GENERAL DESCRIPTION
The TEA5591A is a 24-pin integrated radio circuit, derived from the TEA5591 and is designed for use in AM/FM portable radios and clock radios. The TEA5591A differs from the TEA5591 in that it has:
    • Separate IF input pins for AM and FM
    • A split-up AM-IF stage (for distributed selectivity)
    • An LED driver indicator

The main advantage of the TEA5591A is its ability to operate over a wide range of supply voltages (1.8 to 15 V) without any loss of performance.
The AM circuit incorporates:
    • A double balance mixer
    • A ‘one-pin’ oscillator with amplitude control operating in the 0.6 to 30 MHz frequency range
    • A split-up IF amplifier
    • A detector
    • An AGC circuit which controls the IF amplifier and mixer.

The FM circuit incorporates:
    • An RF input amplifier
    • A double balanced mixer
    • A ‘one-pin’ oscillator
    • Two IF amplifiers (for distributed selectivity)
    • A quadrature demodulator for a ceramic filter
    • Internal AFC

FEATUREs
• LED AM/FM indicator
• A DC AM/FM switch facility
• Three separate stabilizers to enable operation over a wide range of supply voltages (1.8 to 15 V)
• All pins (except pin 10) are ESD protected