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參數(shù)資料
| 型號(hào)： | LTC6900CS5#TR |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 2/12頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC OSC SILICON 20MHZ TSOT23-5 |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 振蕩器 - 硅 |
| 頻率： | 1kHz ~ 20MHz |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 電流 - 電源： | 920µA |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | SOT-23-5 細(xì)型，TSOT-23-5 |
| 包裝： | 帶卷 (TR) |
| 供應(yīng)商設(shè)備封裝： | TSOT-23-5 |
| 安裝類型： | 表面貼裝 |
| 其它名稱： | LTC6900CS5#TR-ND LTC6900CS5TR |
LTC6900
10
6900fa
APPLICATIONS INFORMATION
Once RIN/RSET is known, calculate RSET from:
RSET =
10MHz
N
20k
fOSC(MAX)
VIN(MAX) V+
()+V
RES 1+
RIN
RSET
VRES
RIN
RSET
(3)
Example 1:
In this example, the oscillator output frequency has small
excursions. This is useful where the frequency of a system
should be tuned around some nominal value.
Let V+ = 3V, fOSC(MAX) = 2MHz for VIN(MAX) = 3V and
fOSC(MIN) = 1.5MHz for VIN = 0V. Solve for RIN/RSET by
Equation (2), yielding RIN/RSET = 9.9/1. RSET = 110.1k by
Equation (4). RIN = 9.9RSET = 1.089M. For standard resis-
tor values, use RSET = 110k (1%) and RIN = 1.1M (1%).
Figure 10 shows the measured fOSC vs VIN. The 1.5MHz
to 2MHz frequency excursion is quite limited, so the curve
of fOSC vs VIN is linear.
Example 2:
Vary the oscillator frequency by one octave per volt. As-
sume fOSC(MIN) = 1MHz and fOSC(MAX) = 2MHz, when the
input voltage varies by 1V. The minimum input voltage is
half supply, that is VIN(MIN) = 1.5V, VIN(MAX) = 2.5V and
V+ = 3V.
Equation (2) yields RIN/RSET=1.273andEquation(3)yields
RSET = 142.8k. RIN = 1.273RSET = 181.8k. For standard
resistor values, use RSET = 143k (1%) and RIN = 182k
(1%). Figure 11 shows the measured fOSC vs VIN. For VIN
higher than 1.5V, the VCO is quite linear; nonlinearities
occur when VIN becomes smaller than 1V, although the
VCO remains monotonic.
Maximum VCO Modulation Bandwidth
The maximum VCO modulation bandwidth is 25kHz; that
is, the LTC6900 will respond to changes in VIN at a rate
up to 25kHz. In lower frequency applications however, the
modulation frequency may need to be limited to a lower
rate to prevent an increase in output jitter. This lower limit
is the master oscillator frequency divided by 20, (fOSC/20).
In general, for minimum output jitter the modulation fre-
quency should be limited to fOSC/20 or 25kHz, whichever
is less. For best performance at all frequencies, the value
for fOSC should be the master oscillator frequency (N = 1)
when VIN is at the lowest level.
Figure 10. Output Frequency vs Input Voltage
Figure 11. Output Frequency vs Input Voltage
VIN (V)
0
0.5
1
1.5
2
2.5
3
f OSC
(MHz)
6900 F10
2.00
1.95
1.90
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.50
RIN = 1.1M
RSET = 110k
V+ = 3V
N = 1
VIN (V)
0
0.5
1
1.5
2
2.5
3
f OSC
(kHz)
6900 F11
3000
2500
2000
1500
1000
500
0
RIN = 182k
RSET = 143k
V+ = 3V
N = 1
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| LTC6900IS5 | 制造商:Linear Technology 功能描述:Silicon Oscillator 5-Pin TSOT-23 制造商:Linear Technology 功能描述:LOW POWER, 1KHZ TO 20MHZ RESISTOR SET SOT-23 OSCILLATOR |
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| LTC6900IS5#TR | 功能描述:IC OSC SILICON 20MHZ TSOT23-5 RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 可編程計(jì)時(shí)器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補(bǔ)償晶體振蕩器（TCXO） 計(jì)數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝 |
| LTC6900IS5#TRM | 功能描述:IC OSC SILICON 20MHZ TSOT23-5 RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 可編程計(jì)時(shí)器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補(bǔ)償晶體振蕩器（TCXO） 計(jì)數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝 |
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