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参数资料
| 型号： | LTC1063CSW#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/16页 |
| 文件大小： | 0K |
| 描述： | IC FILTR 5TH ORDER LOWPASS16SOIC |
| 标准包装： | 47 |
| 滤波器类型： | 巴特沃斯，低通开关电容器 |
| 频率 - 截止或中心： | 50kHz |
| 滤波器数： | 1 |
| 滤波器阶数： | 5th |
| 电源电压： | ±2.37 V ~ 8 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 1324 (CN2011-ZH PDF) |
LTC1063
9
1063fa
CLOCK FREQUENCY (MHz)
0.5
K
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
2.5
1063 F06
1.0
1.5
2.0
3.0
fCLK = K/RC
C = 10pF
TA = 25°C
VS = ±7.5V
VS = ±2.5V
VS = ±5V
CLOCK FREQUENCY (kHz)
0
f CLK
CHANGE
NORMALIZED
TO
ITS
25
°C
VALUE
(%)
4
3
2
1
0
–1
–2
–3
–4
400
1063 F05
100
200
300
500
C = 200pF
TA = –40°C
TA = 85°C
VS = ±2.5V
VS = ±5V
VS = ±7.5V
VS = ±5V
VS = ±2.5V
INTERNAL CLOCK FREQUENCY (kHz)
K
1.25
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
1063 F04b
100
300
500
VS = ±7.5V
VS = ±2.5V
FCLK = K/RC
C = 200pF
TA = 25°C
VS = ±5V
200
400
VIN
R
VOUT
1063 F04a
C
V–
V+
1
2
3
4
8
7
6
5
LTC1063
Self-Clocking Operation
The LTC1063 features an internal oscillator which can be
tuned via an external RC. The LTC1063’s internal oscillator
is primarily intended for generation of clock frequencies
below 500kHz. The first curve of the Typical Performance
Characteristics section shows how to quickly choose the
value of the RC for a given frequency. More precisely, the
frequency of the internal oscillator is equal to:
fCLK = K/RC
For clock frequencies (fCLK) below 100kHz, K equals 1.07.
Figure 4b shows the variation of the parameter K versus
clock frequency and power supply. First choose the de-
sired clock frequency, (fCLK < 500kHz), then through
Figure 4b pick the right value of K, set C = 200pF and solve
for R.
Example 1: fCUTOFF = 2kHz, fCLK = 200kHz, VS = ±5V,
TA = 25°C, K = 1.0, C = 200pF
then,
R = (1.0)/(200kHz
× 204pF) = 24.5k.
Figure 4b. fCLK vs K
Note a 4pF parasitic capacitance is assumed in parallel
with the external 200pF timing capacitor. Figure 5 shows
the clock frequency variation from – 40
°C to 85°C. The
200kHz clock of Example 1 will change by –1.75% at 85
°C.
Figure 5. fCLK vs Temperature
For a very limited temperature range, the internal oscillator
of the LTC1063 can be used to generate clock frequencies
above 500kHz (Figures 6 and 7). The data of Figure 6 is
derived from several devices. For a given external (RC)
value, the observed device-to-device clock frequency varia-
tion was
±1% (VS = ±5V), and ±1.25% for VS = ±2.5V.
Example 2:
fCUTOFF = 20kHz, fCLK = 2MHz, VS = ±7.5V,
TA = 25°C, C = 10pF
from Figure 6, K = 0.575,
and,
R = (0.575)/(2MHz
× 14pF) = 20.5k.
Figure 6. fCLK vs K
Figure 4a.
APPLICATIO S I FOR ATIO
WU
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