NXP Semiconductors TDA9830T/V1,112

Overview

TDA9830T/V1,112 from NXP Semiconductors (formerly Philips) is a monolithic TV sound AM-demodulator and audio source switch IC designed for L- and L'-standard analog television receivers. It integrates a wideband synchronous AM demodulator (6–70 MHz IF bandwidth), low-noise audio mute/switch function, and dual-supply operation (5–8 V or 12 V). It delivers 500 mV RMS AF output with 53 dB S/N ratio (CCIR 468-3) and 90 dB mute attenuation.

For engineers reviewing the TDA9830T/V1,112 datasheet, TDA9830T/V1,112 pinout, TDA9830T/V1,112 application, or TDA9830T/V1,112 equivalent, this page provides verified functional context, validated pin roles, confirmed supply and signal-level specifications, and real-world design implications for legacy TV audio signal path implementation.

Technical Context

The TDA9830T/V1,112 implements a three-stage AC-coupled differential IF amplifier with current-distribution gain control (60–66 dB range, 10 mV/dB steepness) and a limiting amplifier + multiplier-based synchronous AM demodulator. Its AGC loop uses a mean-level detector with dual-mode discharge (5 µA slow, 5 mA fast) to stabilize demodulated output under varying IF levels.

The integrated audio switch features three-input op-amp architecture with internal biasing, supporting selection between internal AM demodulator output (pin 7), external audio source (pin 9), or mute state via digital control on pins 10 and 12. DC-plop is limited to 10 mV during switching, and input bias voltage at pins 7/9 matches the AMOUT DC level (2.15 V typ) to enable capacitor-free connection when acceptable.

Key Specifications

Pinout & Package

Package: SO16 (plastic small outline, 3.9 mm body width), SOT109-1 footprint per IEC/JEDEC MS-012AC standard. Thermal resistance R_{th j-a} = 100 K/W in free air.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar AM demodulator and audio switch applications.

Compared with TDA9830T/V1,112, the TDA9831T offers identical electrical behavior with enhanced thermal robustness, while the LA7555 trades dual-supply flexibility and integrated mute for lower BOM cost in fixed-voltage applications.

Availability

TDA9830T/V1,112 is available at Aetrix Electronics and suitable for analog TV receiver design, L/L′ broadcast demodulation, and legacy set-top box audio switching requiring stable component supply and long-term obsolescence support.

Supply support for TDA9830T/V1,112 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 company formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and consumer electronics.

The TDA9830T/V1,112 belongs to NXP's legacy TV signal processing product line, developed specifically for high-fidelity AM sound demodulation and seamless audio source switching in analog broadcast television systems.

FAQ

What is the primary function of the TDA9830T/V1,112 in analog TV systems?

The TDA9830T/V1,112 serves as a combined AM sound demodulator and audio source switch in analog TV receivers. It processes the 32.4 MHz sound IF signal using synchronous demodulation, then routes the resulting audio either from the internal demodulator (pin 7) or an external source (pin 9) to the final output (pin 8), with hardware-controlled mute (pin 12). Its design targets L- and L′-standard broadcast systems, delivering EN50049-compliant audio level and CCIR 468-3 S/N performance without external tuning components.

Can the TDA9830T/V1,112 operate from both 5 V and 12 V supplies simultaneously?

No - the TDA9830T/V1,112 must use only one supply at a time: either +5 to +8 V applied to pin 14 (Vp1), or +12 V applied to pin 11 (Vp2). The unused supply pin must remain unconnected. Internally, the 12 V supply is divided down to ~6 V to protect core circuitry, while the 5–8 V supply powers all blocks directly. Mixing supplies risks undefined operation or damage, as confirmed by the Absolute Maximum Ratings table specifying separate voltage limits for each pin.

What does the "V1,16" parameter represent in the TDA9830T/V1,112 datasheet?

The "V1,16" parameter in the TDA9830T/V1,112 datasheet refers to the RMS value of the differential sound IF input signal applied across pins 1 and 16. It specifies minimum sensitivity (60 µV RMS for −3 dB AF reduction) and maximum handling capability (120 mV RMS), defining the usable dynamic range of the IF amplifier stage. This parameter is critical for matching the preceding IF filter and ensuring optimal AGC loop response and demodulation fidelity across varying broadcast signal strengths.

How is mute functionality implemented in the TDA9830T/V1,112?

Mute functionality in the TDA9830T/V1,112 is implemented via pin 12 (MUTE), which accepts TTL-compatible logic levels: 0–0.8 V activates mute (≥80 dB attenuation), and 1.5–V_P disables it. When active, the audio switch disconnects both input paths and grounds the output stage, achieving ≥90 dB crosstalk and mute attenuation across 20 Hz–20 kHz. This hardware-controlled mute avoids software latency and ensures clean, pop-free muting during channel changes or standby transitions in TV systems using the TDA9830T/V1,112.

Is the TDA9830T/V1,112 pin-compatible with the TDA9831T?

Yes - the TDA9830T/V1,112 is fully pin-compatible with the TDA9831T. Both share identical pin configuration, electrical characteristics, and functional block diagram. The TDA9831T extends the operating ambient temperature range from 0–70°C (TDA9830T/V1,112) to −25–+85°C and updates the qualification status, but requires no PCB layout or schematic changes. Engineers may substitute TDA9831T for TDA9830T/V1,112 in new designs targeting wider thermal environments, retaining full signal integrity and timing behavior.