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

NXP Semiconductors TDA9818T/V1,118

Name: TDA9818T/V1,118
Brand: NXP Semiconductors
SKU: TDA9818T/V1,118
Price: 2.40 USD
Availability: InStock
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Part No.:: TDA9818T/V1,118

Manufacturer:: NXP Semiconductors

Category:: Video Processing

Package:: 24-SOIC (0.295", 7.50mm Width)

Datasheet:: TDA9818T/V1,118.pdf

Description:: IC VIDEO DEMODULATOR 24SO

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Product details

Overview

TDA9818T/V1,118 from NXP Semiconductors (formerly Philips) is a multistandard VIF/SIF-PLL and FM-PLL/AM demodulator IC for analog TV signal processing. It supports B/G, M/N, and L/L' standards with 38.9 MHz, 45.75 MHz, and 58.75 MHz IFs; delivers 1.1 V_p-p CVBS output, 55–60 dB weighted S/N for video and FM audio, and operates from a single 5 V supply.

For engineers reviewing the TDA9818T/V1,118 datasheet, TDA9818T/V1,118 pinout, TDA9818T/V1,118 application in analog TV IF demodulation, or TDA9818T/V1,118 equivalent for multistandard broadcast receiver design, this page provides verified functional context, validated pin roles, confirmed video/audio performance specs, and real-world substitution guidance aligned to legacy PAL/SECAM/NTSC systems.

Technical Context

The TDA9818T/V1,118 integrates a true synchronous video demodulator with active carrier regeneration using a travelling wave divider (TWD), enabling linear demodulation and excellent pulse response. Its VIF amplifier employs three AC-coupled differential stages with emitter degeneration for gain control, while the FPLL uses dual-mode detection-frequency detector during acquisition and phase detector post-lock-with gated operation for over-modulation robustness (>105%).

It features separate PLL-controlled SIF processing paths: a single-reference QSS mixer for high-fidelity stereo sound and an intercarrier mode selectable via SIF2 grounding. The FM-PLL demodulator includes a 7-stage limiter and relaxation oscillator, delivering ±53 kHz frequency deviation and <0.5% THD at 27 kHz FM; AM demodulation is implemented via multiplier-based synchronous detection without external reference.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	5 V nominal (4.5–5.5 V range); enables direct compatibility with standard logic rails and simplifies power design in TV chassis.
Video Output (CVBS)	1.1 V_p-p (0.97–1.23 V); matches standard composite video interface levels for direct connection to video amplifiers or sync separators.
−3 dB Video Bandwidth	7–8 MHz (B/G & L); ensures full CCIR line 330 fidelity including chroma sideband support and minimal group delay distortion.
Weighted S/N (Video)	56–60 dB; meets broadcast-grade requirements for noise-limited picture quality under typical IF input conditions.
FM Audio S/N (weighted)	55–60 dB (B/G, 54% deviation); satisfies hi-fi audio performance targets for analog TV sound without external filtering.
Intermodulation Attenuation	58–64 dB at 1.1/3.3 MHz; suppresses cross-color artifacts and maintains color fidelity under multi-tone interference.
Harmonic Suppression	35–40 dB; reduces visible harmonics in composite video output, critical for stable sync and reduced dot crawl.

Pinout & Package

Package: SO24 - plastic small outline package, 24 leads, body width 7.5 mm (SOT137-1). RoHS-compliant lead finish, JEDEC MS-013 compliant footprint.

Pin/Terminal	Circuit Role	Design Meaning
VIF1 / VIF2	Differential vision IF input	Accepts AC-coupled 38.9/45.75/58.75 MHz IF signals; 2.2 kΩ differential impedance enables direct SAW filter interface.
SIF1 / SIF2	Differential sound IF input	Supports both QSS and intercarrier modes; internal AGC adjusts gain dynamically based on modulation type and standard.
CVBS	Composite video output	1.1 V_p-p buffered output with 10 Ω source impedance; drives 75 Ω coaxial lines directly without external termination.
AF	Audio frequency output	Rail-to-rail FM/AM audio output (0.4–0.6 V_rms); includes mute control path and de-emphasis switching via Cde-em.
VCO1 / VCO2	VCO resonance terminals	Connect external LC tank for double-carrier frequency generation; L/L' standard selection adjusts center frequency via LADJ.
STD	Standards selection input	Configures internal signal paths for B/G, M/N, or L/L' standards; determines video polarity, AGC timing, and demodulator coefficients.
TOP	Tuner AGC takeover point adjust	External resistor sets tuner gain reduction threshold to match SAW filter passband and optimize IF level stability.
QSS	Quasi-split sound output	Provides intercarrier signal for external stereo decoding; 140 mV_rms typical output with 9 MHz bandwidth supports hi-fi audio separation.

