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Analog Devices Inc./Maxim Integrated MAX9691ESA+
- Part No.:
- MAX9691ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX9691ESA+.pdf
- Description:
- IC COMPARATOR 1 W/LATCH 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:101
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Product details
Overview
MAX9691ESA+ from Maxim Integrated is a single-channel, ultra-fast ECL-output comparator with 1.2ns typical propagation delay, ±11.5mV input offset voltage, and dual ±5.2V/+5V supply operation. It features differential ECL-compatible inputs, complementary open-emitter outputs requiring external 50Ω–200Ω pull-down resistors to –2.0V or –5.2V, and is designed for high-speed line receivers and threshold detection in >600MHz signal processing systems.
For engineers reviewing the MAX9691ESA+ datasheet, MAX9691ESA+ pinout, MAX9691ESA+ application, or MAX9691ESA+ equivalent, this device requires attention to ECL-level termination, ground-plane PCB layout, latch-enable handling (not present on MAX9691), and thermal derating in SO-8 packaging - critical for stable high-frequency comparator deployment.
Technical Context
The MAX9691ESA+ employs BiCMOS process technology to achieve sub-2ns propagation delay while maintaining DC matching characteristics typical of slower comparators. Its differential input stage operates over a –2.5V to +3.0V common-mode range and delivers ECL-compatible logic outputs with VOH = –0.76V (typ) and VOL = –1.55V (typ) into 50Ω loads.
As a single-comparator without latch-enable functionality, it lacks LE pins and uses two independent ground pins (GND1 for input biasing, GND2 for output stage biasing). Output drive capability supports direct interfacing with 50Ω-terminated transmission lines, enabling clean edge transitions up to 600MHz with minimal dispersion (150ps).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 1.2ns typ - enables timing-critical decisions at >600MHz signal rates |
| Input Offset Voltage | ±11.5mV max - ensures accurate threshold detection under temperature variation |
| Supply Voltages | +5V VCC / –5.2V VEE - defines ECL-compatible rail-to-rail operation and noise margin |
| Output Configuration | Complementary open-emitter - requires external pull-down resistors (50Ω–200Ω to –2V) |
| Common-Mode Range | –2.5V to +3.0V - supports wide-range analog input interfacing with ECL logic |
| Propagation Skew | 100ps max - guarantees matched timing between Q and Q̅ outputs for balanced sampling |
| Dispersion | 150ps - limits delay variation across 10mV–100mV input overdrive range |
Pinout & Package
MAX9691ESA+ is housed in an 8-pin SO (Small Outline) package per outline no. 21-0041, RoHS-compliant with "+" suffix. Pin 1 is VCC; pins 7 and 8 are GND1 and GND2 respectively; pins 2 and 3 are IN+ and IN–; pin 4 is VEE; pins 5 and 6 are Q OUT and Q OUT (complementary open-emitter outputs).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Positive supply rail | Bypassed to GND with 0.1µF ceramic capacitor; powers input and output stages |
| 2 (IN+) | Differential noninverting input | Accepts ECL-compatible signals within –2.5V to +3.0V common-mode range |
| 3 (IN–) | Differential inverting input | Paired with IN+ for high-gain comparison; matched to minimize offset |
| 4 (VEE) | Negative supply rail | Bypassed to GND with 0.1µF ceramic capacitor; sets ECL logic reference |
| 5 (Q OUT) | Noninverting output | Open-emitter ECL output requiring external pull-down resistor to –2V or –5.2V |
| 6 (Q OUT) | Inverting output | Complementary to Q OUT; provides differential signaling for noise immunity |
| 7 (GND1) | Input-stage ground | Bias reference for differential input pair; must connect to solid ground plane |
| 8 (GND2) | Output-stage ground | Bias reference for ECL output transistors; separate from GND1 for isolation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low propagation delay | 1.2ns typ enables real-time decision-making in >600MHz RF and data acquisition systems |
| Dual ground pin architecture | GND1 and GND2 separation minimizes coupling between input and output stages for stability |
| ECL-compatible I/O levels | VOH = –0.76V / VOL = –1.55V (typ) into 50Ω ensures interoperability with standard ECL logic families |
| Low dispersion and skew | 150ps dispersion and 100ps skew preserve timing integrity across varying input overdrive conditions |
| High CMRR and PSRR | 80dB CMRR and 60dB PSRR suppress noise from supply rails and common-mode interference |
Applications
| High-Speed Line Receivers | Peak Detectors |
|---|---|
Use Scenario: Recovering high-frequency digital data from lossy coaxial or microstrip transmission lines operating above 500MHz. IC Role / Device Role / Timing Role: Comparator acting as threshold detector with sub-2ns decision latency to reconstruct NRZ or RZ waveforms. Use Value: Enables reliable bit recovery at >600MHz due to low propagation delay and matched Q/Q̅ timing. |
Use Scenario: Capturing maximum amplitude of fast transient pulses in radar pulse compression or laser time-of-flight systems. IC Role / Device Role / Timing Role: High-speed comparator comparing input against a dynamically adjusted reference to detect peak crossings. Use Value: 100ps skew ensures precise alignment between rising/falling edge detection paths for symmetric peak capture. |
| Threshold Detectors | High-Speed Triggers |
Use Scenario: Generating synchronous event flags when sensor outputs cross programmable thresholds in test equipment or oscilloscope front-ends. IC Role / Device Role / Timing Role: Precision comparator with ±11.5mV offset spec providing repeatable switching points across –40°C to +85°C. Use Value: Low temperature coefficient (10µV/°C) maintains threshold accuracy without calibration in industrial environments. |
