參數(shù)資料
型號(hào)： TEA6849H
廠商： NXP SEMICONDUCTORS
元件分類： 接收器
英文描述： New In Car Entertainment car radio tuner IC with Precision Adjacent Channel Suppression
中文描述： AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP80
封裝： 12 X 12 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-315-1, LQFP-80
文件頁數(shù)： 9/65頁
文件大?。?/td> 405K
代理商： TEA6849H
2003 Dec 19
9
Philips Semiconductors
Product specification
New In Car Entertainment car radio tuner IC with
Precision Adjacent Channel Suppression (NICE-PACS)
TEA6849H
7
FUNCTIONAL DESCRIPTION
7.1
Oscillators
7.1.1
VCO
ThevaractortunedVCOprovidesthelocaloscillatorsignal
for both FM and AM mixer 1. It has a frequency range of
162.9 to 248.2 MHz.
7.1.2
PLL
Fast synthesizer PLL tuning system with local control for
inaudible RDS updating.
7.1.3
C
RYSTAL OSCILLATOR
The crystal oscillator provides a 20.5 MHz signal that is
used for:
Reference frequency for frequency synthesizer PLL
Local oscillator for AM mixer 2 and FM mixer 2
Reference frequency for the IF counter
Timing signal for the RDS update algorithm
Referencefrequency(75.368 kHz)fortheTEA688x(car
audio signal processor - CASP) or TEF689x (car radio
integrated signal processor - CRISP).
7.2
DAA
To reduce the number of manual alignments in production
the following I
2
C-bus controlled Digital Auto Alignment
(DAA) functions are included:
FM RF DAA
– 7-bit DAA circuitry for the conversion of the VCO
tuning voltage to a controlled alignment voltage for
the FM antenna tank circuit
FM and AM level DAA
– Level DAA circuitry for alignment of slope (3-bit) and
starting point (5-bit) of the level curve
IF2 centre DAA
– Centre frequency alignment (7-bit) of integrated
FM IF2 dynamic selectivity.
7.3
FM signal channel
7.3.1
FM
MIXER
1
FM quadraturemixerconvertsFM RF(65 to 108 MHzand
weather band) to 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 FM = 162.4 to 162.55 MHz
Europe FM = 87.5 to 108 MHz
Japan FM = 76 to 91 MHz
East Europe FM = 65 to 74 MHz.
7.3.2
B
UFFER OUTPUT FOR WEATHER BAND FLAG
(
PIN
WBFLAG)
The buffer output on pin WBFLAG is HIGH for weather
band mode.
7.3.3
FM
KEYED
AGC
The AGC threshold is programmable and the keyed AGC
function is switchable via the I
2
C-bus. AGC detection
occurs at the input of the first FM mixer. If the keyed AGC
function is activated, the AGC is keyed only by the narrow
band level. The AGC PIN diode drive can be activated via
the I
2
C-bus as a local function for search tuning. The AGC
sources a constant 10 mA current into the FM PIN diode in
AM mode.
7.3.4
FM IF
AMPLIFIER
The FM IF amplifier provides 18 dB amplification with high
linearity over a wide dynamic range.
7.3.5
FM
MIXER
2
The FM mixer 2 converts 10.7 MHz FM IF1 to 450 kHz
FM IF2 in I and Q phase to achieve image rejection in the
demodulator.
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TEA6849H/V1-T 功能描述:調(diào)諧器 NICE/PACS SONY RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
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