TEF6903AH/V5S,518 NXP Semiconductors, TEF6903AH/V5S,518 Datasheet - Page 10

• Manufacturer Part Number: TEF6903AH/V5S,518
• Description: IC CAR RADIO SGL CHIP CIRC 80QFP
• Manufacturer: NXP Semiconductors

Specifications of TEF6903AH/V5S,518

• Modulation Or Protocol: AM, FM, WB
• Applications: AM/FM Radio Receiver
• Current - Receiving: 102mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 8 V ~ 9 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Frequency: -
• Sensitivity: -
• Memory Size: -
• Data Rate - Maximum: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 935288823518

NXP Semiconductors
TEF6904A_3
Product data sheet
7.15 AM IF noise blanker
7.16 AM IF AGC amplifier and demodulator
7.17 AM level detection
7.18 AM and FM level DAA
7.19 AM and FM IF counter
7.20 Tuning mute
7.21 FM stereo decoder
The spike detection for the AM IF noise blanker is at the output of the AM front-end mixer.
Blanking is realized at the second AM mixer.
The 450 kHz IF2 signal after the ceramic channel selection filter is amplified by the
IF AGC amplifier and demodulated.
The IF2 signal used for AM IF AGC and demodulation is also used in the limiter circuit for
in-band level detection.
The start and slope of the level detector output are programmable to achieve level
information independent of gain spread in the signal channel.
The output signal from the limiter is used for IF counting in both AM and FM.
A soft slope tuning mute is controlled by the sequential machine for different tuning
actions to eliminate audible effects of tuning and band switching.
A low-pass filter provides additional suppression of high frequency interferences at the
stereo decoder input and the necessary signal delay for FM noise blanking.
The MPX signal is decoded in the stereo decoder part. An integrated oscillator and pilot
PLL is used for the regeneration of the 38 kHz subcarrier. The required 19 kHz
and 38 kHz signals are generated by division of the oscillator output signal in logic
circuitry.
By means of a 19 kHz quadrature detector the pilot PLL oscillator frequency is locked to
the incoming 19 kHz stereo pilot. A pilot level voltage derived from a 19 kHz in-phase
detector is used for stereo detection and for generation of an anti-phase 19 kHz signal to
remove the pilot tone from the audio signal.
The signal is then decoded in the decoder part. The L-R side signal is demodulated using
the 38 kHz subcarrier and combined with the main signal to the left and right audio
channel. A fine adjustment is done by adjusting the gain of the L-R signal. A smooth mono
to stereo takeover is achieved by controlling the efficiency of the matrix by the Stereo
Noise Control (SNC) signal from the weak signal processing block.
Rev. 03 — 20 March 2008
TEF6904A
Integrated car radio
© NXP B.V. 2008. All rights reserved.
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