Front-end and PLL synthesizers for
• Synthesizer function which includes a Voltage
Controlled Oscillator (VCO), dividers, phase detector,
charge-pump and in-lock detector
• FM mixer with AGC
• AM RF amplifier with AGC
• AM mixer.
• Car radios.
The TEA6810V and TEA6811V, together with TEA6821V
forms an AM/FM receiving concept for electronically tuned
The TEA681xV is an FM/AM front-end with one local
synthesized oscillator for both AM and FM which is used
together with the TEA6821T in a double-conversion
concept. It delivers a first FM-IF of 72.2 MHz and, for
MW/LW, a first AM-IF of 10.7 MHz.
Minimum alignments are required due to wideband RF
inputs and the common AM/FM VCO.
High dynamic behaviour and minimum distortion is
obtained by a special RF input design combined with AGC.
High sensitivity is possible in combination with RF input
Minimum interference is experienced due a to special
synthesizer loop design and ensuring that the I2C-bus is
inoperative in the locked-tuned condition.
The reference frequency for the synthesizer and the
I2C-bus information is delivered by the TEA6821V.
The programmable local/dx switch enables switching the
gain of the FM mixer from normal AGC control (FM dx) to
the forced 4th level of AGC (FM local).
QUICK REFERENCE DATA
analog supply voltage (pin 2)
analog supply voltage (pin 13)
AM AGC range
FM AGC range
AM input frequency
FM input frequency
operating ambient temperature
plastic very small outline package; 40 leads
plastic very small outline package; 40 leads; face down
1996 Jun 18