1 Features
1• IQ Modulator with Integrated PLL and VCO
• Integer-N/Fractional-N PLL
• Modulator Supports 400 MHz to 4200 MHz
• PLL and VCO Supports 280 MHz to 4100 MHz
• OIP3 at 900 MHz = 31 dBm
• OIP3 at 1800 MHz = 30 dBm
• VCO 1800-MHz Open Loop Phase Noise =
–141 dBc/Hz at 1 MHz Offset
• Independent LO Output Supports divide-by 1/2/4/8
• Modulator Low Power and High Gain Modes
• Multiple Power Down Modes

2 Applications
• Wireless Infrastructure
– CDMA: IS95, UMTS, CDMA2000, TD-SCDMA
– LTE, TD-LTE, LTE Advanced
– TDMA: GSM, EDGE, MC-GSM
• Point-to-Point Microwave, Point-to-Multipoint
Microwave
• Software Defined Radios
• RF Repeaters, Distributed Antenna Systems

3 Description
The TRF3722 is a high performance direct
conversion quadrature modulator with exceptional
linearity and low noise performance. The typical
0.25-V baseband common mode voltage supports
seamless interface with current source DACs. The
device integrates the PLL and VCO to provide the
local oscillator (LO) to the modulator. The PLL and
VCO provides excellent phase noise performance to
satisfy the most stringent transmit communication
requirements. The device also provides additional LO
output for driving a second modulator or down
converting mixer. The modulator features a high gain
mode for a typical 3-dB gain increase and a low
power mode when power optimization is desired.