, line driver and receiver chip. The output of this chip is composed of two driving circuits: one is a differential gate-drive circuit and the other is a complementary-symmetry input buffer circuit.The gate-drive circuit includes 8 output source type transistors and 8 output sink type transistors. Each transistor has a threshold voltage of 0.4V and a maximum output current of 2mA. Output voltage range for the gates is fixed at 7V to 13V.

The complementary-symmetry input buffer circuit consists of 8 P-channel and 8 N-channel FETs with a maximum source-drain resistance of 1.2 ohms. It accepts inputs ranging from 0V to +5V and can drive up to 10mA sinking current. The input impedance of the buffer is around 20K ohms and the maximum frequency is 1MHz.

The SN75146D features low-frequency distortion, low-power consumption and high-data transfer rate. It also has a high input impedance to minimize interference with high-frequency signals and has excellent temperature-drift performance. This makes it suitable for use in automotive communication systems.

Applications

The SN75146D is used in applications requiring multiple-point data transmission over long lines, such as in automotive communication systems, industrial control systems, computer peripheral interfaces, and GPS receivers. This chip can also be used in applications such as touch screens or relay control.

In automotive communication systems, the SN75146D is used as isolators for transforming line level signals from 0V to +5V for use in CAN bus and other communication protocols. The low-temperature drift of the chip ensures reliable operation even in extreme environments. It is also used to convert the analog signals from rotary and variable-speed switch controls into a digital signal.

The SN75146D can also be used as an isolator in industrial control systems. It is used to transmit information between PLC units over a communication bus, and to protect the system against high-voltage spikes and low-voltage drops. Its low-power and low-distortion features make it an ideal choice for data transmission over long distances.

In the computer peripheral arena, the chip is used for transferring analog signals from devices such as keyboards or mice, photoelectric sensors, and joystick controls. It is also used in GPS receivers where its low-distortion characteristics are ideal for providing accurate positioning data.

The SN75146D is a versatile and highly reliable line driver and receiver chip, capable of performing in a range of applications requiring multiple-point data transmission over long lines. It has low-distortion and low-power consumption characteristics that make it suitable for a wide variety of applications.