Use Scenario: Initiating sampling windows or state transitions in high-speed ADC drivers, TDCs, or digital pattern generators. IC Role / Device Role / Timing Role: Fast comparator generating clean strobe edges with minimal jitter for clock-domain crossing. Use Value: 150ps dispersion ensures consistent trigger timing regardless of input signal amplitude variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ECL comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9691EUA+ | Same electrical specs but in 8-pin µMAX (3mm × 3mm) instead of SO-8; higher thermal resistance (4.8mW/°C derating vs. 7.4mW/°C) | Better suited for space-constrained layouts where board area is limited and airflow is controlled | Select MAX9691EUA+ only when footprint reduction outweighs thermal performance trade-off |
| ADCMP572BCPZ-R7 | 1.1ns propagation delay, 3.3V single-supply operation, LVDS outputs; no ECL compatibility or dual-ground architecture | Designed for mixed-signal SoC interfaces rather than legacy ECL systems; requires level-shifting for ECL integration | Choose ADCMP572BCPZ-R7 only when migrating to LVDS infrastructure and abandoning ECL rails |
Compared with MAX9691ESA+, MAX9691EUA+ offers identical speed and precision in a smaller package but reduced power dissipation headroom, while ADCMP572BCPZ-R7 provides faster raw delay at the cost of ECL interoperability and system-level redesign.
Availability
MAX9691ESA+ is available at Aetrix Electronics and suitable for high-speed line receivers, peak detectors, and threshold detectors requiring stable component supply across industrial temperature ranges and long-lifecycle programs.
Supply support for MAX9691ESA+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding performance applications including communications, computing, and industrial systems.
The MAX9691ESA+ belongs to Maxim's ultra-high-speed comparator product line, engineered specifically for ECL-based signal conditioning in >600MHz data acquisition, test instrumentation, and RF subsystems.
FAQ
What is the maximum operating frequency supported by the MAX9691ESA+?
The MAX9691ESA+ supports signal processing in excess of 600MHz, as confirmed by its 1.2ns typical propagation delay and verified 100MHz waveform response in application circuits. This performance is achievable only with proper microstrip layout, ground-plane implementation, and 50Ω termination - not a guaranteed bandwidth specification but a demonstrated operational limit under optimized conditions.
Does the MAX9691ESA+ include a latch-enable function?
No, the MAX9691ESA+ does not include a latch-enable function. Per the selector guide and pin description, only MAX9692 and MAX9693 variants feature LE inputs. The MAX9691ESA+ is a single comparator with no LE pin; unused LE-related pins are absent from its 8-pin SO package.
What external components are required for proper operation of the MAX9691ESA+?
The MAX9691ESA+ requires two 0.1µF ceramic decoupling capacitors (one each from VCC and VEE to GND), external 50Ω–200Ω pull-down resistors on both Q OUT and Q OUT pins referenced to –2.0V or –5.2V, and a solid copper ground plane. GND1 and GND2 must be connected together to that ground plane per layout guidelines.
How does the dual-ground architecture (GND1 and GND2) benefit the MAX9691ESA+?
The MAX9691ESA+ separates GND1 (input-stage reference) from GND2 (output-stage reference) to prevent switching noise from the high-current ECL output stage from modulating the sensitive input differential pair. This isolation improves stability, reduces spurious oscillation risk, and maintains DC matching integrity during fast output transitions.
Can the MAX9691ESA+ operate with a single supply voltage?
No, the MAX9691ESA+ requires dual supplies: +5V on VCC and –5.2V on VEE. Its ECL-compatible output levels and internal BiCMOS architecture depend on this negative rail to establish correct logic thresholds and output swing. Single-supply operation is not supported and would result in functional failure.
MAX9691ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- with Latch
- Number of Elements:
- 1
- Output Type:
- Complementary, ECL
- Voltage - Supply, Single/Dual (±):
- -
- :
- 6.5mV @ 5V
- Voltage - Input Offset (Max):
- 20µA @ 5V
- Current - Input Bias (Max):
- 50mA
- Current - Output (Typ):
- 26mA
- Current - Quiescent (Max):
- 80dB CMRR, 60dB PSRR
- CMRR, PSRR (Typ):
- 1.8ns
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
MAX9691ESA+ FAQ
1.How can I place an order for MAX9691ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9691ESA+ 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 MAX9691ESA+ reliable?
The price and inventory of MAX9691ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9691ESA+ is usually 5 days.
3.What payment methods are accepted for MAX9691ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9691ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9691ESA+?
MAX9691ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9691ESA+ 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 MAX9691ESA+?
For technical support, including MAX9691ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9691ESA+ requirements.
6.How does Aetrix verify that MAX9691ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX9691ESA+ 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 MAX9691ESA+ meets industry standards.
7.What is the process for return or replacement of MAX9691ESA+?
All MAX9691ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9691ESA+, 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 MAX9691ESA+ part is unused and in its original packaging.
Return procedure for MAX9691ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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