MAX2150 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Wideband I/Q Modulator with Sigma-Delta Fractional-N Synthesizer

19-2389; Rev 1; 8/03
Wideband I/Q Modulator with Sigma-Delta
Fractional-N Synthesizer
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 50Ω 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 50Ω 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
Ordering Information
PART
MAX2150ETI
TEMP RANGE
-40°C to +85°C
*EP = exposed pad.
PIN-PACKAGE
28 Thin QFN-EP*
Pin Configuration/
Functional Diagram
VCC_RF I+
I-
Q+ Q- BUFEN BUFOUT
28 27 26 25 24 23 22
TXEN 1
VCC_PA ₂
RFOUT 3
N.C. 4
N.C. 5
LOCK 6
VCC_SD 7
0
90
MAX2150
∑ ∆ – MOD
PROGRAMMING
AND CONTROL
21 LO+
20 LO-
19 VCC_LO
18 VCC_D
1/N
17 VCC_A
PFD CHP
1/R
16 CHP
15 VCC_CHP
8
9
CLK DATA
10 11
12 13 14
EN SHDN SYNEN OSCIN VCC_XTAL
QFN
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