- 您現在的位置：買賣IC網 > PDF目錄97900 > EL2257CN 125 MHz Single Supply, Clamping Op Amps PDF資料下載
參數資料
| 型號： | EL2257CN |
| 元件分類： | 運算放大器 |
| 英文描述： | 125 MHz Single Supply, Clamping Op Amps |
| 中文描述： | 125 MHz的單電源，鉗位運算放大器 |
| 文件頁數： | 9/21頁 |
| 文件大?。?/td> | 1617K |
| 代理商： | EL2257CN |
17
EL2257C/EL2357C
125 MHz Single Supply, Clamping Op Amps
EL
2257C/EL
2357C
Video Sync Pulse Remover Application
All CMOS Analog to Digital Converters (A/Ds) have a
parasitic latch-up problem when subjected to negative
input voltage levels. Since the sync tip contains no use-
ful video information and it is a negative going pulse, we
can chop it off. Figure 7 shows a unity gain connected
amplifier A of an EL2257C. Figure 8 shows the com-
plete input video signal applied at the input, as well as
the output signal with the negative going sync pulse
removed.
Multiplexing with the EL2257C/EL2357C
The ENABLE pins on the EL2257C/EL2357C allow for
multiplexing applications. Figure 9 shows an EL2357C
with all 3 outputs tied together, driving a back termi-
nated 75
video load. Three sinewaves of varying
amplitudes and frequencies are applied to the three
inputs. Logic signals are applied to each of the ENABLE
pins to cycle through turning each of the amplifiers on,
one at a time. Figure 10 shows the resulting output
waveform at VOUT. Switching is complete in about 50
ns. Notice the outputs are tied directly together. Decou-
pling resistors at each output are not necessary. In fact,
adding them approximately doubles the switching time
to 100 ns.
Short Circuit Current Limit
The EL2257C/EL2357C have internal short circuit pro-
tection circuitry that protect it in the event of its output
being shorted to either supply rail. This limit is set to
around 100 mA nominally and reduces with increasing
junction temperature. It is intended to handle temporary
shorts. If an output is shorted indefinitely, the power dis-
sipation could easily increase such that the part will be
destroyed. Maximum reliability is maintained if the out-
put current never exceeds ±90 mA. A heat sink may be
Figure 7.
Figure 8.
Figure 9.
Figure 10.
相關PDF資料 |
PDF描述 |
|---|---|
| EL2257CS | 125 MHz Single Supply, Clamping Op Amps |
| EL2260C | Dual/Quad 130 MHz Current Feedback Amplifiers |
| EL2260CN | Dual/Quad 130 MHz Current Feedback Amplifiers |
| EL2260CS | Dual/Quad 130 MHz Current Feedback Amplifiers |
| EL2260 | 1GHz, 4x1 Multiplexing Amplifier; Temperature Range: -40°C to 85°C; Package: 14-SOIC T&R |
相關代理商/技術參數 |
參數描述 |
|---|---|
| EL2257CN-02 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL2257CS | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:125MHz Single Supply, Clamping Op Amp |
| EL2257CS-02 | 制造商:Intersil Corporation 功能描述: |
| EL2257CS-T13 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:125MHz Single Supply, Clamping Op Amp |
| EL2257CS-T7 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:125MHz Single Supply, Clamping Op Amp |
發(fā)布緊急采購，3分鐘左右您將得到回復。