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| 型号： | MAX2741 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Integrated L1-Band GPS Receiver |
| 中文描述： | 集成L1波段GPS接收机 |
| 文件页数： | 9/12页 |
| 文件大小： | 239K |
| 代理商： | MAX2741 |
M
Integrated L1-Band GPS Receiver
_______________________________________________________________________________________
9
Applications Information
Fundamentally, the only application areas that require
careful consideration are the LNA input match and the
1st IF filter. Of course, proper supply bypassing,
grounding, and layout is required for reliable perfor-
mance from any RF circuit.
LNA Input Matching
Input matching is critical for optimum noise figure and
system sensitivity. Optimum source impedance (as seen
from the LNA input) for lowest noise figure is 29
+ j47
.
Remember that optimum noise match and optimum gain
match (return loss) do not occur simultaneously, so a
good application circuit will sacrifice gain slightly in favor
of reduced noise figure. Gain and noise circles are pro-
vided in Figure 3; S11 tabular data is provided in Table 8.
1st IF Interface and Filtering
The typical application uses a 37.38MHz 1st IF, and
employs an IF filter. The order of the filter should be tai-
lored to suit the application—stand-alone GPS
receivers will not require the channel-selection and
stopband attenuation of GPS receivers that are inte-
grated into other wireless handsets. Be sure that the fil-
ter topology provides DC-blocking for the IF I/O ports.
Table 7. Detailed Register Definition for Read Address 0111: STATUS
DATA BIT
D15–D10
DEFAULT
XXXXXX
DESCRIPTION
Reserved
D9
X
Out-of-Lock (High Frequency): 1 = PLL is out of lock, VCO free-running at its highest frequency,
0 = Locked.
D8
X
Out-of-Lock (Low Frequency): 1 = PLL is out of lock, VCO free-running at its lowest frequency,
0 = Locked high.
D7
D6
D5
D4
1
X
X
X
XTAL Clock Selected: 1 = Synthesized 16.8MHz reference, 0 = External clock.
Parity: 1 = Even, 0 = Odd.
Reserved
LPF Autotune End: 0 = Autotune run ended; 1 = Calibrating or manual tuning.
LPF Autotune: 0000 ~ 7.7MHz; 1111 = 2.9MHz.
D3–D0
XXXX
Table 8. MAX2741 S11
G = Gmax - 1dB
NF = NFmin + 0.2dB
Figure 3. Gain and Noise Circles for MAX2741 LNA Input
FREQ (MHz)
1100
1200
1300
1400
1500
1550
1560
1570
1575
1580
1590
1600
1650
1700
1800
1900
2000
S11 (MAG)
0.874
0.867
0.859
0.842
0.821
0.809
0.806
0.804
0.803
0.801
0.799
0.796
0.783
0.768
0.739
0.708
0.677
S11 (°)
-50.9
-56.1
-61.5
-66.9
-72.3
-74.9
-75.4
-75.9
-76.2
-76.4
-77.0
-77.5
-80.0
-82.5
-87.4
-92.3
-96.8
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相关代理商/技术参数 |
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| MAX2741AETI+ | 功能描述:射频接收器 Integrated L1-Band GPS Receiver RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| MAX2741AETI+T | 功能描述:射频接收器 Integrated L1-Band GPS Receiver RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| MAX2741AEVKIT | 功能描述:GPS开发工具 MAX2741A Eval Kit RoHS:否 制造商:STMicroelectronics 产品:Evaluation Boards 工具用于评估:IT600, STM32F20x 频率:1.575 GHz 工作电源电压:1.8 V 接口类型:Wireless |
| MAX2741ETI | 功能描述:射频接收器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| MAX2741ETI+ | 功能描述:射频接收器 Integrated L1-Band GPS Receiver RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
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