HFA3766

HFA3766 PRELIMINARY January 1999 File Number 4328.1 400MHz AGC Quadrature IF Modulator/Demodulator The HFA3766 is a highly integrated baseband converter for quadrature modulation applications. It features all the necessary blocks for baseband modulation and demodulation of I and Q signals. It has a two stage integrated AGC IF amplifier with 82dB of voltage gain and 76dB of gain control range. Baseband antialiasing is integrated into the design. Four filter bandwidths are programmable via a two bit digital control interface. In addition, these filters are continuously tunable over a ±20% frequency range via one external resistor. For baseband modulation digital I and Q data are delivered to the transmit section. To achieve broadband operation, the Local Oscillator frequency input is required to be twice the desired frequency of modulation and demodulation. A selectable buffered divide by 2 LO output and a stable reference voltage are provided for convenience of the user. The device is housed in a thin 80 lead TQFP package well suited for PCMCIA board applications. ™ Features Integrates all IF Transmit and AGC Receive Functions Broad Frequency Range . . . . . . . . . . 10MHz to 400MHz I/Q Amplitude and Phase Balance . . . . 0.2dB, 2 Degrees 5th Order Programmable Low Pass Filter . . . . . . . . . . . . . . . . . . 2.2MHz to 17.6MHz 400MHz AGC Gain Strip . . . . . . . . . . . . . . . . . . . . . 82dB AGC Range . . . . . . . . . . . . . . . . ...