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TEF6890H Scheda tecnica(PDF) 3 Page - NXP Semiconductors |
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TEF6890H Scheda tecnica(HTML) 3 Page - NXP Semiconductors |
3 / 55 page 2003 Oct 21 3 Philips Semiconductors Product specification Car radio integrated signal processor TEF6890H 1 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. 1.6 RDS demodulator • RDS/RBDS demodulator uses TEA684x reference frequency, no external crystal necessary. |
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