LTC5599 - 30MHz to 1300MHz Low Power Direct Quadrature Modulator

Features

  • Frequency Range: 30MHz to 1300MHz
  • Low Power: 2.7V to 3.6V Supply; 28mA
  • Low LO Carrier Leakage: –51.5dBm at 500MHz
  • Side-Band Suppression: –52.6dBc at 500MHz
  • Output IP3: 20.8dBm at 500MHz
  • Low RF Output Noise Floor: –156dBm/Hz at 6MHz Offset, PRF = 3dBm
  • Sine Wave or Square Wave LO Drive
  • SPI Control:
    Adjustable Gain: –19dB to 0dB in 1dB Steps
    Effecting Supply Current from 8mA to 35mA
    I/Q Offset Adjust: –65dBm LO Carrier Leakage
    I/Q Gain/Phase Adjust: –60dBc Side-Band Suppressed
  • 24-Lead QFN 4mm × 4mm Package

Typical Application

LTC5599 Typical Application
LTC5599 Typical Application

Description

The LTC®5599 is a direct conversion I/Q modulator designed for low power wireless applications that enable direct modulation of differential baseband I and Q signals on an RF carrier. Single side-band modulation or side-band suppressed upconversion can be achieved by applying 90° phase-shifted signals to the I and Q inputs. The I/Q baseband input ports can be either AC or DC coupled to a source with a common mode voltage level of about 1.4V. The SPI interface controls the supply current, modulator gain, and allows optimization of the LO carrier feedthrough and side-band suppression, with sine wave or square wave LO drive. A fixed LC network on the LO and RF ports covers a continuous 90MHz to 1300MHz operation. An on-chip thermometer can be activated to compensate for gain-temperature variations. More accurate temperature measurements can be made using an on-chip diode. In addition, a continuous analog gain control (VCTRL) pin can be used for fast power control.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC5599IUF#PBF 4x4 QFN-24 UF I 05-08-1697 Yes
LTC5599IUF#TRPBF 4x4 QFN-24 UF I 05-08-1697 Yes


LTC5599 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC5599IUF#PBF 4x4 QFN-24 I $6.36 $4.45 Yes
LTC5599IUF#TRPBF 4x4 QFN-24 I $6.42 $4.50 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2091A LTC5599 | 30MHz to 1300MHz Low Power Direct I/Q Modulator - DC590B Serial Board Required $125.00
Buy Now

Companion Boards

Part Number Description Price Documentation
DC2026C Linduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform $75.00
DC590B Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards $50.00
Buy Now
Click here to view our complete list of demo boards

Applications

  • Wireless Microphones
  • Battery Powered Radios
  • Ad-Hoc Wireless Infrastructure Networks
  • “White-Space” Transmitters
  • Software Defined Radios (SDR)
  • Military Radios

Product Notifications

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Need help? Email mylinear@linear.com with questions and comments.

Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Linduino

Linduino is an Arduino compatible platform for developing and distributing firmware libraries and code for SPI and I²C-compatible integrated circuits. The Linduino One board interfaces to more than 300 QuikEval demonstration cards, supporting a variety of product types including analog-to-digital converters (ADCs)digital-to-analog converters (DACs)power monitors, and more. Firmware libraries for individual devices are written in C and designed to be portable to a wide variety of processors and microcontrollers. Each library has a demonstration program that can be uploaded to the Linduino One platform to allow the circuit and software to be quickly and easily verified.

Click here for more information on Linduino

Code

Linduino is Linear Technology's Arduino compatible system for developing and distributing firmware libraries and example code for Linear Technology’s integrated circuits. The code below can be downloaded or copied and pasted into your project. Please visit the Linduino Home Page for demo board, manual and setup information.

This part is Code Supported: There is example code available for this part. The code below may rely on other drivers available in the full library.

Download LTC5599 - DC2091A.INO

/*!
Linear Technology DC2091A Demonstration Board.
LTC5599: 130 to 1300MHz IQ Modulator.

@verbatim

NOTES
  Setup:
   Set the terminal baud rate to 115200 and select the newline terminator.

USER INPUT DATA FORMAT:
 decimal : 1024
 hex     : 0x400
 octal   : 02000  (leading 0 "zero")
 binary  : B10000000000
 float   : 1024.0

@endverbatim

http://www.linear.com/product/LTC5599

http://www.linear.com/product/LTC5599#demoboards

REVISION HISTORY
$Revision: 3018 $
$Date: 2014-12-01 15:53:20 -0800 (Mon, 01 Dec 2014) $

Copyright (c) 2013, Linear Technology Corp.(LTC)
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The views and conclusions contained in the software and documentation are those
of the authors and should not be interpreted as representing official policies,
either expressed or implied, of Linear Technology Corp.

