
General Description
The MAX2150 is a complete wideband direct upconver-
sion quadrature modulator IC incorporating a 28-bit
sigma-delta fractional-N synthesizer. The device is tar-
geted for applications in the 700MHz to 2300MHz fre-
quency range.
The super-high-resolution sigma-delta fractional-N syn-
thesizer is capable of better than 50mHz resolution
when used with a 10MHz reference. Other features:
fully differential I/Q modulation inputs, an internal LO
buffer, and a 50
wideband output driver amplifier.
A standard 3-wire interface is provided for synthesizer
programming and overall device configuration. An on-
chip low-noise crystal oscillator amplifier is also includ-
ed and can be configured as a buffer when an external
reference oscillator is used.
The device typically achieves 34dBc of carrier and side-
band suppression at a -1dBm output level. The wide-
band, internally matched RF output can also
be disabled while the synthesizer and 3-wire bus remain
powered up for continuous programming.
The device consumes 72mA from a single +3.0V sup-
ply and is packaged in an ultra-compact 28-pin QFN
package (5mm
5mm) with an exposed pad.
Applications
Wireless Broadband
Satellite Uplink
LMDS
Wireless Base Station
Features
o
Single Voltage Supply (2.7V to 3.6V)
o
75MHz 3dB I/Q Input Bandwidth
o
Wideband 50
RF Output: 700MHz to 2300MHz
o
Ultra-Fine Frequency Resolution: 100mHz
o
High Reference Frequency for Fast-Switching
Applications
o
Ultra-Low Phase Noise
o
Low Spurious and Reference Emissions
o
-1dBm RMS Output Power
o
60dB RF Muting Control
o
34dBc Typical Carrier Suppression
o
34dBc Typical Sideband Suppression
o
Software- and Hardware-Controlled Shutdown
Modes
M
Wideband I/Q Modulator with Sigma-Delta
Fractional-N Synthesizer
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
RFOUT
N.C.
N.C.
TXEN
VCC_PA
VCC_RF
4
1
2
5
6
7
28
27
26
25
24
23
22
15
16
17
18
19
20
21
MAX2150
∑
– MOD
90
0
PROGRAMMING
AND CONTROL
CLK
DATA
SYNEN
QFN
OSCIN VCC_XTAL
I+
Q+
I-
Q-
BUFOUT
BUFEN
LO+
LO-
VCC_LO
VCC_D
VCC_A
CHP
VCC_CHP
LOCK
VCC_SD
1/N
1/R
PFD
CHP
EN
SHDN
8
9
10
11
12
13
14
3
Pin Configuration/
Functional Diagram
Ordering Information
19-2389; Rev 1; 8/03
PART
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 Thin QFN-EP*
MAX2150ETI
*
EP = exposed pad.