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參數(shù)資料
| 型號： | LTC1063CSW#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 16/16頁 |
| 文件大小： | 0K |
| 描述： | IC FILTR 5TH ORDER LOWPASS16SOIC |
| 標準包裝： | 47 |
| 濾波器類型： | 巴特沃斯，低通開關(guān)電容器 |
| 頻率 - 截止或中心： | 50kHz |
| 濾波器數(shù)： | 1 |
| 濾波器階數(shù)： | 5th |
| 電源電壓： | ±2.37 V ~ 8 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 16-SOIC |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 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
UU
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