________________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.
________________________Applications
Cordless Phones
Wireless Telemetry
Wireless Networks
Spread-Spectrum Communications
Two-Way Paging
____________________________Features
Receive Mixer with 35dB Image Rejection
Adjustable-Gain LNA
Up to +2dBm Combined Receiver Input IP3
4dB Combined Receiver Noise Figure
Optimized for Common Receiver IF Frequencies:
10.7MHz (MAX2424)
70MHz (MAX2426)
PA Predriver Provides up to 0dBm
Low Current Consumption: 23mA Receive
20mA Transmit
9.5mA Oscillator
0.5µA Shutdown Mode
Operates from Single +2.7V to +4.8V Supply
MAX2424/MAX2426
900MHz Image-Reject Receivers
with Transmit Mixer
________________________________________________________________ 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
TXON
PREOUT
PREGND
MOD
DIV1
VCOON
RXON
CAP2
TXIN
TXIN
LNAGAIN
TXOUT
GND
GND
RXIN
GND
RXOUT
CAP1
SSOP
TOP VIEW
MAX2424
MAX2426
TANK
V
CC
V
CC
V
CC
V
CC
V
CC
___________________Pin Configuration
19-1350 Rev 3; 12/00
PART
MAX2424EAI
-40°C to +85°C
TEMP. RANGE PIN-PACKAGE
28 SSOP
_______________Ordering Information
Functional Diagram appears at end of data sheet.
EVALUATION KIT
AVAILABLE
MAX2426EAI
-40°C to +85°C 28 SSOP
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.
MAX2424/MAX2426
900MHz Image-Reject Receiver
with Transmit Mixer
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +4.8V, no RF signals applied, LNAGAIN = Unconnected, V
TXIN
= V
TXIN
= 2.3V, V
VCOON
= 2.4V, V
RXON
= V
TXON
=
V
MOD
= V
DIV1
= 0.45V, PREGND = GND, T
A
= -40°C to +85°C. Typicals 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.
Note 5: Calculated by measuring the combined transmit and oscillator supply current and subtracting the oscillator supply current.
V
CC
to GND...........................................................-0.3V to +5.5V
TXIN, TXIN Differential Voltage ..............................................+2V
Voltage on TXOUT......................................-0.3V to (V
CC
+ 1.0V)
Voltage on LNAGAIN, TXON, RXON, VCOON,
DIV1, MOD, TXIN, TXIN............................-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 ...........................-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 (Note 4) 23 36 mA
Prescaler Supply Current
(buffer mode) (Note 3)
5.4 8.5 mA
Oscillator Supply Current
Supply-Voltage Range 2.7 4.8 V
9.5 14 mA
Prescaler Supply Current
(÷ 64/65 mode) (Note 2)
4.2 6 mA
CONDITIONS
V
RXON
= 2.4V, PREGND = unconnected
V
DIV1
= 2.4V
PREGND = unconnected
Digital Input Voltage Low 0.45 V
Shutdown Supply Current
0.5
RXON, TXON, DIV1, VCOON, MOD
VCOON = RXON = TXON
= MOD = DIV1 = GND
Digital Input Current ±1 ±10 µAVoltage on any one digital input = V
CC
or GND
Digital Input Voltage High V2.4RXON, TXON, DIV1, VCOON, MOD
10
µA
T
A
= +25°C
T
A
= -40°C to +85°C
Transmitter Supply Current (Note 5) 20 32 mA
V
RXON
= 0.45V, V
TXON
= 2.4V,
PREGND = unconnected
AC ELECTRICAL CHARACTERISTICS
(MAX2424/MAX2426 EV kit, V
CC
= +3.3V, f
RXIN
= 915MHz, P
RXIN
= -35dBm, V
TXIN
= V
TXIN
= 2.3V (DC bias), V
TXIN
= 250mVp-p,
f
TXIN
= 1MHz, V
LNAGAIN
= 2V, V
VCOON
= 2.4V, RXON = TXON = MOD = DIV1 = PREGND = GND, T
A
= +25°C, unless otherwise noted.)
MAX2424/MAX2426
900MHz Image-Reject Receiver
with Transmit Mixer
_______________________________________________________________________________________ 3
(Note 12)
MAX2424 (Notes 6, 7)
T
A
= T
MIN
to T
MAX
(Note 6)
T
A
= +25°C
(Notes 6, 7)
(Notes 6, 11)
(Note 10)
Receiver on or off
LNAGAIN = GND (Note 8)
V
LNAGAIN
= 1V (Note 8)
V
LNAGAIN
= 1V (Notes 6, 9)
LNAGAIN = V
CC
(Notes 6, 9)
V
LNAGAIN
= V
CC
,
T
A
= -40°C to +85°C (Notes 6, 8)
MAX2426 (Notes 6, 7)
V
LNAGAIN
= V
CC
,
T
A
= +25°C (Note 8)
V
LNAGAIN
= 1V (Notes 6, 8)
LNAGAIN = V
CC
(Notes 6, 8)
CONDITIONS
dBc30Carrier Suppression
dBm3.5Output Third-Order Intercept (OIP3)
dBm-0.5Output 1dB Compression
-10 -4.5
dBm
-9.5 -7 -5
Output Power
MHz125Baseband 3dB Bandwidth
MHz800 1000Output Frequency Range
ns500Receiver Turn-On Time
dBm-60LO to RXIN Leakage
-8
dB
-19 -17
Input Third-Order Intercept
(IIP3)
12
dB
45
Noise Figure
MHz
8.5 10.7 12.5
MHz800 1000Input Frequency Range
-16
12
18 24
19 25
55 70 85
IF Frequency Range
dB26 35Image Frequency Rejection
dB
20 22 24.5
Conversion Power Gain
19 21 23.5
UNITSMIN TYP MAXPARAMETER
MAX2424
MAX2426
MAX2424
MAX2426
V
LNAGAIN
= 1V
LNAGAIN = V
CC
-18
dBm
-26
Input 1dB Compression
(Note 13) ns220Transmitter Turn-On Time
dBm/Hz-140Output Noise Density
RECEIVER (V
RXON
= 2.4V, f
LO
= 925.7MHz (MAX2424), f
LO
= 985MHz (MAX2426))
TRANSMITTER (V
TXON
= 2.4V, f
LO
= 915MHz)

MAX2424EAI+T

Mfr. #:
Manufacturer:
Maxim Integrated
Description:
RF Receiver Integrated Circuits (ICs)
Lifecycle:
New from this manufacturer.
Delivery:
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