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Analog Devices Inc./Maxim Integrated MAX7461EUK+
- Part No.:
- MAX7461EUK+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Video Processing
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX7461EUK+.pdf
- Description:
- IC VID LOSS-OF-SYNC ALARM SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,096
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Product details
Overview
MAX7461EUK+ from Maxim Integrated is a single-channel loss-of-sync (LOS) alarm IC for composite video sync detection in NTSC, PAL, and SECAM SDTV systems. It accepts AC-coupled CVBS, luma (Y), or any sync-bearing video signal; delivers open-drain LOS output with 3.4ms typical detect time and 2.2ms typical release time; operates from +4.5V to +5.5V; and is used in video security camera switching matrices to monitor source integrity.
For engineers reviewing the MAX7461EUK+ datasheet, MAX7461EUK+ pinout, MAX7461EUK+ application, or MAX7461EUK+ equivalent, key selection considerations include input sync height threshold (130mVP-P typ), power-supply noise immunity (200mVP-P up to 5MHz), open-drain wired-OR capability, and -40°C to +85°C industrial temperature operation.
Technical Context
The MAX7461EUK+ implements a dedicated analog sync detector with line-by-line DC clamp and integrated lowpass filter to reject chroma, color burst, and noise-ensuring robust false-alarm suppression. Its internal LOS filter triggers after ≥3.4ms (typ) of missing sync pulses and releases after ≥2.2ms (typ) of valid sync presence.
Power-on reset holds LOS low until 2.2ms (typ) of valid sync is confirmed. The open-drain LOS output requires an external 1kΩ pullup to VCC and supports wired-OR alarm aggregation across multiple video channels in multi-camera systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5V to +5.5V - compatible with standard 5V logic rails and tolerant of common supply ripple. |
| Sync Detect Threshold | 130mVP-P min - ensures reliable sync recognition even under attenuated or noisy video signals. |
| LOS Detect Time | 3.4ms typ - sets minimum blanking interval before declaring loss of sync, avoiding transient dropout false alarms. |
| LOS Release Time | 2.2ms typ - defines minimum stable sync duration required to reassert valid signal presence. |
| Power-Supply Noise Immunity | 200mVP-P up to 5MHz - allows stable operation without additional LDO filtering in noisy 5V domains. |
| Input Signal Type | AC-coupled CVBS/Y/any sync-bearing video - mandates 0.1µF series capacitor; prohibits DC coupling. |
| Output Type | Open-drain LOS - enables wired-OR alarm bus with external pullup; sinks ≥10mA at 0.4V. |
Pinout & Package
The MAX7461EUK+ is housed in a 5-pin SOT23 package (U5-2 outline, RoHS-compliant), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Video Input | Accepts AC-coupled CVBS, Y, or sync-bearing video; requires 0.1µF series capacitor for DC clamping. |
| 2,3 GND | Ground Reference | Dual ground pins reduce ground bounce; must connect to low-inductance ground plane. |
| 4 LOS | Loss-of-Sync Output | Open-drain alarm output; sinks current when sync lost; high-impedance when sync present; requires 1kΩ pullup to VCC. |
| 5 VCC | Power Supply | +4.5V to +5.5V input; must be bypassed to GND with 0.1µF ceramic capacitor near the pin. |
Key Features
| Feature | Design Value |
|---|---|
| Line-by-line DC clamp | Compensates for baseline wander on each video line, enabling stable sync detection without external clamping circuitry. |
| Integrated lowpass filter | Attenuates chroma, color burst, and high-frequency noise to prevent false sync pulse recognition. |
| Wired-OR alarm output | Enables direct connection of multiple MAX7461EUK+ devices to a shared LOS bus without logic-level translation or isolation. |
| Robust noise immunity | Validates sync presence under 200mVP-P supply noise up to 5MHz-eliminates need for ultra-clean 5V rail in cost-sensitive designs. |
Applications
| Video Security Camera Systems | SDTV Broadcast Monitoring |
|---|---|
Use Scenario: Multi-camera surveillance system with automatic failover to backup feed upon primary camera signal loss. IC Role / Device Role / Timing Role: MAX7461EUK+ continuously monitors CVBS output of each camera channel and asserts LOS low upon sync dropout. Use Value: Enables microcontroller-driven switching within <5ms of sync loss, meeting real-time response requirements for critical security feeds. | Use Scenario: Analog broadcast signal integrity checker in headend equipment verifying incoming NTSC/PAL feeds. IC Role / Device Role / Timing Role: MAX7461EUK+ acts as dedicated sync presence detector per input path, feeding status to system health controller. Use Value: Provides deterministic, jitter-insensitive sync validation independent of video decoding pipeline-reducing false positives during field sync transitions. |
| Consumer Set-Top Box Inputs | Legacy Video Switching Matrix |
Use Scenario: Consumer STB with composite video input auto-detection and source alerting. IC Role / Device Role / Timing Role: MAX7461EUK+ monitors Y/CVBS input for sync presence prior to video processing activation. Use Value: Prevents spurious video processing startup and display artifacts by confirming valid sync before enabling downstream analog-to-digital conversion. | Use Scenario: Professional AV switcher aggregating up to 16 legacy video sources with centralized alarm reporting. IC Role / Device Role / Timing Role: MAX7461EUK+ provides per-channel LOS output wired-OR'd into a single system alarm bus. Use Value: Reduces component count and PCB area versus discrete comparator-based solutions while maintaining channel-isolated fault detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar loss-of-sync detection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX7460EUK+ | Same pinout and function but lacks internal lowpass filter; requires external RC filtering for noise rejection. | Suitable only in low-noise environments where external filtering is acceptable. | Select MAX7461EUK+ when robust sync detection in electrically noisy video systems is required without added passive components. |
| LM1881N/NOPB | Generates composite sync, blanking, and vsync outputs; no dedicated LOS alarm output; requires external comparator for loss detection. | Used for sync extraction-not loss monitoring-so adds design complexity for alarm functionality. | Choose MAX7461EUK+ when a purpose-built, single-component LOS solution with guaranteed timing and open-drain output is needed. |
Compared with MAX7460EUK+, the MAX7461EUK+ integrates noise-rejecting lowpass filtering and delivers a ready-to-use open-drain alarm; compared with LM1881N/NOPB, it eliminates external comparators and timing components, reducing BOM count and layout area for dedicated sync-loss monitoring.
