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Product Detailed Parameters
- Description：IC COMPARATOR 2 W/LATCH 16QSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Type：with Latch
- Number of Elements：2
- Output Type：Complementary, Differential, LVPECL, Open-Emitter, PECL
- Voltage - Supply, Single/Dual (±)：3.14V ~ 5.25V
- Voltage - Input Offset (Max)：10mV @ 3.3V
- Current - Input Bias (Max)：-
- Current - Output (Typ)：-
- Current - Quiescent (Max)：17mA
- CMRR, PSRR (Typ)：76dB CMRR, 75dB PSRR
- Propagation Delay (Max)：0.625ns
- Hysteresis：-
- Operating Temperature：-40°C ~ 85°C
- Package / Case：16-SSOP (0.154", 3.90mm Width)
- Mounting Type：Surface Mount
- Supplier Device Package：16-QSOP
- Grade：-
- Qualification：-
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Overview
The ADCMP551BRQZ is a single-supply, high-speed comparator fabricated on Analog Devices' proprietary XFCB process. It features a 500 ps propagation delay and less than 125 ps overdrive dispersion. The device provides differential PECL/LVPECL compatible outputs capable of directly driving 50 Ω terminated transmission lines. It operates with supply voltages between 3.135 V and 5.25 V and includes latch control for tracking or sample-and-hold modes.
Feature Summary
- Differential input stage ensures consistent propagation delay across varying common-mode conditions.
- Complementary digital outputs are fully compatible with PECL and 3.3 V LVPECL logic families.
- Internal latch enable inputs allow for transparent, track-and-hold, or sample-and-hold operation modes.
Applications
- Automatic test equipment
- High speed instrumentation
- Window comparators
- Threshold detection
- Zero crossing detectors
Procurement Notes
Verify the specific ordering suffix BRQZ to confirm the package type and temperature range match design requirements. Ensure power supply decoupling capacitors are placed close to the pins to maintain high-speed performance. Confirm that the PCB layout utilizes a low impedance ground plane to minimize stray capacitance and inductance effects.
Selection Notes
Select this component when a single-channel comparator with differential PECL outputs is required. Consider the ADCMP552 if programmable hysteresis is needed, or the ADCMP553 for an 8-lead MSOP package. Ensure the application supports the specified industrial temperature range and voltage levels.
Part Context
This part belongs to the ADCMP551/ADCMP552/ADCMP553 family of high-speed comparators. All members share the same core architecture and electrical characteristics but differ in channel count and package options. The ADCMP551 specifically offers a single channel in a 16-lead QSOP package.
Replacement Considerations
Direct substitutes within the same family include the ADCMP552 (dual channel, 20-lead QSOP) and ADCMP553 (single channel, 8-lead MSOP). Verify pin compatibility and package dimensions before substitution.
FAQ
How does the ADCMP551 handle unused comparator channels?
Unused inputs should not be left floating. To prevent oscillation due to high internal gain, ensure the two inputs are at least one diode drop apart and connect the LATCH ENABLE inputs appropriately.
What is the recommended termination for the PECL outputs?
The open-emitter outputs are designed to be terminated through 50 Ω resistors to VCCO − 2.0 V or any other equivalent PECL termination scheme.
