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This Quadruple Differential Line Driver module provides four independent differential output channels for driving balanced transmission lines in industrial and embedded applications. Built around the Texas Instruments AM26LS31 IC in a DIP-16 package, the module meets TIA/EIA-422-B and ITU standards. It delivers high-current 3-state outputs capable of driving twisted-pair or parallel-wire transmission paths. In my next project, I will show you how to build the complementary four-channel RS-422 differential line receiver.
This Quadruple Differential Line Driver module provides four independent differential output channels for driving balanced transmission lines in industrial and embedded applications. Built around the Texas Instruments AM26LS31 IC in a DIP-16 package, the module meets TIA/EIA-422-B and ITU standards. It delivers high-current 3-state outputs capable of driving twisted-pair or parallel-wire transmission paths. In my next project, I will show you how to build the complementary four-channel RS-422 differential line receiver.
An onboard LM7805C regulator accepts 7–18V DC input and supplies a stable 5V rail to the driver IC. The assembled module is shown in Figure 1.
All four driver channels share a common enable circuit with both active-high (G) and active-low (!G) enable inputs, brought out to solder jumpers on the back of the PCB. This flexibility allows the module interface to communicate directly with microcontrollers or PLCs regardless of the enable polarity.
Screw terminals (5.08 mm pitch) connect the four differential output pairs to a transmission cable, while an 8-pin header provides the digital data inputs at 2.54 mm pitch for easy breadboard or jumper-wire connection.
When power is removed, the 3-state output stage automatically places all outputs in a high-impedance condition, preventing bus loading in multi-drop configurations. The module targets applications including industrial encoder interfaces, fieldbus sensor transmitters, Modbus temperature controllers, and motor control systems where data integrity over cable runs is critical.
This design is for a quadruple differential line receiver designed for balanced or unbalanced digital data transmission over RS-422 and RS-485 links. It accepts four independent differential input pairs and converts them to single-ended digital outputs suitable for direct connection to a microcontroller or bus-organized system. It also complements our previous project, a four-channel RS-422 differential line driver.
The fully assembled board is shown in Figure 1. All four receivers share a common enable function with both active-high and active-low control inputs, and the 3-state outputs allow safe multi-device bus sharing.
Module is a dual 12-bit PWM-to-voltage output DAC with high accuracy. The board is based on the LTC2644 chip. The LTC2644 measures the period and pulse width of the PWM input signals and updates the voltage output DACs after each corresponding PWM input rising edge. The DAC outputs update and settle to 12-bit accuracy within 8μs typically and are capable of sourcing and sinking up to 5mA (3V) or 10mA (5V), eliminating voltage ripple and replacing slow analog filters and buffer amplifiers. The circuit has a full-scale output of 2.5V using the 10ppm/°C internal reference. It can operate with an external reference, which sets the full-scale output equal to the external reference voltage. Each DAC enters a pin-selectable idle state when the PWM input is held unchanged for more than 60ms. The project operates from a single 2.7V to 5.5V supply and supports PWM input voltages from 1.71V to 5.5V. The PWM frequency can be any frequency between 30Hz and 6. 25kHz. The input level can be between 1.71V and 5.5V, set by a separate IOVCC pin. This project solves many problems associated with filtering a PWM signal to produce an analog voltage, producing a fast-settling, accurate analog voltage in response to a digital PWM input.
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The LT1079 draws very little supply current while still delivering low offset voltage and low noise. This makes the module well-suited to battery-powered instrumentation and sensor front-ends where both precision and low power draw matter.
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This is a low-cost video distribution amplifier capable of driving up to four video lines. The amplifier is configured with a non-inverting gain of 2. The input video source is terminated in 75 Ohms and is applied to the high impedance non-inverting input. Each output line is connected to the op-amp’s output via 75 Ohms series back termination resistor for proper cable termination. The termination resistor at the other end of the lines divides the output signal by 2, which is compensated by the gain of 2 of the op-amp. The project is built using AD8010 op-amp which is optimized for this specific function of providing excellent video performance in driving multiple video loads in parallel. Significant power is saved and heat sinking is greatly simplified because of the ability of the AD8010 to obtain this performance when running on ±5 V supply. Circuit provides 46dB of output-to-output isolation at 5Mhz driving back terminated 75 Ohms cable. Ferrite beads and high-value ceramic capacitors are used on the power supply input to reduce the noise.
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