NXP Semiconductors TDA8295HN/C2,557

Overview

TDA8295HN/C2,557 from NXP Semiconductors is a digital multistandard low-IF PLL demodulator IC for analog TV and FM radio reception, supporting M/N, B/G/H, I, D/K, L, and L-accent standards with alignment-free synchronous demodulation. It integrates a 12-bit IF ADC (54 MHz/27 MHz), dual 10-bit DACs for CVBS and SSIF/mono audio, and internal PLL synthesizer with 16 MHz crystal oscillator capability. Designed for integration with NXP silicon tuners TDA8275A or TDA1827x, it enables compact PC TV and DVD recorder designs.

For engineers reviewing the TDA8295HN/C2,557 datasheet, TDA8295HN/C2,557 pinout, TDA8295HN/C2,557 application, or TDA8295HN/C2,557 equivalent, key selection considerations include its 40-pin HVQFN package, dual DAC outputs (CVBS + SSIF/audio), 48 dB digital IF AGC range, 62 dB weighted video S/N, and I2C-bus programmability with four selectable addresses - critical for multichip system integration and legacy TDA8290 upgrade paths.

Technical Context

The TDA8295HN/C2,557 performs full digital IF processing: symmetric 12-bit sampling of 1–10 MHz low-IF input, CORDIC-based AM/FM sound demodulation, and true synchronous video demodulation with active carrier regeneration. Its second-order PLL delivers ±830 kHz (extendable to ±1.66 MHz) pull-in range and robust lock under overmodulation or residual-carrier loss.

Internal architecture includes Nyquist filtering, standard-specific notch filters, group-delay equalization (20–40 ns ripple), and gated black-level or peak-search IF AGC with 68 dB control range. Clock generation supports both external 16 MHz reference (e.g., from TDA8275A) and on-chip crystal oscillator mode via XIN/XOUT pins.

Key Specifications

Pinout & Package

Package: 40-pin HVQFN (6 × 6 × 0.85 mm, SOT618-1), thermally enhanced, leadless, with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog TV demodulator applications.

Compared with TDA8295HN/C2,557, the TDA8290HN/C1,557 offers simpler integration but lower performance and higher external component count, while the SI2151-A10-GM trades architectural flexibility for higher integration density and reduced system-level complexity.

Availability

TDA8295HN/C2,557 is available at Aetrix Electronics and suitable for PC TV tuner cards, DVD recorders, and legacy analog TV receivers requiring stable component supply through extended product lifecycles.

Supply support for TDA8295HN/C2,557 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 headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The TDA8295HN/C2,557 belongs to NXP's legacy analog TV demodulator product line, designed specifically to enable alignment-free, multistandard broadcast reception in cost-sensitive consumer electronics with minimal external components.

FAQ

What is the primary function of the TDA8295HN/C2,557 in an analog TV system?

The TDA8295HN/C2,557 serves as a digital low-IF PLL demodulator that converts tuner-derived IF signals into baseband CVBS video and mono audio outputs. It handles all major analog TV standards (M/N, B/G/H, I, D/K, L, L-accent) and includes FM radio preprocessing. Its digital architecture eliminates manual alignment and external SAW filters, making it ideal for PC TV cards and DVD recorders where board space and calibration cost matter.

Does the TDA8295HN/C2,557 require an external crystal, or can it accept a clock input?

The TDA8295HN/C2,557 supports both modes: it can operate in slave mode by accepting a 16 MHz clock directly on the XIN pin (e.g., from NXP's TDA8275A tuner), or in oscillator mode with a 16 MHz fundamental crystal connected between XIN and XOUT. The internal PLL synthesizer then generates all required internal clocks, including the 54 MHz ADC sampling clock.

How does the TDA8295HN/C2,557 handle IF AGC, and what is its control range?

The TDA8295HN/C2,557 implements two IF AGC paths: a gated black-level detector synchronized to H/V PLL for stable video-level control, and a peak-search detector for fast transient response. Its internal digital logarithmic IF AGC amplifier provides −20 dB to +48 dB gain adjustment, delivering a total 68 dB control range - sufficient to maintain optimal ADC headroom across varying signal strengths and modulation depths.

Can the TDA8295HN/C2,557 replace the TDA8290 in existing designs?

Yes, the TDA8295HN/C2,557 is pin-compatible with the TDA8290HN/C1,557 and supports identical HVQFN40 packaging and I²C addressing. Firmware updates are minimal due to "easy programming" mode, which maps standard selection to a single register bit. This enables straightforward hardware upgrades while gaining benefits of digital IF processing, higher S/N, and FM radio capability.

What output interfaces does the TDA8295HN/C2,557 provide for video and audio?

The TDA8295HN/C2,557 provides differential current-mode outputs: V_IOUTP/V_IOUTN for CVBS video (10-bit, 108 MHz interpolated) and S_IOUTP/S_IOUTN for SSIF or mono audio (10-bit). These require simple external termination - 75 Ω for CVBS and 1 kΩ for audio - plus first-order RC low-pass filtering to suppress DAC images. No complex LCR networks are needed.