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Home > Products > Integrated Circuits (ICs) > Linear > Video Processing

Semtech Corporation GS4982-CTAE3

Name: GS4982-CTAE3
Brand: Semtech Corporation
SKU: GS4982-CTAE3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: GS4982-CTAE3

Manufacturer:: Semtech Corporation

Category:: Video Processing

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: GS4982-CTAE3.pdf

Description:: IC VIDEO SYNC SEPARATOR 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

GS4982-CTAE3 from Gennum is a precision video sync separator IC designed to extract horizontal, vertical, back porch, and odd/even field timing signals from NTSC, PAL, and SECAM composite video inputs. It delivers ±5ns temperature stability over 0°C to 70°C, supports 0.5V–4.0V_pp input amplitude with +5V supply, provides horizontal sync output on Pin 1, and operates across +4.5V to +13.2V supply range - used in broadcast-grade video processing, professional monitors, and legacy analog video capture systems.

For engineers reviewing the GS4982-CTAE3 datasheet, pinout, applications, or equivalent options, this page details its 50% sync slicing architecture, noise-immune signal detection, RSET-based timing current control, horizontal sync delay (420 ns typ), and Pb-free SOIC-8 packaging - all critical for analog video timing integrity in industrial and broadcast equipment design.

Technical Context

The GS4982-CTAE3 implements a dual-mode input clamp (Hard/Soft) to maintain 50% sync slicing accuracy within ±5%, using internal color burst filtering (>15 dB attenuation at 3.58 MHz) and an integrated hold circuit for precise back porch voltage derivation. Its frequency-to-voltage converter validates input scan rate (15.7 ± 4 kHz) to enable robust signal detection and output muting.

Timing generation relies on an external RSET resistor (227 kΩ for NTSC) to set internal currents, enabling stable horizontal sync output (8.0 μs pulse width, 420 ns delay), vertical sync (197.7 μs fixed width), and back porch (2.5 μs width, 525 ns delay from sync rising edge) - all synchronized via windowing circuitry that rejects impulse noise during equalizing intervals.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	+4.5 V to +13.2 V - supports wide-input analog video systems with single-supply flexibility.
Input Signal Amplitude	0.5 V to 4.0 V_pp - accommodates degraded or amplified composite video without external gain staging.
Horizontal Sync Delay	420 ns typical - ensures deterministic timing alignment with active video lines in NTSC/PAL decoding pipelines.
Temperature Stability	±5 ns over 0°C to 70°C - guarantees sub-pixel timing consistency in unregulated thermal environments.
Color Burst Attenuation	15 dB typical at 3.58 MHz - suppresses chroma interference to prevent false sync edge detection.
Output Mute Probation Period	2.5 ms typical - prevents spurious outputs during brief video dropouts while maintaining system responsiveness.
RSET Reference Voltage	1.24 V typical - enables accurate current-setting for timing circuits using standard 227 kΩ resistor.

Pinout & Package

GS4982-CTAE3 is housed in an 8-pin SOIC package (JEDEC MS-012AC), Pb-free and RoHS-compliant, with 1.27 mm pitch and 4.9 mm × 3.9 mm body dimensions.

Pin/Terminal	Circuit Role	Design Meaning
1	Horizontal Sync Output	Active-low TTL-compatible pulse (8.0 μs width, 420 ns delay) for horizontal line synchronization in decoder ASICs or FPGA video controllers.
2	Composite Video Input	AC-coupled input accepting 0.5–4.0 V_pp; internally clamped to 1.55 V sync tip level for precise 50% slicing.
3	Vertical Sync Output	Fixed-width (197.7 μs) logic-level pulse marking field boundaries - derived via true integrator for noise immunity.
4	Ground	Dedicated analog ground reference for low-noise sync extraction and internal comparator stability.
5	Back Porch Output	Negative-going pulse delayed 525 ns from sync rising edge; gated by BPEN to maintain horizontal rate during vertical interval.
6	RSET	Resistor connection point (227 kΩ for NTSC) setting all internal timing currents - directly controls jitter performance.
7	Odd/Even Output	Logic-high = odd field, logic-low = even field; determined by comparing vertical sync to internal horizontal sync - immune to pre-equalizing noise.
8	Vcc	Positive supply input (+4.5 V to +13.2 V); powers analog front-end, digital logic, and output drivers with <10 mA total consumption.

Key Features

Feature	Design Value
Precision 50% sync slicing	Minimizes time base errors caused by sync amplitude variation - maintains constant delay (t_O + t_D) regardless of input level.
Internal color burst filter	Reduces external component count by >15 dB attenuation at 3.58 MHz - eliminates need for discrete bandpass filters.
Dual-mode input clamp	Soft clamp maintains ±5% slicing accuracy in steady state; hard clamp + Nosync Recovery Current (30 μA typ) enables fast impulse recovery (<120 ns).
Robust signal detection	Frequency-to-voltage converter validates horizontal scan rate (15.7 ± 4 kHz); mutes outputs after 2.5 ms probation if invalid signal detected.
Back porch enable (BPEN)	Windowing circuit forces back porch output at horizontal rate during vertical interval - prevents doubling artifacts in NTSC/PAL decoding.

