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PDF MAX2904EGI Data sheet ( Hoja de datos )
| Número de pieza | MAX2904EGI | |
| Descripción | 200mW Single-Chip Transmitter ICs for 868MHz/915MHz ISM Bands | |
| Fabricantes | Maxim Integrated | |
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19-2145; Rev 1; 8/03
200mW Single-Chip Transmitter ICs for
868MHz/915MHz ISM Bands
General Description
Features
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.
Applications
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)
Ordering Information
Automatic Meter Reading
Wireless Security Systems/Alarms
Wireless Sensors
Wireless Data Networks
Wireless Building Control
PART
MAX2900EGI
MAX2901EGI
MAX2902EGI
MAX2903EGI
TEMP RANGE
-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*
MAX2904EGI
-40°C to +85°C
28 QFN-EP*
*Exposed pad
Functional Diagrams/Pin Configurations
CPOUT VCC5
28 27
D2 REFOUT VCC4 REFIN OSC
26 25 24 23 22
CPOUT VCC5 DIV63 REFOUT VCC4 REFIN OSC
28 27 26 25 24 23 22
VTUNE 1
GND 2
VREG 3
VCC1 4
RLPF 5
MAX2900
CP ÷4
REG 8-CHANNEL
SYNTHESIZER
21 D0
20 D1
19 N.C.
18 N.C.
17 RF+
VTUNE 1
GND 2
VREG 3
VCC1 4
RLPF 5
MAX2901/
MAX2903
CP
DUAL-
REG CHANNEL
(/62 OR /63)
SYNTHESIZER
21 VCO+
20 VCO-
19 DIVOUT
18 GND
17 RF+
EN 6
REFEN 7
GATE
16 RF-
15 GND
EN 6
REFEN 7
GATE
16 RF-
15 GND
8 9 10 11 12 13 14
MODIN OOKIN VCC2 VASK LD PWRSET VCC3
Functional Diagrams/Pin Configurations are continued at end of data sheet.
8 9 10 11
MODIN OOKIN VCC2 VASK
12 13 14
LD PWRSET VCC3
________________________________________________________________ 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.
1 page  
200mW Single-Chip Transmitter ICs for
868MHz/915MHz ISM Bands
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX290_ EV kits. VCC = +2.7V to +4.5V, RRLPF = 68kΩ, RPWRSET = 22kΩ, fRF = 917.28MHz (MAX2900/MAX2901/MAX2902) or fRF
= 868MHz (MAX2903/MAX2904), VASK = VREG, fREF = 14.56MHz (MAX2900/MAX2901/MAX2902) or fREF = 13.62MHz
(MAX2903/MAX2904), chip rate on MODIN = 1.22Mbps, POUT = +23dBm, TA = -40°C to +85°C. Typical values are at VCC = +4.5V,
TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN -3σ TYP +3σ MAX UNITS
RF Output Power
RF Output Power Flatness
Adjacent Channel Power Ratio
Alternate Channel Power Ratio
OOK Control Range
PWRSET = 22kΩ, VCC = +4.5V,
TA = +25°C
PWRSET = 22kΩ, VCC = +4.5V,
TA = -40°C to +85°C
PWRSET = 22kΩ, VCC = +3.0V, TA = +25°C
fRF = 900MHz to 930MHz
(MAX2900/MAX2901/MAX2902)
fRF = 867MHz to 870MHz
PN sequence at 1.22MHz
PN sequence at 1.22MHz
21 23.5 25
20.5
18 20
0.3
0.1
-17
-26
40 80
25
21
dBm
dB
dBc
dBc
dB
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
Square-wave signal applied on OOK
41
16
1
dB
µs
At 2nd harmonic of RF output frequency
with external matching network
-50
At 3rd harmonic of RF output frequency
with external matching network
-51
Spurious Emissions
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)
-63
< -70
dBc
Out of 867MHz to 870MHz band other than
harmonics with external matching network
(MAX2903/MAX2904)
< -70
Unlocked, Out-of-Band Spurious Any condition when synthesizer unlocked
Output Level
(pin LD low)
< -50
dBm
Noise Level Out of Band
Modulation off, measured at 960MHz, any
gain setting (MAX2900/MAX2901/MAX2902)
Modulation off, measured at 900MHz, any
gain setting (MAX2903/MAX2904)
-126
-126
-120
-120
dBm/Hz
Output VSWR for Guaranteed
Stability
2:1
Maximum Allowable Output VSWR
2:1
Note 1: Devices are production tested at TA = +25°C and +85°C. Min/Max values are guaranteed by design and characterization
over temperature and supply voltage.
_______________________________________________________________________________________ 5
5 Page 
200mW Single-Chip Transmitter ICs for
868MHz/915MHz ISM Bands
used on the EV kit board for +23dBm output power at
4.5V, and 22kΩ is also recommended for +20dBm out-
put power at +3.0V. For +17dBm at 3.0V, 36kΩ is rec-
ommended. The current consumption, efficiency, and
distortion in the amplification chain are affected by the
choice of the resistor RPWRSET, offering a lot of design
flexibility.
TO INTERNAL
CONTROL
CIRCUIT
1.5V
TO VREG
(2.1V)
PIN
VASK
>200kΩ INTERNAL
CIRCUITS
EXTERNAL
RESISTOR
BRIDGE
Figure 2. PIN VASK Equivalent Circuit
The VASK pin is an input to the internal gain control cir-
cuitry. The gain control is greater than 30dB over the
full range of input voltages from 0 to VREG = 2.1V. This
input is used for ASK modulation. At 1V, a typical 15dB
attenuation is obtained from the peak power. When this
input is not used, connect VASK to VREG.
The RLPF input controls the modulation filter center fre-
quency.
The RLPF pin sets the bandwidth of the modulation fil-
ter. The default filter bandwidth, obtained with a 68kΩ
resistor, is for 1.2Mchips/s. The bandwidth is increased
to accommodate 5Mchips/s by decreasing the resistor
value to about 26kΩ. The minimum value for the resistor
is 12kΩ, which generates the maximum filter band-
width. A higher value can be used in FM mode to set
up a slow ramp-up time for the PA.
Data Filter Characteristics
The data filter approximates a 3rd-order Butterworth fil-
ter. The 3dB cut-off frequency is adjusted through the
resistor on pin RLPF, which controls the first two poles
of the filter (the last high-frequency pole is fixed and set
around 10MHz). The filter is adjustable in a range from
approximately 700kHz to 7MHz.
With the nominal setting (3dB cut off at 0.8MHz), the fil-
ter attenuation is 10dB at 3.6MHz. If used with a BPSK
at 1.22MHz, this provides about 30dB of modulation
rolloff at 3.6MHz. Hence, a significant channelization
effect is obtained.
In the wideband setting (3dB cut off at 5MHz), the
attenuation at 30MHz is still 30dB, helping to pass the
FCC spurious emissions at 960MHz.
TO INTERNAL
CONTROL
CIRCUIT
1.2V
PIN RLPF
100Ω
INTERNAL
CIRCUITS
EXTERNAL
RESISTOR
Figure 3. PIN RLPF Equivalent Circuit
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MAX2904EGI.PDF ] | |
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