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MAX2426

Description
900MHz Image-Reject Receivers with Transmit Mixer
File Size158KB,14 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet Compare View All

MAX2426 Overview

900MHz Image-Reject Receivers with Transmit Mixer

19-1350 Rev 2; 2/99
UAL
IT MAN
TION K
A
SHEET
EVALU
S DATA
W
FOLLO
900MHz Image-Reject Receivers
with Transmit Mixer
____________________________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
Optimized for Common Receiver IF Frequencies:
10.7MHz (MAX2424)
70MHz (MAX2426)
o
PA Predriver Provides up to 0dBm
o
Low Current Consumption: 23mA Receive
20mA Transmit
9.5mA Oscillator
o
0.5µA Shutdown Mode
o
Operates from Single +2.7V to +4.8V Supply
________________General Description
The MAX2424/MAX2426 highly integrated front-end ICs
provide the lowest cost solution for cordless and ISM-
band radios operating in the 900MHz band. Both devices
incorporate a receive image-reject mixer (to reduce filter
cost) as well as a versatile transmit mixer. The devices
operate from a +2.7V to +4.8V single power supply,
allowing direct connection to a 3-cell battery stack.
The receive 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 (IIP3) of up to +2dBm.
The transmitter consists of a double-balanced mixer and
a power amplifier (PA) predriver that produces up to
0dBm (in some applications serving as the final power
stage). It can be used in a variety of configurations,
including BPSK modulation, direct VCO modulation, and
transmitter upconversion. For devices featuring trans-
mit as well as receive image rejection, refer to the
MAX2420/MAX2421/MAX2422/MAX2460/MAX2463
data sheet.
The MAX2424/MAX2426 have an on-chip local oscillator
(LO), requiring only an external varactor-tuned LC tank
for operation. The integrated divide-by-64/65 dual-mod-
ulus prescaler can also be set to a direct mode, in which
it acts as an LO buffer amplifier. Four separate power-
down inputs can be used for system power manage-
ment, including a 0.5µA shutdown mode.
The MAX2424/MAX2426 come in a 28-pin SSOP pack-
age.
MAX2424/MAX2426
_______________Ordering Information
PART
MAX2424EAI
MAX2426EAI
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 SSOP
28 SSOP
___________________Pin Configuration
TOP VIEW
V
CC
1
CAP1 2
RXOUT 3
GND 4
RXIN 5
28 GND
27 GND
26 GND
25 TANK
________________________Applications
Cordless Phones
Wireless Telemetry
Wireless Networks
Spread-Spectrum Communications
Two-Way Paging
V
CC
6
GND 7
GND 8
TXOUT 9
LNAGAIN 10
V
CC
11
TXIN 12
TXIN 13
MAX2424
MAX2426
24 TANK
23 V
CC
22 V
CC
21 PREOUT
20 PREGND
19 MOD
18 DIV1
17 VCOON
16 RXON
15 TXON
Functional Diagram appears at end of data sheet.
CAP2 14
SSOP
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.

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