Availability
MAX7461EUK+ is available at Aetrix Electronics and suitable for video security systems, SDTV broadcast monitoring, and consumer set-top box designs requiring stable component supply, long-term industrial temperature support, and RoHS-compliant packaging.
Supply support for MAX7461EUK+ 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, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX7461EUK+ belongs to Maxim's video interface and timing protection product line, engineered specifically for reliable sync integrity monitoring in legacy analog video infrastructure.
FAQ
What is the minimum input sync amplitude required for reliable operation of the MAX7461EUK+?
The MAX7461EUK+ guarantees sync detection for input sync amplitudes ≥130mVP-P (typical), with 105mVP-P minimum under worst-case conditions. This threshold is measured at the IN pin after AC coupling and accounts for internal clamping and filtering. Below this level, the MAX7461EUK+ may assert LOS low even if sync is physically present-so system design must ensure signal integrity meets this spec.
Can the MAX7461EUK+ be used with DC-coupled video inputs?
No, the MAX7461EUK+ requires AC-coupled inputs only. Its internal line-by-line DC clamp relies on the external 0.1µF series capacitor to store and restore the correct DC bias for sync detection. DC coupling bypasses this mechanism and causes unreliable or failed sync recognition. The MAX7461EUK+ datasheet explicitly prohibits DC-coupled operation.
What external components are mandatory for proper operation of the MAX7461EUK+?
Two external components are mandatory: a 0.1µF ceramic capacitor in series with the IN pin for AC coupling, and a 1kΩ pullup resistor from the LOS pin to VCC. The VCC pin also requires a 0.1µF ceramic bypass capacitor to GND, placed as close as possible to the device. Omitting any of these compromises sync detection reliability or output drive capability in the MAX7461EUK+.
How does the MAX7461EUK+ behave during power-up?
At power-up, the MAX7461EUK+ asserts LOS low (active state) and remains low until it detects ≥2.2ms (typ) of valid sync pulses. This built-in power-on reset prevents false "sync present" assertions during supply ramp-up. Only after confirming stable sync does the MAX7461EUK+ release LOS to high-impedance-ensuring downstream logic sees a clean, debounced alarm state.
Is the MAX7461EUK+ compatible with SECAM video signals?
Yes, the MAX7461EUK+ is explicitly specified for NTSC, PAL, and SECAM standard-definition television systems. Its sync detector responds to horizontal sync pulses regardless of encoding format, and its 130mVP-P minimum sync height threshold accommodates SECAM's higher peak-to-peak sync amplitude. No configuration or external adjustment is needed-the MAX7461EUK+ operates identically across all three standards.
MAX7461EUK+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Alarm
- Applications:
- Professional Video
- Standards:
- NTSC, PAL, SECAM
- Control Interface:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-5
MAX7461EUK+ FAQ
1.How can I place an order for MAX7461EUK+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX7461EUK+ 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 MAX7461EUK+ reliable?
The price and inventory of MAX7461EUK+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX7461EUK+ is usually 5 days.
3.What payment methods are accepted for MAX7461EUK+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX7461EUK+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX7461EUK+?
MAX7461EUK+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX7461EUK+ 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 MAX7461EUK+?
For technical support, including MAX7461EUK+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX7461EUK+ requirements.
6.How does Aetrix verify that MAX7461EUK+ is sourced from the original manufacturer or authorized distributors?
All MAX7461EUK+ 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 MAX7461EUK+ meets industry standards.
7.What is the process for return or replacement of MAX7461EUK+?
All MAX7461EUK+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX7461EUK+, 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 MAX7461EUK+ part is unused and in its original packaging.
Return procedure for MAX7461EUK+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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