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参数资料
| 型号： | MAX7033EUI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC RX 315MHZ/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： | 2,500 |
| 频率： | 315MHz，433MHz |
| 灵敏度： | -114dBm |
| 数据传输率 - 最大： | 33 kbps |
| 调制或协议： | ASK |
| 应用： | 汽车 RKE，遥控，无线传感器 |
| 电流 - 接收： | 5.2mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 带卷 (TR) |
315MHz/433MHz ASK Superheterodyne
Receiver with AGC Lock
The off-chip inductive degeneration is achieved by
connecting an inductor from LNASRC to AGND. This
inductor sets the real part of the input impedance at
LNAIN, allowing for a more flexible input impedance
match, such as a typical PCB trace antenna. A nominal
value for this inductor with a 50 Ω input impedance is
15nH, but is affected by PCB trace.
The LC tank filter connected to LNAOUT comprises L3
and C2 (see the Typical Application Circuit). Select L3
and C2 to resonate at the desired RF input frequency.
The resonant frequency is given by:
reduction resistor. The resistor reduces the LNA gain
by 35dB, thereby reducing the RSSI output by about
500mV. The LNA resumes high-gain mode when the
RSSI level drops back below 1.39V (approximately
-70dBm at RF input) for 1ms. The AGC has a hysteresis
of 8dB. With the AGC function, the MAX7033 can reli-
ably produce an ASK output for RF input levels up to
0dBm with modulation depth of 18dB.
When the AC pin is high and SHDN goes high, the
AGC circuit is disabled and the LNA is always in high-
gain mode. The AGC function can be resumed by
f RF =
1
2 π L TOTAL × C TOTAL
bringing the AC pin low when SHDN is high.
The MAX7033 features an AGC lock function that is
asserted when the level at the AC pin transitions from
low to high while SHDN is high. Locking the AGC locks
where:
L TOTAL = L3 + L PARASITICS .
C TOTAL = C2 + C PARASITICS .
L PARASITICS and C PARASITICS include inductance and
capacitance of the PCB traces, package pins, mixer
input impedance, LNA output impedance, etc. These
parasitics at high frequencies cannot be ignored, and
can have a dramatic effect on the tank filter center fre-
quency. Lab experimentation should be done to opti-
mize the center frequency of the tank.
Automatic Gain Control
When the AC pin is low, the automatic gain-control
(AGC) circuit monitors the RSSI output. As the RSSI
output reaches 1.98V, which corresponds to RF input
level of -62dBm, the AGC switches on the LNA gain
V IH
the LNA in the current gain state. As shown in Figure 1,
the AGC lock function can be enabled or disabled as
long as the SHDN pin is high. Changing the state of AC
when SHDN is low has no effect.
Mixer
A unique feature of the MAX7033 is the integrated
image rejection of the mixer. This device eliminates the
need for a costly front-end SAW filter for most applica-
tions. Advantages of not using a SAW filter are
increased sensitivity, simplified antenna matching, less
board space, and lower cost.
The mixer cell is a pair of double balanced mixers that
perform an IQ downconversion of the RF input to the
10.7MHz IF from a low-side injected LO (i.e., f LO = f RF -
f IF ). The image-rejection circuit then combines these
signals to achieve 44dB of image rejection. Low-side
SHDN
V IL
PIN
V IH
AC PIN
V IL
AGC
LOCK
AGC
UNLOCK
AGC
LOCK
AGC
UNLOCK
NO
EFFECT
NO
EFFECT
NO
EFFECT
AGC ENABLED
AGC
DISABLED
AGC
ENABLED
AGC
DISABLED
Figure 1. AGC Lock Activation Cycles
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7033EVKIT-315 | 功能描述:射频开发工具 MAX7033 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 |
| MAX7033EVKIT-433 | 功能描述:射频开发工具 MAX7033 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 |
| MAX7034 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:315MHz/434MHz ASK Superheterodyne Receiver |
| MAX7034_09 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:315MHz/434MHz ASK Superheterodyne Receiver |
| MAX7034_11 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:315MHz/434MHz ASK Superheterodyne Receiver 250μs Startup Time |
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