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Analog Devices Inc./Maxim Integrated MAX9247GCM+
- Part No.:
- MAX9247GCM+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Serializers, Deserializers
- Package:
- 48-LQFP
- Datasheet:
-
MAX9247GCM+.pdf
- Description:
- IC SERIALIZER LVDS 48-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:838
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Product details
Overview
The MAX9247GCM+ from Maxim Integrated is a 27-bit, DC-balanced LVDS serializer that converts 18-bit RGB video and 9-bit control data into a single high-speed serial stream for automotive display links. It operates at 2.5MHz–42MHz parallel clock frequencies, features integrated 100Ω LVDS termination, preemphasis for signal integrity, and supports AC-coupled operation over shielded twisted-pair (STP) cables up to 10m. It pairs with MAX9248/MAX9250 deserializers in navigation system displays and in-vehicle entertainment systems.
For engineers reviewing the MAX9247GCM+ datasheet, MAX9247GCM+ pinout, MAX9247GCM+ application, or MAX9247GCM+ equivalent, key selection criteria include its -40°C to +105°C automotive-grade temperature range, 48-lead LQFP package, programmable frequency-range selection (RNG[1:0]), ISO 10605 ±10kV contact ESD rating, and support for both 2- and 4-capacitor AC-coupling configurations.
Technical Context
The MAX9247GCM+ implements a proprietary DC-balanced encoding scheme that embeds 2 overhead bits (EN0/EN1) in 20-bit video words and 1 overhead bit in 19-bit control words, enabling EMI reduction and AC-coupling compatibility. Its PLL locks to the PCLK_IN reference with 17,100-cycle lock time and tolerates ±2% clock deviation.
It features dual supply domains: VCCIN (1.71V–3.6V) powers all single-ended inputs including RGB_IN[17:0], CNTL_IN[8:0], DE_IN, and PCLK_IN; VCCPLL and VCCLVDS are isolated supplies for PLL and LVDS output stages respectively. The CMF pin enables optional common-mode filtering via external capacitor to ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Parallel Clock Range | 2.5MHz to 42MHz - defines maximum video bandwidth and determines serial data rate (50–840Mbps) |
| Differential Output Voltage (VOD) | 250–450mV - ensures robust LVDS signaling across 100Ω termination with sufficient noise margin |
| Operating Temperature | -40°C to +105°C - qualified for under-hood and display-module environments in automotive applications |
| ESD Protection | ±10kV contact (ISO 10605) - protects LVDS outputs against real-world cable-handling discharge events |
| Supply Current (42MHz) | 70mA max with preemphasis - enables thermal design for continuous high-speed video streaming |
| Serializer Delay | 3.10 × tT + 8.0ns - deterministic latency critical for timing-critical display synchronization |
| Peak-to-Peak Jitter | 150ps - maintains bit-error rate <10⁻¹² over 10m CAT5 cable at 42MHz |
Pinout & Package
The MAX9247GCM+ is housed in a 48-lead LQFP package (7mm × 7mm, 0.5mm pitch) with exposed pad for thermal dissipation. Pin assignments follow standard Maxim LQFP layout with dedicated ground domains (GND, PLLGND, LVDSGND), separate supply rails (VCCIN, VCC, VCCPLL, VCCLVDS), and functional grouping of RGB/CTL inputs, control pins (DE_IN, PCLK_IN, RNG[1:0], PRE, PWRDWN), and LVDS outputs (OUT+, OUT-, CMF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,13,37) | Digital input buffer and core ground | Common reference for RGB_IN, CNTL_IN, and logic inputs; requires low-inductance decoupling |
| VCCIN (Pin 2) | Input buffer supply | Configurable 1.71V–3.6V rail enabling interface to 1.8V/2.5V/3.3V logic without level shifters |
| RGB_IN[17:0] (Pins 3–10,39–48) | Video data inputs | 18-bit parallel RGB latch on rising PCLK_IN edge when DE_IN = high; internally pulled down |
| CNTL_IN[8:0] (Pins 11,12,15–21) | Control data inputs | 9-bit parallel control bus latched when DE_IN = low; C0–C4 are single-bit-error tolerant |
| DE_IN (Pin 22) | Data-enable control | Switches between video and control phases; must toggle for proper transition-word insertion |
| PCLK_IN (Pin 23) | Parallel clock input | Provides latch timing and PLL reference; drives internal 17,100-cycle lock sequence |
| RNG0/RNG1 (Pins 35,36) | Frequency range select | Set operating band (2.5–5MHz to 20–42MHz); determines PLL loop bandwidth and jitter performance |
