MAX2440 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 900MHz Image-Reject Receivers

19-1352; Rev 3; 8/03
EVAALVUAAILTAIOBNLEKIT
900MHz Image-Reject Receivers
General Description
The MAX2440/MAX2441/MAX2442 highly integrated
front-end receiver ICs provide the lowest cost solution for
cordless phones and ISM-band radios operating in the
900MHz band. All devices incorporate receive image-
reject mixers to reduce filter cost. They operate with a
+2.7V to +4.8V power supply, allowing direct connection
to a 3-cell battery stack.
The signal path incorporates an adjustable-gain LNA
and an image-reject downconverter with 35dB image
suppression. These features yield excellent combined
downconverter noise figure (4dB) and high linearity with
an input third-order intercept point (IP3) of up to +2dBm.
All devices include an on-chip local oscillator (LO),
requiring only an external varactor-tuned LC tank for
operation. The integrated divide-by-64/65 dual-modulus
prescaler can also be set to a direct mode, in which it
acts as an LO buffer amplifier. Three separate power-
down inputs can be used for system power manage-
ment, including a 0.5µA shutdown mode. These parts
are compatible with commonly used modulation
schemes such as FSK, BPSK, and QPSK, as well as fre-
quency hopping and direct sequence spread-spectrum
systems. All devices come in a 28-pin SSOP package.
Evaluation kits are available for the MAX2420/
MAX2421/MAX2422. The MAX2420/MAX2421/MAX2422
are transceivers whose receive sections and pinout are
identical to the MAX2440/MAX2441/MAX2442.
For complete transceiver devices, refer to the MAX2420/
MAX2421/MAX2422/MAX2460/MAX2463 and MAX2424/
MAX2426 data sheets.
________________________Applications
Cordless Phones
Wireless Telemetry
Wireless Networks
Spread-Spectrum Communications
Two-Way Paging
______________________Selector Guide
PART
MAX2440
MAX2441
MAX2442
IF FREQ
(MHz)
10.7
46
70
INJECTION
TYPE
High side
High side
High side
LO FREQ
(MHz)
f_RF + 10.7
f_RF + 46
f_RF + 70
Features
o Receive Mixer with 35dB Image Rejection
o Adjustable-Gain LNA
o Up to +2dBm Combined Receiver Input IP3
o 4dB Combined Receiver Noise Figure
o Low Current Consumption:
23mA Receive
9.5mA Oscillator
o 0.5µA Shutdown Mode
o Operates from Single +2.7V to +4.8V Supply
_______________Ordering Information
PART
MAX2440EAI
MAX2441EAI
MAX2442EAI
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 SSOP
28 SSOP
28 SSOP
Functional Diagram appears at end of data sheet.
___________________Pin Configuration
TOP VIEW
V_{CC 1}
CAP1 2
RXOUT 3
GND 4
RXIN 5
V_{CC 6}
GND 7
GND 8
GND 9
LNAGAIN 10
V_{CC 11}
GND 12
GND 13
GND 14
MAX2440
MAX2441
MAX2442
SSOP
28 GND
27 GND
26 GND
25 TANK
24 TANK
23 VCC
22 ^VCC
21 PREOUT
20 PREGND
19 MOD
18 DIV1
17 VCOON
16 RXON
15 GND
________________________________________________________________ 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.