MAX2420 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – 900MHz Image-Reject Transceivers

19-1234; Rev 5; 8/03
EVAALVUAAILTAIOBNLEKIT
900MHz Image-Reject Transceivers
General Description
The MAX2420/MAX2421/MAX2422/MAX2460/MAX2463
are highly integrated front-end ICs that provide the lowest
cost solution for cordless phones and ISM-band radios
operating in the 900MHz band. All devices incorporate
transmit and receive image-reject mixers to reduce filter
cost. They operate with a +2.7V to +4.8V power supply,
allowing direct connection to a three-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 (IP3) of up to +2dBm.
The transmitter consists of a variable-gain IF amplifier
with more than 35dB control range, an image-reject
upconverter with 35dB image rejection, and a power-
amplifier (PA) predriver that produces up to +2dBm (in
some applications serving as the final power stage).
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. Four 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.
For applications using direct VCO or BPSK transmit mod-
ulation, as well as receive image rejection, consult the
MAX2424/MAX2426 data sheet. For receive-only devices,
refer to the MAX2440/MAX2441/MAX2442 data sheet.
________________________Applications
Cordless Phones
Wireless Telemetry
Wireless Networks
Spread-Spectrum Communications
Two-Way Paging
______________________Selector Guide
PART
MAX2420
MAX2421
MAX2422
MAX2460
MAX2463
IF FREQ
(MHz)
10.7
46
70
10.7
110
INJECTION
TYPE
High side
High side
High side
Low side
Low side
LO FREQ
(MHz)
f_RF + 10.7
f_RF + 46
f_RF + 70
f_RF - 10.7
f_RF - 110
Features
o Receive/Transmit Mixers with 35dB Image Rejection
o Adjustable-Gain LNA
o Up to +2dBm Combined Receiver Input IP3
o 4dB Combined Receiver Noise Figure
o >35dB of Transmit Power Control Range
o PA Predriver Provides up to +2dBm
o Low Current Consumption: 23mA Receive
26mA Transmit
9.5mA Oscillator
o 0.5µA Shutdown Mode
o Operates from Single +2.7V to +4.8V Supply
_______________Ordering Information
PART
MAX2420EAI
MAX2421EAI
MAX2422EAI
MAX2460EAI
MAX2463EAI
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 SSOP
28 SSOP
28 SSOP
28 SSOP
28 SSOP
Functional Diagram appears on last page.
___________________Pin Configuration
TOP VIEW
V_{CC 1}
CAP1 2
RXOUT 3
TXGAIN 4
RXIN 5
V_{CC 6}
GND 7
GND 8
TXOUT 9
LNAGAIN 10
V_{CC 11}
TXIN 12
N.C. 13
CAP2 14
MAX2420
MAX2421
MAX2422
MAX2460
MAX2463
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 TXON
________________________________________________________________ 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.