19-0222; Rev 0; 5/05
Complete 450MHz Quadrature Transmitter
General Description
Features
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.
ꢀ 450MHz Operating Frequency
ꢀ +8dBm Output Power
-64dBc Typical ACPR at ±885ꢀHz Oꢁꢁfet
-66dBc Typical ACPR at ±±1±ꢂ5MHz Oꢁꢁfet
ꢀ ±00dB Power-Control Range
ꢀ Dual Synthefizer ꢁor RF and IF Local Ofcillatorf
ꢀ SPI/QSPI/MICROWIRE-Compatible 3-Wire
Interꢁace Buf
ꢀ Single-Sideband Upconverter
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).
ꢀ Directly Drivef External Power Ampliꢁier
Applications
Ordering Information
450MHz CDMA/WCDMA Phones
PKG
CODE
PART
TEMP RANGE PIN-PACKAGE
OFDM, cdma2000®, WCDMA, NMT
Wireless Data Links
48 Thin QFN-EP*
-40°C to +85°C
MAX2370ETM
T4877-3
(7mm x 7mm)
48 Thin QFN-EP*
(7mm x 7mm)
MAX2370ETM+ -40°C to +85°C
T4877+3
*EP = Exposed paddle.
+Denotes lead-free package.
Pin Configuration/
Functional Diagram
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
36
1
2
RFOUT
N.C.
REF
RF PLL
IF PLL
35
34
33
32
31
30
29
28
27
26
25
N.C.
3
LOCK
N.C.
Σ
4
V
N.C.
CCDRV
IDLE
0°
90°
MAX2370
5
N.C.
V
6
TANK+
TANK-
IFLO
CC
EP
+45
-45
7
TXGATE
IFIN+
IFIN-
N.C.
8
9
V
CC
10
11
12
SHDN
I-
0°
Σ
/2
SPI
INTERFACE
N.C.
90°
I+
RBIAS
________________________________________________________________ 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.