TRF1222

www.ti.com TRF1222 TRF1222 SLWS171A – APRIL 2005 – REVISED DECEMBER 2005 3.5-GHz Integrated Up-Converter FEATURES Performs Up-Conversion in 3.5-GHz Radios (3300-3800 MHz) Integrated IF amplifier, Mixer and LO Buffer Amplifier Provision for external Image Reject / Band-Pass Filter TTL Switched Attenuator For Gain Control TTL Controlled Amplifier Power Down KEY SPECIFICATIONS RF Frequency Range: 3300-3800 MHz 18 dB of Gain with 16-dB Digital Attenuator Output P-1dB: +14 dBm, Typical Output IP3: +24 dBm, Typical LO Drive Level = 0 dBm, Typical DESCRIPTION The TRF1222 up-converts a UHF IF signal to an RF signal in the 3300 to 3800 MHz range for 3.5-GHz radio applications. The TRF1222 has 18 dB of gain and an output P-1dB of 14 dBm, typical. A TTL compatible, 1-bit 16-dB digital attenuator is provided for gain control and the IF and RF amplifiers can be shut off via a TTL control signal for power critical or TDD applications. In order to provide system requirements for LO/spurious rejection, the TRF1222 offers a signal path to an off-chip band-pass filter. Specifications are provided assuming an in-band 2-dB insertion loss filter. The TRF1222 is designed to complete the second up-conversion in Texas Instruments complete 3.5-GHz chip set. The linear nature of the up-converter makes it ideal for complex modulations schemes such as high order QAM or OFDM. BPF RFI MXRO RFO RF AMPLIFIER Mixer BALUN VGA IFIP IFIN Power Supply LO Buffer LOP LON −VNEG ...