max2442eait Maxim Integrated Products, Inc., max2442eait Datasheet

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max2442eait

Manufacturer Part Number
max2442eait
Description
900mhz Image-reject Receivers
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
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.
Cordless Phones
Wireless Telemetry
Wireless Networks
________________________Applications
19-1352; Rev 3; 8/03
______________________Selector Guide
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.
MAX2440
MAX2441
MAX2442
PART
IF FREQ
(MHz)
10.7
46
70
________________________________________________________________ Maxim Integrated Products
Spread-Spectrum Communications
Two-Way Paging
General Description
INJECTION
High side
High side
High side
TYPE
900MHz Image-Reject Receivers
LO FREQ
f
RF
f
f
RF
RF
(MHz)
+ 10.7
+ 46
+ 70
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:
o 0.5µA Shutdown Mode
o Operates from Single +2.7V to +4.8V Supply
Functional Diagram appears at end of data sheet.
___________________Pin Configuration
_______________Ordering Information
MAX2440EAI
MAX2441EAI
MAX2442EAI
TOP VIEW
23mA Receive
9.5mA Oscillator
PART
LNAGAIN
RXOUT
CAP1
RXIN
GND
GND
GND
GND
GND
GND
V
V
GND
V
CC
CC
CC
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
10
11
12
13
14
TEMP RANGE
1
2
3
4
5
6
7
8
9
MAX2440
MAX2441
MAX2442
SSOP
28
27
26
25
24
23
20
19
18
17
16
15
22
21
28 SSOP
28 SSOP
28 SSOP
PIN-PACKAGE
GND
GND
GND
TANK
TANK
V
V
PREOUT
PREGND
MOD
DIV1
VCOON
RXON
GND
CC
CC
Features
1

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max2442eait Summary of contents

Page 1

Rev 3; 8/03 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. ...

Page 2

Image-Reject Receivers ABSOLUTE MAXIMUM RATINGS V to GND ...........................................................-0.3V to +5.5V CC Voltage on LNAGAIN, RXON, VCOON, DIV1, MOD .............................................-0. RXIN Input Power..............................................................10dBm TANK, TANK Input Power ...................................................2dBm Continuous Power Dissipation (T = +70°C) A SSOP (derate ...

Page 3

AC ELECTRICAL CHARACTERISTICS (MAX242X/MAX246X EV kit +3.3V 915MHz -35dBm; V RXIN RXIN LNAGAIN unless otherwise noted.) PARAMETER RECEIVER Input Frequency Range (Notes Frequency Range (Notes 5, 6) Image Frequency ...

Page 4

Image-Reject Receivers AC ELECTRICAL CHARACTERISTICS (continued) (MAX242X/MAX246X EV kit +3.3V 915MHz -35dBm; V RXIN RXIN LNAGAIN unless otherwise noted.) PARAMETER OSCILLATOR AND PRESCALER Oscillator Frequency Range (Notes 5, 10) Oscillator Phase ...

Page 5

EV kit +3.3V 915MHz -35dBm; V RXIN RXIN LNAGAIN unless otherwise noted.) RECEIVER SUPPLY CURRENT vs. TEMPERATURE 4. 3. ...

Page 6

Image-Reject Receivers (MAX242X/MAX246X EV kit +3.3V 915MHz -35dBm; V RXIN RXIN LNAGAIN unless otherwise noted.) RECEIVER IMAGE REJECTION vs. RF FREQUENCY 60 RXON = ...

Page 7

PIN NAME Supply-Voltage Input for Master Bias Cell. Bypass with a 47pF low-inductance capacitor and 0.1µ GND (pin 28 recommended). Receive Bias Compensation Pin. Bypass with a 47pF low-inductance capacitor and 0.01µF to GND. 2 CAP1 ...

Page 8

Image-Reject Receivers PIN NAME 26 GND Ground Connection for VCO and Phase Shifters 27 GND Ground (substrate) 28 GND Ground Connection for Master Bias Cell V CC 0.1µF 47pF 0.1µF 47pF RECEIVE 8.2nH RF INPUT 47pF 12nH 47pF V ...

Page 9

Detailed Description The following sections describe each of the blocks shown in the Functional Diagram. The MAX2440/MAX2441/MAX2442’s receive path con- sists of a 900MHz low-noise amplifier, an image-reject mixer, and an IF buffer amplifier. The LNA’s gain and biasing are ...

Page 10

Image-Reject Receivers To disable the prescaler entirely, leave PREGND and PREOUT floating. Also tie the MOD and DIV1 pins to GND. Disabling the prescaler does not affect operation of the VCO stage. Power Management MAX2440/MAX2441/MAX2442 supports three different power-management ...

Page 11

V CC MAX2440 C BLOCK 50Ω MAX2441 0.01µF MAX2442 TANK V CC 50Ω EXTERNAL LO LEVEL IS TANK 0dBm FROM A 50Ω SOURCE. Figure 3. Using an External Local Oscillator MAX2440 MAX2441 MAX2442 L T TANK TANK ...

Page 12

Image-Reject Receivers LNAGAIN RXIN CAP1 RXON (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages NOTES: 1. D&E DO ...

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