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參數(shù)資料
| 型號： | LT1394 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 7ns, Low Power, Single Supply, Ground-Sensing Comparator(7ns, 低功耗，單電源，地電平敏感比較器) |
| 中文描述： | 7ns的，低功耗，單電源，地面遙感比較（7ns的，低功耗，單電源，地電平敏感比較器） |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 217K |
| 代理商： | LT1394 |
9
LT1394
APPLICATIO
S I
FOR
ATIO
U
W
U
U
Temperature-Compensated Crystal Oscillator (TXCO)
Figure 5 is a temperature-compensated crystal oscillator
(TXCO). This circuit reduces oscillator temperature drift
by inserting a temperature-dependent compensatory cor-
rection into the crystal’s frequency trimming network.
This open-loop correction technique relies on cancellation
of the temperature characteristics of the oscillator, which
are quite repeatable.
The LT1394 and associated components form the crystal
oscillator, operating similarly to Figure 3’s examples. The
LM134, a temperature-dependent current source, biases
A1. A1 takes gain referred to the LM134’s output and the
negative offset supplied via the 470k
-LT1004 reference
path. Note that the LT1004’s negative voltage bias is
bootstrapped from the oscillator’s output, maintaining
single supply operation. This arrangement delivers tem-
perature-dependent bias to the varactor diode, causing a
scaled variation in the crystal’s resonance versus ambient
temperature. The varactor’s bias-dependent capacitance
shift pulls crystal frequency to complement the circuit’s
temperature drift. The simple first order fit provided by the
compensation is very effective. Figure 6 shows results.
The –70ppm frequency shift over 0
°
C to 70
°
C is corrected
within a few ppm. The “FREQ SET” trim also biases the
varactor, allowing accurate output frequency setting. It is
worth noting that better compensation is possible by
including higher order terms in the temperature-to-volt-
age conversion.
18ns, 500
μ
V Sensitivity Comparator
The ultimate limitation on comparator sensitivity is avail-
able gain. Unfortunately, increasing gain invariably
involves giving up speed. The gain vs. speed trade-off in a
fast comparator is usually a practical compromise
designed to satisfy most applications. Some situations,
however, require more sensitivity (e.g., higher gain) with
minimal impact on speed. Figure 7’s circuit adds a differ-
ential preamplifier ahead of the LT1394, increasing gain.
This permits 500
μ
V comparisons in 18ns. A parallel path
DC stabilization approach eliminates preamplifier drift as
an error source. A1 is the differential preamplifier, operat-
ing at a gain of 100. Its output is AC-coupled to the LT1394.
Figure 3. Crystal Oscillators for Outputs to 30MHz. Circuit (b)’s
Damper Network Supresses Overtone Crystal’s Harmonic Modes
–
+
LT1394
2k
5V
2k
1MHz TO 10MHz
CRYSTAL (AT-CUT)
0.068
μ
F
OUTPUT
1394 F03
2k
–
+
LT1394
2k
5V
2k
2k
10MHz TO 25MHz
CRYSTAL (AT-CUT)
200pF
OUTPUT
820pF
22
(a)
(b)
1394 F04
–
+
LT1394
1k
5V
1k
1k
75pF
D1
OUTPUT
B
A
LOGIC INPUTS
AS MANY STAGES
AS DESIRED
XTAL A
1k
R
X
XTAL B
XTAL X
D2
D
X
2k
= 1N4148
GROUND XTAL CASES
Figure 4. Switchable Output Crystal Oscillator. Biasing A or B
High Places Associated Crystal in Feedback Path. Additional
Crystal Branches Are Permissible
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| LT1394CMS8 | 功能描述:IC COMPARATOR 7NS LOW PWR 8MSOP RoHS:否 類別:集成電路 (IC) >> 線性 - 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:- 類型:通用 元件數(shù):1 輸出類型:CMOS，推挽式，滿擺幅，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 安裝類型:表面貼裝 包裝:管件 其它名稱:Q3554586 |
| LT1394CMS8#PBF | 功能描述:IC COMPARATOR 7NS LOW PWR 8MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 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:- 類型:通用 元件數(shù):1 輸出類型:CMOS，推挽式，滿擺幅，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 安裝類型:表面貼裝 包裝:管件 其它名稱:Q3554586 |
| LT1394CMS8#TR | 功能描述:IC COMPARATOR 7NS LOW PWR 8MSOP RoHS:否 類別:集成電路 (IC) >> 線性 - 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:- 類型:通用 元件數(shù):1 輸出類型:CMOS，推挽式，滿擺幅，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 安裝類型:表面貼裝 包裝:管件 其它名稱:Q3554586 |
| LT1394CMS8#TRPBF | 功能描述:IC COMPARATOR 7NS LOW PWR 8MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 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:- 類型:通用 元件數(shù):1 輸出類型:CMOS，推挽式，滿擺幅，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 安裝類型:表面貼裝 包裝:管件 其它名稱:Q3554586 |
| LT1394CS8 | 功能描述:IC COMPARATOR LOW PWR 7NS 8-SOIC RoHS:否 類別:集成電路 (IC) >> 線性 - 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:- 類型:通用 元件數(shù):1 輸出類型:CMOS，推挽式，滿擺幅，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 安裝類型:表面貼裝 包裝:管件 其它名稱:Q3554586 |
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