GENERAL DESCRIPTION
The AD8346 is a silicon RFIC I/Q modulator for use from 0.8 GHz to 2.5 GHz. Its excellent phase accuracy and amplitude balance allow high performance direct modulation to RF. The differential LO input is applied to a polyphase network phase splitter that provides accurate phase quadrature from 0.8 GHz to 2.5 GHz. Buffer amplifiers are inserted between two sections of the phase splitter to improve the signal-to-noise ratio. The I and Q outputs of the phase splitter drive the LO inputs of two Gilbert-cell mixers. Two differential V-to-I converters connected to the baseband inputs provide the baseband modulation signals for the mixers. The outputs of the two mixers are summed together at an amplifier which is designed to drive a 50 Ω load.

FEATURES
   High accuracy
      1 degree rms quadrature error @ 1.9 GHz
      0.2 dB I/Q amplitude balance @ 1.9 GHz
   Broad frequency range: 0.8 GHz to 2.5 GHz
   Sideband suppression: −46 dBc @ 0.8 GHz
   Sideband suppression: −36 dBc @ 1.9 GHz
   Modulation bandwidth: dc to 70 MHz
   0 dBm output compression level @ 0.8 GHz
   Noise floor: −147 dBm/Hz
   Single 2.7 V to 5.5 V supply
   Quiescent operating current: 45 mA
   Standby current: 1 μA
   16-lead TSSOP

APPLICATIONS
   Digital and spread spectrum communication systems
   Cellular/PCS/ISM transceivers
   Wireless LAN/wireless local loop
   QPSK/GMSK/QAM modulators
   Single-sideband (SSB) modulators
   Frequency synthesizers
   Image reject mixer