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PDF TEF6904A Data sheet ( Hoja de datos )
| Número de pieza | TEF6904A | |
| Descripción | a single chip car radio integrated circuit | |
| Fabricantes | NXP Semiconductors | |
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TEF6904A
Integrated car radio
Rev. 01 — 3 February 2006
Preliminary data sheet
1. General description
The TEF6904A is a single chip car radio integrated circuit with FM/AM tuner, stereo
decoder, weak signal processing and audio processing.
FM tuner with double conversion to IF1 = 10.7 MHz and IF2 = 450 kHz with integrated
image rejection for both IF1 and IF2; integrated channel filter with variable bandwidth
control; capable of US FM, Europe FM, Japan FM and Eastern Europe FM. AM tuner with
double conversion to IF1 = 10.7 MHz and IF2 = 450 kHz; capable of Long Wave (LW),
Medium Wave (MW) and full range Short Wave (SW) (11 m to 120 m bands).
Multiplex (MPX) stereo decoder, ignition noise blanker and extensive weak signal
processing.
Audio processing with flexible source selection, volume, balance, fader, input gain control
and inaudible tuning mute. The application of an external processor is possible. Integrated
audio filters for bass and treble and loudness control function.
The device can be controlled via the fast-mode I2C-bus (400 kHz) and includes
autonomous tuning functions for easy control without microcontroller timing. No manual
alignments are required.
2. Features
s FM Radio Frequency (RF) front-end with large dynamic range
s Integrated FM channel filter with controlled bandwidth
s Fully integrated FM demodulator
s Fully integrated stereo decoder with high immunity for birdy noise
s FM noise blanker with adaptive detection at MPX and level
s Signal quality detection: level, AM wideband, frequency deviation, ultrasonic
noise/adjacent channel
s FM weak signal processing: stereo blend, high cut control and soft mute
s AM RF Automatic Gain Control (AGC) control circuit for external cascode AGC and
PIN diode AGC
s Dual AM noise blanking system
s AM weak signal processing: high cut control and soft mute
s Low phase noise local oscillator
s In-lock detection for optimized adaptive Phase-Locked Loop (PLL) tuning speed
s Crystal oscillator reference with low harmonics
s Inaudible soft slope tuning mute for AM and FM
s Sequential state machine supporting each tuning action
s Flexible audio input source selection
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Philips Semiconductors
6. Pinning information
6.1 Pinning
TEF6904A
Integrated car radio
CPOUT 1
VTUNE 2
VCCPLL 3
PLLGND 4
i.c. 5
VTCM 6
VTC 7
IFMAGC 8
TRFAGC 9
n.c. 10
n.c. 11
n.c. 12
n.c. 13
DAAOUT 14
FMMIX1IN1 15
FMMIX1IN2 16
VCCRF 17
RFGND 18
IAMAGC 19
i.c. 20
TEF6904AH
60 LFOUT
59 RFOUT
58 LROUT
57 RROUT
56 INPL
55 INPR
54 PLOUT
53 PROUT
52 ADDR
51 SCL
50 SDA
49 DGND2
48 i.c.
47 i.c.
46 DGND1
45 LEVEL
44 VCC
43 GND
42 VREF
41 V60
008aaa015
Fig 2. Pin configuration for QFP80
6.2 Pin description
Table 3: Pin description
Symbol
Pin Description
CPOUT
1 charge pump output
VTUNE
2 tuning voltage; 3 mA charge pump output
VCCPLL
3 tuning PLL supply voltage
PLLGND
4 PLL ground
i.c. 5 internally connected; leave open
VTCM
6 IF filter reference voltage
VTC
7 IF filter center voltage
TEF6904A_1
Preliminary data sheet
Rev. 01 — 3 February 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
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Philips Semiconductors
TEF6904A
Integrated car radio
7.22 FM and AM AF noise blanker
The FM or AM tuner operation selects between two noise blanker operations optimized for
FM or AM ignition noise suppression.
In FM mode the noise blanker operates as a modified sample and hold circuit with
ultrasonic noise detection on MPX and detection of noise spikes on level.
In AM mode the audio signal is muted during the interference pulse triggered by slew-rate
detection of the audio signal.
7.23 Fixed high cut and high cut control
The high cut part is a low-pass filter circuit with seven bandwidth settings. The cut-off
frequencies of the filter curves can be selected to match different application requirements
(fixed high cut).
The high cut circuit also provides a dynamic control of the filter response, the High Cut
Control (HCC). This function is controlled by the HCC signal from the weak signal
processing.
7.24 De-emphasis
The signal passes the low-pass filter de-emphasis block and is then fed to the source
selector. The de-emphasis time constant can be selected between the standards of 50 µs
and 75 µs.
7.25 Weak signal processing
The weak signal processing block detects quality degradations in the incoming signal and
controls the processing of the audio signal accordingly. The weak signal processing block
has three different quality criteria: The average value of the level voltage, AM components
on the level voltage (WAM = wideband AM) and high frequency components in the MPX
signal (USN = ultrasonic noise).
In the weak signal processing block these signals are combined in specific ways and used
for the generation of control signals for soft mute, stereo blend (stereo noise control, SNC)
and HCC. Detector time constants of soft mute, HCC and SNC can be selected
independently.
In AM mode soft mute and HCC are controlled by the average value of the level voltage.
7.26 Audio step interpolation
The tone/volume blocks of source selector, volume/balance, bass/loudness, fader and
output mute include the Audio Step Interpolation (ASI) function. This minimizes audible
pops by smoothing the transitions in the audio signal during the switching of the controls.
7.27 Source selector
The source selector selects one out of several input sources:
TEF6904A_1
Preliminary data sheet
• One internal stereo signal (AM/FM tuner)
• Eight input pins allow many combinations of external sources by means of flexible
input selection
Rev. 01 — 3 February 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
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