參數(shù)資料
型號(hào)： LT1807IS8
元件分類： 運(yùn)算放大器
英文描述： Voltage-Feedback Operational Amplifier
中文描述： 電壓反饋運(yùn)算放大器
文件頁(yè)數(shù)： 20/24頁(yè)
文件大小： 314K
代理商： LT1807IS8
LT1806/LT1807
20
1MHz Series Resonant Crystal Oscillator with Square
and Sinusoid Outputs
Figure 8 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 resonance 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
with a measured jitter of 28ps
RMS
with a 5V supply and
40ps
RMS
with a 3V supply. On the other side of the crystal,
however, is an excellent looking sine wave except for the
fact of the small high frequency glitch caused by the fast
TYPICAL APPLICATIO S
edge and the crystal capacitance (middle trace of Fig-
ure9). Sinusoid amplitude stability is maintained by the
fact that the sine wave is basically a filtered version of the
square wave; the usual amplitude control loops associ-
ated with sinusoidal oscillators are not immediately nec-
essary.
1
One can make use of this sine wave by buffering
and filtering it, and this is the combined task of the LT1806.
It is configured as a bandpass filter with a Q of 5 and does
a good job of cleaning up and buffering the sine wave.
Distortion was measured at –70dBc and –60dBc on the
second and third harmonics.
1
Amplitude will be a linear function of comparator output swing, which is supply dependent and
therefore controllable. The important difference here is that any added amplitude stabilization loop
will not be faced with the classical task of avoiding regions of nonoscillation versus clipping.
–
+
8
SQUARE WAVE
V
S
V
S
V
S
1
7
4
5
R3
1k
R4
210
R1
1k
R8
2k
R9
2k
R5
6.49k
1k
R7
15.8k
R2
1k
1MHZ
AT-CUT
C1
0.1
μ
F
6
3
2
C2
0.1
μ
F
C4
100pF
C3
100pF
LT1713
LE
–
+
V
S
7
6
1 (NC)
4
18067 F08
V
S
= 2.7V TO 6V
3
2
LT1806
R6
162
100pF
SINE WAVE
Figure 8. LT1713 Comparator is Configured as a Series Resonant Crystal Oscillator.
The LT1806 Op Amp is Configured in a Q = 5 Bandpass Filter with f
C
= 1MHz
3V/DIV
1V/DIV
1V/DIV
200ns/DIV
1806 F09
Figure 9. Oscillator Waveforms with V
S
= 3V. Top Trace is Comparator Output.
Middle Trace is Crystal Feedback to Pin 2 at LT1713. Bottom Trace is Buffered,
Inverted and Bandpass Filtered with a Q of 5 by the LT1806
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1807IS8#PBF 功能描述:IC OPAMP R-R I/O DUAL LN 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR
LT1807IS8#TR 功能描述:IC OPAMP R-R I/O DUAL LN 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT
LT1807IS8#TRPBF 功能描述:IC OPAMP R-R I/O DUAL LN 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT
LT1807IS8PBF 制造商:Linear Technology 功能描述:Op Amp Dual Prec. Low Noise RRI/O SOIC8
LT1807IS8-PBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:325MHz, Single/Dual,Rail-to-Rail Input and Output, Low Distortion,Low Noise Precision Op Amps
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