Applications

Broadcast Video Processing	Professional Monitor Timing Control
Use Scenario: Extracting timing references from baseband NTSC/PAL feeds in master control rooms and distribution amplifiers. IC Role / Device Role / Timing Role: GS4982-CTAE3 serves as primary sync separator, generating horizontal sync for genlock, vertical sync for frame alignment, and odd/even for interlaced display control. Use Value: ±5 ns temperature stability and 50% slicing ensure pixel-accurate timing across rack-mounted equipment operating at ambient temperatures up to 70°C.	Use Scenario: Driving high-resolution CRT and LCD video monitors requiring precise horizontal and vertical retrace timing. IC Role / Device Role / Timing Role: GS4982-CTAE3 provides clean horizontal sync (Pin 1), vertical sync (Pin 3), and back porch (Pin 5) to monitor timing ICs or FPGA video controllers. Use Value: Internal color burst filtering and impulse-noise-immune windowing circuitry eliminate sync glitches during cable hot-plug or ESD events.
Legacy Analog Video Capture	Video Test Equipment
Use Scenario: Digitizing analog video sources in PCIe-based frame grabbers and USB3 vision cameras. IC Role / Device Role / Timing Role: GS4982-CTAE3 supplies horizontal and vertical timing strobes to ADC sampling clocks and FIFO write-enable logic. Use Value: 0.5–4.0 V_pp input range accommodates variable-amplitude legacy sources without manual gain adjustment or clipping risk.	Use Scenario: Generating reference sync waveforms in video signal analyzers and waveform monitors. IC Role / Device Role / Timing Role: GS4982-CTAE3 acts as a calibrated sync source - its 525 ns back porch delay and 197.7 μs vertical pulse serve as traceable timing benchmarks. Use Value: Fixed-width vertical output and RSET-controlled timing enable repeatable measurements across calibration cycles and units.

Broadcast Video Processing

Professional Monitor Timing Control

Use Scenario: Extracting timing references from baseband NTSC/PAL feeds in master control rooms and distribution amplifiers.

IC Role / Device Role / Timing Role: GS4982-CTAE3 serves as primary sync separator, generating horizontal sync for genlock, vertical sync for frame alignment, and odd/even for interlaced display control.

Use Value: ±5 ns temperature stability and 50% slicing ensure pixel-accurate timing across rack-mounted equipment operating at ambient temperatures up to 70°C.

Use Scenario: Driving high-resolution CRT and LCD video monitors requiring precise horizontal and vertical retrace timing.

IC Role / Device Role / Timing Role: GS4982-CTAE3 provides clean horizontal sync (Pin 1), vertical sync (Pin 3), and back porch (Pin 5) to monitor timing ICs or FPGA video controllers.

Use Value: Internal color burst filtering and impulse-noise-immune windowing circuitry eliminate sync glitches during cable hot-plug or ESD events.

Legacy Analog Video Capture

Video Test Equipment

Use Scenario: Digitizing analog video sources in PCIe-based frame grabbers and USB3 vision cameras.

IC Role / Device Role / Timing Role: GS4982-CTAE3 supplies horizontal and vertical timing strobes to ADC sampling clocks and FIFO write-enable logic.

Use Value: 0.5–4.0 V_pp input range accommodates variable-amplitude legacy sources without manual gain adjustment or clipping risk.

Use Scenario: Generating reference sync waveforms in video signal analyzers and waveform monitors.

IC Role / Device Role / Timing Role: GS4982-CTAE3 acts as a calibrated sync source - its 525 ns back porch delay and 197.7 μs vertical pulse serve as traceable timing benchmarks.

Use Value: Fixed-width vertical output and RSET-controlled timing enable repeatable measurements across calibration cycles and units.

Equivalent & Alternatives

The following parts are listed as comparable options for similar video sync separation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
GS4982-CKAE3	Same die, identical electrical specs, but supplied in SOIC tube (not tape-and-reel); no functional difference from GS4982-CTAE3.	Preferred for low-volume prototyping or manual assembly where tape feed is unnecessary.	Select GS4982-CKAE3 only when reel packaging is not required for SMT line integration.
LM1881N/NOPB	Lacks horizontal sync output; provides only composite, vertical, and blanking outputs; no 50% slicing or color burst filtering; ±20 ns temp stability.	Suitable for basic sync extraction where horizontal timing is not needed and noise immunity is secondary.	Choose LM1881N/NOPB only for cost-sensitive, non-broadcast applications with relaxed timing and noise requirements.

