19-2389; Rev 1; 8/03
Wideband I/Q Modulator with Sigma-Delta
Fractional-N Synthesizer
General Description
Features
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.
ꢀ Single Voltage Supply (2.7V to 3.6V)
ꢀ 75MHz 3dB I/Q Input Bandwidth
ꢀ Wideband 50Ω RF Output: 700MHz to 2300MHz
ꢀ Ultra-Fine Frequency Resolution: 100mHz
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 50Ω wideband output driver amplifier.
ꢀ High Reference Frequency for Fast-Switching
Applications
ꢀ Ultra-Low Phase Noise
ꢀ Low Spurious and Reference Emissions
ꢀ -1dBm RMS Output Power
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.
ꢀ 60dB RF Muting Control
ꢀ 34dBc Typical Carrier Suppression
ꢀ 34dBc Typical Sideband Suppression
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.
ꢀ Software- and Hardware-Controlled Shutdown
Modes
The device consumes 72mA from a single +3.0V sup-
ply and is packaged in an ultra-compact 28-pin QFN
Ordering Information
✕
package (5mm 5mm) with an exposed pad.
PART
TEMP RANGE
PIN-PACKAGE
MAX2150ETI
-40°C to +85°C
28 Thin QFN-EP*
Applications
*EP = exposed pad.
Wireless Broadband
Satellite Uplink
LMDS
Pin Configuration/
Functional Diagram
Wireless Base Station
VCC_RF I+
I-
Q+
25
Q-
24
BUFEN BUFOUT
23 22
28
27
26
LO+
LO-
TXEN
21
20
19
1
2
VCC_PA
0
VCC_LO
RFOUT
N.C.
3
4
90
18 VCC_D
N.C.
LOCK
5
6
7
1/N
17
16
VCC_A
CHP
MAX2150
∑ ∆ – MOD
PFD CHP
1/R
PROGRAMMING
AND CONTROL
VCC_SD
15 VCC_CHP
12
13
14
10
EN
11
8
9
CLK DATA
SHDN SYNEN OSCIN VCC_XTAL
QFN
________________________________________________________________ Maxim Integrated Products
1
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.