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參數(shù)資料
| 型號： | MICRF112 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | QwikRadio㈢ UHF ASK/FSK Transmitter |
| 中文描述： | QwikRadio系列㈢超高頻ASK / FSK發(fā)射器 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 537K |
| 代理商： | MICRF112 |
Micrel, Inc.
MICRF112
March 2007
13
M9999-030107
(408) 944-0800
Crystal Oscillator for FSK Operation
Figure 5 shows reference oscillator circuit con
fi
guration
for FSK operation. To operate the MICRF112 in FSK
mode, one additional capacitor is needed between
XTALOUT pin and XTALMOD pin. Crystal parameters
for FSK operation are the same as ASK operation
except:
When the ESR of crystal is at 20
, C
FSK
+ C
LOAD
not to exceed 70pF.
When the ESR of crystal is at 300
, C
FSK
+
C
LOAD
not to exceed 30pF
Figure 5. Reference Oscillator FSK Operation
PLL ×32
The function of PLL×32 is to provide a stable carrier
frequency for transmission. It is a “divided by 32” phase
locked oscillator.
Power Amplifier
The power amplifier serves two purposes: 1) to buffer
the VCO from external elements and 2) to amplify the
phase locked signal. The power amplifier can produce
+10dBm at 3V (typical).
Enable Control
Enable control gates the ASK data. It only allows
transmission when Lock, Amplitude and Under Voltage
Detect conditions are valid.
Under Voltage Detect
“Under voltage detect” block senses operating voltage.
If the operating voltage falls below 1.6V, “under voltage
detect” block will send a signal to “enable control” block
to disable the PA.
Open Drain Switch
Open drain switch is used for FSK operation. FSK data
is fed into the FSK pin. The FSK pin is connected to the
gate of the open drain switch. The open collector is
connected to the XTALMOD pin. In Figure 4, a capacitor
is shown connected from XTALMOD pin to XTALOUT.
When FSK pin goes high, the capacitor between
XTALMOD and XTALOUT pulls the frequency of
REFOSC low .
相關(guān)PDF資料 |
PDF描述 |
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| MICRF112YMM10 | QwikRadio㈢ UHF ASK/FSK Transmitter |
| MICRF211 | 3V, QwikRadio㈢ 433.92 MHz Receiver |
| MICRF211AYQS | 3V, QwikRadio㈢ 433.92 MHz Receiver |
| MICRF213 | 1.8 V single UART, 20 Mbit/s (max.) with 128-byte FIFOs, infrared (IrDA), and XScale VLIO bus interface, SOT617-1 (HVQFN32), Tray Pack, Bakeable, Multiple |
| MICRF213AYQS | 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MICRF112_11 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:QwikRadio? UHF ASK/FSK Transmitter |
| MICRF112-315 EV | 制造商:Micrel Inc 功能描述:Evaluation board for MICRF112 |
| MICRF112-315-EV | 功能描述:EVAL BOARD FOR MICRF112 315MHZ 制造商:microchip technology 系列:QwikRadio? 零件狀態(tài):有效 類型:發(fā)射器 頻率:315MHz 配套使用產(chǎn)品/相關(guān)產(chǎn)品:MICRF112 所含物品:板 標(biāo)準(zhǔn)包裝:1 |
| MICRF112-433 EV | 功能描述:射頻開發(fā)工具 300 to 450MHz ASK/FSK +10dBm Transmitter Evaluation Board Tuned for 433MHz - Limit 2 per customer; marketing approval required for additional boards RoHS:否 制造商:Taiyo Yuden 產(chǎn)品:Wireless Modules 類型:Wireless Audio 工具用于評估:WYSAAVDX7 頻率: 工作電源電壓:3.4 V to 5.5 V |
| MICRF112-433EV | 制造商:Micrel 功能描述:Evaluation Board for MICRF112-433 |
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