MAX2452ISE Fast Delivery |IC PHOENIX CO.,LIMITED

MAX2452ISE ,3V, ultra-low-power quadrature modulator.ApplicationsDigital Cordless Phones PART TEMP. RANGE PIN-PACKAGEMAX2452ISE* -20°C to +85°C 16 Narro ..
MAX245CPL ,+5V-Powered, Multichannel RS-232 Drivers/ReceiversMAX220–MAX24919-4323; Rev 9; 4/00+5V-Powered, Multichannel RS-232Drivers/Receivers
MAX2463EAI ,900MHz Image-Reject TransceiversELECTRICAL CHARACTERISTICS(V = +2.7V to +4.8V, no RF signals applied, LNAGAIN = TXGAIN = open, VCOO ..
MAX2470EUT ,10MHz to 500MHz, VCO Buffer Amplifiers with Differential Outputsapplications with♦ Input Frequency Rangediscrete and module-based VCO designs. Both featureHigh: 10 ..
MAX2470EUT+ ,10MHz to 500MHz, VCO Buffer Amplifiers with Differential OutputsApplicationsBIASActive Baluns OUTGeneral-Purpose Buffers/AmplifiersIN50WOUTPin Configuration50WGNDV ..
MAX2470EUT+T ,10MHz to 500MHz, VCO Buffer Amplifiers with Differential OutputsELECTRICAL CHARACTERISTICS—MAX2470 (continued)(V = +3V, HI/LO = V , all outputs are differentially ..
MAX5891EGK ,16-Bit, 600Msps, High-Dynamic-Performance DAC with LVDS InputsApplicationsBase Stations: Single/Multicarrier UMTS, MAX5891CDMA, GSM OUTPCommunications: Fixed Bro ..
MAX5891EGK+D ,16-Bit, 600Msps, High-Dynamic-Performance DAC with LVDS InputsApplicationsFunctional Diagram● Base Stations: Single/Multicarrier UMTS, CDMA, GSM● Communication ..
MAX5894EGK+D ,14-Bit, 500Msps, Interpolating and Modulating Dual DAC with CMOS InputsApplicationsMAX5894 14 500 CMOSBase Stations: 3G UMTS, CDMA, and GSMMAX5895 16 500 CMOSBroadband Wi ..
MAX5895EGK ,16-Bit, 500Msps Interpolating and Modulating Dual DAC with CMOS InputsApplicationsMAX5894** 14 500 CMOSBase Stations: 3G Multicarrier UMTS, CDMA, and GSMMAX5895 16 500 C ..
MAX5895EGK+D ,16-Bit, 500Msps Interpolating and Modulating Dual DAC with CMOS InputsApplicationsMAX5894 14 500 CMOSBase Stations: 3G Multicarrier UMTS, CDMA, and GSMMAX5895 16 500 CMO ..
MAX5898EGK+D ,16-Bit, 500Msps, Interpolating and Modulating Dual DAC with Interleaved LVDS InputsApplicationsBase Stations: 3G Multicarrier UMTS, CDMA, and GSMSimplified DiagramBroadband Wireless ..

