MAX3085CPA+

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The MAX3085CPA+ is a dual-current-mode logic (CML)-to-Complementary Metal Oxide Semiconductor (CMOS) transceiver. It is designed as a bus-transceiver suitable for a variety of applications where data signals need to be transferred between systems that process different logic levels. Offered in both low-power full-duplex (MAX3085CPA+) and single-ended half-duplex (MAX3085CPA) versions, the devices are fully specified across the extended -40°C to +125°C temperature range.

The MAX3085CPA+ is a part of the larger MAX3085CPA family of devices, which also includes the single-ended half-duplex MAX3085CSA+ variant. The MAX3085CPA+ transceiver integrates a complementary differential output stage, providing minimum undershoot and optimal logic levels at the outputs, thus allowing data to be transferred without being distorted. Its high level of system integration reduces design time, while the wide frequency range and the low-power consumption make it suitable for a variety of applications.

Applications

The broad range of application areas where the MAX3085CPA+ transceiver can be successfully used includes communication, computing and instrumentation systems. It is suitable for a variety of high-performance, data-acquisition systems, providing deterministic latency and accurate timing. Examples include peripheral interface adapters (PIAs), embedded controllers, networking systems, low-power computer and industrial control systems, video electronics and test and measurement instruments, where system power consumption needs to be minimized.

Working Principle

The MAX3085CPA+ transceiver is designed as a dual-current-mode logic (CML)-to-Complementary Metal Oxide Semiconductor (CMOS) transceiver, providing maximum output current and minimum undershoot during the transition of data. It has two separate data paths, each including a differential line receiver, a differential line driver, a CMOS line driver, and two separate logic blocks to support the low-voltage, full-duplex application.

The differential line receiver, a voltage-mode, maximum- and minimum-speed comparator, senses the incoming data from the differential line and produces bipolar threshold and drive signals. These signals enable the transceiver to achieve maximum output current for the CML and low-voltage input logic. The output is complemented by a symmetry circuit to ensure that the CMOS logic signals have a low-swing output stage that operates on the same voltage range as the CML.

The output drivers are designed for high speed and low power, providing maximum output current and minimum undershoot. The differential line drivers are specifically optimized for the CML input voltage range, while the CMOS drivers are optimized for the low-voltage, low-power logic levels. The drivers feature an adjustable gain and an adjustable output current limit setting to support a variety of applications. The devices are also designed to operate at very low power levels, making them suitable for a variety of applications where power consumption needs to be minimized.

The MAX3085CPA+ transceiver also features an on-chip self-reset feature which can be used to reset the transceiver at the power-on stage. This ensures that the device is always in a known state when powered on. The device also has a low-current Status Output (STO) pin which can be used to provide output status information. Additionally, the device has an on-board power-up reset generator which can help reduce the design complexity by resetting the CML logic when the power is applied.

Conclusion

The MAX3085CPA+ transceiver is an ideal choice for a variety of applications where data signals need to be transferred between systems that process different logic levels. Its wide frequency range and low power consumption make it suitable for communication, computing and instrumentation systems, while the integrated dual-current-mode logic (CML)-to-Complementary Metal Oxide Semiconductor (CMOS) transceiver also provides maximum output current and minimum undershoot. The device is also designed to operate at very low power levels, making it suitable for a variety of applications where power consumption needs to be minimized.

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