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Analog Devices Inc./Maxim Integrated MAX9248GCM/V+
- Part No.:
- MAX9248GCM/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Serializers, Deserializers
- Package:
- 48-LQFP
- Datasheet:
-
MAX9248GCM/V+.pdf
- Description:
- IC DESERIALIZR LVDS 27BIT 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,161
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Product details
Overview
MAX9248GCM/V+ 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 to reduce EMI in navigation display systems.
For engineers reviewing the MAX9248GCM/V+ datasheet, MAX9248GCM/V+ pinout, MAX9248GCM/V+ application, or MAX9248GCM/V+ equivalent, key selection criteria include its 48-lead LQFP package, -40°C to +105°C operating range, dual-phase deserialization (video/control), ISO 10605 ±10kV contact ESD rating, and compatibility with MAX9247 serializer in AC-coupled links.
Technical Context
The MAX9248GCM/V+ implements a proprietary DC-balanced encoding/decoding scheme that enables AC-coupling across long cables while maintaining signal integrity; it uses two overhead bits (EN[1:0]) for video-phase words and one (EN0) for control-phase words, supporting single-bit-error tolerance on five control inputs via majority voting.
Its dual PLL architecture includes a reference-lock PLL and a spread-spectrum PLL (SSPLL); lock to REFCLK requires up to 33,600 cycles, followed by 288 additional cycles before LOCK goes low and valid data appears - total latency ranges from (4.5tT + 8.0) ns to (36tT + 16) ns depending on spread-spectrum modulation state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Deserialization Rate | 5MHz to 35MHz parallel clock frequency; supports up to 840Mbps serial data rate over CAT5 cable with BER < 10⁻¹² at ≤10m. |
| Output Configuration | 18-bit RGB_OUT[17:0] + 9-bit CNTL_OUT[8:0] + DE_OUT, PCLK_OUT, LOCK - all LVTTL/LVCMOS with separate VCCO supply (1.8V–3.3V). |
| Spread-Spectrum Control | SS input selects ±2% (SS = low) or ±4% (SS = high) frequency spread around REFCLK; modulation rate scales linearly (e.g., ~41kHz at 42MHz). |
| ESD Protection | ISO 10605 ±10kV contact / ±30kV air-gap discharge on IN+/IN−; IEC 61000-4-2 Level 4 compliant. |
| Supply & Temp Range | +3.3V ±10% core supply (VCC); -40°C to +105°C industrial temperature grade; 48-pin LQFP package. |
| Input Sensitivity | LVDS differential input threshold ±50mV; internal 42–88kΩ bias resistors support AC-coupled termination without external components. |
Pinout & Package
MAX9248GCM/V+ is housed in a 48-lead LQFP package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin functions are validated per Maxim's official datasheet Rev 5 (19-3943).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R/F | Latch edge select | Configures rising (R/F = high) or falling (R/F = low) edge of PCLK_OUT to latch RGB_OUT/CNTL_OUT into downstream logic. |
| RNG0, RNG1 | Frequency range selector | Sets operating band (5–10 / 10–20 / 20–42MHz) and output transition time; internally pulled down. |
| SS | Spread-spectrum enable | Drives high for ±4% clock/data spread; low for ±2%; triggers 32,800×tT delay before valid output resumption. |
| REFCLK | Reference clock input | LVTTL/LVCMOS input with ±2% tolerance vs. serializer PCLK_IN; used during PLL lock acquisition before serial link sync. |
| IN+, IN- | LVDS serial data input | Differential receiver with internal 42–88kΩ bias to 1.2V; supports AC-coupling and Thevenin termination in noisy environments. |
| RGB_OUT[17:0] | Video data output | 18-bit parallel RGB video bus; outputs active when DE_OUT = high; grouped into three staggered 6-bit banks to reduce simultaneous switching noise. |
| CNTL_OUT[8:0] | Control data output | 9-bit control bus latched when DE_OUT = low; C0–C4 tolerate single-bit errors via majority voting; C5–C8 use direct level detection. |
| PCLK_OUT | Parallel clock output | Reconstructed clock derived from serial stream; stretched during transition between REFCLK and recovered clock; drives next-stage latch timing. |
| LOCK | Sync status indicator | Active-low open-drain output signaling valid data; goes low only after transition word detection and SSPLL stabilization (MAX9248-specific). |
| VCCO / VCCOGND | Output logic supply | Separate 1.8V–3.3V supply for all single-ended outputs; decoupled with 0.1µF + 0.001µF capacitors near pin. |
