TEF6894H datasheet(3/55 Pages) PHILIPS

3 / 55 page

2003 Oct 21

Philips Semiconductors

Product speciﬁcation

Car radio integrated signal processor

TEF6894H

FEATURES

1.1

General

• High integration

• No external components except coupling capacitors for

signal inputs and outputs

• QFP44 package with small Printed-Circuit Board (PCB)

footprint.

1.2

I2C-bus

• Fast mode 400 kHz I2C-bus, interfaces to logic levels

ranging from 2.5 to 5 V

• Gated I2C-bus loop through to tuner IC

– Eases PCB layout (crosstalk)

– Allows mix of 400 kHz and 100 kHz busses

– Low bus load reduces crosstalk

– Buffered I/O circuit

– Supply voltage shift between both buses allowed.

• Shortgate function offers easy control with automatic

gating of a single transmission; suited for TEA684x

• Autogate function offers transparent microcontroller

control with automatic on/off gating (programmable

address).

1.3

Stereo decoder

• FM stereo decoder with high immunity to birdy noise and

excellent pilot cancellation

• Integrated IF roll-off correction controlled via I2C-bus

• De-emphasis selectable between 75 and 50 µs via

I2C-bus.

1.4

Noise blanking

• New fully integrated AM noise blanker with excellent

performance

• Fully integrated FM noise blanker with superior

performance.

1.5

Weak signal processing

• FM weak signal processing with detectors for RF level,

Ultrasonic Noise (USN) and Wideband AM (WAM)

information

• AM weak signal processing with detectors for level

information

• AM processing with soft mute and High Cut Control

(HCC)

• FM processing with soft mute, stereo blend and HCC

• Setting of the sensitivity of the detectors and start and

slope of the control functions via I2C-bus

• Weather band de-emphasis

• Level, USN and WAM read-out via I2C-bus (signal

quality detectors)

• Full support of tuner AF update functions with TEA684x

tuner ICs, FM audio processing holds the detectors for

the FM weak signal processing in their present state

during RDS updating.

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