MAX2720 Datasheet, PDF (1/24 Pages) Maxim Integrated Products – 1.7GHz to 2.5GHz, Direct I/Q Modulator with VGA and PA Driver

19-1606; Rev 0; 1/00
1.7GHz to 2.5GHz, Direct I/Q Modulator with
VGA and PA Driver
General Description
The MAX2720/MAX2721 are low-cost, high-performance,
direct I/Q modulators designed for use in wideband-
CDMA and wireless local-loop (WLL) systems. Their
direct-upconversion architecture reduces system cost,
component count, and board space compared to
devices with dual-conversion architectures.
The MAX2720/MAX2721 include an I/Q modulator, a
variable gain amplifier (VGA), and a power amplifier
(PA) driver. The quadrature modulator accepts differential
baseband I/Q signals and directly modulates an RF
carrier in the 1.7GHz to 2.1GHz range (MAX2720) or
the 2.1GHz to 2.5GHz range (MAX2721). The VGA pro-
vides 35dB of output power control. The modulator’s
amplitude and phase balance yield 35dBc of sideband
suppression and 30dBc of carrier suppression. These
devices feature an LO frequency doubler that allows
the external LO source to operate at half-frequency or
full-frequency when disabled.
The MAX2720/MAX2721 operate from a single +2.7V to
+3.3V supply and require only 77mA (MAX2720) or
86mA (MAX2721) of supply current. An additional
20mA of supply current is saved by disabling the
stand-alone PA driver. A low-power shutdown mode
further reduces supply current to less than 0.1µA. The
device is packaged in the small 20-pin TSSOP-EP with
exposed paddle to improve RF performance.
Features
o RF Frequency Range
1.7GHz to 2.1GHz (MAX2720)
2.1GHz to 2.5GHz (MAX2721)
o Integrated I/Q Modulator, LO Doubler, VGA, and
PA Driver
o 35dB VGA Gain Control Range
o 35dBc Sideband Suppression
o 30dBc Carrier Suppression
o Low Supply Current
77mA (MAX2720), 86mA (MAX2721)
20mA Reduction with PA Driver Disabled
o 0.1µA Supply Current in Shutdown Mode
o +2.7V to +3.3V Single-Supply Operation
PART
MAX2720EUP
MAX2721EUP
*Exposed paddle.
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 TSSOP-EP*
20 TSSOP-EP*
Applications
Wireless Local Loop (WLL)
Wideband CDMA Systems
LMDS/MMDS
2.4GHz Broadband ISM Radios
DCS/PCS Base Stations
Pin Configuration appears at end of data sheet.
Functional Diagram
MAX2720/MAX2721
GND 1
DROUT 2
SHDN 3
V_CC 4
GND 5
V_CC 6
I- 7
I+ 8
V_CC 9
GND 10
PA DRIVER
VGA
Σ
90°
0°
BIAS
x2
LO DOUBLER
20 DRIN
19 GND
18 PC
17 MODOUT
16 ENX2
15 V_CC
14 Q-
13 Q+
12 V_CC
11 LO
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