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Analog Devices Inc./Maxim Integrated MAX9248GCM+
- Part No.:
- MAX9248GCM+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Serializers, Deserializers
- Package:
- 48-LQFP
- Datasheet:
-
MAX9248GCM+.pdf
- Description:
- IC DESERIALIZER LVDS 48-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:245
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Product details
Overview
MAX9248GCM+ from Maxim Integrated is a 27-bit DC-balanced LVDS deserializer IC for automotive and industrial video interfaces, converting 5–35MHz LVDS serial input into 18-bit RGB video + 9-bit control parallel outputs with programmable ±2% or ±4% spread-spectrum clocking, ISO 10605 ±10kV contact ESD rating, and operation from -40°C to +105°C in 48-lead LQFP.
For engineers reviewing the MAX9248GCM+ datasheet, MAX9248GCM+ pinout, MAX9248GCM+ application, or MAX9248GCM+ equivalent, this page delivers verified functional identity, exact package mapping (LQFP-48), confirmed spread-spectrum behavior (±2%/±4%), latch-edge select (R/F), and interoperability with MAX9247 serializer - all critical for display interface design, EMI-sensitive vehicle systems, and timing-critical video busing.
Technical Context
The MAX9248GCM+ implements a dual-phase deserialization architecture: video data (RGB_OUT[17:0]) is latched during active DE_OUT high periods, while control data (CNTL_OUT[8:0]) is recovered during blanking intervals when DE_OUT is low. Its proprietary DC-balanced encoding enables AC-coupling isolation and reduces common-mode noise across long cables.
A dedicated SSPLL generates spread-spectrum PCLK_OUT and data outputs with modulation rates scaling linearly with REFCLK (e.g., 41.01kHz at 42MHz), and lock acquisition requires up to 33,600 REFCLK cycles. Input frequency detection disables outputs and asserts LOCK high if no LVDS transitions are detected for 222 PCLK_OUT cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Deserialization Rate | 5MHz to 35MHz parallel clock (REFCLK), supporting up to 840Mbps serial data rate on LVDS input |
| Output Configuration | 18-bit RGB video (RGB_OUT[17:0]) + 9-bit control (CNTL_OUT[8:0]) + DE_OUT, PCLK_OUT, LOCK - all LVTTL/LVCMOS |
| Spread-Spectrum Control | SS pin selects ±2% (low) or ±4% (high) frequency deviation of PCLK_OUT and data outputs relative to REFCLK |
| ESD Protection | ISO 10605 ±10kV contact / ±30kV air-gap on IN+/IN−; IEC 61000-4-2 Level 4 compliant |
| Supply & Interface | +3.3V ±10% core supply (VCC); separate 1.8V–3.3V output supply (VCCO); internal 60kΩ LVDS bias resistors |
| Operating Temperature | -40°C to +105°C ambient, qualified for automotive-grade thermal environments |
| Package | 48-lead LQFP (7mm × 7mm, 0.5mm pitch), lead-free and RoHS-compliant |
Pinout & Package
MAX9248GCM+ is housed in a 48-lead LQFP package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are validated per Maxim's MAX9248/MAX9250 Rev 5 datasheet (19-3943). All pins support LVTTL/LVCMOS logic levels unless specified as LVDS or analog inputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R/F (Pin 1) | Latch edge select | Configures PCLK_OUT edge for latching: high = rising edge, low = falling edge - decouples timing from serializer polarity |
| RNG1/RNG0 (Pins 2, 9) | Frequency range selector | Sets operating band (5–10/10–20/20–35MHz) and output transition time; determines worst-case current draw |
| SS (Pin 14) | Spread-spectrum enable | Drives high for ±4% spread, low for ±2% - triggers 32,800×tT delay before valid output resumption |
| REFCLK (Pin 12) | Reference clock input | ±2% tolerance LVTTL/LVCMOS clock used for initial PLL lock prior to serial input synchronization |
| RGB_OUT[17:0] (Pins 29–36, 39–48) | Video data outputs | 18-bit parallel RGB bus, grouped into three staggered 6-bit banks to reduce simultaneous switching noise |
| CNTL_OUT[8:0] (Pins 15–23) | Control data outputs | 9-bit control bus active during DE_OUT low; C0–C4 tolerate single-bit errors via majority voting |
| PCLK_OUT (Pin 28) | Parallel clock output | Recovered clock derived from LVDS stream; stretched during REFCLK → recovered-clock transition |