The Linear Technology Linduino is not affiliated with the official Arduino team.
However, the Linduino is only possible because of the Arduino team's commitment
to the open-source community.  Please, visit http://www.arduino.cc and
http://store.arduino.cc , and consider a purchase that will help fund their
ongoing work.
*/

/*! @file
    @ingroup LTC5599
*/

#include <Arduino.h>
#include <stdint.h>
#include "Linduino.h"
#include "LT_SPI.h"
#include "UserInterface.h"
#include "LT_I2C.h"
#include "QuikEval_EEPROM.h"
#include "LTC5599.h"
#include <SPI.h>
#include <Wire.h>

// Function Declaration
void print_title();                                         // Print the title block
void print_prompt();                                        // Prompt the user for an input command
void print_user_command(uint8_t menu);                      // Display selected differential channels

void menu_1_read_register();
void menu_2_write_register();

//Global variables
uint8_t address;
uint8_t rw;
                                              
//! Initialize Linduino
void setup()
{
  char demo_name[]="DC2091";      //!< Demo Board Name stored in QuikEval EEPROM 
  quikeval_I2C_init();           // Configure the EEPROM I2C port for 100kHz
  quikeval_SPI_init();           // Configure the spi port for 4MHz SCK
  quikeval_SPI_connect();        // Connect SPI to main data port
  Serial.begin(115200);          // Initialize the serial port to the PC
  print_title();
  print_prompt();
}


//! Repeats Linduino loop
void loop()
{
  uint16_t user_command;

    if (Serial.available())
    {
      user_command = read_int();        // Read the user command
      if (user_command != 'm')
        Serial.println(user_command);   // Prints the user command to com port
      switch (user_command)
      {
        case 1:
          menu_1_read_register();
          break;
        case 2:
          menu_2_write_register();
          break;
        default:
          Serial.println("Invalid Option");
          break;
      }
      Serial.println();
      print_prompt();
    }
}


// Function Definitions
//! Read register
//! @ return void
void menu_1_read_register()
{
  uint8_t write_byte = 0;
  uint8_t readback_byte;
//  uint8_t address;

  Serial.println();
  Serial.print(F("Enter the desired register address in HEX (precede with '0x'): "));
  address = read_int();
  Serial.println(address, HEX);
  Serial.println(F(""));
 
  rw = LTC5599_READ;  //set to read
  LTC5599_write_read(LTC5599_CS, address, rw, write_byte, &readback_byte);
  
  Serial.println(F(""));
  Serial.print(F("Readback byte (in hex): "));
  Serial.println(readback_byte, HEX); 
  Serial.print(F("Readback byte (in binary): "));
  Serial.println(readback_byte, BIN); 
}


//! Write to register & readback
//! @ return void
void menu_2_write_register()
{
  uint8_t write_byte;
  uint8_t readback_byte;
//  uint8_t address;

  Serial.println();
  Serial.print(F("Enter the desired register address in HEX (precede with '0x'): "));
  address = read_int();
  Serial.println(address, HEX);
  Serial.println(F(""));
 
  Serial.println();
  Serial.print(F("Enter the desired register byte in HEX: "));
  write_byte = read_int();
  Serial.println(write_byte, HEX);
  Serial.println(F(""));  

  rw = LTC5599_WRITE;  //set to write 
  LTC5599_write_read(LTC5599_CS, address, rw, write_byte, &readback_byte);
  
  rw = LTC5599_READ;  //set to read
  LTC5599_write_read(LTC5599_CS, address, rw, write_byte, &readback_byte);
    
  Serial.print(F("Readback byte (in hex): "));
  Serial.println(readback_byte, HEX); 
  Serial.print(F("Readback byte (in binary): "));
  Serial.println(readback_byte, BIN);
}


//! Prints the title block when program first starts.
void print_title()
{
  Serial.println();
  Serial.println(F("*****************************************************************"));
  Serial.println(F("* DC2091A Demonstration Program                                 *"));
  Serial.println(F("*                                                               *"));
  Serial.println(F("* This program demonstrates how to send data                    *"));
  Serial.println(F("* to the LTC5599 IQ modulator.                                  *"));
  Serial.println(F("*                                                               *"));
  Serial.println(F("* Set the baud rate to 115200 and select the newline terminator.*"));
  Serial.println(F("*                                                               *"));
  Serial.println(F("*****************************************************************"));
}


