■ DESCRIPTION
The MB54609 is an intermediate-frequency (IF) quadrature modulator IC incorporating a 1.0-GHz up-converter optimized for use in digital mobile telecommunication systems such as GSM and PDC (Personal Digital Cellular).
The MB54609 incorporates a quadrature modulator for IF modulation, a transmission up-convert mixer, and a F/F type phase shifter as well, capable of handing IFs in a broad band.
In addition, the MB54609 operates at a low power supply voltage of 3.0 V and a low power supply current of 18 mA (both as typical values), contributing to saving the power consumption of the device.

■ FEATURES
• Incorporating a high-performance transmission mixer covering the entire frequency band of up to 800 MHz used for PDC services (Maximum output frequency of 1.1 GHz)
    Maximum output frequency: 1.1 GHz, Output level: –9 dBm (typical)
• Externally connecting the quadrature modulator with the transmission mixer, allowing a bandpass filter (BPF) to be inserted in between
    The quadrature modulator output can drive a 50 Ω load.
• Flip-flop phase shifter capable of handling intermediate frequencies in the broad band (100 to 800 MHz)
• Operation at low voltage: 2.7 to 3.0 to 3.3 V
• Low current consumption
    During operating: 18.0 mA (typical)
    In power save mode: 0.6 mA (typical)
• Operating temperature range: Ta = –20 to +85°C