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參數(shù)資料
| 型號： | LT1714IGN#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 0K |
| 描述： | IC COMP R-RINOUT DUAL 16-SSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | UltraFast™ |
| 類型： | 帶鎖銷 |
| 元件數(shù)： | 2 |
| 輸出類型： | CMOS，補(bǔ)充型，滿擺幅，TTL |
| 電壓 - 電源，單路/雙路(±)： | 2.4 V ~ 12 V，±2.4 V ~ 6 V |
| 電壓 - 輸入偏移（最小值）： | 4mV @ 5V |
| 電流 - 輸入偏壓（最小值）： | 2µA @ 5V |
| 電流 - 輸出（標(biāo)準(zhǔn)）： | 20mA |
| 電流 - 靜態(tài)（最大值）： | 7.5mA |
| CMRR, PSRR（標(biāo)準(zhǔn)）： | 70dB CMRR，80dB PSRR |
| 傳輸延遲（最大）： | 11ns |
| 磁滯： | 100mV |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 安裝類型： | 表面貼裝 |
| 包裝： | 帶卷 (TR) |
13
LT1713/LT1714
Figure 7. LT1713 Comparator is Configured as a Series Resonant Xtal Oscillator.
LT1806 Op Amp is Configured in a Q = 5 Bandpass with fC = 1MHz
3V/DIV
1V/DIV
200ns/DIV
171112 F08
Figure 8. Oscillator Waveforms with VS = 3V. Top is Comparator Output. Middle is
Xtal Feedback to Pin 2 at LT1713 (Note the Glitches). Bottom is Buffered, Inverted
and Bandpass Filtered with a Q = 5 by LT1806
–
+
LT1713
2
3
6
LE
5
1
R1
1k
VS
7
8
SQUARE
171314 F07
SINE
R3
1k
C1
0.1
F
4
R2
1k
R4
210
1
6
2
3
4
7
R8
2k
VS
1MHz
AT-CUT
R9
2k
R7
15.8k
R10
1k
R6
162
R5
6.49k
C5
100pF
C2
0.1
F
C3
100pF
C4
100pF
–
+
LT1806
1MHz Series Resonant Crystal Oscillator
with Square and Sinusoid Outputs
Figure 7 shows a classic 1MHz series resonant crystal
oscillator. At series resonance, the crystal is a low imped-
ance and the positive feedback connection is what brings
about oscillation at the series resonant frequency. The RC
feedback around the other path ensures that the circuit
does not find a stable DC operating point and refuse to
oscillate. The comparator output is a 1MHz square wave
(top trace of Figure 8) with jitter measured at better than
28psRMS on a 5V supply and 40psRMS on a 3V supply. At
Pin 2 of the comparator, on the other side of the crystal, is
a clean sine wave except for the presence of the small high
frequency glitch (middle trace of Figure 8). This glitch is
caused by the fast edge of the comparator output feeding
back through crystal capacitance. Amplitude stability of
the sine wave is maintained by the fact that the sine wave
is basically a filtered version of the square wave. Hence,
the usual amplitude control loops associated with sinusoi-
dal oscillators are not necessary.2 The sine wave is filtered
and buffered by the fast, low noise LT1806 op amp. To
remove the glitch, the LT1806 is configured as a bandpass
filter with a Q of 5 and unity-gain center frequency of
1MHz, with its output shown as the bottom trace of
Figure 8. Distortion was measured at – 70dBc and – 60dBc
on the second and third harmonics, respectively.
2 Amplitude will be a linear function of comparator output swing, which is supply dependent
and therefore adjustable. The important difference here is that any added amplitude
stabilization or control loop will not be faced with the classical task of avoiding regions of
nonoscillation versus clipping.
TYPICAL APPLICATIO S
U
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| LT1715CMS#PBF | 制造商:Linear Technology 功能描述:High Speed Comparator IC |
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