1 Features

• High Linearity:
  • Output IP3: 30 dBm at 1850 MHz
• Low Output Noise Floor: –160 dBm/Hz
• 78-dBc Single-Carrier WCDMA ACPR
  at –10-dBm Channel Power
• Unadjusted Carrier Suppression: –40 dBm
• Unadjusted Sideband Suppression: –45 dBc
• Single Supply: 3.3-V Operation
• 1-bit Gain Step Control
• Fast Power-Up/Power-Down

2 Applications

• Cellular Base Station Transmitter
• CDMA: IS95, UMTS, CDMA2000, TD-SCDMA
• LTE (Long Term Evolution)
• TDMA: GSM, EDGE/UWC-136
• Multicarrier GSM (MC-GSM)
• Wireless MAN Wideband Transceivers

3 Description

The TRF3705 is a low-noise direct quadrature modulator, capable of converting complex modulated signals from baseband or IF directly up to RF. The TRF3705 is a high-performance, superior-linearity device that is ideal to up-convert to RF frequencies of 300 MHz (Note: appropriate matching network is required for optimal performance at 300 MHz) through 4 GHz. The modulator is implemented as a double-balanced mixer.

The RF output block consists of a differential-to-single-ended converter that is capable of driving a single-ended 50-Ω load. The TRF3705 requires a 0.25-V common-mode voltage for optimum linearity performance. The TRF3705 also provides a fast power-down pin that can be used to reduce power dissipation in TDD applications.

The TRF3705 is available in an RGE-24 VQFN package.

1. For all available packages, see the orderable addendum at the end of the data sheet.

Block Diagram