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参数资料
| 型号： | MAX2900 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | 200mW Single-Chip Transmitter ICs for 868MHz/915MHz ISM Bands |
| 中文描述： | 200mW、单片发送器IC，用于868MHz/915MHz ISM频段 |
| 文件页数： | 11/18页 |
| 文件大小： | 822K |
| 代理商： | MAX2900 |
M
200mW Single-Chip Transmitter ICs for
868MHz/915MHz ISM Bands
______________________________________________________________________________________
11
used on the EV kit board for +23dBm output power at
4.5V, and 22k
is also recommended for +20dBm out-
put power at +3.0V. For +17dBm at 3.0V, 36k
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.
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 68k
resistor, is for 1.2Mchips/s. The bandwidth is increased
to accommodate 5Mchips/s by decreasing the resistor
value to about 26k
. The minimum value for the resistor
is 12k
, 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.
1.2V
100
INTERNAL
CIRCUITS
PIN RLPF
EXTERNAL
RESISTOR
TO INTERNAL
CONTROL
CIRCUIT
1.5V
>200k
INTERNAL
CIRCUITS
EXTERNAL
RESISTOR
BRIDGE
TO INTERNAL
CONTROL
CIRCUIT
PIN
VASK
TO VREG
(2.1V)
Figure 2. PIN VASK Equivalent Circuit
Figure 3. PIN RLPF Equivalent Circuit
相关PDF资料 |
PDF描述 |
|---|---|
| MAX2903EGI | Controllers, Phase angle; Leaded Process Compatible:No RoHS Compliant: Yes |
| MAX2904EGI | 200mW Single-Chip Transmitter ICs for 868MHz/915MHz ISM Bands |
| MAX291_2_5_6 | |
| MAX292 | 8th-Order, Lowpass, Switched-Capacitor Filters |
| MAX295CWE | 8th-Order, Lowpass, Switched-Capacitor Filters |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX2900EGI | 功能描述:射频发射器 RoHS:否 制造商:Micrel 类型:ASK Transmitter 封装 / 箱体:SOT-23-6 工作频率:300 MHz to 450 MHz 封装:Reel |
| MAX2900EGI-BOW | 功能描述:射频发射器 RoHS:否 制造商:Micrel 类型:ASK Transmitter 封装 / 箱体:SOT-23-6 工作频率:300 MHz to 450 MHz 封装:Reel |
| MAX2900EGI-T | 功能描述:射频发射器 RoHS:否 制造商:Micrel 类型:ASK Transmitter 封装 / 箱体:SOT-23-6 工作频率:300 MHz to 450 MHz 封装:Reel |
| MAX2900ETI+ | 功能描述:射频发射器 200mW Sngl-Chip Txr 868/915MHz ISM Bands RoHS:否 制造商:Micrel 类型:ASK Transmitter 封装 / 箱体:SOT-23-6 工作频率:300 MHz to 450 MHz 封装:Reel |
| MAX2900ETI+T | 功能描述:射频发射器 200mW Sngl-Chip Txr 868/915MHz ISM Bands RoHS:否 制造商:Micrel 类型:ASK Transmitter 封装 / 箱体:SOT-23-6 工作频率:300 MHz to 450 MHz 封装:Reel |
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