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| 型号： | MAX7034AUI/V+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC RCVR 315/433MHZ ASK 28TSSOP |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 频率： | 300MHz ~ 450MHz |
| 灵敏度： | -114dBm |
| 数据传输率 - 最大： | 66 kbps |
| 调制或协议： | ASK |
| 应用： | RKE，遥测，安全技术 |
| 电流 - 接收： | 7.2mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 特点： | 配有 RSSI |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 管件 |
315MHz/434MHz ASK Superheterodyne
Receiver
It is possible to use an external reference oscillator in
place of a crystal to drive the VCO. AC-couple the exter-
nal oscillator to XTAL2 with a 1000pF capacitor. Drive
XTAL2 with a signal level of approximately 500mV P-P .
AC-couple XTAL1 to ground with a 1000pF capacitor.
Data Filter
The data filter is implemented as a 2nd-order lowpass
Sallen-Key filter. The pole locations are set by the com-
bination of two on-chip resistors and two external
capacitors. Adjusting the value of the external capaci-
tors changes the corner frequency to optimize for differ-
ent data rates. The corner frequency should be set to
approximately 1.5 times the fastest expected data rate
from the transmitter. Keeping the corner frequency near
the data rate rejects any noise at higher frequencies,
resulting in an increase in receiver sensitivity.
The configuration shown in Figure 1 can create a
Butterworth or Bessel response. The Butterworth filter
offers a very flat amplitude response in the passband
and a rolloff rate of 40dB/decade for the two-pole filter.
The Bessel filter has a linear phase response, which
works well for filtering digital data. To calculate the
value of C7 and C6, use the following equations, along
with the coefficients in Table 1:
a threshold voltage. One input is supplied by the data
filter output. Both comparator inputs are accessible off-
chip to allow for different methods of generating the
slicing threshold, which is applied to the second com-
parator input.
The suggested data slicer configuration uses a resistor
(R1) connected between DSN and DSP with a capaci-
tor (C8) from DSN to DGND (Figure 2). This configura-
tion averages the analog output of the filter and sets the
threshold to approximately 50% of that amplitude. With
this configuration, the threshold automatically adjusts
as the analog signal varies, minimizing the possibility
for errors in the digital data. The values of R1 and C8
affect how fast the threshold tracks to the analog ampli-
tude. Be sure to keep the corner frequency of the RC
circuit much lower than the lowest expected data rate.
Note that a long string of zeros or ones can cause the
threshold to drift. This configuration works best if a cod-
ing scheme, such as Manchester coding, which has an
equal number of zeros and ones, is used.
To prevent continuous toggling of DATAOUT in the
absence of an RF signal due to noise, add hysteresis to
the data slicer as shown in Figure 3.
C 7 =
b
a ( 100 k )( π ) ( f C )
Table 1. Coefficents to Calculate C7 and C6
FILTER TYPE a b
C 6 =
a
4 ( 100 k )( π ) ( f C )
Butterworth (Q = 0.707)
Bessel (Q = 0.577)
1.414
1.3617
1.000
0.618
where f C is the desired 3dB corner frequency.
For example, to choose a Butterworth filter response
with a corner frequency of 5kHz:
MAX7034
C 7 =
1 . 000
( 1 . 414 )( 100 k Ω )( 3 . 14 )( 5 kHz )
≈ 450 pF
RSSI
C 6 =
1 . 414
( 4 )( 100 k Ω )( 3 . 14 )( 5 kHz )
≈ 225 pF
R DF2
100k Ω
R DF1
100k Ω
Choosing standard capacitor values changes C7 to
470pF and C6 to 220pF, as shown in the Typical
Application Circuit.
19
DFO
C6
21
OPP
C7
22
DFFB
Data Slicer
The data slicer takes the analog output of the data filter
and converts it to a digital signal. This is achieved by
using a comparator and comparing the analog input to
10
Figure 1. Sallen-Key Lowpass Data Filter
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7034AUIVT | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:315MHz/434MHz ASK Superheterodyne Receiver 250μs Startup Time |
| MAX7034EVKIT-315+ | 功能描述:射频开发工具 MAX7034 Eval Kit RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| MAX7034EVKIT-433+ | 功能描述:射频开发工具 MAX7034 Eval Kit RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| MAX7036 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:300MHz to 450MHz ASK Receiver with Internal IF Filter |
| MAX7036_10 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:300MHz to 450MHz ASK Receiver with Internal IF Filter |
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