| PRE (Pin 25) | Preemphasis enable | Activates 40–50% amplitude boost during transitions to improve eye opening over lossy STP |
| PWRDWN (Pin 28) | Power-down control | Halts PLL, disables 100Ω termination, and places LVDS outputs in high-Z state (<50µA ICCZ) |
| CMF (Pin 29) | Common-mode filter node | Connects to ground via capacitor to suppress switching noise on LVDS common-mode voltage |
| LVDSGND (Pins 30,31) | LVDS output ground | Isolated analog ground for LVDS driver; must be separated from digital GND to minimize noise coupling |
| OUT+/OUT- (Pins 32,33) | Differential LVDS outputs | Internally terminated 100Ω differential pair; supports AC-coupling with 0.1µF–39nF capacitors |
| VCCLVDS (Pin 34) | LVDS output supply | 3.3V rail for LVDS driver stage; bypassed separately to LVDSGND for clean common-mode voltage |
Key Features
| Feature | Design Value |
|---|---|
| DC-balanced proprietary encoding | Enables AC-coupling isolation and eliminates baseline wander over long STP runs |
| Programmable phase-shifted LVDS signaling | Reduces spectral EMI peaks by spreading energy across harmonics without increasing bandwidth |
| Integrated 100Ω LVDS termination | Eliminates external resistors and PCB layout sensitivity while maintaining impedance matching |
| Five single-bit-error-tolerant control inputs (C0–C4) | Ensures robust recovery of critical sync signals (HSYNC/VSYNC) even with bit errors on cable |
| Worst-case 10m STP cable drive | Validated BER <10⁻¹² over 2-meter CAT5 at 42MHz; extends to 10m with preemphasis enabled |
| Separate VCCIN supply domain | Allows direct interfacing to 1.8V FPGA I/O banks without level-shifter ICs or voltage dividers |
Applications
| Navigation System Displays | In-Vehicle Entertainment Systems |
|---|---|
Use Scenario: High-resolution TFT-LCD display in automotive head-unit with graphics processor driving RGB888 interface. IC Role / Device Role / Timing Role: Serializer converting parallel RGB and HSYNC/VSYNC/DE signals into single LVDS stream for ECU-to-display cable harness. Use Value: Reduces 27-wire ribbon cable to 2-wire STP, cutting weight, cost, and EMI emissions while supporting 1080p@60Hz video timing. |
Use Scenario: Rear-seat entertainment display receiving HDMI-to-LVDS converted video from media player. IC Role / Device Role / Timing Role: Video link serializer handling embedded control data (audio mute, brightness) alongside video pixels. Use Value: Enables single-cable transmission of video + bidirectional control over 8m shielded cable with <10⁻¹² BER. |
| Video Cameras | LCDs |
Use Scenario: Automotive surround-view camera module transmitting raw Bayer or YUV video to ADAS processor. IC Role / Device Role / Timing Role: Serializer mapping sensor pixel data and metadata (exposure, gain) onto shared serial link with minimal latency. Use Value: Supports 2.5MHz–42MHz clock flexibility to match diverse image sensors; preemphasis maintains SNR over flex-cable routing. |
Use Scenario: Industrial panel PC with integrated LCD requiring noise-immune video interface from ARM-based SoC. IC Role / Device Role / Timing Role: Bridge between SoC's parallel RGB interface and LCD's LVDS receiver, providing DC balance for long interconnects. Use Value: Eliminates need for external AC-coupling capacitors on SoC side; integrated termination simplifies PCB layout and reduces BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LVDS serializer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9247ECM+ | Same silicon, rated for -40°C to +85°C only; identical pinout, timing, and electrical specs | Suitable for cabin-mounted infotainment units but not under-hood or display modules requiring +105°C operation | Select MAX9247ECM+ only if ambient temperature stays below +85°C and automotive qualification is not required. |
| MAX9275GTJ+ | Higher-speed 36-bit serializer (up to 100MHz PCLK); different pinout, 56-TQFN package, no RNG[1:0] frequency select | Targets 4K display interfaces; lacks single-bit-error tolerance on control inputs and has no CMF pin | Choose MAX9275GTJ+ only when >42MHz bandwidth or higher data density is needed; not drop-in compatible. |
Compared with MAX9247ECM+, the MAX9247GCM+ adds extended temperature capability critical for display modules near heat sources; compared with MAX9275GTJ+, it offers superior noise immunity via preemphasis and CMF filtering but at lower maximum data rate.
