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TEF6701HL Datasheet

  • TEF6701HL

  • Car radio tuner front-end for digital IF

  • 55頁

  • PHILIPS

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TEF6701HL
Car radio tuner front-end for digital IF
Rev. 01 鈥?16 November 2004
Product data sheet
1. General description
The TEF6701HL is a single chip car radio tuner for AM, FM standard, FM In-Band
On-Channel Digital Audio Broadcast (IBOC DAB) and weather band providing gain
controlled output of FM IF and AM IF2 for a car IF DSP IC (e.g. SAA7724H) including the
following functions:
鈥?/div>
AM double conversion tuner for LW/MW/SW (31 m, 41 m and 49 m bands) with
IF1 = 10.7 MHz and IF2 = 450 kHz
鈥?/div>
FM single conversion tuner to an IF frequency of 10.7 MHz with integrated image
rejection for US FM, Europe FM, Japan FM, East Europe FM and weather band
reception; all bands can be selected using high side or low side Local Oscillator (LO)
injection
鈥?/div>
Tuning system includes VCO, crystal oscillator and PLL synthesizer on one chip.
2. Features
s
FM mixer for conversion of FM RF (64 MHz to 108 MHz and US weather band) to an
IF of 10.7 MHz; the mixer provides inherent image rejection and can be switched from
low injection to high injection Local Oscillator (LO) via the I
2
C-bus; two different mixer
conversion gains can be selected via the I
2
C-bus
s
AGC PIN diode drive circuit for FM RF AGC; AGC detection at FM mixer input; the
AGC PIN diode drive can be activated via the I
2
C-bus as a local function for search
tuning; AGC threshold is a programmable and keyed function switchable via the
I
2
C-bus
s
Digital alignment circuit for bus controlled matching of oscillator tuning voltage to FM
antenna tank circuit tuning voltage
s
Buffer output for weather band 鏗俛g
s
FM IF linear ampli鏗乪r with high dynamic input range; ampli鏗乪r gain can be switched to
two different positions via the I
2
C-bus
s
FM IF AGC with multiplexed inputs for FM and In-Band On-Channel Digital Audio
Broadcast (IBOC DAB)
s
Buffer ampli鏗乪r for FM IBOC DAB IF bypassing second IF 鏗乴ter can be activated via
I
2
C-bus
s
AM mixer 1 for conversion of AM RF to AM IF1 10.7 MHz
s
AM RF PIN diode drive circuit and RF JFET conductance control by AGC cascode
drive circuit; AGC threshold detection at AM mixer 1 and IF2 AGC input; threshold is
programmable via the I
2
C-bus
s
AM noise blanker with blanking at AM IF2; AM noise blanker can be deactivated via
the I
2
C-bus
s
AM mixer 2 for conversion of AM IF1 to AM IF2 450 kHz

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