19-2145; Rev 1; 8/03
200mW Single-Chip Transmitter ICs for
868MHz/915MHz ISM Bands
General Description
The MAX2900–MAX2904 complete single-chip 200mW
transmitters are designed for use in the 868MHz/
915MHz frequency bands. The MAX2900/MAX2901/
MAX2902 are compliant with the FCC CFR47 part 15.247
902MHz to 928MHz ISM-band specifications. MAX2903/
MAX2904 are compliant with the ETSI EN330-220 speci-
fication for the European 868MHz ISM band.
These transmitter ICs offer a high level of integration
while minimizing the number of external components.
This is achieved by full integration of the transmit modu-
lator, power amplifier, RF VCO, 8-channel frequency syn-
thesizer, and baseband PN sequence lowpass filter. By
filtering the BPSK modulation, the spurious emissions are
reduced, enabling up to eight independent transmit
channels in the U.S. ISM band. Inputs are provided for
spread-spectrum BPSK, ASK, and OOK. FM can be
achieved by directly modulating the VCO. The devices
are intended primarily for use with an external differential
antenna.
Features
o
Versions for U.S. 902MHz to 928MHz Band and
European 868MHz Band
o
-7dBm to +23dBm Adjustable Differential RF
Output Power
o
+23dBm Output Power at 4.5V, +20dBm Output
Power at 3.0V
o
Support BPSK, OOK, ASK, and FM Modulations
o
Modulation Filter for Direct Sequence BPSK up to
8Mchips/s
o
Fully Integrated VCO with On-Chip Tank
o
Extremely Low Frequency Pulling for OOK
Modulation (typ 60kHz peak, 5kHz RMS)
o
Integrated Frequency Synthesizer for up to
8 Channels (MAX2900)
o
+2.7V to +4.5V Supply Operation
o
Small 28-Pin QFN Package with Exposed Pad
(5mm
✕
5mm)
MAX2900–MAX2904
Applications
Automatic Meter Reading
Wireless Security Systems/Alarms
Wireless Sensors
Wireless Data Networks
Wireless Building Control
PART
MAX2900EGI
MAX2901EGI
MAX2902EGI
MAX2903EGI
MAX2904EGI
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QFN-EP*
28 QFN-EP*
28 QFN-EP*
28 QFN-EP*
28 QFN-EP*
*Exposed
pad
Functional Diagrams/Pin Configurations
CPOUT
28
VTUNE
GND
VREG
VCC1
RLPF
VCC5
27
D2
26
REFOUT VCC4
25
24
REFIN
23
OSC
22
21 D0
VTUNE
GND
VREG
VCC1
RLPF
1
2
CPOUT
28
VCC5
27
DIV63 REFOUT VCC4
26
25
24
REFIN
23
OSC
22
21 VCO+
20 VCO-
1
MAX2900
2
CP
3
4
5
6
7
8
GATE
REG
8-CHANNEL
SYNTHESIZER
÷4
19 N.C.
18 N.C.
17 RF+
16 RF-
15 GND
10
11
12
13
14
3
4
5
6
7
8
REG
20 D1
CP
MAX2901/
MAX2903
19 DIVOUT
DUAL-
CHANNEL
(/62 OR /63)
SYNTHESIZER
18 GND
17 RF+
16 RF-
GATE
15 GND
10
11
12
13
14
EN
REFEN
EN
REFEN
9
9
MODIN OOKIN
VCC2
VASK
LD
PWRSET VCC3
MODIN OOKIN
VCC2
VASK
LD
PWRSET VCC3
Functional Diagrams/Pin Configurations are continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.
200mW Single-Chip Transmitter ICs for
868MHz/915MHz ISM Bands
MAX2900–MAX2904
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ...........................................................-0.3V to +5.0V
Analog/Digital Input Voltage to GND..........-0.3V to (V
CC
+ 0.3V)
Analog/Digital Input Current ..............................................±10µA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin QFN-EP (derate 28.5mW/°C above +70°C)............2W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-65°C to +150°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
Part Selection Information
Five different versions are available. The versions differ
by their frequency band of operation, and by the synthe-
sizer’s mode of operation. The MAX2900 has an internal
8-channel synthesizer.
The MAX2901 and MAX2903 are dual-channel versions
with a selectable internal synthesizer division ratio of 62
or 63. The MAX2901 operates in the 902MHz to
928MHz ISM band and the MAX2903 operates in the
867MHz to 870MHz European ISM band.
PART
MAX2900EGI
MAX2901EGI
MAX2902EGI
MAX2903EGI
MAX2904EGI
FREQUENCY RANGE (MHz)
902 to 928
902 to 928
902 to 928
867 to 870
867 to 870
The MAX2902 and MAX2904 require an off-chip fre-
quency synthesizer. The MAX2902 operates in the
902MHz– 928MHz ISM band and MAX2904 operates in
the 867MHz–870MHz European ISM band.
