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ATION
EVALU
AVAIL
19-0222; Rev 0; 5/05
KIT
ABLE
Complete 450MHz Quadrature Transmitter
General Description
The MAX2370 integrated quadrature transmitter is
designed for 450MHz applications. The device takes a
differential I/Q baseband input and converts it up to
intermediate frequency (IF) through a quadrature modu-
lator and IF variable-gain amplifier (VGA). The signal is
then routed to an external IF filter and upconverted to RF
through an image-reject mixer and RF VGA. The signal
is further amplified with an on-chip power amplifier (PA)
driver. An IF synthesizer, an RF synthesizer, a local
oscillator buffer, and an SPI?/QSPI?/MICROWIRE?-
compatible, 3-wire programmable bus complete the
basic functional blocks of this IC.
The MAX2370 is available in a 48-pin TQFN package
with exposed paddle and is specified for the extended
temperature range (-40°C to +85°C).
Applications
Features
o 450MHz Operating Frequency
o +8dBm Output Power
-64dBc Typical ACPR at ±885kHz Offset
-66dBc Typical ACPR at ±1.125MHz Offset
o 100dB Power-Control Range
o Dual Synthesizer for RF and IF Local Oscillators
o SPI/QSPI/MICROWIRE-Compatible 3-Wire
Interface Bus
o Single-Sideband Upconverter
o Directly Drives External Power Amplifier
Ordering Information
450MHz CDMA/WCDMA Phones
OFDM, cdma2000 ? , WCDMA, NMT
PART
TEMP RANGE PIN-PACKAGE
PKG
CODE
Wireless Data Links
MAX2370ETM
MAX2370ETM+
-40 ° C to +85 ° C
-40 ° C to +85 ° C
48 Thin QFN-EP*
(7mm x 7mm)
48 Thin QFN-EP*
(7mm x 7mm)
T4877-3
T4877+3
* EP = Exposed paddle.
+ Denotes lead-free package.
Pin Configuration/
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
cdma2000 is a registered trademark of Telecommunications
Industry Association.
TOP VIEW
Functional Diagram
RFOUT
1
36
REF
N.C.
2
RF PLL
IF PLL
35
N.C.
LOCK
V CCDRV
IDLE
3
4
5
Σ
0 °
90 °
MAX2370
34
33
32
N.C.
N.C.
N.C.
V CC
TXGATE
6
7
+45
-45
EP
31
30
TANK+
TANK-
IFIN+
IFIN-
8
9
29
28
IFLO
V CC
N.C.
N.C.
10
11
SPI
INTERFACE
Σ
0 °
90 °
/2
27
26
SHDN
I-
RBIAS
12
25
I+
________________________________________________________________ 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.
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