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参数资料
| 型号： | MC33493MOD868EV |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 19/22页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL MC33493 TANGO |
| 标准包装： | 1 |
| 类型： | 发射器，UHF |
| 频率： | 868MHz |
| 已供物品： | 板 |
Recommendations for FSK Modulation
Device pad capacitance is defined by the package capacitance and by the internal circuitry. Typical capacitance values for these
pads are given in Table 11 .
Some realistic assumptions and measurements have been made concerning track parasitic capacitances for a 0.8 mm FR4
double side application PCB. They are given in Table 11 and the corresponding PCB layout is shown in figure Figure 17 .
To achieve large deviations, this total load capacitance must be lowered. For a given crystal, the PCB must be carefully laid out
to reduce the capacitance of the tracks wired to XTAL0, XTAL1, and CFSK pins.
Recommendation : a R_off resistor can be added in parallel with the FSK switch to optimize the transient response of
demodulated signal. Table 11 gives the optimized R_off values for two deviations. There is no footprint for R_off resistor on
the layout in Figure 16 . When used, this component can be soldered on top of C3.
Figure 16. Crystal Load Capacitance Contributors Schematic
Table 11. Pads and Tracks Parasitic Values
Capacitance
C_pad_XTAL0
C_pad_XTAL1
C_pad_CFSK
C_track_XTAL0
C_track_XTAL1
C_track_CFSK
Value
1
1
1
1.5
1.5
1.5
Unit
pF
pF
pF
pF
pF
pF
PLL Tuned UHF Transmitter for Data Transfer Applications, Rev. 1.7
Freescale Semiconductor
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC3350-041-91 | 制造商:SPC Multicomp 功能描述:ROCKER SWITCH DPDT CTR OFF 制造商:SPC Multicomp 功能描述:ROCKER SWITCH, DPDT, CTR OFF 制造商:SPC Multicomp 功能描述:SWITCH, ROCKER, DPDT, 15A, 250V, BLACK; Contact Configuration:DPDT; Switch Operation:On-Off-On; Contact Current Max:10A; Contact Voltage AC Nom:250V; Contact Voltage DC Nom:250V; Switch Mounting:Panel; Actuator / Cap Color:Black ;RoHS Compliant: Yes |
| MC3350-041-91 | 制造商:SPC Multicomp 功能描述:SWITCH ROCKER DPDT CTR OFF |
| MC33501SNT1 | 功能描述:运算放大器 - 运放 1-7V Single Rail to RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MC33501SNT1G | 功能描述:运算放大器 - 运放 1-7V Single Rail to Rail -40 to 105 Cel RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MC33501SNT1G | 制造商:ON Semiconductor 功能描述:OP AMP SINGLE R/R SMD SOT23-5 |
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