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參數(shù)資料
| 型號(hào)： | LT1394CS8 |
| 廠(chǎng)商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 7ns, Low Power, Single Supply, Ground-Sensing Comparator |
| 中文描述： | COMPARATOR, 4000 uV OFFSET-MAX, 7 ns RESPONSE TIME, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-8 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大小： | 213K |
| 代理商： | LT1394CS8 |
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13
LT1394
Fast, High Impedance, Variable Threshold Trigger
A frequent requirement in instrumentation is a fast trigger
with a variable threshold. Often, a high impedance input is
also required. Figure 15 meets these requirements. Com-
parator C1 is the basic trigger, with threshold voltage set at
its negative input. Source follower Q1 provides high
impedance with about 2pF input capacitance and 50pA bias
current. Normally, Q1’s source bias point would be uncer-
tain and drifty, but stabilization techniques eliminate this
concern. A1 measures filtered versions of Q1’s gate and
source voltages. A1’s output biases Q2, forcing Q1’s
channel current to whatever value is required to equalize
A1’s inputs, and hence Q1’s gate and source voltages. A1’s
input filtering and roll-off are far slower than input frequen-
cies of interest; its action does not interfere with the
circuit’s main signal path. The 330pF capacitor prevents
fast edges coupled through Q2’s collector base junction
from influencing A1’s operation.
APPLICATIO
S I
FOR
ATIO
U
W
U
U
Q1 should contribute negligible timing error to minimize
overall delay. Figure 16’s photo verifies Q1’s wideband
operation. Trace B, Q1’s source, lags the input (Trace A) by
only 300ps. Input, FET buffer output and C1 output appear
as Traces A, B and C, respectively in Figure 17. As before,
the FET buffer is seen to contribute small timing error, and
C1’s output is about 8ns delayed from the input.
–
+
C1
LT1394
–
+
A1
LT1097
10M
5V
V
TRIG
±
0.01
μ
F
0.1
μ
F
OUTPUT
1394 F15
10k
Q2
2N3904
INPUT
±
3V
Q1
2N5486
1.5k
–5V
0.1
μ
F
10M
100
330pF
Figure 15. Buffer Provides 2pF, 50pA Input Characteristics for
Fast Trigger. Amplifier-Stabilized Biasing Eliminates FET Offset
200ps/DIV
1394 F16
Figure 16. Trigger Buffer’s 300ps Delay Minimizes
Timing Error. 4GHz Sampling Oscilloscope’s Output Is
a Series of Dots
A = 1V/DIV
B = 1V/DIV
Figure 17. Input (Trace A), FET Source (Trace B)
and Output (Trace C) Waveforms for the Trigger.
Total Delay Is 8ns
10ns/DIV
1394 F17
A = 1V/DIV
B = 1V/DIV
C = 2V/DIV
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PDF描述 |
|---|---|
| LT1394 | 7ns, Low Power, Single Supply, Ground-Sensing Comparator(7ns, 低功耗，單電源，地電平敏感比較器) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1394CS8#PBF | 功能描述:IC COMPARATOR LOW PWR 7NS 8-SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> 線(xiàn)性 - 比較器 系列:UltraFast™ 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:通用 元件數(shù):1 輸出類(lèi)型:CMOS，開(kāi)路集電極，TTL 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V 電壓 - 輸入偏移（最小值）:7mV @ 5V 電流 - 輸入偏壓（最小值）:0.25µA @ 5V 電流 - 輸出（標(biāo)準(zhǔn)）:84mA @ 5V 電流 - 靜態(tài)（最大值）:120µA CMRR, PSRR（標(biāo)準(zhǔn)）:- 傳輸延遲（最大）:600ns 磁滯:- 工作溫度:-40°C ~ 85°C 封裝/外殼:SC-74A，SOT-753 安裝類(lèi)型:表面貼裝 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:1268 (CN2011-ZH PDF) 其它名稱(chēng):*LMV331M5*LMV331M5/NOPBLMV331M5CT |
| LT1394CS8#PBF | 制造商:Linear Technology 功能描述:High Speed Comparator IC |
| LT1394CS8#TR | 功能描述:IC COMPARATOR 7NS LOW PWR 8SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> 線(xiàn)性 - 比較器 系列:UltraFast™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:通用 元件數(shù):1 輸出類(lèi)型:CMOS，推挽式，滿(mǎn)擺幅，TTL 電壓 - 電源，單路/雙路(±):2.5 V ~ 5.5 V，±1.25 V ~ 2.75 V 電壓 - 輸入偏移（最小值）:5mV @ 5.5V 電流 - 輸入偏壓（最小值）:1pA @ 5.5V 電流 - 輸出（標(biāo)準(zhǔn)）:- 電流 - 靜態(tài)（最大值）:24µA CMRR, PSRR（標(biāo)準(zhǔn)）:80dB CMRR，80dB PSRR 傳輸延遲（最大）:450ns 磁滯:±3mV 工作溫度:-40°C ~ 85°C 封裝/外殼:6-WFBGA，CSPBGA 安裝類(lèi)型:表面貼裝 包裝:管件 其它名稱(chēng):Q3554586 |
| LT1394CS8#TRPBF | 功能描述:IC COMPARATOR LOW PWR 7NS 8-SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> 線(xiàn)性 - 比較器 系列:UltraFast™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:通用 元件數(shù):1 輸出類(lèi)型:CMOS，推挽式，滿(mǎn)擺幅，TTL 電壓 - 電源，單路/雙路(±):2.5 V ~ 5.5 V，±1.25 V ~ 2.75 V 電壓 - 輸入偏移（最小值）:5mV @ 5.5V 電流 - 輸入偏壓（最小值）:1pA @ 5.5V 電流 - 輸出（標(biāo)準(zhǔn)）:- 電流 - 靜態(tài)（最大值）:24µA CMRR, PSRR（標(biāo)準(zhǔn)）:80dB CMRR，80dB PSRR 傳輸延遲（最大）:450ns 磁滯:±3mV 工作溫度:-40°C ~ 85°C 封裝/外殼:6-WFBGA，CSPBGA 安裝類(lèi)型:表面貼裝 包裝:管件 其它名稱(chēng):Q3554586 |
| LT1394CS8PBF | 制造商:Linear Technology 功能描述:Ground-Sensing Comparator 7ns SOIC8 |
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