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TEF6721HL Datasheet

  • TEF6721HL

  • Car radio tuner front-end for digital IF

  • 45頁

  • PHILIPS

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TEF6721HL
Car radio tuner front-end for digital IF
Rev. 03 鈥?19 July 2005
Product data sheet
1. General description
The TEF6721HL 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 combined
AM and FM gain controlled differential Intermediate Frequency (IF) output for the
SAF7730H including the following functions:
鈥?/div>
AM up-conversion tuner to an IF frequency of 10.7 MHz for Long Wave (LW)/Medium
Wave (MW)/Short Wave (SW) (31 m, 41 m and 49 m bands)
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 Voltage-Controlled Oscillator (VCO), crystal oscillator and
Phase-Locked Loop (PLL) synthesizer on one chip.
2. Features
s
FM mixer for conversion of FM Radio Frequency (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
Automatic Gain Control (AGC) PIN diode drive circuit for FM RF AGC; AGC detection
at FM mixer input and IF AGC ampli鏗乪r input; AGC threshold for detection at FM mixer
input is a programmable and keyed function switchable via the I
2
C-bus; the AGC PIN
diode drive can be activated via the I
2
C-bus as a local function for search tuning; in
AM mode the AGC PIN diode drive can be activated via the I
2
C-bus if required
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
Combined AM and FM IF AGC ampli鏗乪r with high dynamic input range; one of the four
gain settings is selected automatically via two control signals from IF Digital Signal
Processor (DSP); combined differential AM and FM IF output signal to
analog-to-digital converter of IF DSP
s
AM mixer for conversion of AM RF to AM IF 10.7 MHz
s
AM RF PIN diode drive circuit and RF Junction Field Effect Transistor (JFET)
conductance control by AGC cascode drive circuit; AGC threshold detection at AM
mixer and IF AGC input; threshold for detection at AM mixer is programmable via the
I
2
C-bus
s
AM and FM RF AGC monitor output intended for gain control of active antennas

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