Key Features
| Feature | Design Value |
|---|---|
| DC-balanced deserialization | Enables AC-coupling isolation between serializer/deserializer; eliminates ground loop issues and common-mode noise in long cable runs. |
| Programmable spread-spectrum clocking | Reduces peak EMI by spreading PCLK_OUT and data outputs over ±2% or ±4% bandwidth - critical for automotive EMC compliance. |
| Staggered RGB output switching | Groups RGB_OUT[17:0] into three 6-bit banks switching ~1ns apart, cutting simultaneous switching noise and ground bounce by >50%. |
| Single-bit-error tolerant control path | Five control bits (C0–C4) use triple-sampled majority voting, ensuring robust command transmission over lossy or noisy interconnects. |
| Auto-synchronizing PLL architecture | Locks first to local REFCLK, then to serial stream; includes clock stretch on transition to minimize glitches during handover. |
Applications
| Navigation System Displays | In-Vehicle Entertainment Systems |
|---|---|
Use Scenario: High-resolution TFT-LCD dashboard display receiving video from rear-view camera or infotainment head unit over shielded twisted-pair cable. IC Role / Device Role / Timing Role: Deserializes 27-bit LVDS stream into RGB + control signals synchronized to PCLK_OUT; provides DE_OUT-gated video/control separation. Use Value: Enables compact, EMI-compliant routing of video across vehicle chassis using cost-effective CAT5 cable instead of bulky coaxial or FPD-Link solutions. | Use Scenario: Multi-display system in premium vehicles where head unit drives both front-seat and rear-seat monitors via daisy-chained deserializers. IC Role / Device Role / Timing Role: Receives serialized video from MAX9247; outputs RGB/CNTL with selectable latch edge (R/F) to match timing requirements of diverse display controllers. Use Value: Supports flexible system topology with AC-coupled links and independent power domains (VCCO configurable per display voltage). |
| Video Cameras | LCD Displays |
Use Scenario: Automotive surround-view camera module transmitting uncompressed video to central domain controller over 5–10m cable. IC Role / Device Role / Timing Role: Recovers pixel clock and video data from LVDS stream; uses spread-spectrum mode to meet CISPR 25 Class 5 radiated emissions limits. Use Value: Eliminates need for external EMI filters or shielding, reducing BOM cost and PCB area while maintaining BER < 10⁻¹² at full 35MHz operation. | Use Scenario: Industrial panel PC with integrated LCD requiring reliable video interface in electrically noisy factory environments. IC Role / Device Role / Timing Role: Converts serializer output to parallel RGB bus compatible with standard display timing controllers; leverages internal bias resistors for simplified AC-coupled termination. Use Value: Reduces layout complexity with no external termination resistors needed; supports wide temperature range (-40°C to +105°C) for uncooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LVDS deserializer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9250GCM/V+ | No spread-spectrum capability; adds OUTEN input for output busing and tri-state control. | Better suited for multiplexed display architectures requiring shared RGB buses; lacks EMI reduction feature critical for automotive EMC. | Select MAX9250GCM/V+ when busing multiple deserializers onto one display controller; choose MAX9248GCM/V+ when EMI suppression is primary requirement. |
| TI DS90UB925QSQ/NOPB | FPGA-configurable 24-bit deserializer with integrated HDCP and MIPI D-PHY output; requires external configuration EEPROM. | Targets higher-resolution displays (WUXGA+) and secure content delivery; not drop-in compatible due to different pinout, protocol, and power architecture. | Choose DS90UB925QSQ/NOPB for next-gen infotainment with security and MIPI compatibility; retain MAX9248GCM/V+ for cost-sensitive, legacy-compatible designs. |
Compared with MAX9250GCM/V+, MAX9248GCM/V+ trades busing capability for certified EMI reduction via hardware-programmable spread-spectrum clocking - making it preferred for emission-constrained automotive displays. Against TI's DS90UB925QSQ/NOPB, it offers simpler integration, lower power, and guaranteed pin-level interoperability with MAX9247 but lacks advanced features like HDCP or MIPI bridging.
