ASNT6119B-KMF

Overview

The ASNT6119B-KMF is a SiGe-based advanced driver-amplifier (ADA) designed for high-speed data transmission applications. It features a built-in four-tap pre-emphasis generator controlled via a standard 3-wire serial interface. The device operates at data rates up to 33.5 Gbps with an average power consumption of 4.0W. It utilizes fully differential CML interfaces for data and clock signals, supporting both DC and AC coupling on inputs. The IC requires dual power supplies: a negative supply of -4.3V and a floating positive supply of +3.5V. It is housed in a custom 64-pin CQFP package with a center heat slug for thermal management.

Feature Summary

• Integrates a programmable four-tap pre-emphasis generator with user-controlled weights and polarities.
• Includes an optional main clock frequency multiplier by two with duty cycle monitoring and adjustment capabilities.
• Provides adjustable data output amplitude, eye quality, and single-ended output data eye cross-point positioning.
• Features an on-chip linear temperature sensor and supports parallel or opposite adjustment of main clock and data delays.

Applications

• High-speed optical transceivers requiring signal integrity enhancement
• Backplane interconnect systems utilizing pre-emphasis techniques
• Test and measurement equipment generating high-speed differential signals

Procurement Notes

Verify the specific revision level against the datasheet Rev.1.2.2 dated January 2020. Confirm that the system design accommodates the required dual power supply rails of -4.3V and +3.5V. Ensure the PCB layout supports the custom 64-pin CQFP package dimensions and provides adequate thermal dissipation for the center heat slug to maintain junction temperatures within specified limits.

Selection Notes

Select this component when a fixed-rate driver is insufficient and programmable pre-emphasis is required to mitigate channel loss. The internal clock multiplier allows operation with lower input clock frequencies while maintaining high data throughput. Consider the analog control requirements for tap weights and duty cycle adjustments during the schematic design phase to ensure optimal signal performance across varying environmental conditions.

Part Context

This device belongs to ADSANTEC's portfolio of high-speed silicon-germanium integrated circuits. It serves as a specialized solution for driving high-speed serial links where signal distortion must be actively compensated. The integration of digital control interfaces with analog tuning ports distinguishes it from standard buffer amplifiers, offering flexibility in system equalization strategies without external discrete components.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should evaluate functional compatibility regarding pinout, power supply requirements, and interface protocols if considering alternative drivers from other manufacturers.

FAQ

How is the pre-emphasis weight adjusted?

Pre-emphasis weights are adjusted using four external analog voltages (tune1 through tune4) for linear control, alongside digital signals that assign buffers to specific taps and determine their polarity.

What is the function of the phadj pin?

The phadj pin serves a dual function: it activates the clock multiplier circuit and provides linear phase control to adjust the duty cycle of the multiplied-by-two clock signal.

Can the device operate without the clock multiplier?

Yes, applying a voltage below the switch-off threshold to the phadj pin disables the multiplication function, allowing the input clock to pass directly to the internal logic.