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Analog Devices Inc. ADCMP551BRQ
- Part No.:
- ADCMP551BRQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADCMP551BRQ.pdf
- Description:
- IC COMPARATOR 2 W/LATCH 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,177
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Product details
Overview
ADCMP551BRQ from Analog Devices is a single-supply, high-speed PECL/LVPECL comparator with 500 ps propagation delay, 125 ps overdrive dispersion, and differential latch control - designed for precision timing-critical applications including ATE front ends, logic analyzer inputs, and high-speed threshold detection.
For engineers reviewing the ADCMP551BRQ datasheet, ADCMP551BRQ pinout, ADCMP551BRQ application, or ADCMP551BRQ equivalent, this page delivers verified electrical specs, QSOP-16 package mapping, latch-enabled sampling behavior, PECL-compatible output drive capability, and real-world design context for signal integrity-sensitive systems.
Technical Context
The ADCMP551BRQ features a proprietary XFCB process-based differential input stage supporting −0.2 V to VCCI − 2.0 V common-mode range and delivering <750 MHz equivalent input rise time bandwidth. Its dual complementary PECL outputs drive 50 Ω terminations to VCCO − 2 V with typical 500 ps rise/fall times.
It implements a transparent latch mode via LEA/LEA pins (internally pulled up), enabling track-and-hold operation without external biasing. Propagation delay dispersion remains ≤125 ps across 20 mV–1 V overdrive, ensuring consistent timing in jitter-sensitive applications like clock recovery and high-speed triggers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 500 ps at 1 V overdrive - enables sub-nanosecond decision timing for 800 MHz toggle-rate systems |
| Overdrive Dispersion | ≤125 ps (20 mV–1 V) - minimizes timing skew across varying input amplitudes in ATE and instrumentation |
| Input Common-Mode Range | −0.2 V to VCCI − 2.0 V - supports direct interfacing with LVDS, CML, and terminated transmission lines |
| Output Compatibility | PECL/LVPECL - drives 50 Ω to VCCO − 2 V with VOH = VCCO − 0.78 V, VOL = VCCO − 1.54 V |
| Supply Voltages | VCCI = 3.135–5.25 V, VCCO = 3.135–5.25 V - allows independent input/output rail optimization |
| Power Dissipation | 55 mW typical (no load), 110 mW typical (with load) - manageable thermal profile in dense PCB layouts |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded and test equipment deployment |
Pinout & Package
ADCMP551BRQ is housed in a 16-lead QSOP (RQ-16) package with exposed pad thermal enhancement per JEDEC MO-137-AD. Pin spacing is 0.025" (0.635 mm), body width 0.154" (3.91 mm), and total height 0.063" (1.60 mm).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | QA / QA | Complementary PECL outputs for Channel A - directly drive 50 Ω transmission lines to VCCO − 2 V |
| 3, 14 | VCCO | Output supply terminal - powers output stage independently; must be decoupled with 10 nF ceramic + 1 μF electrolytic |
| 4, 5 | LEA / LEA | Differential latch enable inputs - internally pulled up; open-circuit defaults to tracking mode |
| 6 | VCCI | Input supply terminal - powers input stage and internal bias; separate from VCCO for noise isolation |
| 7, 8 | −INA / +INA | Differential analog inputs for Channel A - support −0.2 V to VCCI − 2.0 V common-mode range |
| 9, 10 | −INB / +INB | Differential analog inputs for Channel B - identical specs to Channel A; unused inputs must be biased |
| 11, 12 | QB / QB | Complementary PECL outputs for Channel B - fully matched timing and drive to QA/QA |
| 13 | AGND | Analog ground reference - requires low-inductance connection to solid ground plane for optimal jitter performance |
| 15, 16 | LEB / LEB | Differential latch enable for Channel B - functionally identical to LEA/LEA with independent control |
Key Features
| Feature | Design Value |
|---|---|
| Programmable hysteresis | Not available on ADCMP551BRQ - hysteresis pin (HYSA/HYSB) is exclusive to ADCMP552/ADCMP553 variants |
| Latch control architecture | Dual differential LEA/LEA and LEB/LEB inputs with internal pull-ups - eliminates need for external bias resistors |
| PSRR performance | 75 dB (VCCI), 85 dB (VCCO) - suppresses supply noise coupling into timing decisions and output edges |
| Minimum pulse width | 700 ps - supports clean sampling of ultra-narrow digital pulses in high-speed test and diagnostics |
| RMS random jitter | 1.1 ps (500 MHz, 50% duty cycle) - enables reliable edge detection in sub-2 ns timing windows |
Applications
| Automatic Test Equipment (ATE) Front Ends | Logic Analyzer Input Stages |
|---|---|
Use Scenario: Capturing nanosecond-scale digital waveforms from DUTs under high-speed stimulus. IC Role / Device Role / Timing Role: High-fidelity threshold detector converting analog waveform edges into deterministic PECL logic levels. Use Value: 500 ps propagation delay and ≤125 ps overdrive dispersion ensure precise timestamp alignment across multi-channel capture systems. |
Use Scenario: Digitizing high-frequency probe signals with minimal added jitter or skew. IC Role / Device Role / Timing Role: Signal restoration and level translation stage before FPGA-based acquisition logic. Use Value: Differential PECL outputs drive 50 Ω cables directly, preserving signal integrity up to 800 MHz toggle rate. |
| High-Speed Window Comparators | Disk Drive Read Channel Detection |
Use Scenario: Detecting valid data windows in serial communication links with amplitude-varying signals. IC Role / Device Role / Timing Role: Dual-channel comparator implementing upper/lower threshold comparison with synchronized latch control. Use Value: Matched channel-to-channel skew (<35 ps) ensures accurate window boundary timing without calibration. |
Use Scenario: Extracting timing edges from weak, noisy magnetic readback signals in HDD preamplifier chains. IC Role / Device Role / Timing Role: Low-noise, high-bandwidth threshold detector recovering clock and data from analog read heads. Use Value: 750 MHz equivalent input bandwidth and −10 mV to +10 mV offset voltage support robust signal slicing at Gb/s rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADCMP552BRQ | 20-lead QSOP; adds programmable hysteresis pin (HYSA/HYSB); same propagation delay and dispersion specs | Required where input noise mandates adjustable hysteresis; not drop-in due to extra pins and different pinout | Select ADCMP552BRQ only if hysteresis tuning is needed - ADCMP551BRQ offers identical speed and latch functionality in smaller footprint |
| MAX999ESA+ | Single-channel, 4.5 ns propagation delay, CMOS/TTL outputs, no latch, 5 V supply only | Suitable for lower-speed general-purpose threshold detection; lacks PECL drive, latch, or multi-channel capability | Choose MAX999ESA+ only for cost-sensitive, non-PECL, single-ended applications below 200 MHz - not a functional substitute for ADCMP551BRQ's high-speed dual-channel role |
Compared with ADCMP552BRQ, ADCMP551BRQ saves board space and simplifies layout by omitting hysteresis control while retaining full dual-channel latch timing performance; versus MAX999ESA+, ADCMP551BRQ delivers >15× faster propagation, PECL compatibility, and deterministic sampling - essential for ATE and instrumentation signal chains.