| DE_OUT (Pin 24) | Data-enable indicator | High = RGB_OUT valid; low = CNTL_OUT valid - defines phase boundary between video and control words |
Key Features
| Feature | Design Value |
|---|---|
| DC-balanced deserialization | Enables AC-coupling with 0.1µF capacitors; blocks ground shifts and common-mode noise over CAT5 cable |
| Programmable spread-spectrum clocking | Reduces peak EMI by spreading PCLK_OUT and data spectra ±2% or ±4%, verified in spectral plots up to 42MHz |
| Staggered RGB output switching | Three 6-bit groups switch ~1ns apart, lowering di/dt and minimizing ground bounce in high-speed video buses |
| Single-bit-error tolerant control decoding | C0–C4 bits use triple-sampling majority vote; ensures robust command recovery even with bit errors on noisy links |
| Transition-word lock detection | Valid outputs only after detecting sync word in serial stream; LOCK goes low only when stable video/control data is ready |
Applications
| Navigation System Displays | In-Vehicle Entertainment Systems |
|---|---|
Use Scenario: High-resolution TFT LCD display in automotive head units, receiving video from camera or media processor over shielded twisted-pair cable. IC Role / Device Role / Timing Role: Deserializes LVDS video stream into parallel RGB + DE + PCLK for direct LCD controller interface; handles blanking-period control commands. Use Value: Enables EMI-compliant 35MHz video transmission over >10m CAT5 cable with BER <10⁻¹², meeting automotive EMC requirements. |
Use Scenario: Multi-display infotainment system with rear-seat monitors, requiring synchronized video distribution from central media hub. IC Role / Device Role / Timing Role: Receives serialized video from MAX9247 serializer; provides latch-edge configurable outputs to match downstream FPGA or ASIC timing constraints. Use Value: R/F pin allows alignment with either rising- or falling-edge capture logic, eliminating external flip-flop buffers and reducing BOM count. |
| Video Cameras | LCD Displays |
Use Scenario: Rear-view or surround-view camera module transmitting raw video to ADAS domain controller over compact harness. IC Role / Device Role / Timing Role: Converts serialized camera sensor output into parallel RGB bus; recovers embedded control signals (e.g., exposure, gain) during blanking intervals. Use Value: Five control bits (C0–C4) with majority-vote decoding ensure reliable camera parameter updates despite cable-induced bit errors. |
Use Scenario: Industrial panel PC with integrated LVDS-to-RGB bridge, requiring low-jitter clock recovery and DC-balanced signaling for long-life display operation. IC Role / Device Role / Timing Role: Acts as timing-critical deserializer with ±2% REFCLK tolerance and sub-36tT input-to-output delay variation under spread-spectrum mode. Use Value: Internal 60kΩ LVDS bias resistors eliminate external termination components, simplifying PCB layout and improving signal integrity at 35MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LVDS deserializer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9250GCM+ | No spread-spectrum; includes OUTEN pin for output busing; identical pinout and timing except SS/OUTEN function swap | Better suited for multi-deserializer mux architectures where output enable sequencing is required | Select MAX9250GCM+ when busing outputs (e.g., 2:1 video mux) is needed; MAX9248GCM+ preferred for EMI reduction in single-link systems |
| TI DS90UB928QSQ/NOPB | FPGA-configurable 27-bit deserializer; supports FPD-Link III protocol; higher max clock (65MHz); different pinout and register map | Designed for TI ecosystem integration (e.g., Jacinto processors); requires firmware configuration vs. hardware-pin control | Choose DS90UB928QSQ/NOPB for scalable multi-camera systems with dynamic reconfiguration; MAX9248GCM+ offers simpler, pin-driven setup |
Compared with MAX9250GCM+, MAX9248GCM+ trades busing capability for certified EMI reduction via hardware-programmable spread-spectrum; versus DS90UB928QSQ/NOPB, it eliminates configuration overhead but lacks protocol flexibility and higher bandwidth - making it optimal for fixed-function, cost-sensitive automotive displays.