MAX2452ISE
3V, ultra-low-power quadrature modulator.
_______________General Description
The monolithic MAX2452 is a quadrature modulator
with supporting oscillator and divide-by-8 prescaler. It
operates from a single +3V supply and draws only
4.1mA. The modulator accepts differential I and Q
baseband signals with amplitudes up to 1.35Vp-p and
bandwidths up to 15MHz. It produces a differential out-
put up to 80MHz.
Pulling the CMOS-compatible ENABLE pin low reduces
the supply current to 2µA. To minimize spurious feed-
back, the MAX2452’s internal oscillator is set at twice
the IF via external tuning components. The oscillator
and associated phase shifters produce differential sig-
nals exhibiting low amplitude and phase imbalance,
yielding 42dB sideband rejection. The MAX2452 comes
in a 16-pin narrow SO package.
________________________Applications
Digital Cordless Phones
GSM and North American Cellular Phones
Wireless LANs
Digital Communications
Two-Way Pagers
____________________________FeaturesIF Output Frequency up to 80MHzInput Bandwidth up to 15MHzOn-Chip Oscillator with External Tuning CircuitOn-Chip Divide-by-8 PrescalerIntegrated Quadrature Phase ShiftersSelf-Biased Differential Baseband InputsCMOS-Compatible Enable4.1mA Operating Supply Current
2µA Shutdown Supply Current
MAX2452, Ultra-Low-Power
Quadrature Modulator
________________________________________________________________Maxim Integrated Products1
__________________Pin Configuration
________________Functional Diagram
Call toll free 1-800-998-8800 for free samples or literature.
* An alternate marking, MAX2452CSE, has been identically tested.
MAX2452, Ultra-Low-Power
Quadrature Modulator_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC= LO_VCC= 2.7V to 3.3V, TA= -20°C to +85°C, unless otherwise noted.)
AC ELECTRICAL CHARACTERISTICS
(VCC= LO_VCC= 3.0V, fOSC= 140MHz, ENABLE = 2.6V, fII= fQQ= 600kHz, TA= -20°C to +85°C, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1:Guaranteed by design, not tested.
Note 2:The frequency range can be extended in either direction, but has not been characterized. At higher frequencies, the IF
output level may decrease and distortions may increase.
VCC, LO_VCCto GND............................................-0.3V to +4.5V
ENABLE, TANK, TANK, I, I, Q, Qto GND..................VCC+ 0.3V
Continuous Power Dissipation (TA= +70°C)
SO (derate 8.33mW/°C above +70°C)..........................667mW
Operating Temperature Range...........................-20°C to +85°C
Storage Temperature Range............................–65°C to +165°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX2452, Ultra-Low-Power
Quadrature Modulator
_______________________________________________________________________________________3
MAX2452-01
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
SUPPLY CURRENT
vs. TEMPERATURE
MAX2452-02
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
SUPPLY CURRENT (
MAX2452-03
BASEBAND INPUT (dBVRMS)
OUTPUT (dBV
RMS
IF OUTPUT
vs. BASEBAND INPUT
MAX2452-04
VCC (V)
IF OUTPUT (mVp-p)
IF OUTPUT
vs. SUPPLY VOLTAGE
MAX2452-07
TEMPERATURE (°C)
SIDEBAND REJECTION (dBc)
SIDEBAND REJECTION
vs. TEMPERATURE
MAX2452-05
TEMPERATURE (°C)
IF OUTPUT (mVp-p)
IF OUTPUT
vs. TEMPERATURE
MAX2452-06
IF FREQUENCY (MHz)
SIDEBAND REJECTION (dBc)
SIDEBAND REJECTION
vs. IF FREQUENCY
MAX2452-08
IF FREQUENCY (MHz)
LO LEAKAGE (dBc)
LO LEAKAGE
vs. IF FREQUENCY
__________________________________________Typical Operating Characteristics
(VCC= LO_VCC= 3.0V, fOSC= 140MHz, ENABLE = 2.6V, fII= fQQ= 600kHz, RL(IF, IF) = 200kΩdifferential, CL(IF, IF) < 5pF
differential, TA= +25°C, unless otherwise noted.)
MAX2452, Ultra-Low-Power
Quadrature Modulator_______________________________________________________________________________________
____________________________Typical Operating Characteristics (continued)
(VCC= LO_VCC= 3.0V, fOSC= 140MHz, ENABLE = 2.6V, fII= fQQ= 600kHz, RL(IF, IF) = 200kΩdifferential, CL(IF, IF) < 5pF
differential, TA= +25°C, unless otherwise noted.)
_____________________Pin Description
MAX2452, Ultra-Low-Power
Quadrature Modulator
_______________________________________________________________________________________5
_______________Detailed Description
The MAX2452 quadrature modulator integrates several
important RF functions on a single chip. It includes dif-
ferential buffers for the baseband inputs, two double-
balanced mixers, a local oscillator, a quadrature phase
generator, and a divide-by-8 prescaler. The prescaler
simplifies the implementation of a phase-locked loop.
Each of the functional blocks (shown in the Functional
Diagram) is described in detail in the following sec-
tions.
Local Oscillator
The local-oscillator section is formed by an emitter-cou-
pled differential pair. Figure 1 shows the equivalent
local-oscillator circuit schematic. An external LC reso-
nant tank determines the oscillation frequency, and the
Q of this resonant tank determines the phase noise of
the oscillator. The oscillation frequency is twice the IF
frequency, so that the quadrature phase generator can
use two latches to generate precise quadrature signals.
Quadrature Phase Generator
The quadrature phase generator uses two latches to
divide the local-oscillator frequency by two, and gener-
ates two precise quadrature signals. Internal limiting
amplifiers shape the signals to approximate square
waves to drive the Gilbert-cell mixers in the modulator.
The inphase signal (at half the local-oscillator frequen-
cy) is further divided by four for an external phase-
locked loop.
Modulator
The modulator accepts up to 1.35Vp-p I and Q differen-
tial baseband signals up to 15MHz, and upconverts
them to higher-frequency IF signals. Since these inputs
are biased internally at around 1.5V, you can improve
carrier suppression by externally capacitively coupling
the signals into these high-impedance ports (the differ-
ential input impedance is approximately 44kΩ). The
self-bias design is for very low on-chip offset, resulting
in excellent carrier suppression. The IF output is
designed to drive a high impedance (>20kΩ), such as
an IF buffer or an upconverter mixer.
Prescaler
The prescaler output, PRE_OUT, is buffered and
swings typically 0.35Vp-p with a 10kΩand 6pF load. It
can be AC-coupled to the input of a frequency synthe-
sizer.
Master Bias
During normal operation, ENABLE should remain above
VCC- 0.4V. Pulling the ENABLE input low shuts off the
master bias and reduces the circuit current to 2µA. The
master bias section includes a bandgap reference
generator and a PTAT (Proportional To Absolute
Temperature) current generator.
MAX2452, Ultra-Low-Power
Quadrature Modulator_______________________________________________________________________________________
Applications Information
The MAX2452 quadrature modulator is designed to
upconvert I and Q baseband signals to IF frequencies
up to 80MHz. Figure 2 shows a typical application
block diagram, in which the MAX2452 is used for the
first upconversion in a dual-conversion transmitter.
Figure 3 shows an implementation of a resonant tank
circuit. The inductor, two capacitors, and a dual varac-
tor form the resonant circuit of the oscillator. The fre-
quency range of the oscillator shown in Figure 3 is
130MHz to 160MHz. The inductor is directly connected
across the local oscillator’s tank ports so that it will not
lock up the oscillator in a stable state during start-up.
The two 33pF capacitors increase the Q of the resonant
circuit and reduce the VCO gain. They can be changed
to meet individual applications requirements. The oscil-
lation frequency can be determined using the following
formula:
CSTRAY, LSTRAY: parasitic capacitance and induc-
tance.
To alter the oscillation frequency range, change the
inductance, the capacitance, or both. Make sure the Q
of the resonant tank does not drop below 35.
where REQ= 10kΩ(see Figure 1).
The oscillation frequency can be changed by altering
the control voltage, VCTRL.

Partno	Mfg	Dc	Qty	Available	Descript
MAX2452ISE		N/a	14	avai	3V, ultra-low-power quadrature modulator.