Key Features

Feature	Design Value
True synchronous video demodulation	Active carrier regeneration via TWD eliminates need for external crystal or PLL reference, reducing component count and improving linearity.
Gated phase detector for over-modulation	Enables >105% modulation tolerance in L/L' standards by disabling phase detection during sync pulses, preventing distortion on serrated signals.
Single-reference QSS mixer	Generates high-purity intercarrier signal from regenerated picture carrier, enabling stereo sound decoding without separate sound IF SAW filter.
Integrated tuner AGC with adjustable TOP	Open-collector TAGC output and TOP pin allow precise matching of tuner gain slope to SAW filter roll-off, ensuring optimal IF drive across temperature.
Alignment-free FM-PLL demodulator	Relaxation oscillator and integrated loop filter eliminate external components; achieves ±53 kHz deviation and <0.5% THD without tuning.

Applications

Legacy Analog TV Receivers	Multi-standard Broadcast Monitors
Use Scenario: PAL B/G, SECAM L, and NTSC M/N analog television receivers requiring full IF demodulation and stereo sound extraction. IC Role / Device Role / Timing Role: Primary VIF/SIF demodulator and video/audio baseband generator; handles all IF-to-baseband conversion, AGC, AFC, and standard-specific signal conditioning. Use Value: Single-chip solution eliminates discrete demodulators, filters, and reference oscillators-reducing BOM cost and board area by >40% versus discrete alternatives.	Use Scenario: Professional broadcast monitoring equipment supporting multiple regional TV standards in studio or field deployment. IC Role / Device Role / Timing Role: Multistandard IF processor with switchable STD pin and LADJ-adjustable VCO; provides consistent video timing, black level, and sync integrity across standards. Use Value: Maintains ≤±12% CVBS output voltage variation and ≤1.9% vertical black level tilt across B/G and L standards-ensuring accurate waveform analysis and compliance testing.
Terrestrial Set-Top Box IF Stages	Analog Cable TV Descramblers
Use Scenario: Legacy digital-to-analog converter boxes with analog passthrough for cable or terrestrial broadcast inputs. IC Role / Device Role / Timing Role: IF demodulator for analog channel output path; interfaces with tuner SAW filters and feeds CVBS/AF outputs to downstream encoders or modulators. Use Value: 50 dB SIF-VIF crosstalk attenuation prevents video artifacts from sound IF leakage, preserving image clarity during simultaneous analog/digital operation.	Use Scenario: Analog cable descramblers requiring high-fidelity video and stereo audio recovery from scrambled RF channels. IC Role / Device Role / Timing Role: Demodulator with robust AFC and fast AGC response (<1.8 ms for L standard decreasing steps); recovers stable baseband under noisy or weak-signal conditions. Use Value: Fast-mode AGC and gated PLL ensure uninterrupted video lock during channel changes or marginal signal conditions-critical for user experience in pay-TV hardware.

Legacy Analog TV Receivers

Multi-standard Broadcast Monitors

Use Scenario: PAL B/G, SECAM L, and NTSC M/N analog television receivers requiring full IF demodulation and stereo sound extraction.

IC Role / Device Role / Timing Role: Primary VIF/SIF demodulator and video/audio baseband generator; handles all IF-to-baseband conversion, AGC, AFC, and standard-specific signal conditioning.

Use Value: Single-chip solution eliminates discrete demodulators, filters, and reference oscillators-reducing BOM cost and board area by >40% versus discrete alternatives.

Use Scenario: Professional broadcast monitoring equipment supporting multiple regional TV standards in studio or field deployment.

IC Role / Device Role / Timing Role: Multistandard IF processor with switchable STD pin and LADJ-adjustable VCO; provides consistent video timing, black level, and sync integrity across standards.

Use Value: Maintains ≤±12% CVBS output voltage variation and ≤1.9% vertical black level tilt across B/G and L standards-ensuring accurate waveform analysis and compliance testing.

Terrestrial Set-Top Box IF Stages

Analog Cable TV Descramblers

Use Scenario: Legacy digital-to-analog converter boxes with analog passthrough for cable or terrestrial broadcast inputs.

IC Role / Device Role / Timing Role: IF demodulator for analog channel output path; interfaces with tuner SAW filters and feeds CVBS/AF outputs to downstream encoders or modulators.

Use Value: 50 dB SIF-VIF crosstalk attenuation prevents video artifacts from sound IF leakage, preserving image clarity during simultaneous analog/digital operation.

Use Scenario: Analog cable descramblers requiring high-fidelity video and stereo audio recovery from scrambled RF channels.

IC Role / Device Role / Timing Role: Demodulator with robust AFC and fast AGC response (<1.8 ms for L standard decreasing steps); recovers stable baseband under noisy or weak-signal conditions.

Use Value: Fast-mode AGC and gated PLL ensure uninterrupted video lock during channel changes or marginal signal conditions-critical for user experience in pay-TV hardware.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multistandard VIF/SIF demodulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA9818TS	SSOP24 package (5.3 mm width); higher thermal resistance (110 K/W vs. 85 K/W); identical electrical specs and pinout.	Preferred for space-constrained PCB layouts; requires rework of land pattern but no schematic change.	Select TDA9818TS when board real estate is limited and thermal management allows for higher junction-to-ambient resistance.
TDA9818	SDIP24 package (400 mil); through-hole mounting; same die, identical AC/DC characteristics, different mechanical form factor.	Used in legacy through-hole TV chassis designs; incompatible with SO24 footprint without adapter or redesign.	Choose TDA9818 only for through-hole assembly or repair of existing SDIP-based systems where SO24 reflow is not feasible.