Availability
MAX9248GCM+ is available at Aetrix Electronics and suitable for navigation system displays, in-vehicle entertainment systems, and video cameras requiring stable component supply, automotive-grade temperature operation (-40°C to +105°C), and EMI-compliant video transmission.
Supply support for MAX9248GCM+ 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 automotive, industrial, and communications markets.
The MAX9248GCM+ belongs to Maxim's automotive-qualified LVDS deserializer family, engineered specifically for high-reliability video links in safety-critical vehicle subsystems with stringent EMI and thermal requirements.
FAQ
What is the maximum operating frequency supported by the MAX9248GCM+?
The MAX9248GCM+ supports a parallel clock frequency range of 5MHz to 35MHz, corresponding to an LVDS serial data rate up to 840Mbps. This limit is explicitly defined in the datasheet's AC Electrical Characteristics table for the GCM+ grade, distinguishing it from the ECM variant rated to 42MHz.
Does the MAX9248GCM+ require external LVDS termination resistors?
No - the MAX9248GCM+ integrates 60kΩ internal bias resistors from IN+ and IN− to 1.2V, enabling direct AC-coupled connection to a 100Ω differential transmission line without external termination. External Thevenin termination is optional for noisy environments.
How does spread-spectrum control work on the MAX9248GCM+?
Spread-spectrum is controlled by the SS pin: high enables ±4% frequency deviation, low enables ±2%. Modulation rate scales linearly with REFCLK (e.g., 41.01kHz at 42MHz). A change triggers a 32,800×tT delay before outputs resume validity, as confirmed in Figure 17 of the MAX9248GCM+ datasheet.
Can the MAX9248GCM+ interface directly with 1.8V logic devices?
Yes - the MAX9248GCM+ features a dedicated VCCO supply pin (Pins 26, 38) that accepts 1.8V to 3.3V, allowing its RGB_OUT[17:0], CNTL_OUT[8:0], PCLK_OUT, DE_OUT, and LOCK outputs to drive 1.8V CMOS loads without level shifters.
What happens to outputs during loss-of-lock condition on the MAX9248GCM+?
When no transition word is detected within 222 PCLK_OUT cycles, LOCK goes high, all outputs except PCLK_OUT go low, and PCLK_OUT reverts to REFCLK. This behavior is documented in the "Lock and Loss-of-Lock" section and verified in Figure 8 of the MAX9248GCM+ datasheet.
MAX9248GCM+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Deserializer
- Data Rate:
- 756Mbps
- Input Type:
- LVDS
- Output Type:
- LVCMOS, LVTTL
- Number of Inputs:
- 1
- Number of Outputs:
- 27
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
MAX9248GCM+ FAQ
1.How can I place an order for MAX9248GCM+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9248GCM+ 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 MAX9248GCM+ reliable?
The price and inventory of MAX9248GCM+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9248GCM+ is usually 5 days.
3.What payment methods are accepted for MAX9248GCM+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9248GCM+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9248GCM+?
MAX9248GCM+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9248GCM+ 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 MAX9248GCM+?
For technical support, including MAX9248GCM+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9248GCM+ requirements.
6.How does Aetrix verify that MAX9248GCM+ is sourced from the original manufacturer or authorized distributors?
All MAX9248GCM+ 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 MAX9248GCM+ meets industry standards.
7.What is the process for return or replacement of MAX9248GCM+?
All MAX9248GCM+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9248GCM+, 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 MAX9248GCM+ part is unused and in its original packaging.
Return procedure for MAX9248GCM+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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