TEF6890H/V2,557

Overview

The TEF6890H is a monolithic BiMOS integrated circuit designed as an AM/FM car radio signal processor. It integrates stereo decoding, weak signal processing, and ignition noise blanking for both AM and FM bands. The device includes an RDS/RBDS demodulator that utilizes the tuner IC reference frequency, eliminating the need for an external crystal. Audio processing features comprise an input selector for four sources, tone/volume control with programmable loudness, treble, and bass adjustments, and fader/mute capabilities. Communication is managed via a Fast mode 400 kHz I2C-bus interface.

Applications

• Car radio integrated signal processor
• AM/FM audio post-processing systems
• Vehicle infotainment architectures requiring RDS functionality

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package variant and availability status. The component operates within an 8 V to 9 V supply range and requires coupling capacitors for signal inputs and outputs. Ensure compatibility with the host microcontroller's I2C logic levels, which range from 2.5 V to 5 V.

Selection Notes

Select this component for applications requiring high integration in automotive radio designs. It supports mixed bus speeds by allowing a gated I2C-bus loop through to the tuner IC. The device offers programmable sensitivity for weak signal detectors and adjustable soft mute slopes. Verify that the system design accommodates the QFP44 package dimensions and thermal requirements for the specified operating temperature range.

Part Context

The TEF6890H belongs to the NICE family of car radio integrated circuits, originally developed by Philips Semiconductors. It is functionally similar to the TEF6894H but may differ in specific pin configurations or feature sets. Both devices serve as signal processors for AM/FM tuners, handling audio decoding and RDS demodulation within the same product lineage.

Replacement Considerations

The TEF6894H is a related model within the same product family. Cross-reference the datasheet for pin compatibility and functional differences before substitution. No other direct public substitutes are confirmed in the provided documentation.

FAQ

Does the TEF6890H require an external crystal for RDS demodulation?

No, the RDS demodulator uses the reference frequency (75.4 kHz) provided by the tuner IC, so no external crystal is necessary.

What is the maximum volume control range of the TEF6890H?

The volume control ranges from +20 dB to -59 dB in 1 dB steps. Combined with the loudness control, the overall range extends to -79 dB.

How does the device handle noise blanking for AM and FM signals?

It features fully integrated noise blankers for both bands. In FM mode, it operates as a sample and hold circuit, while in AM mode, it mutes the audio signal during interference pulses detected by a slew rate detector.