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参数资料
| 型号： | TRF3761-AIRHATG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 104 MHz, PQCC40 |
| 封装： | GREEN, PLASTIC, MO-220VJJD-2, QFN-40 |
| 文件页数： | 44/60页 |
| 文件大小： | 1736K |
| 代理商： | TRF3761-AIRHATG4 |
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(
)
1
-6
T
=
= 19.2 x 10
2
T + T
1
3
C
v
(22)
(
)
(
)(
)
2
VCO
1
2
1 +
T
K
T
c 2
1
C1 =
×
= 338.75pF
T2
N
1 +
T
1 +
T
c
1
3
é
ù
ê
ú
v
f
ê
ú
ê
ú
v
ê
ú
(23)
T2
C2 = C1
- 1 = 2524.14pF
T1
÷
è
(24)
C1
C3 =
= 33.87pF
10
(25)
T2
R2 =
= 7.61k
C2
(26)
T3
R3 =
= 30.2k
C3
(27)
Layout/PCB Considerations
www.ti.com ............................................................................................................................................... SLWS181J – OCTOBER 2005 – REVISED AUGUST 2008
Then use T1 and T3 to find T2
Now C1, C2, C3, R1, and R2 are calculated using T1, T2, and T3.
Now using C2 and T2, find R2. Use C3 and T3 to find R3
R2 x C3 can be scaled using T3, so if C3 = 330pF, then R2 = 3.03 k
=> 3.4 k in the loop filter. R1 × C2 can
be scaled using T2. Scaling these values helps to improve the lock time. The actual values used in the lock time
plot were optimized for lock time as well as using real valued components. The values in figure 62 were taken
from the current EVM schematic.
This section of the design of the complete PLL is of paramount importance in achieving the desired performance.
Wherever possible, a multi-layer PCB board should be used, with at least one dedicated ground plane. A
dedicated power plane (split between the supplies if necessary) is also recommended. The impedance of all RF
traces (the VCO output and feedback into the PLL) should be controlled to 50
. All small value (10pF and 0.1uF)
decoupling capacitors should be placed as close to the device pins as possible. It is also recommended that both
top and bottom layers of the circuit board be flooded with ground, with plenty of ground vias dispersed as
appropriate. Because the digital lines are not in use during normal operation of the device and are only used to
program the device on start up and during frequency changes the analog grounds (GND) and digital grounds
(DGND) are tied to the same ground plane. The most sensitive part of any PLL is the section between the
charge pump output and the input to the VCO. This includes the loop filter components, and the corresponding
traces. The charge pump is a precision element of the PLL and any extra leakage on its path can adversely
affect performance. Extra care should be given to ensure that parasitics are minimized in the charge pump
output, and that the trace runs are short and optimized. Similarly, it is also recommend that extra care is taken in
ensuring that any flux residue is thoroughly cleaned and moisture baked out of the PCB. From an EMI
perspective, and since the synthesizer is typically a small portion of a bigger, complex circuit board, shielding is
recommended to minimize EMI effects.
Copyright 2005–2008, Texas Instruments Incorporated
49
Product Folder Link(s): TRF3761
相关PDF资料 |
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| TRF3761-EIRHAR | PLL FREQUENCY SYNTHESIZER, 104 MHz, PQCC40 |
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| TRF3761-JIRHATG4 | PLL FREQUENCY SYNTHESIZER, 104 MHz, PQCC40 |
| TRF3761-HIRHAT | PLL FREQUENCY SYNTHESIZER, 104 MHz, PQCC40 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TRF3761-B | 制造商:TI 制造商全称:Texas Instruments 功能描述:INTEGER-N PLL WITH INTEGRATED VCO |
| TRF3761-BIRHAR | 功能描述:时钟合成器/抖动清除器 Low Noise Integer N PLL Freq Synth RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| TRF3761-BIRHARG4 | 功能描述:时钟合成器/抖动清除器 Low Noise Integer N PLL Freq Synth RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| TRF3761-BIRHAT | 功能描述:时钟合成器/抖动清除器 Low Noise Integer N PLL Freq Synth RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| TRF3761-BIRHATG4 | 功能描述:时钟合成器/抖动清除器 Low Noise Integer N PLL Freq Synth RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
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