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參數(shù)資料
| 型號： | MICRF008BM |
| 廠商： | MICREL INC |
| 元件分類： | 消費家電 |
| 英文描述： | QwikRadio⑩ Sweep-Mode Receiver |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大小： | 115K |
| 代理商： | MICRF008BM |
MICRF008
Micrel
MICRF008
4
July 2003
Note 6.
Sensitivity, a commonly specified receiver parameter, provides an indication of the receiver
’
s input referred noise, generally input thermal
noise. However, it is possible for a more sensitive receiver to exhibit range performance no better than that of a less sensitive receiver if the
background noise is appreciably higher than the thermal noise. Background noise refers to other interfering signals, such as FM radio
stations, pagers, etc.
A better indicator of achievable receiver range performance is usually given by its selectivity, often stated as intermediate frequency (IF) or
radio frequency (RF) bandwidth, depending on receiver topology. Selectivity is a measure of the rejection by the receiver of ambient noise.
More selective receivers will almost invariably provide better range. Only when the receiver selectivity is so high that most of the noise on the
receiver input is actually thermal will the receiver demonstrate sensitivity-limited performance.
Parameter scales linearly proportional with reference oscillator frequency f
T
. For any reference oscillator frequency other than 3.36 MHz,
compute new parameter value as the ratio:
)
Note 7.
f
MHz
3 36MHz
Spurious reverse isolation represents the spurious components which appear on the RF input pin (ANT) measured into 50
with an input RF
matching network.
Series resistance of the resonator (ceramic or crystal) should be minimized to the extent possible, to ensure oscillation. In case where the
resonator series resistance is too great, the oscillator may oscillate at a diminished peak-to-peak level, or may fail to oscillate entirely. Micrel
recommends that series resistances for ceramic resonators and crystals not exceed 50
and 100
respectively.
Note 10.
Parameter scales inversely proportional with reference oscillator frequency f
T
. For any reference oscillator frequency other than 3.36 MHz,
compute new parameter value as the ratio:
)
parameter value at 3.36MHz
REFOSC
×
(
Note 8.
Note 9.
3 36MHz
F
MHz
parameter value at 3.36MHz
REFOSC
×
(
C
TH
source impedance in Table 1 is represented by (sym-
bolic) resistor RSC in the MICRF008 Simplified Block Dia-
gram. The Programmable LPF (Low Pass Filter) is also
illustrated in the MICRF008 Simplified Block Diagram.
SEL0
Programmable LPF
Bandwidth (Hz)
C
TH
Source
Impedance (
)
0
2400
440k
1
4800
220k
Table 1. Nominal Characteristics
Programmable LPF Bandwidth and C
TH
Source
Impedance
Typical Characteristics
4
250
6
8
10
12
14
16
18
300
FREQUENCY (MHz)
350
400
450
500
C
Supply Current
vs. Frequency
T
A
= 25
°
C
V
DD
= 5V
0
-40 -20
2
4
6
8
10
12
14
16
18
0
20
40
60
80 100
C
TEMPERATURE (
°
C)
Supply Current
vs. Temperature
f = 315MHz
V
DD
= 5V
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| MICRF008YM TR | 功能描述:射頻接收器 300-440MHz Low-Cost Receiver, Sweep-Mode( 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 |
| MICRF009 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:QwikRadio Low-Power UHF Receiver |
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