//! Prints main menu.
void print_prompt()
{
  Serial.println(F(" 1-Read Register"));
  Serial.println(F(" 2-Write Register"));
  Serial.println();
  Serial.print(F("Enter a command: "));
}

Download LTC5599 - Linduino Header File

/*!
LTC5599: 140 to 1000MHz IQ modulator

@verbatim


@endverbatim

http://www.linear.com/product/LTC5599

http://www.linear.com/product/LTC5599#demoboards

REVISION HISTORY
$Revision: 3018 $
$Date: 2014-12-01 15:53:20 -0800 (Mon, 01 Dec 2014) $

Copyright (c) 2013, Linear Technology Corp.(LTC)
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The views and conclusions contained in the software and documentation are those
of the authors and should not be interpreted as representing official policies,
either expressed or implied, of Linear Technology Corp.

The Linear Technology Linduino is not affiliated with the official Arduino team.
However, the Linduino is only possible because of the Arduino team's commitment
to the open-source community.  Please, visit http://www.arduino.cc and
http://store.arduino.cc , and consider a purchase that will help fund their
ongoing work.
*/

/*! @file
    @ingroup LTC5599
    Header for LTC5599: Direct Conversion I/Q Modulator
*/

#ifndef LTC5599_H
#define LTC5599_H

#include <SPI.h>

//! Define the SPI CS pin
#ifndef LTC5599_CS
#define LTC5599_CS QUIKEVAL_CS
#endif

//! @name LTC5599 read/write bits
//! @{
// Write Command
#define LTC5599_WRITE      	0x00
// Read Command
#define LTC5599_READ   	  	0x01
//!@}


//! Reads the modulator register and returns 8-bit data
//! @return void
void LTC5599_write_read(uint8_t cs,           //!< Chip Select Pin 
					uint8_t address,  //!< Channel address, config bits ORed together
					uint8_t rw,
					uint8_t tx,
					uint8_t *rx    //!< Returns code read from device
                 );

#endif  //  LTC5599_H

Download LTC5599 - Linduino.CPP File

/*!
LTC5599: 140 to 1000MHz IQ modulator

@verbatim

The LTC5599 is an IQ modulator with 
serial I/O.  

@endverbatim

http://www.linear.com/product/LTC5599

http://www.linear.com/product/LTC5599#demoboards

REVISION HISTORY
$Revision: 3028 $
$Date: 2014-12-02 16:42:48 -0800 (Tue, 02 Dec 2014) $

Copyright (c) 2013, Linear Technology Corp.(LTC)
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The views and conclusions contained in the software and documentation are those
of the authors and should not be interpreted as representing official policies,
either expressed or implied, of Linear Technology Corp.

The Linear Technology Linduino is not affiliated with the official Arduino team.
However, the Linduino is only possible because of the Arduino team's commitment
to the open-source community.  Please, visit http://www.arduino.cc and
http://store.arduino.cc , and consider a purchase that will help fund their
ongoing work.
*/

//! @defgroup LTC5599 LTC5599: Direct Conversion I/Q Modulator

/*! @file
    @ingroup LTC5599
    Library for LTC5599: Direct Conversion I/Q Modulator
*/

#include <Arduino.h>
#include <stdint.h>
#include "Linduino.h"
#include "LT_SPI.h"
#include "LTC5599.h"
#include <SPI.h>
#include <math.h>


// Reads and returns 8-bit data
void LTC5599_write_read(uint8_t cs, uint8_t address, uint8_t rw, uint8_t tx, uint8_t *rx)
{
  address = address << 1;
  union
  { 
    uint8_t b[2];
    uint16_t w;
  } command, data;

  if(rw == 0)	//write
  {
    command.b[1] = address;
    command.b[0] = tx;	//write this command byte

    spi_transfer_word(cs,command.w,&data.w);	//write an address byte and a command byte to the device
  }
  else
  {
    address = address + 0x01;
    command.b[1] = address;
    command.b[0] = 0x00;	//read into this data byte

    spi_transfer_word(cs,command.w,&data.w);	//write an address byte to the device and read back a byte
    *rx = data.b[0];
  }
}

Technical Support