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參數(shù)資料
| 型號： | MICRF213AYQS |
| 廠商： | MICREL INC |
| 元件分類： | 消費家電 |
| 英文描述： | 1.8 V dual UART, 20 Mbit/s (max.) with 128-byte FIFOs, infrared (IrDA), and XScale VLIO bus interface, SOT912-1 (TFBGA36), Tray Pack, Bakeable, Multiple |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO16 |
| 封裝： | QSOP-16 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 850K |
| 代理商： | MICRF213AYQS |
Micrel, Inc.
MICRF213
Functional Diagram
May 2007
6
M9999-052307-A
(408) 944-0800
ANT
CAGC
RSSI
DO
CTH
SEL
SEL
VDD
Mixer
Mixer
VSS
f
LO
SHDN
SQUELCH
RF
Amp
Synthesizer
Reference and Control
Control Logic
OOK
Demodulator
Control Logic
DO
IMAGE
REJECT
FILTER
–f
f
i
IF
Amp
IF
Amp
Detector
AGC
RSSI
Slicing
Level
Programmable
Low Pass Filter
Control
Logic
Reference
Oscillator
RO1
RO2
Crystal
Figure 1. Simplified Block Diagram
Functional Description
Figure 1. Simplified Block Diagram. It is the basic
structure of the MICRF213. It is made of three sub-
blocks; Image Rejection UHF Down-converter, the OOK
Demodulator, and Reference and Control Logics.
Outside the device, the MICRF213 requires only three
components to operate; two capacitors (CTH, and
CAGC) and the reference frequency device, usually a
quartz crystal. An additional five components may be
used to improve performance. These are: power supply
decoupling capacitor, two components for the matching
network and two components for the pre-selector band
pass filter.
Receiver Operation
LNA
The RF input signal is AC-coupled into the gate circuit of
the grounded source LNA input stage. The LNA is a
Cascoded NMOS.
Mixers and Synthesizer
The LO ports of the Mixers are driven by quadrature
local oscillator outputs from the synthesizer block. The
local oscillator signal from the synthesizer is placed on
the low side of the desired RF signal. This allows
suppression of the image frequency at twice the IF
frequency below the wanted signal. The local oscillator
is set to 32 times the crystal reference frequency via a
phase-locked loop synthesizer with a fully integrated
loop filter.
Image Reject Filter and Band-Pass Filter
The IF ports of the mixer produce quadrature down
converted IF signals. These IF signals are low-pass
filtered. This removes higher frequency products prior to
the image reject filter where they are combined to reject
the image frequencies. The IF signal then passes
through a third order band pass filter. The IF center
frequency is 0.86MHz. The IF BW is 235KHz @
315MHz, this will vary with RF operating frequency. The
IF BW can be calculated via direct scaling:
BW
IF
= BW
IF@315MHz
×
315
(MHz)
Freq
Operating
These filters are fully integrated inside the MICRF213.
After filtering, four active gain controlled amplifier stages
enhance the IF signal to proper level for demodulation.
OOK Demodulator
The demodulator section is comprised of detector,
programmable low pass filter, slicer, and AGC
comparator.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MICRF213AYQS TR | 功能描述:射頻接收器 300MHz to 350MHz, 3.0V to 3.6V, 7.2kbps, 4mA, ASK Receiver with RSSI, Shutdown in 16-Lead QSOP (Lead-Free) RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel |
| MICRF218 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:3.3V, 315/433MHz Wide-IF Bandwidth ASK Receiver |
| MICRF218_11 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:3.3V, 315/433MHz Wide-IF Bandwidth ASK Receiver |
| MICRF218AYQS | 功能描述:射頻接收器 300MHz to 450MHz, 3.0V to 3.6V, <10kbps, 4mA, Wide-IF Bandwidth ASK Receiver with RSSI, Shutdown in 16-Lead QSOP RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel |
| MICRF218AYQS TR | 功能描述:射頻接收器 300MHz to 450MHz, 3.0V to 3.6V, <10kbps, 4mA, Wide-IF Bandwidth ASK Receiver with RSSI, Shutdown in 16-Lead QSOP RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel |
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