19-1234; Rev 5; 8/03
KIT
ATION
EVALU
E
L
B
A
AVAIL
900MHz Image-Reject Transceivers
Features
♦ Receive/Transmit Mixers with 35dB Image Rejection
________________________Applications
Cordless Phones
Spread-Spectrum Communications
Wireless Telemetry
♦ Adjustable-Gain LNA
♦ Up to +2dBm Combined Receiver Input IP3
♦ 4dB Combined Receiver Noise Figure
♦ >35dB of Transmit Power Control Range
♦ PA Predriver Provides up to +2dBm
♦ Low Current Consumption: 23mA Receive
26mA Transmit
9.5mA Oscillator
♦ 0.5µA Shutdown Mode
♦ Operates from Single +2.7V to +4.8V Supply
_______________Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX2420EAI
-40°C to +85°C
28 SSOP
MAX2421EAI
MAX2422EAI
MAX2460EAI
MAX2463EAI
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
28 SSOP
28 SSOP
28 SSOP
28 SSOP
Functional Diagram appears on last page.
___________________Pin Configuration
TOP VIEW
VCC 1
28 GND
CAP1 2
27 GND
RXOUT 3
26 GND
TXGAIN 4
25 TANK
RXIN 5
Two-Way Paging
VCC 6
Wireless Networks
GND 7
______________________Selector Guide
GND 8
MAX2420
MAX2421
MAX2422
MAX2460
MAX2463
24 TANK
23 VCC
22 VCC
21 PREOUT
20 PREGND
TXOUT 9
PART
IF FREQ
(MHz)
INJECTION
TYPE
LO FREQ
(MHz)
LNAGAIN 10
19 MOD
MAX2420
10.7
High side
fRF + 10.7
VCC 11
18 DIV1
TXIN 12
17 VCOON
MAX2421
46
High side
fRF + 46
MAX2422
70
High side
fRF + 70
N.C. 13
16 RXON
CAP2 14
15 TXON
MAX2460
10.7
Low side
fRF - 10.7
MAX2463
110
Low side
fRF - 110
SSOP
________________________________________________________________ Maxim Integrated Products
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.
1
MAX2420/MAX2421/MAX2422/MAX2460/MAX2463
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 poweramplifier (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 powerdown inputs can be used for system power management, including a 0.5µA shutdown mode. These parts
are compatible with commonly used modulation
schemes such as FSK, BPSK, and QPSK, as well as frequency hopping and direct sequence spread-spectrum
systems. All devices come in a 28-pin SSOP package.
For applications using direct VCO or BPSK transmit modulation, as well as receive image rejection, consult the
MAX2424/MAX2426 data sheet. For receive-only devices,
refer to the MAX2440/MAX2441/MAX2442 data sheet.
MAX2420/MAX2421/MAX2422/MAX2460/MAX2463
900MHz Image-Reject Transceivers
ABSOLUTE MAXIMUM RATINGS
VCC to GND ...........................................................-0.3V to +5.5V
TXIN Input Power (330Ω system) ......................................-8dBm
Voltage on TXOUT......................................-0.3V to (VCC + 1.0V)
Voltage on TXGAIN, LNAGAIN, TXON,
RXON, VCOON, DIV1, MOD ....................-0.3V to (VCC + 0.3V)
RXIN Input Power..............................................................10dBm
TANK, TANK Input Power ...................................................2dBm
Continuous Power Dissipation (TA = +70°C)
SSOP (derate 9.50mW/°C above +70°C) ......................762mW
Operating Temperature Range
MAX242_EAI/MAX246_EAI ................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
CAUTION! ESD SENSITIVE DEVICE
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +4.8V, no RF signals applied, LNAGAIN = TXGAIN = open, VCOON = 2.4V, RXON = TXON = MOD = DIV1 = 0.45V,
PREGND = GND, TA = TMIN to TMAX. Typical values are at TA = +25°C, VCC = +3.3V, unless otherwise noted.) (Note 1)
CONDITIONS
PARAMETER
Supply-Voltage Range
Oscillator Supply Current
MIN
TYP
2.7
PREGND = floating
Prescaler Supply Current
(divide-by-64/65 mode) (Note 2)
MAX
UNITS
4.8
V
9.5
14
mA
4.2
6
mA
Prescaler Supply Current
(buffer mode) (Note 3)
DIV1 = 2.4V
5.4
8.5
mA
Receive Supply Current (Note 4)
RXON = 2.4V, PREGND = floating
23
36
mA
Transmitter Supply Current (Note 5)
RXON = 0.45V, TXON = 2.4V, PREGND = floating
26
42
mA
TA = +25°C
Shutdown Supply Current
VCOON = RXON = TXON =
MOD = DIV1 = GND
Digital Input Voltage High
RXON, TXON, DIV1, VCOON, MOD
Digital Input Voltage Low
RXON, TXON, DIV1, VCOON, MOD
Digital Input Current
Voltage on any one digital input = VCC or GND
0.5
TA = TMIN to TMAX
10
2.4
µA
µA
V
±1
0.45
V
±10
µA
≥25°C guaranteed by production test,
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