Features: . RF Frequency Range
1.7GHz to 2.1GHz (MAX2720)
2.1GHz to 2.5GHz (MAX2721)
. Integrated I/Q Modulator, LO Doubler, VGA, and
PA Driver
. 35dB VGA Gain Control Range
. 35dBc Sideband Suppression
. 30dBc Carrier Suppression
. Low Supply Current
77mA (MAX2720), 86mA (MAX2721)
20mA Reduction with PA Driver Disabled
. 0.1µA Supply Current in Shutdown Mode
. +2.7V to +3.3V Single-Supply OperationApplicationWireless Local Loop (WLL)
Wideband CDMA Systems
LMDS/MMDS
2.4GHz Broadband ISM Radios
DCS/PCS Base StationsPinout
SpecificationsVCCto GND................................................................-0.3V to +6V
ENX2, SHDN, PC, I+, I-, Q+, Q-, LO,
DRIN to GND.................................................-0.3V to (VCC+ 0.3V)
ENX2, SHDNContinuous Current.........................................±10mA
PC Continuous Current.......................................................±10mA
I+ to I-, Q+ to Q-....................................................................±2V
MODOUT, DROUT to GND Short-Circuit Duration......................10s
Continuous Power Dissipation (TA= +70°C)
20-Pin TSSOP-EP (derate 21.7mW/°C above +70°C)..........1.74W
Operating Temperature Range.............................-40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range..............................-65°C to +150°C
Lead Temperature (soldering 10s)...................................+300°C
DescriptionThe MAX2720/MAX2721 are low-cost, high-performance,direct I/Q modulators designed for use in wideband-CDMA and wireless local-loop (WLL) systems. Theirdirect-upconversion architecture reduces system cost,component count, and board space compared todevices with dual-conversion architectures.
The MAX2720/MAX2721 include an I/Q modulator, avariable gain amplifier (VGA), and a power amplifier(PA) driver. The quadrature modulator accepts differentialbaseband I/Q signals and directly modulates an RFcarrier in the 1.7GHz to 2.1GHz range (MAX2720) orthe 2.1GHz to 2.5GHz range (MAX2721). The VGA pro-vides 35dB of output power control. The modulator'samplitude and phase balance yield 35dBc of sidebandsuppression and 30dBc of carrier suppression. Thesedevices feature an LO frequency doubler that allowsthe external LO source to operate at half-frequency orfull-frequency when disabled.
The MAX2720/MAX2721 operate from a single +2.7V to+3.3V supply and require only 77mA (MAX2720) or86mA (MAX2721) of supply current. An additional20mA of supply current is saved by disabling thestand-alone PA driver. A low-power shutdown modefurther reduces supply current to less than 0.1µA. Thedevice is packaged in the small 20-pin TSSOP-EP withexposed paddle to improve RF performance.
MAX2721 Data Sheet