The MAX2901–MAX2904 provide LO outputs to drive a
receiver and/or an external synthesizer.
SYNTHESIZER
Internal 8 selectable channels
Internal 2 selectable channels
Off-chip
Internal 2 selectable channels
Off-chip
LO OUTPUTS
No
Yes
Yes
Yes
Yes
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +4.5V, EN = OOKIN = REFEN = high, T
A
= -40°C to +85°C. Typical values are at V
CC
= +4.5V, T
A
= +25°C, unless
otherwise noted.) (Note 1)
PARAMETER
Supply Voltage
Shutdown mode: EN =
REFEN = low
V
CC
= +4.0V
V
CC
= +4.5V
CONDITIONS
MIN
2.7
-3σ
TYP
4.5
0.7
60
32
+3σ
MAX
4.5
10
200
40
UNITS
V
µA
Synth mode: OOKIN = low
(MAX2900/MAX2901/MAX2903 only)
Supply Current
Transmit mode with output
matching optimized for
+23dBm at +4.5V: PWRSET
loaded with 22kΩ resistor
Transmit mode with output
matching optimized for
+20dBm at +3.0V: PWRSET
loaded with 22kΩ resistor
T
A
= -40°C
to +85°C
150
200
mA
T
A
= -40°C
to +85°C
110
135
2
_______________________________________________________________________________________
200mW Single-Chip Transmitter ICs for
868MHz/915MHz ISM Bands
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.7V to +4.5V, EN = OOKIN = REFEN = high, T
A
= -40°C to +85°C. Typical values are at V
CC
= +4.5V, T
A
= +25°C, unless
otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
Transmit mode with output
matching optimized for
+17dBm at +3.0V: PWRSET
loaded with 36kΩ resistor
Transmit mode with output
matching optimized for
+14dBm at +3.0V: PWRSET
loaded with 51kΩ resistor
MIN
-3σ
TYP
+3σ
MAX
UNITS
MAX2900–MAX2904
T
A
= +25°C
75
Supply Current (continued)
T
A
= +25°C
57
mA
Reference-only mode: EN = low
PA standby mode: OOKIN = low
(MAX2902/MAX2904 only)
VCO Input Tuning Pin Current
VREG VCO Regulator Voltage
DIGITAL INPUT/OUTPUTS
(PINS EN, REFEN, D0, D1, D2, MODIN, OOKIN, LD)
Input Level High
Input Level Low
Input Bias Current
Output Level High
Output Level Low
Output Current
ANALOG CONTROL INPUTS
(PINS PWRSET, RLPF, VASK)
PWRSET Voltage
RLPF Voltage
VASK Input Impedance
100
-100
-10
V
CC
- 0.4
V
CC
- 0.5V
VTUNE = +4.5V, T
A
= +25°C
2
29
0.02
2.0
3
33
2
µA
V
V
0.5
10
V
µA
V
0.4
100
1.2
1.2
220
400
V
µA
V
V
kΩ
_______________________________________________________________________________________
3
200mW Single-Chip Transmitter ICs for
868MHz/915MHz ISM Bands
MAX2900–MAX2904
AC ELECTRICAL CHARACTERISTICS
(MAX290_ EV kits. V
CC
= +2.7V to +4.5V, R
RLPF
= 68kΩ, R
PWRSET
= 22kΩ, f
RF
= 917.28MHz (MAX2900/MAX2901/MAX2902) or f
RF
= 868MHz (MAX2903/MAX2904), VASK = VREG, f
REF
= 14.56MHz (MAX2900/MAX2901/MAX2902) or f
REF
= 13.62MHz
(MAX2903/MAX2904), chip rate on MODIN = 1.22Mbps, P
OUT
= +23dBm, T
A
= -40°C to +85°C. Typical values are at V
CC
= +4.5V,
T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
ANALOG INPUT PINS
VTUNE Input Capacitance
DIGITAL INPUT PINS
Digital Input Pin Capacitance
VCO AND SYNTHESIZERS SECTION
RFOUT Frequency Range
REFIN Reference Frequency
Range
REFDIV Fixed Reference Divider
Ratio
Main Divider Ratios
PLL Comparison Frequency
VCO Buffer Output Power
REFDIV Fixed Reference
Divider Ratio
VCO Phase Noise
VCO Tuning Gain
VCO Frequency Pulling with
OOK Modulation
PLL Phase Noise
REFOUT Voltage Swing
CPOUT Charge Pump Current
Reference Spurs
Reference Input Voltage for
Nominal Operation
MODIN Frequency Range
Modulation Filter Nominal 3dB
