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参数资料
| 型号： | LTC6900IS5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 2/12页 |
| 文件大小： | 0K |
| 描述： | IC OSC SILICON 20MHZ TSOT23-5 |
| 标准包装： | 2,500 |
| 类型： | 振荡器 - 硅 |
| 频率： | 1kHz ~ 20MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 电流 - 电源： | 920µA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-5 |
| 安装类型： | 表面贴装 |
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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