TEF6902AH/V5S,518 NXP Semiconductors, TEF6902AH/V5S,518 Datasheet - Page 8
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TEF6902AH/V5S,518
Manufacturer Part Number
TEF6902AH/V5S,518
Description
IC CAR RADIO SGL CHIP CIRC 64QFP
Manufacturer
NXP Semiconductors
Datasheet
1.TEF6902AHV5S518.pdf
(106 pages)
Specifications of TEF6902AH/V5S,518
Modulation Or Protocol
AM, FM, WB
Applications
AM/FM Radio Receiver
Current - Receiving
102mA
Data Interface
PCB, Surface Mount
Antenna Connector
PCB, Surface Mount
Voltage - Supply
8 V ~ 9 V
Operating Temperature
-40°C ~ 85°C
Package / Case
64-QFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Frequency
-
Sensitivity
-
Memory Size
-
Data Rate - Maximum
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
935288824518
NXP Semiconductors
TEF6902A_3
Product data sheet
7.10 Crystal oscillator
7.11 Tuning PLL
7.5 FM limiter and level detection
7.6 FM demodulator
7.7 Center frequency and bandwidth tuning and center frequency DAA
7.8 Bandwidth control algorithm
7.9 VCO and dividers
The limiter amplifies the IF filter output signal, removes AM modulations from the IF signal
and supplies a well defined signal for the FM demodulator. From the limiter also the Radio
Signal Strength Information (RSSI) is derived which is converted to a suitable level voltage
with minimum temperature drift.
The fully integrated FM demodulator converts the IF signal from the limiter to the
FM multiplex output signal with low distortion.
The center frequency as well as the bandwidth of both the IF filter and demodulator are
coupled to the crystal reference frequency. A coarse alignment (IFCAP) sets the circuit
operating range and the center frequency fine adjustment is achieved with a 6-bit
alignment (IFCF).
The bandwidth of the IF filter can be selected with 5 bits, directly via I
automatically via the bandwidth control algorithm. The bandwidth control algorithm
detects the amount of adjacent channel interference, the deviation of the desired signal,
detuning, multipath and signal strength to define the optimum bandwidth setting of the
IF filter. Flexibility on the algorithm settings is provided via the I
The varactor tuned LC oscillator together with the dividers provides the local oscillator
signal for both AM and FM front-end mixers. The VCO has an operating frequency of
approximately 160 MHz to 250 MHz. In FM mode the VCO frequency is divided by 2 or 3.
These dividers generate in-phase and quadrature-phase output signals used in the
FM front-end mixer for image rejection. In AM mode the VCO frequency is divided by 6, 8,
10, 16 or 20 depending on the selected AM band. The amplitude of the VCO is controlled
by a digital AGC to ensure a safe oscillation start-up at a wide range of the loaded Q.
The crystal oscillator provides a 20.5 MHz signal. A divider-by-two generates in-phase
and quadrature-phase mixer frequencies for the conversion from IF1 to IF2 including
image rejection. The reference divider generates from the crystal frequency various
reference frequencies for the tuning PLL. Also timing signals for the sequential machine
as well as references for the integrated FM channel filter, the stereo decoder and the
integrated audio filters are derived from the crystal reference.
The tuning PLL locks the VCO frequency divided by the programmable divider ratio to the
reference frequency. Due to the combination of different charge pump signals in the
PLL loop filter, the loop parameters are adapted dynamically. Tuning to different
RF frequencies is done by changing the programmable divider ratio. The tuning step size
is selected with the reference frequency divider setting.
Rev. 03 — 19 March 2008
2
C-bus control.
TEF6902A
Integrated car radio
2
C-bus or
© NXP B.V. 2008. All rights reserved.
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