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參數(shù)資料
| 型號(hào)： | RFHCS362F |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Code Hopping Encoder with UHF ASK/FSK Transmitter |
| 中文描述： | 跳碼編碼器的超高頻ASK / FSK發(fā)射器 |
| 文件頁數(shù)： | 31/60頁 |
| 文件大?。?/td> | 502K |
| 代理商： | RFHCS362F |
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2002 Microchip Technology Inc.
Preliminary
DS41189A-page 31
rfHCS362G/362F
6.3.2
CRYSTAL OSCILLATOR FSK
OPERATION
The rfHCS362F crystal oscillator can be configured for
FSK operation. Figure 6-2 shows an example FSK cir-
cuit. Capacitors C1 and C2 achieve FSK modulation by
pulling the crystal. When DATA
FSK
= 1, FSKOUT is
high-impedance effectively coupling only capacitor C1
to the crystal and the resulting transmit frequency
equals f
MAX
. When DATA
FSK
= 0, FSKOUT is
grounded to V
SSRF
and will parallel capacitor C2 with
C1. The resulting transmit frequency will equal f
MIN
.
Selecting the appropriate values for C1 and C2 sets the
center frequency and frequency deviation. Capacitor
C1 sets f
MAX
and capacitors C1 and C2 in parallel set
f
MIN
. The graph in Figure 6-3 illustrates this relation-
ship. The transmit center frequency f
C
is defined as:
The frequency deviation of the transmit frequency is
defined as:
TABLE 6-3:
TYPICAL TRANSMIT CENTER FREQUENCY AND FREQUENCY DEVIATION
(FSK MODE)
(1)
FIGURE 6-2:
EXAMPLE FSK EXTERNAL
CRYSTAL CIRCUIT
FIGURE 6-3:
LOAD CAPACITANCE
VERSUS CHANGE IN
TRANSMITTED FREQUENCY
Layout considerations - Avoid parallel traces in order
to reduce circuit stray capacitance. Keep traces as
short as possible. Isolate components to prevent cou-
pling. Use ground traces to isolate signals.
2
min
max
f
f
f
c
+
=
2
min
max
f
f
f
=
C2 = 1000 pF
C2 = 100 pF
C2 = 47 pF
C1 (pF)
Freq (MHz) / Dev (kHz)
Freq (MHz) / Dev (kHz)
Freq (MHz) / Dev (kHz)
22
33
39
47
68
100
433.612 / 34
433.604 / 25
433.598 / 20
433.596 / 17
433.593 / 13
433.587 / 8
433.619 / 27
433.610 / 19
433.604 / 14
433.601 / 11.5
433.598 / 9
—
433.625 / 21
433.614 / 14
433.608 / 10
433.604 / 8
433.600 / 5.5
—
Note 1:
Standard Operating Conditions (unless otherwise stated) T
A
= 25°C, RF
EN
= 1, V
DDRF
= 3V,
f
XTAL
= 13.55 MHz
XTAL
rfHCS362F
X1
C1
C2
FSKOUT
Frequency
(MHz)
Fmax
Fmin
C1
C1||C2
DATA
FSK
= 1 DATA
FSK
= 0
Load Capacitance (pF)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RFHCS362F-I/SS | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 Code Hopping Encoder RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| RFHCS362FT-I/SS | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 Code Hopping Encoder RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| RFHCS362G | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Code Hopping Encoder with UHF ASK/FSK Transmitter |
| RFHCS362G/362F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MCP23016 Datasheet |
| RFHCS362G_11 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:KEELOQ? Code Hopping Encoder with UHF ASK/FSK Transmitter |
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