TEF6903AH/V2,518 NXP Semiconductors, TEF6903AH/V2,518 Datasheet - Page 8

• Manufacturer Part Number: TEF6903AH/V2,518
• Description: IC INTEGRATED CAR RADIO 80-QFP
• Manufacturer: NXP Semiconductors

Specifications of TEF6903AH/V2,518

• 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: 80-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: 935281201518; TEF6903AH/V2-T; TEF6903AH/V2-T

NXP Semiconductors
TEF6903A_3
Product data sheet
7.2 FM RF AGC
7.3 FM mixer 2
7.4 FM IF2 channel filter
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
AGC detection at the FM front-end mixer input with programmable threshold. When the
threshold is exceeded, the PIN diode drive circuit sources a current to an external PIN
diode circuit, keeping the RF signal level constant. Keyed AGC function is selectable via
the I
diode drive circuit can optionally deliver a fixed current; this local mode can be used for
search tuning on absolute RF levels. In AM mode, the FM AGC PIN diode drive circuit can
be set to source a fixed current into the external FM PIN diode circuitry.
The FM quadrature mixer 2 converts 10.7 MHz IF1 to 450 kHz IF2 and includes image
rejection with the integrated channel filter. Two gain settings can be selected to
compensate for high ceramic filter insertion loss.
The order and dynamic range of the FM IF2 channel filter is designed for operation with
only one external ceramic filter. The filter characteristic is optimized to combine high
selectivity with low distortion. The bandwidth of the filter can be set to a range of fixed
settings or automatically via the bandwidth control algorithm. When the automatic mode is
selected the bandwidth depends on the signal conditions.
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
2
C-bus and uses the in-band level information derived from the limiter. The AGC PIN
Rev. 03 — 3 April 2008
2
C-bus control.
TEF6903A
Integrated car radio
2
C-bus or
© NXP B.V. 2008. All rights reserved.
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