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19-2970; Rev 3; 1/09
ATION
EVALU
AVAILA
KIT
B LE
WCDMA Quasi-Direct Modulator
with VGA and PA Driver
General Description
The MAX2395 fully monolithic quasi-direct modulator IC
is designed for use in WCDMA/UMTS transmitters. The
quasi-direct modulation architecture reduces system
cost, component count, and board space compared to
transmitters using an IF SAW filter with IF VCO and IF
synthesizer blocks.
The MAX2395 includes I/Q baseband filters, an IF I/Q
modulator with VGA, a fully monolithic VCO with PLL,
an upconverter mixer, an RF VGA, and a power amplifi-
er (PA) driver. The use of the quasi-direct modulator
scheme ensures 5% (typ) EVM and a 30dB (min) carri-
er suppression. The RF VGA and IF VGA provide a
nominal 90dB of output power control. No external local
oscillators are required, enabling efficient implementa-
tion of variable duplex offset systems.
The PLL is programmed by loading data on the SPI?/
MICROWIRE?-compatible 3-wire serial bus. The IC
operates from a single +2.7V to +3.3V supply. The
devices are available in space-saving 28-pin QFN and
thin QFN exposed-pad packages (5mm x 5mm).
Features
o 5% EVM for P OUT = +6dBm
o 1920MHz to 1980MHz Operation
o +2.7V to +3.3V Single-Supply Operation
o +6dBm Output Power at 72mA
o 81dB Minimum Automatic Gain-Control (AGC)
Range
o Automatic I CC Throttle Back for Optimal Power
Consumption
o No IF SAW Filter Necessary
o On-Chip RF PLL, with Fully Monolithic VCO
o Ultra-Low External Component Count
Ordering Information
WCDMA Phones
UMTS/EDGE Phones
W-TDD Phones
Applications
PART
MAX2395EGI
MAX2395ETI
MAX2395ETI+
*EP = Exposed pad.
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QFN-EP*
28 TQFN-EP*
28 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration/
Functional Diagram
+
28
27
26
25
24
23
22
N.C.
POUT
1
2
SERIAL
BUS
21
20
GND_VCO
V CC_ VCO
RF
V CC_ PA
3
INTEGER-N
19
RFCP
LO
PLL
BIAS_SET
4
GEN
18
V CC_ CP
SPI is a trademark of Motorola, Inc.
VGC
5
0 °
90 °
MAX2395
17
V CC_ PLL
MICROWIRE is a trademark of National Semiconductor Corp.
V CC_ IF
V CC_ BB
6
7
16
15
REF
LD
8
9
10
11
12
13
14
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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