NOISE FLOOR (dBm/Hz)
LTC5589
700MHz to 6GHz
Low Power
Direct Quadrature Modulator
Fea T Descrip T
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Frequency Range: 700MHz to 6GHz
The LTC 5589 is a direct conversion I/Q modulator de-
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Low Power: 2.7V to 3.6V Supply; 29.5mA
signed for low power wireless applications that enables
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Low LO Carrier Leakage: 43dBm at 1.8GHz
direct modulation of differential baseband I and Q signals
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Side-Band Suppression: 50dBc at 1.8GHz
on an RF carrier. Single side-band modulation or side-band
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Output IP3: 19dBm at 1.8GHz
suppressed upconversion can be achieved by applying
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Low RF Output Noise Floor: 157dBm/Hz at 30MHz
90 phase-shifted signals to the I and Q inputs. The I/Q
Offset, P = 1.8dBm, f = 2.17GHz
baseband input ports can be either AC or DC coupled to a
RF RF
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Sine Wave or Square Wave LO Drive
source with a common mode voltage level of about 1.4V.
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SPI Control:
The SPI interface controls the supply current, modulator
Adjustable Gain: 19dB in 1dB Steps
gain, and allows adjustments of I and Q gain and phase
Effecting Supply Current from 9mA to 39mA
imbalance to optimize the LO carrier feedthrough and
I/Q Offset Adjust: 64dBm LO Carrier Leakage
side-band suppression. The LO port can be driven with
I/Q Gain/Phase Adjust: 61dBc Side-Band Suppressed
sine wave or square wave LO drive. A fixed LC network
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24-Lead 4mm 4mm Plastic QFN Package
on the LO and RF ports covers 700MHz to 6GHz operat-
ing range. An on-chip thermometer can be activated to
compensate for gain-temperature variations. More ac-
a T
curate temperature measurements can be made using
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Wireless Microphones an on-chip diode. In addition, a continuous analog gain
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Battery Powered Radios control (V ) pin can be used for fast power control.
CTRL
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Vector Modulator 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
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2.45GHz and 5.8GHz Transmitters
of their respective owners.
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Software Defined Radios (SDR)
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Military Radios
Typical a T
EVM and Noise Floor vs RF Output
Power and Digital Gain Setting
700MHz to 6GHz Direct Conversion Transmitter Application
with 1Ms/s 16-QAM Signal
V
CTRL
3.3V
5
1nF + 4.7F DG 19, 8.7mA
4 DG 16, 12.7mA
V LTC5589
CC
DG 12, 17.1mA
3
SPI DG 8, 22.3mA
DG 4, 29.5mA
2
DG 0, 39.2mA
RF = 700MHz
1
TO 6GHz
I-DAC V I I-CHANNEL
100pF
0 155
PA
157
0
0.2pF 159
EN EN
90
161
f = 2.17GHz
LO 163
P = 0dBm
Q-DAC V I Q-CHANNEL
LO
165
THERMOMETER TTCK
20 16 12 8 4 0 4
RF POWER (dBm)
BASEBAND
5589 TA01b
GENERATOR
0.8nH
VCO/SYNTHESIZER
0.1pF
0.4pF 5589 TA01a
5589f
1
For more information www.linear.com/LTC5589
RMS EVM (%)
ion pplica
ions pplica
ion uresLTC5589
a T e Maxi Mu M r a T p c F T
(Note 1)
TOP VIEW
Supply Voltage .........................................................3.8V
Common Mode Voltage of BBPI, BBMI,
24 23 22 21 20 19
and BBPQ, BBMQ ........................................................2V
V 1 18 GND
LOL, LOC DC Voltage ...........................................50mV CTRL
GND GND
2 17
LOL, LOC Input Power (Note 15) ..........................20dBm
GND
LOL 3 16 RF
Output Current TEMP, SDO ....................................10mA
25
LOC 4 15 GND
Voltage on Any Pin (Note 16) ...........0.3V to V + 0.3V
CC
GND 5 14 GND
T .................................................................... 150C
JMAX
TTCK 6 13 GND
Case Operating Temperature Range........40C to 105C
7 8 9 10 11 12
Storage Temperature Range .................. 65C to 150C
UF PACKAGE
24-LEAD (4mm 4mm) PLASTIC QFN
T = 150C, = 7C/W
JMAX JC
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
o r D i n F Ma T
(