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參數(shù)資料
| 型號： | SY10H842ZH TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 7/7頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CLK BUFFER 1:4 160MHZ 16-SOIC |
| 標準包裝： | 1,000 |
| 系列： | Precision Edge® |
| 類型： | 扇出緩沖器（分配） |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 1:4 |
| 差分 - 輸入:輸出： | 是/是 |
| 輸入： | PECL |
| 輸出： | TTL |
| 頻率 - 最大： | 160MHz |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 工作溫度： | 0°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 16-SOIC |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | SY10H842ZHTR SY10H842ZHTR-ND |
Technical Note
BH7824FVM,BH7826FVM
7/14
www.rohm.com
2011.08 - Rev.B
2011 ROHM Co., Ltd. All rights reserved.
Ranges
Rin
10kΩ ≦ R1 ≦120kΩ
Rf
47kΩ ≦ R2 ≦120kΩ
Cf
Gain＞+6dB
Cf≦560pF
0＜Gain≦+6dB
Cf≦270pF
fcL
≧ 4kHz
●Functions and Settings of external components
【Function of external components】
①R1
R1 is an input resistor of inverting amplifier which determines closed loop gain with R2.
②R2
R2 is a feedback resistor of inverting amplifier determine closed loop gain with R2. The gain is set by below
expression.
Gain = 20log
[dB]
③Cf
Cf is feedback capacitor to cut high frequency signals.
It forms a low-pass filter with R2. The cut-off frequency is calculated as below.
fcL =
[Hz]
(注) R1,R2,Cf and fcL has limits in below table. Please set these component values in the ranges.
④Cb1 (Cb2 is only BH7824FVM.)
The capacitors stabilize DC bias voltage.
As Cb1 (or Cb2) becomes larger, power supply rejection ratio is improved but turn on time becomes longer.
As it becomes smaller, turn on time becomes shorter but power supply rejection ratio and cross talk become worse.
⑤Cin
It is Input coupling capacitor.
The value of the input capacitor directly affects the low frequency performance of the circuit.
The corner frequency of the high pass filter is determined in equation at ③ of next section.
【Configuration of external components 】
①
Gain
Gain is designed by output power application ask for.
Output power is determined to below.
Po[W] = Vo
2[Vrms] / RL[]
Vo = Gv·Vin
Gv ≧
RL
Po
·
/ Vin
②
Values of R1 and R2
R1 and R2 are determined to Av.
Av = ( R2 / R1 )×2
Input impedance (R1) must be probable driven by signal source
③
Input coupling capacitor
Corner frequency of HPF is determined in below.
fc[Hz] = 1 / (2
π·R1·Cin)
Input coupling is solved by equation of fc.
Cin ≧ 1 / (2
π·R1·fc)
R2
R1
1
2π×R2×Cf
BH7824FVM
BH7826FVM
Cb1
1F
Cb2
0.1F
―
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