_______________General Description
The MAX2402 transmitter integrates a double-balanced
mixer, buffered local oscillator (LO) port, variable gain
stage, and power amplifier into a single IC. It is intended for use in the 800MHz to 1000MHz band, and is
compatible with both direct-sequence and frequencyhopping spread-spectrum designs in the 902MHz to
928MHz ISM band.
In a typical application, a digital baseband signal is
mixed with a local oscillator signal to yield a BPSKmodulated carrier at the antenna. Alternatively, the
baseband input may be grounded and an FSKmodulated LO signal applied directly to the LO port.
The LO port consists of a limiting amplifier that can
accept a single-ended or differential signal with input
power between -6dBm and +6dBm in the 800MHz to
1000MHz frequency range. The baseband modulation
input is linear over a 2V range, and limits with larger
signal levels within the supply range. The doublebalanced mixer has been optimized for high carrier
rejection. The variable gain stage offers typically 40dB
of adjustment range. The power amplifier provides
more than 20dBm output power and has a bias adjustment, which allows adjustment of efficiency and
harmonic distortion.
A shutdown function reduces the current draw to less
than 2µA in less than 10µs. The MAX2402 comes in a
20-pin SSOP package to minimize board area.
________________________Applications
Direct-Sequence Spread-Spectrum Transmitter
Frequency-Hopping Spread-Spectrum
Transmitter
FSK, GMSK, BPSK, and ASK Digital Transmitter
AM and FM Analog Transmitter
____________________________Features
♦ Low-Cost, Flexible Transmitter
♦ More than 100mW of Output Power into 50Ω
♦ Operates from 800MHz to 1000MHz
♦ Single +5V Supply
♦ 20-Pin SSOP Package
♦ Uses Less than 2µA in Power-Down
♦ More than 35dB of Power Adjustment Range
♦ LO Input Power Range from -6dBm to +6dBm
♦ 2V Linear Range on Modulation Input
MAX2402
800MHz to 1000MHz Transmitter
________________________________________________________________
Maxim Integrated Products
1
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
GND
V
CC
GND
GND
V
CC
GND
MOD
VGC
TOP VIEW
OUT
GND
OUT
GNDGND
LO-
LO+
GND
12
11
9
10
V
CC
LGND
BADJ
SHDN
SSOP
MAX2402
__________________Pin Configuration
MOD
LO+
LO-
MODULATION
BUFFER
LO INPUT
BUFFER
MIXER
VGC
VGC
OUT
BADJ
SHDN
POWER
AMPLIFIER
MASTER BIAS
________________Functional Diagram
19-0392; Rev 1; 5/96
PART
MAX2402EAP* -40°C to +85°C
TEMP. RANGE PIN-PACKAGE
20 SSOP
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
______________Ordering Information
* An alternate marking, MAX2402CAP, has been identically tested.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX2402
800MHz to 1000MHz Transmitter
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC= 4.75V to 5.5V, BADJ = open, SHDN = VCC- 0.5V, VGC = VCC, MOD = open, TA= -40°C to +85°C, unless otherwise noted.)
AC ELECTRICAL CHARACTERISTICS
(MAX2402 evaluation kit, VCC= 5.0V, BADJ = 2V, SHDN = VCC, MOD = 0V, VGC = VCC, R
LOAD
= 35Ω, fLO= 900MHz,
LO power = -3dBm, TA= -40°C to +85°C, unless otherwise noted.)
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: See
Typical Operating Characteristics
graphs.
Note 2: Guaranteed by design.
V
CC
........................................................................-0.3V to +6.5V
Continuous Power Dissipation (T
A
= +70°C)
SSOP (derate 16.7mW/°C above +70°C) ......................1.33W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
SHDN
= 0.5V
Not transmitting
SHDN = V
CC
VGC = V
CC
MOD = V
CC
MOD = 0V
CONDITIONS
µA0.15 2I
CCPD
Shutdown Supply Current
mA105I
CC
Supply Current
VV
CC
- 0.5V
SHDN
HighSHDN High Threshold
V0.5V
SHDN
LowSHDN Low Threshold
µA10.5I
PD
SHDN Bias Current
V4.75 5.50V
CC
Supply Voltage Range
µA115I
VGC
VGC Input Bias Current
µA
325
I
MOD
MOD Bias Current
-320
UNITSMIN TYP MAXSYMBOLPARAMETER
fLO= 900MHz + 901MHz
(Note 1)
(Note 1)
MOD = 5Vp-p @ 100kHz
(Note 2)
(Note 2)
(Note 2)
For max power out (50Ω input term)
(Note 2)
VGC = 0V (Note 1)
(Note 1)
CONDITIONS
dBm28.4IP3Output IP3 (BADJ = 1.0V)
dBC25HS33rd Harmonic Suppression
dBC22HS22nd Harmonic Suppression
dBC30CSCarrier Suppression
V1.0 2.5VGCVGC Control Range
MHz25MODBWMOD Usable Bandwidth
MHz800 1000f
LO
LO Frequency Range
dBm
dB24P
GAIN
Power Gain from LO
dBm-19P
MIN
Minimum Output Power
dBm21P
MAX
Maximum Output Power
UNITSMIN TYP MAXSYMBOLPARAMETER
P
OUT
= 20dBm (including current to load) mA165I
CCAC
Supply Current
-6 6P
LO
LO Input Power Range