Availability
MAX9247GCM+ is available at Aetrix Electronics and suitable for automotive navigation systems, in-vehicle entertainment subsystems, and industrial LCD interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX9247GCM+ 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, with emphasis on high-reliability, low-noise, and thermally robust solutions.
The MAX9247GCM+ belongs to Maxim's automotive-qualified high-speed serial link product line, engineered specifically for noise-immune video transport in harsh EMI environments like vehicle cabins and engine compartments.
FAQ
What is the maximum supported parallel clock frequency for the MAX9247GCM+?
The MAX9247GCM+ supports a maximum parallel clock frequency of 42MHz, enabling serial data rates up to 840Mbps. This limit is defined by the device's internal PLL architecture and timing margins validated across the full -40°C to +105°C operating range. At 42MHz, the serializer delivers worst-case supply current of 70mA with preemphasis enabled and maintains peak-to-peak jitter ≤150ps.
How does the MAX9247GCM+ achieve DC balance for AC-coupling?
The MAX9247GCM+ achieves DC balance through proprietary encoding: video data uses 20-bit words with 2 overhead bits (EN0/EN1), and control data uses 19-bit words with 1 overhead bit (EN0). This ensures equal numbers of 1s and 0s over time, preventing baseline drift. Combined with the ability to AC-couple via series capacitors on OUT+/OUT-, this allows galvanic isolation between transmitter and receiver grounds.
Which deserializers are compatible with the MAX9247GCM+?
The MAX9247GCM+ is designed to pair with the MAX9248 and MAX9250 deserializers, forming a complete bidirectional video link. For clock frequencies below 35MHz, it can also interoperate with the MAX9218. All three deserializers recognize the same encoded word formats, transition sequences, and control-data mapping, ensuring interoperability without protocol translation.
What is the function of the CMF pin on the MAX9247GCM+?
The CMF (Common-Mode Filter) pin on the MAX9247GCM+ connects to the midpoint of the internal 100Ω LVDS termination network. By adding an external capacitor from CMF to LVDSGND, designers suppress common-mode switching noise generated by the LVDS driver, reducing radiated EMI by up to 10dB. Typical values range from 0.1µF (for <18MHz) to 39nF (for 42MHz), per Maxim's Figure 14.
Does the MAX9247GCM+ require external termination resistors?
No, the MAX9247GCM+ integrates a matched 100Ω differential termination resistor between OUT+ and OUT-. This eliminates the need for external resistors and associated PCB layout complexity. The termination is automatically switched out when PWRDWN is driven low or when VCC is absent, placing the outputs in high-impedance state to prevent signal contention during power sequencing.
MAX9247GCM+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Serializer
- Data Rate:
- 756Mbps
- Input Type:
- LVCMOS, LVTTL
- Output Type:
- LVDS
- Number of Inputs:
- 27
- Number of Outputs:
- 1
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
MAX9247GCM+ FAQ
1.How can I place an order for MAX9247GCM+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9247GCM+ 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 MAX9247GCM+ reliable?
The price and inventory of MAX9247GCM+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9247GCM+ is usually 5 days.
3.What payment methods are accepted for MAX9247GCM+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9247GCM+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9247GCM+?
MAX9247GCM+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9247GCM+ 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 MAX9247GCM+?
For technical support, including MAX9247GCM+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9247GCM+ requirements.
6.How does Aetrix verify that MAX9247GCM+ is sourced from the original manufacturer or authorized distributors?
All MAX9247GCM+ 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 MAX9247GCM+ meets industry standards.
7.What is the process for return or replacement of MAX9247GCM+?
All MAX9247GCM+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9247GCM+, 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 MAX9247GCM+ part is unused and in its original packaging.
Return procedure for MAX9247GCM+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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