LTC5588-1 Datasheet, PDF (1/30 Pages) Linear Technology – 200MHz to 6000MHz Quadrature Modulator with Ultrahigh OIP3

FEATURES
n _{Frequency Range: 200MHz to 6000MHz}
n _{Output IP3: +31dBm Typical at 2140MHz (Uncalibrated)}
+35dBm Typical (User Optimized)
n _{Single Pin Calibration to Optimize OIP3}
n _{Low Output Noise Floor at 6MHz Offset:}
No RF: –160.6dBm/Hz
P_OUT = 5dBm: –155.5dBm/Hz
n _{Integrated LO Buffer and LO Quadrature Phase}
Generator
n _{High Impedance DC Interface to Baseband Inputs}
with 0.5V Common Mode Voltage*
n _{50Ω Single-Ended LO and RF Ports}
n _{3.3V Operation}
n _{Fast Turn-Off/On: 10ns/17ns}
n _{Temperature Sensor (Thermistor)}
n _{24-Lead UTQFN 4mm × 4mm Package}
APPLICATIONS
n _{LTE, GSM/EDGE, W-CDMA, TD-SCDMA, CDMA2K,}
WiMax Basestations
n _{Image Reject Upconverters}
n _{Point-to-Point Microwave Links}
n _{Broadcast Modulator}
n _{Military Radio}
LTC5588-1
200MHz to 6000MHz
Quadrature Modulator
with Ultrahigh OIP3
DESCRIPTION
The LTC^®5588-1 is a direct conversion I/Q modulator
designed for high performance wireless applications. It
allows direct modulation of an RF signal using differential
baseband I and Q signals. It supports LTE, GSM, EDGE,
TD-SCDMA, CDMA, CDMA2000, W-CDMA, WiMax and
other communication standards. It can also be config-
ured as an image reject upconverting mixer, by applying
90° phase-shifted signals to the I and Q inputs. The I/Q
baseband inputs drive double-balanced mixers. An on-
chip balun converts the differential mixer signals to a 50Ω
single-ended RF output. Four balanced I and Q baseband
input ports are DC-coupled with a common mode volt-
age level of 0.5V. The LO path consists of an LO buffer
with single-ended or differential inputs and precision
quadrature generators to drive the mixers. The supply
voltage range is 3.15V to 3.45V. An external voltage can
be applied to the LINOPT pin to further improve 3rd-order
linearity performance. Accurate temperature dependent
calibrations can be performed using the on-chip thermistor.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
*Contact LTC Marketing for other common mode voltage versions.
TYPICAL APPLICATION
200MHz to 6000MHz Direct Conversion Transmitter Application
I-DAC
EN
Q-DAC
BASEBAND
GENERATOR
V_CC
VmI
I-CHANNEL
0o
90o
Q-CHANNEL
LTC5588-1
6.8pF
3.3V
1nF + 4.7μF
s2
RF = 200MHz
TO 6000MHz
PA
0.2pF
VmI
1nF
50Ω
LINOPT
1nF
VCO/SYNTHESIZER
LTC2630
55881 TA01a
ACPR, AltCPR and ACPR, AltCPR
with Optimized LINOPT Voltage vs RF
Output Power at 2.14GHz for
W-CDMA 1, 2 and 4 Carriers
–40
ACPR
ACPR (OPT) ^4C
–50
AltCPR
AltCPR (OPT)
DOWNLINK TEST
–60
MODEL 64 DPCH
f_BB = 140MHz,
f_LO = 2280MHz
2C
1C
–70
–80
–90
–20 –15 –10 –5
0
5
RF OUTPUT POWER PER CARRIER (dBm) 55881 TA01b
55881fb
1