MAX9248GCM+

Serializers, Deserializers Overview

The MAX9248GCM+ is a 27-bit DC-balanced LVDS deserializer operating at parallel clock frequencies from 5MHz to 42MHz. It converts a single LVDS serial input into 18 bits of parallel video data and 9 bits of parallel control data. The device features programmable spread-spectrum output for EMI reduction, selectable rising or falling latch edges, and an internal PLL with ±2% reference clock tolerance. It operates on a +3.3V core supply with a separate VCCO supply supporting 1.8V to 3.3V logic levels. Packaged in a 48-lead LQFP, it supports industrial temperature ranges of -40°C to +85°C and -40°C to +105°C.

Serializers, Deserializers Feature Summary

• Proprietary data decoding provides DC balance and reduces electromagnetic interference.
• Programmable spread-spectrum capability allows output frequency variation of ±2% or ±4% relative to the reference clock.
• Control data is deserialized during video blanking periods using majority voting for single-bit-error tolerance.
• Staggered output switching groups RGB outputs to minimize ground bounce and EMI.

Serializers, Deserializers Applications

• Navigation system displays
• In-vehicle entertainment systems
• Video cameras
• LCD displays

Serializers, Deserializers Procurement Notes

Verify the specific suffix 'GCM+' against the manufacturer's current datasheet revision to confirm package type and temperature range. Confirm RoHS compliance status as manufacturing processes may change over time. Ensure the component matches the exact pinout and electrical specifications required for the target application design.

Serializers, Deserializers Selection Notes

Select this component when interfacing with a MAX9247 serializer for digital video transmission. Use the MAX9248 variant specifically if spread-spectrum functionality is required for EMI mitigation. Ensure the RNG inputs are configured correctly to match the serializer's parallel clock frequency range for proper output transition timing.

Serializers, Deserializers Part Context

This part belongs to the MAX9248/MAX9250 family of high-speed serial-to-parallel converters designed for automotive and industrial video applications. It pairs with the MAX9247 serializer to form a complete transmission link. The GCM+ designation indicates a specific lead-free, green plastic quad flatpack package configuration within the Maxim Integrated product line.

Serializers, Deserializers Replacement Considerations

The MAX9250GCM+ is a functional alternative that lacks spread-spectrum capabilities but includes an output enable pin for busing. Verify compatibility regarding EMI requirements and bus topology needs before substitution.

Serializers, Deserializers FAQ

How does the MAX9248 handle control data?

Control data is deserialized during the video blanking period. Inputs C0 through C4 utilize majority voting for error tolerance, while C5 through C8 are decoded directly.

What is the purpose of the SS input?

The SS input controls the spread-spectrum modulation. Driving it high enables ±4% frequency spread, while pulling it low enables ±2% spread to reduce EMI.

How is AC-coupling supported?

The device features internal bias resistors connected to +1.2V, allowing direct AC-coupling via capacitors to block ground shifts and common-mode noise.