NXP Semiconductors TDA18271HD/C2,557

Overview

TDA18271HD/C2,557 from NXP Semiconductors is a silicon-based TV tuner IC designed for terrestrial analog and digital TV reception. It integrates RF tracking filters, IF selectivity, and dual-tuner synchronization logic, delivers low-IF output (1.5–8 MHz), supports worldwide TV standards (DVB-T, ATSC, ISDB-T, PAL/SECAM/NTSC), and operates from a single 3.3 V supply with 780 mW typical power dissipation.

For engineers reviewing the TDA18271HD/C2,557 datasheet, TDA18271HD/C2,557 pinout, TDA18271HD/C2,557 application, or TDA18271HD/C2,557 equivalent, key selection considerations include its integrated 16 MHz crystal oscillator buffer, slave tuner output (STO) and loop-through (LT) capability, I²C-bus interface compatibility with both 3.3 V and 5 V microcontrollers, and three configurable standby modes including device-off.

Technical Context

The TDA18271HD/C2,557 implements dual PLL architecture: a main synthesizer for RF-to-IF downconversion and a calibration synthesizer for on-chip RF tracking filter and image rejection tuning. Its polyphase RF and IF filters enable high image rejection (65 dB) without external SAW components.

It supports master/slave dual-tuner configuration via XTOUT_MS pin voltage selection (0–0.1V_CC = master, 0.4–0.6V_CC = slave), uses internal regulators for VCO and RF AGC decoupling, and provides programmable IF output levels (0–12 dB attenuation) and gain taper control across 32 steps.

Key Specifications

Pinout & Package

Package: HLQFN64R - plastic thermal-enhanced low-profile quad flat package, 9 × 9 × 1.6 mm body, 64-terminal no-lead construction (SOT903-1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar silicon tuner applications.

Compared with MAX3543ETJ+ and SI2151-A10-GM, the TDA18271HD/C2,557 uniquely combines analog/digital/ FM multimode support, dual-tuner synchronization, and full IF filtering in one die-enabling hybrid broadcast receivers without external SAWs or clock buffers.

Availability

TDA18271HD/C2,557 is available at Aetrix Electronics and suitable for hybrid TV/FM receivers, dual-tuner PCTV systems, compact set-top boxes, and broadcast combo modules requiring stable component supply and long-term lifecycle support.

Supply support for TDA18271HD/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 electronics.

The TDA18271HD product line was developed to replace legacy can-based TV tuners with fully integrated silicon alternatives-targeting size reduction, power efficiency, and multistandard flexibility in terrestrial broadcast equipment.

FAQ

What TV and radio standards does the TDA18271HD/C2,557 support?

The TDA18271HD/C2,557 supports all major terrestrial analog and digital TV standards including PAL, SECAM, NTSC, DVB-T, ATSC, and ISDB-T, plus FM radio reception in the 76–108 MHz band. Its RF tracking filters and programmable IF bandwidths (1.5/6/7/8 MHz) enable seamless switching between standards without hardware changes. The TDA18271HD/C2,557 achieves this through on-die calibration and dual-synthesizer architecture, eliminating manual alignment.

How does the TDA18271HD/C2,557 implement dual-tuner synchronization?

The TDA18271HD/C2,557 uses dedicated MASTERSYNC and FREEZE pins to coordinate timing and gain between master and slave devices. In dual-tuner configurations, the master drives XTOUTP/XTOUTN to supply clock reference to the slave's XTALP/XTALN, while MASTERSYNC aligns AGC settling and FREEZE freezes LO tuning during handover. This ensures sub-100 ns skew and consistent signal level handling across channels-critical for picture-in-picture and record-while-watch functions using the TDA18271HD/C2,557.

Can the TDA18271HD/C2,557 operate without an external crystal?

No-the TDA18271HD/C2,557 requires a 16 MHz fundamental-mode crystal connected to XTALP/XTALN pins for primary clock generation. However, in slave mode, it accepts the 16 MHz buffered output (XTOUTP/XTOUTN) from a master TDA18271HD/C2,557 instead of a crystal. The crystal must meet 100 µW drive level and use a 5.6 pF shunt capacitor; validated parts include NDK NX5032 and Siward SX-5032. Omitting the crystal disables all synthesizer functions in the TDA18271HD/C2,557.

What are the power management options for the TDA18271HD/C2,557?

The TDA18271HD/C2,557 offers three standby modes controlled via SM/SM_LT/SM_XT bits in EP3 register: (1) Normal mode (all circuits active), (2) Standby with crystal oscillator and outputs enabled, and (3) Device-off mode (minimum power draw). All modes retain I²C-bus responsiveness. Power dissipation drops from 780 mW (normal) to <10 mW (device-off), enabling energy-efficient designs in always-on TV platforms using the TDA18271HD/C2,557.

Does the TDA18271HD/C2,557 require external IF filtering components?

No-the TDA18271HD/C2,557 integrates full IF selectivity including polyphase and low-pass filters for 1.5 MHz, 6 MHz, 7 MHz, and 8 MHz channel bandwidths, eliminating the need for external SAW filters. This integration reduces board area, component count, and manufacturing cost while ensuring consistent performance across temperature and voltage variations. The TDA18271HD/C2,557 achieves >65 dB image rejection and meets DVB-T sensitivity requirements without external IF components.