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參數(shù)資料
| 型號： | MICRF007BM |
| 廠商： | MICREL INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | QwikRadio Low-Power UHF Receiver |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大小： | 96K |
| 代理商： | MICRF007BM |
December 2000
7
MICRF007
MICRF007
Functional Diagram
Micrel
Functional Description
Refer to
“
MICRF007 Block Diagram
”
. Identified in the block
diagram are the three sections of the IC: UHF Downconverter,
OOK Demodulator and Reference and Control, and Wakeup.
Also shown in the figure are two capacitors (C
TH
, C
AGC
) and
one timing component (Y1), usually a crystal. With the
exception of a supply decoupling capacitor, these are the only
external components needed by the MICRF007 to assemble
a complete UHF receiver. There is one control input, the
SHUT pin. The SHUT function is used to enable the reciever.
These inputs are CMOS compatible, and are pulled-up on the
IC.
Receiver Operation
The MICRF007 is a standard superheterodyne receiver with
a narrow RF bandwidth IF. The narrow bandwidth receiver is
less susceptible to interfering RF signals. The MICRF007 is
capable of data rates up to 2.1kbps. Typically a crystal is
used for the reference oscillator frequency. The MICRF007
RF center frequency is controlled by a completely integrated
PLL / VCO frequency synthesizer which is referenced to the
crystal frequency.
Since the MICRF007 bandwidth is 430kHz, a tight tolerance
transmitter must be used for the system. Typically SAW or
crystal based transmitters are used in application designs.
IF Bandpass Filter
Rolloff response of the IF Filter is 5th order, while the
demodulator data filter exhibits a 2nd order response.
Baseband Demodulator Filter Bandwidth
The MICRF007 has a fully intergrated baseband demodula-
tor filter. The filter has a fixed 2.1kHz bandwidth. This filter
limits the reciever raw data rate to 2kbps.
Peak
Detector
AGC
Control
Pr2nd Order
Ba5th Order
Programmable
Synthesizer
Control
Logic
R
SC
Reference
Oscillator
Cystal
or
Ceramic
Resonator
CAGC
ANT
VDD
VSS
REFOSC
430kHz
Switched-
Capacitor
Resistor
CTH
DO
MICRF002
RF
Amp
IF
Amp
IF
Amp
Compa-
rator
Reference and Control
UHF Downconverter
OOK Demodulator
f
RX
f
LO
f
IF
SHUT
C
AGC
C
TH
f
T
MICRF007 Block Diagram
Data Slicing Level
Extraction of the dc value of the demodulated signal for
purposes of logic-level data slicing is accomplished using the
external threshold capacitor C
TH
and the on-chip switched-
capacitor
“
resistor
”
R
SC
, shown in the block diagram. The
effective resistance of R
SC
is 118k
.
Slicing level time constant values vary somewhat with de-
coder type, data pattern, and data rate, but typically values
range from 5ms to 50ms. Optimization of the value of C
TH
is
required to maximize range.
Automatic Gain Control
The signal path has AGC (automatic gain control) to increase
input dynamic range. An external capacitor, C
AGC
, must be
connected to the CAGC pin of the device. The ratio of decay-
to-attack time-constant is fixed at 10:1 (that is, the attack time
constant is 1/10th of the decay time constant), and this ratio
cannot be changed by the user. However, the attack time
constant is set externally by choosing a value for C
AGC
.
The AGC control voltage is carefully managed on-chip to
allow duty-cycle operation of the MICRF007 in excess of
100:1. When the device is placed into shutdown mode (SHUT
pin pulled high), the AGC capacitor floats, to retain the
voltage. When operation is resumed, only the voltage droop
on the capacitor due to leakage must be replenished, there-
fore a relatively low-leakage capacitor is recommended for
duty-cycled operation. The actual tolerable leakage will be
application dependent. Clearly, leakage performance is less
critical when the device off-time is low (milliseconds) and
more critical when the off-time is high (seconds).
To further enhance duty-cycled operation of the IC, the AGC
push and pull currents are increased for a fixed time immedi-
ately after the device is taken out of shutdown mode (turned-
on). This compensates for AGC capacitor voltage droop
while the IC is in shutdown mode, reduces the time to restore
the correct AGC voltage, and therefore extends maximum
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MICRF007BM TR | 功能描述:IC RECEIVER UHF 300MHZ 8-SOIC RoHS:否 類別:RF/IF 和 RFID >> RF 接收器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 09/Jan/2012 標(biāo)準(zhǔn)包裝:50 系列:* 頻率:850MHz ~ 2.175GHz 靈敏度:- 數(shù)據(jù)傳輸率 - 最大:- 調(diào)制或協(xié)議:- 應(yīng)用:* 電流 - 接收:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 特點(diǎn):- 電源電壓:4.75 V ~ 5.25 V 工作溫度:0°C ~ 85°C 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| MICRF007YM | 功能描述:射頻接收器 300-440MHz Receiver, 1.2kbps, 1.7mA With Shutdown( 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 |
| MICRF007YM TR | 功能描述:射頻接收器 300-440MHz Receiver, 1.2kbps, 1.7mA With Shutdown( 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 |
| MICRF008 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:QwikRadio Sweep-Mode Receiver |
| MICRF008_11 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:QwikRadio Sweep-Mode Receiver |
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