參數(shù)資料
型號(hào)： TEF6700HL
廠商： NXP SEMICONDUCTORS
元件分類： 調(diào)諧器
英文描述： Car radio tuner front-end for digital IF
中文描述： AUDIO TUNER, PQFP64
封裝： 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, SOT-314-2, MS-026, LQFP-64
文件頁(yè)數(shù)： 10/56頁(yè)
文件大小： 305K
代理商： TEF6700HL
2003 Oct 21
10
Philips Semiconductors
Product specification
Car radio tuner front-end for digital IF
TEF6700HL
7
FUNCTIONAL DESCRIPTION
7.1
FM I/Q-mixer
The FM quadrature mixer converts FM RF
(64 to 162.55 MHz) to an IF of 10.7 MHz. The FM mixer
provides inherent image rejection and high RF sensitivity.
The image rejection can be switched from ‘low’ injection
Local Oscillator (LO) to ‘high’ injection LO via the I
2
C-bus.
The mixer gain can be increased by 6 dB via the I
2
C-bus.
In this case the threshold of the FM keyed AGC has to be
lowered by 6 dB to prevent the mixer from being
overloaded.
The mixer is capable of tuning the:
US FM and US IBOC DAB from 87.9 to 107.9 MHz
US weather FM from 162.4 to 162.55 MHz
Europe FM from 87.5 to 108 MHz
Japan FM from 76 to 91 MHz
East Europe FM from 64 to 74 MHz.
7.2
Buffer output for weather band flag
The buffer output (pin WBFLAG) is HIGH for weather band
mode.
7.3
VCO
The varactor tuned LC oscillator provides the local
oscillator signal for both FM and AM mixer 1. It has a
frequency range from 159.9 to 248.2 MHz.
7.4
Crystal 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
Reference frequency for the IF counter
Timing signal for the RDS update algorithm.
7.5
PLL
The fast synthesizer PLL tuning system with local control
is used for inaudible RDS updating.
7.6
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.
7.7
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 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.
7.8
FM IF amplifier
The FM IF amplifier provides 10.5 or 14 dB gain,
selectable via the I
2
C-bus with high linearity over a wide
dynamicrange.InIBOC DABmode(activatedviaI
2
C-bus)
FM IF is buffered and directly fed to FM IF AGC bypassing
the second FM ceramic filter.
7.9
FM IFAGC
This is a linear FM IF AGC amplifier with multiplexed
inputs for FM standard and FM IBOC DAB. The gain
controlled FM IF is output by the multiplexed
FM IF/AM IF2 buffer for a car IF DSP IC (e.g. SAA7724H).
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TEF6721HL/V1,557 功能描述:調(diào)諧器 DIGITAL IF TUNER IC 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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