Compared with GS4982-CTAE3, GS4982-CKAE3 offers identical performance in tube packaging for lab use, while LM1881N/NOPB trades horizontal sync capability, 50% slicing precision, and burst filtering for lower cost and wider availability - making it viable only where sub-10 ns stability and NTSC/PAL-specific robustness are not required.

Availability

GS4982-CTAE3 is available at Aetrix Electronics and suitable for broadcast infrastructure, professional video monitors, legacy analog capture systems, and video test instrumentation requiring stable component supply across extended production lifecycles.

Supply support for GS4982-CTAE3 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

Gennum Corporation was a Canadian semiconductor company specializing in high-performance analog and mixed-signal ICs for video, communications, and timing applications before its acquisition by Microchip Technology in 2012.

The GS4982-CTAE3 belongs to Gennum's video sync separator product line, engineered specifically for broadcast-grade NTSC/PAL/SECAM timing extraction with emphasis on noise immunity, temperature stability, and minimal external component count.

FAQ

What is the function of Pin 6 (RSET) on the GS4982-CTAE3?

Pin 6 (RSET) sets all internal timing currents in the GS4982-CTAE3 via an external resistor. For standard NTSC operation, a 227 kΩ resistor is required to achieve optimal jitter performance and correct horizontal/vertical timing. The RSET reference voltage is 1.24 V typical, and deviation from this value directly impacts sync pulse width and delay accuracy across all outputs.

Does the GS4982-CTAE3 support both NTSC and PAL video standards?

Yes, the GS4982-CTAE3 supports NTSC, PAL, and SECAM composite video standards. Its internal frequency-to-voltage converter validates horizontal scan rate (15.7 ± 4 kHz for NTSC; 15.625 ± 4 kHz for PAL), and its dual-mode clamp, color burst filter, and integrator-based vertical detection ensure consistent sync extraction across all three standards without configuration changes.

How does the GS4982-CTAE3 handle missing or noisy video input?

The GS4982-CTAE3 uses a two-stage signal detection mechanism: first, a frequency-to-voltage converter checks horizontal scan rate validity; second, a probation timer (2.5 ms typical) triggers output muting to logic-high if no valid signal returns. Upon restoration, it requires eight consecutive valid video lines before re-enabling outputs - preventing glitch propagation in video processing chains.

What is the purpose of the internal color burst filter in the GS4982-CTAE3?

The internal color burst filter in the GS4982-CTAE3 attenuates the 3.58 MHz (NTSC) or 4.43 MHz (PAL) chroma subcarrier by ≥15 dB to prevent spurious edges from corrupting sync pulse detection. This eliminates the need for external LC or ceramic filters, reduces board space, and improves noise immunity - especially critical in multi-source switching environments where burst leakage could cause timing errors.

Can the GS4982-CTAE3 be used in place of the GS4882-CTAE3?

No - the GS4982-CTAE3 and GS4882-CTAE3 are functionally distinct: GS4982-CTAE3 outputs horizontal sync on Pin 1, while GS4882-CTAE3 outputs composite sync on Pin 1. Their pinouts differ at Pin 1, and neither is pin-compatible. Substitution requires PCB redesign and firmware adaptation to accommodate the different sync signal type and associated timing constraints.

GS4982-CTAE3 Specifications

Product attributes: Attribute value

Manufacturer:: Semtech Corporation

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Separator

Applications:: Professional Video

Standards:: NTSC, PAL, SECAM

Control Interface:: Serial

Voltage - Supply:: 4.5V ~ 13.2V

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 8-SOIC

GS4982-CTAE3 FAQ

1.How can I place an order for GS4982-CTAE3 through Aetrix?

Please submit a Request for Quotation (RFQ) for GS4982-CTAE3 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 GS4982-CTAE3 reliable?

The price and inventory of GS4982-CTAE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for GS4982-CTAE3 is usually 5 days.

3.What payment methods are accepted for GS4982-CTAE3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for GS4982-CTAE3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for GS4982-CTAE3?

GS4982-CTAE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your GS4982-CTAE3 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 GS4982-CTAE3?

For technical support, including GS4982-CTAE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your GS4982-CTAE3 requirements.

6.How does Aetrix verify that GS4982-CTAE3 is sourced from the original manufacturer or authorized distributors?

All GS4982-CTAE3 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 GS4982-CTAE3 meets industry standards.

7.What is the process for return or replacement of GS4982-CTAE3?

All GS4982-CTAE3 units undergo pre-shipment inspection (PSI). If there is an issue with GS4982-CTAE3, 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 GS4982-CTAE3 part is unused and in its original packaging.

Return procedure for GS4982-CTAE3:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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