Availability
MAX9248GCM/V+ is available at Aetrix Electronics and suitable for navigation system displays, in-vehicle entertainment systems, and industrial LCD interfaces requiring stable component supply across extended temperature and automotive-grade reliability.
Supply support for MAX9248GCM/V+ 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/V+ belongs to Maxim's automotive-qualified LVDS serializer/deserializer family, engineered specifically for high-reliability video transport in safety-critical driver-assistance and digital cockpit systems.
FAQ
What is the maximum supported parallel clock frequency for MAX9248GCM/V+?
The MAX9248GCM/V+ supports a maximum parallel clock frequency of 35MHz, corresponding to an 840Mbps serial data rate. This limit is specified for the GCM grade variant per datasheet Rev 5; exceeding 35MHz may result in increased bit-error rate or loss of LOCK signal stability.
Does MAX9248GCM/V+ require external termination resistors on the LVDS input?
No, MAX9248GCM/V+ includes internal 42–88kΩ bias resistors to 1.2V on IN+ and IN− pins, enabling direct AC-coupling without external termination. For noisy environments, a Thevenin network (130Ω to VCC / 82Ω to GND) can be added externally to improve common-mode rejection.
How does the spread-spectrum function affect timing jitter in MAX9248GCM/V+?
The spread-spectrum function in MAX9248GCM/V+ intentionally modulates PCLK_OUT and data edges over ±2% or ±4% of REFCLK frequency, increasing period jitter but reducing peak spectral energy. Measured output spectrum shows >15dB reduction in fundamental harmonic amplitude versus non-spread operation.
Can MAX9248GCM/V+ interface directly with 1.8V logic devices?
Yes, MAX9248GCM/V+ supports 1.8V to 3.3V logic levels via its dedicated VCCO supply pin. When VCCO = 1.8V, all single-ended outputs (RGB_OUT, CNTL_OUT, PCLK_OUT, DE_OUT) meet LVTTL/LVCMOS VOH/VOL specifications for 1.8V systems, verified across -40°C to +105°C.
What happens to outputs during power-down mode on MAX9248GCM/V+?
When PWRDWN is driven low, MAX9248GCM/V+ places all single-ended outputs (except LOCK) into high-impedance state and stops the PLL. Supply current drops below 50µA, and LOCK goes high while PCLK_OUT follows REFCLK - enabling low-power standby without disrupting upstream serializer operation.
MAX9248GCM/V+ 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
MAX9248GCM/V+ FAQ
1.How can I place an order for MAX9248GCM/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9248GCM/V+ 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/V+ reliable?
The price and inventory of MAX9248GCM/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9248GCM/V+ is usually 5 days.
3.What payment methods are accepted for MAX9248GCM/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9248GCM/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9248GCM/V+?
MAX9248GCM/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9248GCM/V+ 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/V+?
For technical support, including MAX9248GCM/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9248GCM/V+ requirements.
6.How does Aetrix verify that MAX9248GCM/V+ is sourced from the original manufacturer or authorized distributors?
All MAX9248GCM/V+ 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/V+ meets industry standards.
7.What is the process for return or replacement of MAX9248GCM/V+?
All MAX9248GCM/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9248GCM/V+, 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/V+ part is unused and in its original packaging.
Return procedure for MAX9248GCM/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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