Compared with TDA9818T/V1,118, the TDA9818TS offers identical functionality in a smaller SSOP package but demands tighter thermal design, while the TDA9818 provides drop-in replacement in through-hole systems-neither is pin-compatible with TDA9818T/V1,118 due to differing package geometries and soldering methods.

Availability

TDA9818T/V1,118 is available at Aetrix Electronics and suitable for legacy analog TV receiver manufacturing, broadcast monitor production, and analog cable descrambler refurbishment requiring stable component supply and long-term obsolescence mitigation.

Supply support for TDA9818T/V1,118 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

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions, automotive radar, and legacy analog broadcast ICs formerly developed by Philips.

The TDA9818T/V1,118 belongs to NXP's legacy TV signal processing product line, designed specifically for multistandard analog television IF demodulation in PAL, SECAM, and NTSC broadcast reception systems.

FAQ

What is the primary function of the TDA9818T/V1,118 in analog TV systems?

The TDA9818T/V1,118 serves as a multistandard VIF/SIF-PLL and FM-PLL/AM demodulator IC, performing full IF-to-baseband conversion for PAL B/G, SECAM L/L', and NTSC M/N television signals. It integrates vision IF amplification, synchronous video demodulation, sound IF processing, FM/AM audio demodulation, and system-level AGC/AFC functions-all within a single SO24 package. Its architecture eliminates external references and alignment components, making it central to analog TV receiver signal chains.

Does the TDA9818T/V1,118 support both QSS and intercarrier sound modes?

Yes, the TDA9818T/V1,118 supports both modes. In QSS mode, it uses regenerated picture carrier from the VCO to mix SIF into intercarrier frequency, delivering high-fidelity stereo-ready output at pin QSS. In intercarrier mode-which activates when SIF2 is grounded-it passes the composite IF through the vision SAW filter and performs quadrature detection, enabling simplified sound recovery without a dedicated SIF SAW. Both modes are internally selectable and maintain consistent audio S/N performance.

What are the key video performance metrics of the TDA9818T/V1,118?

The TDA9818T/V1,118 delivers 1.1 V_p-p CVBS output with 7–8 MHz −3 dB bandwidth, 56–60 dB weighted signal-to-noise ratio, and ≤±12% output voltage variation between B/G and L standards. It achieves 35–40 dB harmonic suppression and 58–64 dB intermodulation attenuation at 1.1/3.3 MHz-meeting CCIR line 330 requirements for differential gain (≤5%) and phase (≤2°). These metrics ensure broadcast-grade picture fidelity in multistandard analog TV receivers.

How does the TDA9818T/V1,118 handle over-modulation in L/L' standards?

The TDA9818T/V1,118 uses a gated phase detector architecture that disables phase detection during composite sync pulses in L/L' standards. This prevents distortion during over-modulated (up to >105%) video signals, particularly those with serration pulses. Combined with PLL-bandwidth control and fast AGC response (1.1–1.8 ms for decreasing VIF steps), the IC maintains stable video lock and low intermodulation distortion even under extreme modulation conditions common in SECAM transmission.

Can the TDA9818T/V1,118 be used in new designs today?

While the TDA9818T/V1,118 is a legacy part discontinued by NXP, Aetrix Electronics maintains active inventory and supply chain support for ongoing production and repair of analog TV infrastructure. It remains viable for certified legacy equipment maintenance, broadcast test gear, and niche analog video applications where functional equivalence and long-term availability are prioritized over modern integration. Designers should verify end-of-life status and plan for eventual migration to software-defined alternatives.

TDA9818T/V1,118 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: 24-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Demodulators

Applications:: -

Standards:: -

Control Interface:: Analog Voltage

Voltage - Supply:: 4.5V ~ 5.5V

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 24-SO

TDA9818T/V1,118 FAQ

1.How can I place an order for TDA9818T/V1,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA9818T/V1,118 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 TDA9818T/V1,118 reliable?

The price and inventory of TDA9818T/V1,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA9818T/V1,118 is usually 5 days.

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4.How is shipping managed for TDA9818T/V1,118?

TDA9818T/V1,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA9818T/V1,118 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 TDA9818T/V1,118?

For technical support, including TDA9818T/V1,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA9818T/V1,118 requirements.

6.How does Aetrix verify that TDA9818T/V1,118 is sourced from the original manufacturer or authorized distributors?

All TDA9818T/V1,118 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 TDA9818T/V1,118 meets industry standards.

7.What is the process for return or replacement of TDA9818T/V1,118?

All TDA9818T/V1,118 units undergo pre-shipment inspection (PSI). If there is an issue with TDA9818T/V1,118, 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 TDA9818T/V1,118 part is unused and in its original packaging.

Return procedure for TDA9818T/V1,118:

1.Submit a request within 90 days.

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

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