SLWS223B August   2011  – November 2015 TRF3705

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics: General
    6. 6.6  Electrical Characteristics
    7. 6.7  Typical Characteristics: Single-Tone Baseband
    8. 6.8  Typical Characteristics: Two-Tone Baseband
    9. 6.9  Typical Characteristics: Two-Tone Baseband, Mid-Band Calibration
    10. 6.10 Typical Characteristics: No Baseband
    11. 6.11 Typical Characteristics: Two-Tone Baseband
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Gain Control Feature
    4. 7.4 Device Functional Modes
      1. 7.4.1 Power Down Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Baseband Inputs
        2. 8.2.2.2 LO Input
        3. 8.2.2.3 RF Output
        4. 8.2.2.4 350-MHz Operation
        5. 8.2.2.5 DAC to Modulator Interface Network
        6. 8.2.2.6 DAC348x with TRF3705 Modulator Performance
          1. 8.2.2.6.1 WCDMA
          2. 8.2.2.6.2 LTE
          3. 8.2.2.6.3 MC-GSM
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Definition of Specifications
        1. 11.1.1.1 Carrier Feedthrough
        2. 11.1.1.2 Sideband Suppression
        3. 11.1.1.3 Output Noise
        4. 11.1.1.4 Definition of Terms
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

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.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TRF3705 VQFN (24) 4.00 mm x 4.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Block Diagram

TRF3705 fbd_lws223.gif