Bandwidth
Modulation Filter Final Attenuation Measured at 30MHz
Carrier Suppression
Noise Power Density
At 960MHz (measured at RFOUT at
+23dBm output power)
28
Using an external frequency reference
200
(MAX2900/MAX2901/MAX2902)
(MAX2903/MAX2904)
(MAX2900/MAX2901/MAX2902)
(MAX2903/MAX2904)
(MAX2900)
Table 4 (MAX2900)
(MAX2901/MAX2903)
(MAX2900)
(MAX2901/MAX2903)
300Ω differential load (MAX2901–MAX2904)
(MAX2901/MAX2903)
At 100kHz offset, measured at RFOUT,
PLL loop BW = 5kHz
VTUNE = +1.35V
OOKIN clocked at 19kHz, internal (crystal)
or external reference frequency
Measured at RFOUT, 5kHz offset,
PLL loop BW = 50kHz
100
500
-62
300
44
1
902
867
14
13
4
249
62
3.5
13
-12
1
-101
65
5
60
-96
86
1
dBc/Hz
MHz/V
kHz RMS
kHz peak
dBc/Hz
mVp-p
µA
dBc
mV
3.64
917.28
868
14.56
13.78
4
928
870
15
14.5
4
256
63
3.75
15
MHz
dBm
MHz
MHz
3
pF
VTUNE = +1.35V
15
pF
CONDITIONS
MIN
-3σ
TYP
+3σ
MAX
UNITS
BPSK, OOK MODULATOR, AND PA
1.2
1
41
28
-150
8
Mb/s
MHz
dB
dB
dBc/Hz
4
_______________________________________________________________________________________
200mW Single-Chip Transmitter ICs for
868MHz/915MHz ISM Bands
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX290_ EV kits. V
CC
= +2.7V to +4.5V, R
RLPF
= 68kΩ, R
PWRSET
= 22kΩ, f
RF
= 917.28MHz (MAX2900/MAX2901/MAX2902) or f
RF
= 868MHz (MAX2903/MAX2904), VASK = VREG, f
REF
= 14.56MHz (MAX2900/MAX2901/MAX2902) or f
REF
= 13.62MHz
(MAX2903/MAX2904), chip rate on MODIN = 1.22Mbps, P
OUT
= +23dBm, T
A
= -40°C to +85°C. Typical values are at V
CC
= +4.5V,
T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
PWRSET = 22kΩ, V
CC
= +4.5V,
T
A
= +25°C
RF Output Power
PWRSET = 22kΩ, V
CC
= +4.5V,
T
A
= -40°C to +85°C
PWRSET = 22kΩ, V
CC
= +3.0V, T
A
= +25°C
RF Output Power Flatness
Adjacent Channel Power Ratio
Alternate Channel Power Ratio
OOK Control Range
ASK Output Power Adjustment
Range
RFOUT Rise and Fall Time
ASK output power back-
off relative to max power
OOKIN = high,
VASK = 0
OOKIN = high,
VASK = 1V
f
RF
= 900MHz to 930MHz
(MAX2900/MAX2901/MAX2902)
f
RF
= 867MHz to 870MHz
PN sequence at 1.22MHz
PN sequence at 1.22MHz
40
MIN
-3σ
21
20.5
18
20
0.3
0.1
-17
-26
80
41
dB
16
1
-50
-51
-63
dBc
< -70
µs
dBc
dBc
dB
TYP
23.5
+3σ
25
25
21
dB
dBm
MAX
UNITS
MAX2900–MAX2904
Square-wave signal applied on OOK
At 2nd harmonic of RF output frequency
with external matching network
At 3rd harmonic of RF output frequency
with external matching network
At 4th harmonic of RF output frequency
with external matching network
Out of 902MHz to 928MHz band other than
harmonics with external matching network
(MAX2900/MAX2901/MAX2902)
Out of 867MHz to 870MHz band other than
harmonics with external matching network
(MAX2903/MAX2904)
Spurious Emissions
< -70
Unlocked, Out-of-Band Spurious
Output Level
Any condition when synthesizer unlocked
(pin LD low)
Modulation off, measured at 960MHz, any
gain setting (MAX2900/MAX2901/MAX2902)
< -50
-126
-126
2:1
2:1
-120
dBm
Noise Level Out of Band
Modulation off, measured at 900MHz, any
gain setting (MAX2903/MAX2904)
Output VSWR for Guaranteed
Stability
Maximum Allowable Output VSWR
-120
dBm/Hz
Note 1:
Devices are production tested at T
A
= +25°C and +85°C. Min/Max values are guaranteed by design and characterization
over temperature and supply voltage.
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