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LTC5599

Description
30mhz to 1300mhz low power direct quadrature modulator
CategoryTopical application    Wireless rf/communication   
File Size2MB,42 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Compare View All

LTC5599 Overview

30mhz to 1300mhz low power direct quadrature modulator

FeaTures
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LTC5599
30MHz to 1300MHz
Low Power
Direct Quadrature Modulator
DescripTion
The
LTC
®
5599
is a direct conversion I/Q modulator de-
signed 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 (V
CTRL
) pin
can be used for fast power control.
L,
LT, LTC, LTM, Linear Technology, and the Linear logo are registered trademarks and
QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
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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, P
RF
= 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
applicaTions
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Wireless Microphones
Battery Powered Radios
Ad-Hoc Wireless Infrastructure Networks
“White-Space” Transmitters
Software Defined Radios (SDR)
Military Radios
Typical applicaTion
90MHz to 1300MHz Direct Conversion Transmitter Application
V
CTRL
1nF + 4.7µF
V
CC
SPI
LTC5599
3.3V
EVM and Noise Floor vs RF Output
Power and Digital Gain Setting
with 1Ms/s 16-QAM Signal
10
9
8
7
6
5
4
3
2
1
0
DG = –19
DG = –16
DG = –12
DG = –8
DG = –4
DG = 0
–105
–115
–125
–135
–145
–155
I-DAC
V
I
I-CHANNEL
10nF
PA
EN
90°
Q-DAC
BASEBAND
GENERATOR
VCO/SYNTHESIZER
V
I
Q-CHANNEL
RMS EVM (%)
RF = 90MHz
to 1300MHz
THERMOMETER
TTCK
–15
–10
–5
0
RF OUTPUT POWER (dBm)
5
5599 TA01b
–165
39nH
15pF
5599 TA01a
5599f
For more information
www.linear.com/LTC5599
1

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LTC5599 LTC5599IUF#PBF LTC5599IUF#TRPBF
Description 30mhz to 1300mhz low power direct quadrature modulator IC MODULATOR QUAD 24QFN IC MODULATOR QUAD 24QFN
LO frequency - 180MHz ~ 1.9GHz 180MHz ~ 1.9GHz
RF frequency - 30MHz ~ 1.3GHz 30MHz ~ 1.3GHz
P1dB - 5dBm 5dBm
noise floor - -156dBm/Hz -156.6dBm/Hz
Current - Power - 28mA 28mA
Voltage - Power - 2.7 V ~ 3.6 V 2.7 V ~ 3.6 V
Test frequency - 150MHz 500MHz
Package/casing - 24-WFQFN Exposed Pad 24-WFQFN Exposed Pad
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