NXP Semiconductors TEA5757H/V1,557

Overview

TEA5757H/V1,557 from NXP (formerly Philips Semiconductors) is a 44-pin AM/FM stereo radio IC with integrated self-tuned PLL synthesizer and digital bus interface. It delivers FM reception from 50–150 MHz and AM from 0.144–30 MHz, supports programmable search sensitivity (down to 0.4 µV FM limiting sensitivity), operates from 2.5–12 V supply, and enables preset, auto-search, and auto-store functions in automotive and portable audio systems.

For engineers reviewing the TEA5757H/V1,557 datasheet, TEA5757H/V1,557 pinout, TEA5757H/V1,557 application, or TEA5757H/V1,557 equivalent, this page provides verified functional specifications, validated pin roles, confirmed tuning architecture, real-world application context for car radios and portable receivers, and two technically documented alternative parts with explicit differences.

Technical Context

The TEA5757H/V1,557 implements a fuzzy-logic-based Self Tuned Radio (STR) architecture that mimics manual tuning via coarse/fine frequency convergence without external IF counters or loop filters. Its on-chip PLL synthesizer uses a 25-bit shift register controlled via a 3-wire serial bus (BUS-CLOCK, DATA, WRITE-ENABLE) and integrates AM/FM front-ends, AFC, stereo decoder with signal-dependent blend, soft/hard mute, and dual programmable I/O ports (P0/P1).

It features distributed IF gain, ceramic filter compatibility (e.g., SFE10.7MS3A20K-A), high-impedance MOSFET AM input, and independent tuning operation unaffected by channel spacing. The internal stabilized supplies VSTAB(A) and VSTAB(B) at 1.4 V support analog circuitry stability across temperature (−15 °C to +60 °C).

Key Specifications

Pinout & Package

TEA5757H/V1,557 is housed in a plastic QFP44 package (SOT307-2), 10 × 10 × 1.75 mm body, 1.3 mm lead length.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar AM/FM radio receiver applications.

Compared with TEA5757H/V1,557, TEA5759H serves a distinct regional standard and cannot substitute without hardware changes, while Si4732-A10 offers modern SDR flexibility at the cost of added software complexity and higher BOM cost.

Availability

TEA5757H/V1,557 is available at Aetrix Electronics and suitable for automotive infotainment systems, portable audio receivers, home stereo tuners, and industrial broadcast monitoring equipment requiring stable component supply and long-lifecycle support.

Supply support for TEA5757H/V1,557 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 (originally Philips Semiconductors) is a global leader in high-performance analog and mixed-signal ICs for automotive, industrial, and consumer applications.

The TEA5757H/V1,557 belongs to NXP's legacy Self Tuned Radio (STR) product line, designed specifically for cost-optimized, high-reliability AM/FM radio systems where minimal external components and deterministic analog tuning behavior are critical.

FAQ

What is the function of the TUNE pin on the TEA5757H/V1,557?

The TUNE pin (8) is a current-source output that drives an external varactor diode (e.g., BB804) to control the VCO frequency. It delivers a proportional tuning current-not voltage-enabling precise frequency synthesis without external DACs or op-amps. This architecture is integral to the TEA5757H/V1,557's self-tuned operation and eliminates loop-filter components required in conventional PLL designs.

Does the TEA5757H/V1,557 support RDS or RBDS functionality?

No, the TEA5757H/V1,557 does not include RDS (Radio Data System) or RBDS decoding capability. It is a baseband AM/FM stereo receiver with MPX output (MPXI pin) and pilot tone detection, but lacks the digital demodulator, error correction, and data buffer required for RDS processing. For RDS support, designers must pair TEA5757H/V1,557 with an external microcontroller or select a modern alternative like the Si4732-A10.

What are the key differences between TEA5757H/V1,557 and TEA5759H?

The TEA5757H/V1,557 uses high-side LO injection (FM oscillator above RF), supporting 87.5–108 MHz EU/US FM bands. The TEA5759H uses low-side LO injection (oscillator below RF), optimized for 76–90 MHz Japanese FM. Their tuning equations differ (FM VALUE = FMRF + FMIF vs. FMRF − FMIF), requiring distinct crystal, tank, and filter designs. They are not pin-compatible or functionally interchangeable.

Can the TEA5757H/V1,557 operate from a single 3.3 V supply?

Yes, the TEA5757H/V1,557 supports VCC1 = 3.3 V (within 2.5–12 V range) for analog core operation, and VDDD = 3.3 V for digital logic. However, VCC2 (tuning supply) must be ≥5 V to ensure sufficient tuning voltage swing (0.7 V to VCC2 − 0.75 V) for full-band coverage. A dual-rail supply (3.3 V + 5–12 V) is recommended for optimal performance across all bands.

How does the fuzzy-logic tuning algorithm improve station acquisition in the TEA5757H/V1,557?

The TEA5757H/V1,557's fuzzy-logic algorithm emulates manual tuning by dynamically adjusting step size and convergence criteria based on field strength (FSI) and AFC S-curve slope. It avoids false locks on adjacent-channel interference or noise peaks, achieving reliable in-lock detection without external IF counters or ceramic filter calibration-reducing acquisition time to ≤100 ms for preset tuning and ≤10 s for full-band search.