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TEA6840 датащи(PDF) 9 Page - NXP Semiconductors

номер детали TEA6840
подробное описание детали  New In Car Entertainment NICE car radio
Download  44 Pages
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA6840 датащи(HTML) 9 Page - NXP Semiconductors

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1999 Jul 12
9
Philips Semiconductors
Preliminary specification
New In Car Entertainment (NICE) car radio
TEA6840H
FUNCTIONAL DESCRIPTION
FM mixer 1
FM quadrature mixer converts FM RF (65 to 162.55 MHz)
to an IF of 10.7 MHz. The FM mixer provides inherent
image rejection and high RF sensitivity.
It is capable of tuning the US FM, US weather, Europe FM,
Japan FM and East Europe FM bands.
• US FM = 87.9 to 107.9 MHz
• US weather = 162.4 to 162.55 MHz
• Europe FM = 87.5 to 108 MHz
• Japan FM = 76.0 to 91 MHz
• East Europe FM = 65.8 to 74 MHz.
VCO
The L and C tuned VCO provides the Local Oscillator (LO)
signal for both FM and AM mixer 1. It has a frequency
range of 151.2 to 248.2 MHz.
Crystal oscillator
The crystal oscillator provides a 20.5 MHz signal that is
used for:
• Reference frequency for frequency synthesizer PLL
• LO for 2nd AM mixer
• Reference frequency for the IF counter
• Timing signal for the RDS update algorithm
• Reference frequency (75.4 kHz) for the TEA6880H.
PLL
Fast synthesizer PLL tuning system with local control for
inaudible RDS updating.
DAA
Digital Auto Alignment circuitry (FM RF DAA) for the
conversion of the VCO tuning voltage to a controlled
alignment voltage for the FM antenna tank circuit.
FM keyed AGC
FM contains keyed wide-band RF AGC. AGC detection
occurs at the FM mixer. The wide-band RF signal switches
a narrow band signal (IF) from the FM IF level detector
circuitry that controls the FM RF AGC block.
It includes an AGC pin diode drive circuit for the FM RF
AGC. The pin diode drive can be activated via the I2C-bus
as a local/distance function.
The AGC threshold is programmable and the keyed AGC
function is switchable via the I2C-bus.
FM IF amplifiers
The two FM IF amplifiers provide 10 dB and 4 dB
amplification with high linearity and dynamic range.
FM demodulator
The FM quadrature demodulator includes automatic
centre frequency adjustment and THD compensation.
AM tuner
The AM tuner is realized in a double conversion technique
and is capable of selecting LW/MW and SW bands.
AM mixer 1 converts AM RF to an IF1 of 10.7 MHz, while
AM mixer 2 converts 10.7 MHz IF1 to 450 kHz IF2.
• LW = 144 to 288 kHz
• MW = 530 to 1710 kHz (US AM band)
• SW = 5.85 to 9.99 MHz (including the 31 m, 41 m and
49 m bands).
AM RF and IF2 AGC
The AM RF includes a pin diode drive circuit.
The threshold detection points for AM AGC are performed
at AM mixer 1 and AM IF2. AGC thresholds are
programmable via the I2C-bus.
AM detector
The AM detector provides AM level information and AM AF
or AM IF2.
AM AF/IF2 SWITCH
The AM output provides either a detected AM Audio
Frequency (AF) or the corresponding AM IF2 signal.
The IF2 signal can be used for AM stereo decoder
processing.
AM noise blanker
The detection point for the AM noise blanker is the output
stage of AM mixer 1, while blanking is realized at the
output of the 2nd mixer.
Trigger sensitivity can be modified by changing the resistor
value at pin 46.


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