MAX2440EAI+T

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 Spread-Spectrum Communications
Wireless Telemetry Two-Way Paging
Wireless Networks
Features
Receive Mixer with 35dB Image Rejection
Adjustable-Gain LNA
Up to +2dBm Combined Receiver Input IP3
4dB Combined Receiver Noise Figure
Low Current Consumption:
23mA Receive
9.5mA Oscillator
0.5µA Shutdown Mode
Operates from Single +2.7V to +4.8V Supply
MAX2440/MAX2441/MAX2442
900MHz Image-Reject Receivers
________________________________________________________________ Maxim Integrated Products 1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
GND
GND
GND
TANK
GND
PREOUT
PREGND
MOD
DIV1
VCOON
RXON
GND
GND
GND
LNAGAIN
GND
GND
GND
RXIN
GND
RXOUT
CAP1
SSOP
TOP VIEW
MAX2440
MAX2441
MAX2442
TANK
V
CC
V
CC
V
CC
V
CC
V
CC
___________________Pin Configuration
19-1352; Rev 3; 8/03
PART
MAX2440EAI
MAX2441EAI
MAX2442EAI
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE PIN-PACKAGE
28 SSOP
28 SSOP
28 SSOP
_______________Ordering Information
Functional Diagram appears at end of data sheet.
High side
INJECTION
TYPE
f
RF
+ 10.7
LO FREQ
(MHz)
High side
High side
f
RF
+ 70
f
RF
+ 46
MAX2442
MAX2441
70
46
MAX2440
PART
10.7
IF FREQ
(MHz)
______________________Selector Guide
EVALUATION KIT
AVAILABLE
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
900MHz Image-Reject Receivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +4.8V, no RF signals applied, LNAGAIN = unconnected, V
VCOON
= 2.4V, V
RXON
= V
MOD
= V
DIV1
= 0.45V, PREGND
= GND, T
A
= T
MIN
to T
MAX
. Typical values are at T
A
= +25°C, V
CC
= +3.3V, unless otherwise noted.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: 25°C guaranteed by production test, <25°C guaranteed through correlation to worst-case temperature testing.
Note 2: Calculated by measuring the combined oscillator and prescaler supply current and subtracting the oscillator supply current.
Note 3: Calculated by measuring the combined oscillator and LO buffer supply current and subtracting the oscillator supply current.
Note 4: Calculated by measuring the combined receive and oscillator supply current and subtracting the oscillator supply current.
With LNAGAIN = GND, the supply current drops by 4.5mA.
V
CC
to GND...........................................................-0.3V to +5.5V
Voltage on LNAGAIN, RXON, VCOON,
DIV1, MOD .............................................-0.3V to (V
CC
+ 0.3V)
RXIN Input Power..............................................................10dBm
TANK, TANK Input Power ...................................................2dBm
Continuous Power Dissipation (T
A
= +70°C)
SSOP (derate 9.50mW/°C above +70°C) ....................762mW
Operating Temperature Range
MAX244_EAI...................................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
MIN TYP MAX UNITS
Receive Supply Current 23 36 mA
Prescaler Supply Current
(buffer mode)
5.4 8.5 mA
Oscillator Supply Current
Supply-Voltage Range 2.7 4.8 V
9.5 14 mA
Prescaler Supply Current
(divide-by-64/65 mode)
4.2 6 mA
CONDITIONS
V
RXON
= 2.4V, PREGND = unconnected (Note 4)
V
DIV1
= 2.4V (Note 3)
PREGND = unconnected
(Note 2)
Digital Input Voltage Low 0.45 V
0.5
RXON, DIV1, VCOON, MOD
VCOON = RXON = MOD =
DIV1 = GND
Digital Input Current ±1 ±10 µAVoltage on any one digital input = V
CC
or GND
Digital Input Voltage High V2.4RXON, DIV1, VCOON, MOD
Shutdown Supply Current
10
µA
T
A
= +25°C
T
A
= T
MIN
to T
MAX
CAUTION! ESD SENSITIVE DEVICE
AC ELECTRICAL CHARACTERISTICS
(MAX242X/MAX246X EV kit, V
CC
= +3.3V; f
LO
= 925.7MHz (MAX2440), f
LO
= 961MHz (MAX2441), f
LO
= 985MHz (MAX2442),
f
RXIN
= 915MHz; P
RXIN
= -35dBm; V
LNAGAIN
= 2V; V
VCOON
= V
RXON
= 2.4V; RXON = MOD = DIV1 = PREGND = GND; T
A
= +25°C,
unless otherwise noted.)
MAX2440/MAX2441/MAX2442
900MHz Image-Reject Receivers
_______________________________________________________________________________________ 3
CONDITIONS UNITSMIN TYP MAXPARAMETER
MHz800 1000
36 46 55
8.5 10.7 12.5
MHz
20 22 24.5
dB
26 35Image Frequency Rejection
55 70 85
19.5 25
12
19 21 23.5
(Note 7)
-16
(Notes 5, 8) dBm
-8
Input Third-Order Intercept
-19 -17
(Note 9) ns500Receiver Turn-On Time
Receiver on or off dBm-60LO to RXIN Leakage
V
LNAGAIN
= 1V
dBm
-18
Input 1dB Compression
LNAGAIN = V
CC
-26
18 24
LNAGAIN = V
CC
,
T
A
= T
MIN
to T
MAX
(Note 5)
45
dB
12
Noise Figure
dB
IF Frequency Range
(Notes 5, 6)
(Notes 5, 6)
Input Frequency Range
Conversion Power Gain
DIV1 = V
CC
(Notes 5, 7)
MAX2441
MAX2442
LNAGAIN = V
CC
V
LNAGAIN
= 1V
V
LNAGAIN
= 1V
LNAGAIN = V
CC
MAX2442
V
LNAGAIN
= 1V
LNAGAIN = GND
MAX2440
LNAGAIN = V
CC
,
T
A
= +25°C
MAX2440/MAX2441
MAX2440/MAX2441
MAX2442
RECEIVER

MAX2440EAI+T

Mfr. #:
Manufacturer:
Maxim Integrated
Description:
IC RX IMAGE REJECT 28-SSOP
Lifecycle:
New from this manufacturer.
Delivery:
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