Availability
ADCMP551BRQ is available at Aetrix Electronics and suitable for automatic test equipment, high-speed instrumentation, and logic analyzer front-end designs requiring stable component supply, long-term lifecycle assurance, and traceable industrial-grade sourcing.
Supply support for ADCMP551BRQ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with R&D and manufacturing operations worldwide.
The ADCMP55x family was developed specifically for ultra-high-speed timing-critical applications - emphasizing low propagation delay dispersion, PECL/LVPECL interoperability, and latch-controlled sampling in ATE, medical diagnostics, and communications infrastructure.
FAQ
What is the maximum operating frequency supported by ADCMP551BRQ?
The ADCMP551BRQ supports a maximum toggle rate exceeding 800 MHz with >50% output swing, validated under typical conditions (VCCI = VCCO = 3.3 V, TA = 25°C). Its 500 ps propagation delay and 700 ps minimum pulse width enable reliable operation in systems requiring sub-nanosecond timing resolution, such as high-speed ATE and oscilloscope front ends.
Does ADCMP551BRQ include programmable hysteresis?
No, ADCMP551BRQ does not include programmable hysteresis. That feature is exclusive to the ADCMP552BRQ (via HYSA/HYSB pins) and ADCMP553BRM (via HYS pin). The ADCMP551BRQ provides fixed internal hysteresis of ±0.5 mV, sufficient for low-noise environments but not adjustable externally.
What are the recommended power supply decoupling practices for ADCMP551BRQ?
Analog Devices specifies a 10 nF ceramic capacitor placed as close as possible to each VCCI and VCCO pin, plus a 1 μF electrolytic capacitor within 0.5 inches of each supply pin. This dual-stage decoupling minimizes high-frequency supply noise and prevents output ringing or jitter degradation during fast transitions in the ADCMP551BRQ.
Can ADCMP551BRQ operate with different input and output supply voltages?
Yes, ADCMP551BRQ supports independent input (VCCI) and output (VCCO) supplies ranging from 3.135 V to 5.25 V each, with a maximum differential of +2.3 V (VCCO − VCCI). This allows optimization of input noise immunity and output drive strength separately - for example, using 3.3 V for VCCI and 5 V for VCCO to maximize PECL swing.
How is latch functionality implemented on ADCMP551BRQ?
ADCMP551BRQ uses differential latch enable inputs (LEA/LEA and LEB/LEB) with internal pull-up resistors. When left open, LEA/LEA defaults to logic high, placing Channel A in transparent (track) mode. Driving LEA low latches the output state. Identical behavior applies to Channel B via LEB/LEB - enabling independent or synchronized sampling control.
ADCMP551BRQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- with Latch
- Number of Elements:
- 2
- Output Type:
- Complementary, Differential, LVPECL, Open-Emitter, PECL
- Voltage - Supply, Single/Dual (±):
- 3.14V ~ 5.25V
- :
- 10mV @ 3.3V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 17mA
- Current - Quiescent (Max):
- 76dB CMRR, 75dB PSRR
- CMRR, PSRR (Typ):
- 0.625ns
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 16-QSOP
ADCMP551BRQ FAQ
1.How can I place an order for ADCMP551BRQ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADCMP551BRQ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADCMP551BRQ reliable?
The price and inventory of ADCMP551BRQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADCMP551BRQ is usually 5 days.
3.What payment methods are accepted for ADCMP551BRQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADCMP551BRQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADCMP551BRQ?
ADCMP551BRQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADCMP551BRQ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADCMP551BRQ?
For technical support, including ADCMP551BRQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADCMP551BRQ requirements.
6.How does Aetrix verify that ADCMP551BRQ is sourced from the original manufacturer or authorized distributors?
All ADCMP551BRQ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADCMP551BRQ meets industry standards.
7.What is the process for return or replacement of ADCMP551BRQ?
All ADCMP551BRQ units undergo pre-shipment inspection (PSI). If there is an issue with ADCMP551BRQ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADCMP551BRQ part is unused and in its original packaging.
Return procedure for ADCMP551BRQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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