ADCMP552BRQZ

Overview

The ADCMP552BRQZ is a dual-channel, single-supply high-speed comparator fabricated on Analog Devices' proprietary XFCB process. It features differential PECL/LVPECL compatible outputs and a programmable hysteresis pin unique to this model. The device operates within a supply voltage range of 3.135 V to 5.25 V for both input (VCCI) and output (VCCO). Key electrical specifications include a typical propagation delay of 500 ps at 1 V overdrive and 625 ps at 20 mV overdrive. Overdrive dispersion is typically 75 ps across specified ranges. The component provides an input offset voltage of ±2.0 mV with a maximum of 10.0 mV. Power consumption includes a maximum input supply current of 17 mA and output supply current of 9 mA without load.

Feature Summary

• Features differential latch control inputs that allow the device to operate in track-and-hold or sample-and-hold modes, with internal pull-ups setting the default state to transparent tracking when left open.
• Includes dedicated programmable hysteresis pins (HYSA/HYSB) that generate symmetrical hysteresis independent of output swing, controlled by external resistors or current sources.
• Provides complementary digital outputs fully compatible with PECL and 3.3 V LVPECL logic families, capable of directly driving transmission lines terminated in 50 Ω.

Applications

• Automatic test equipment
• High speed instrumentation
• Scope and logic analyzer front ends
• Window comparators
• High speed line receivers

Procurement Notes

Verify the specific ordering suffix 'RQZ' corresponds to the 20-lead QSOP package configuration required for your PCB layout. Confirm that the procurement documentation explicitly references the Rev. B datasheet for accurate electrical characteristics, particularly regarding propagation delay and power supply rejection ratios. Ensure the supplier provides traceability to Analog Devices Inc. as the manufacturer.

Selection Notes

Select the ADCMP552BRQZ when a dual-channel comparator with integrated programmable hysteresis is required. Unlike the ADCMP551, this variant offers two channels and dedicated hysteresis control pins. Choose this part over the ADCMP553 if a larger package footprint is acceptable and dual-channel functionality is necessary. Ensure the design supports the required PECL termination voltages and single-supply operation constraints.

Part Context

This component belongs to the ADCMP55x family of single-supply, high-speed comparators. It shares the same core architecture and performance metrics as the ADCMP551 and ADCMP553 but differs in channel count and package type. The ADCMP552 specifically utilizes a 20-lead QSOP package, providing additional pins for the second channel and the programmable hysteresis controls not present in the single-channel variants.

Replacement Considerations

The ADCMP551BRQZ serves as a single-channel alternative lacking the second comparator and hysteresis pins. The ADCMP553BRMZ is an 8-lead MSOP single-channel option. Direct substitution requires verifying pin compatibility and ensuring the application does not utilize the unused channels or hysteresis features of the ADCMP552.

FAQ

How is hysteresis programmed on the ADCMP552?

Hysteresis is generated through the programmable HYS pins (HYSA and HYSB). Connecting a resistor from these pins to VCCI creates a current that generates symmetrical hysteresis around the trip point, independent of the output swing.

What is the default state of the Latch Enable inputs?

The Latch Enable inputs contain internal pull-ups. When left open, these pull-ups set the latch to transparent mode, allowing the output to track changes at the input.

Can the ADCMP552 drive transmission lines directly?

Yes, the differential outputs provide sufficient drive current to directly drive transmission lines terminated in 50 Ω to VCCO − 2 V, making them compatible with standard PECL termination schemes.