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參數(shù)資料
| 型號(hào)： | LTC1069-1IN8#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 8/10頁 |
| 文件大小： | 0K |
| 描述： | IC FILTR 8TH ORDER LOWPASS 8-DIP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 濾波器類型： | 橢圓，低通開關(guān)電容器 |
| 頻率 - 截止或中心： | 12kHz |
| 濾波器數(shù)： | 1 |
| 濾波器階數(shù)： | 8th |
| 電源電壓： | ±1.57 V ~ 5.5 V |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 8-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 8-PDIP |
| 包裝： | 管件 |
LTC1069-1
7
10691fa
APPLICATIONS INFORMATION
Temperature Behavior
The power supply current of the LTC1069-1 has a positive
temperature coefcient. The GBW product of its internal
op amps is nearly constant and the speed of the device
does not degrade at high temperatures. Figures 3a, 3b and
3c show the behavior of the maximum passband of the
device for various supplies and temperatures. The lter,
especially at ±5V supply, has a passband behavior which
is nearly temperature independent.
Clock Feedthrough
The clock feedthrough is dened as the RMS value of the
clock frequency and its harmonics that are present at the
lter’s output pin (8). The clock feedthrough is tested with
the input pin (4) shorted to the AGND pin and depends on
PC board layout and on the value of the power supplies.
With proper layout techniques the values of the clock
feedthrough are shown on Table 2.
Table 2. Clock Feedthrough
VS
CLOCK FEEDTHROUGH
3.3V
10μVRMS
5V
40μVRMS
±5V
160μVRMS
Any parasitic switching transients during the rise and
fall edges of the incoming clock are not part of the clock
feedthrough specications. Switching transients have
frequency contents much higher than the applied clock;
their amplitude strongly depends on scope probing tech-
niques as well as grounding and power supply bypassing.
The clock feedthrough can be reduced, if bothersome, by
adding a single RC lowpass lter at the output pin (8) of
the LTC1069-1.
Wideband Noise
The wideband noise of the lter is the total RMS value
of the device’s noise spectral density and determines the
operating signal-to-noise ratio. Most of the wideband
noise frequency contents lie within the lter passband.
The wideband noise cannot be reduced by adding post
ltering. The total wideband noise is nearly independent
of the clock frequency and depends slightly on the power
supply voltage (see Table 3). The clock feedthrough speci
cations are not part of the wideband noise.
Table 3. Wideband Noise
VS
WIDEBAND NOISE
3.3V
100μVRMS
5V
108μVRMS
±5V
112μVRMS
Figure 3a
Figure 3b
Figure 3c
FREQUENCY (kHz)
0.5
GAIN
(dB)
6.5
10691 F03a
2.5
4.5
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
1.5
3.5
5.5
7.5
VS = 3.3V
fCLK = 750kHz
VIN = 0.5VRMS
TA = 85°C
TA = 25°C
TA = –40°C
FREQUENCY (kHz)
0.5
GAIN
(dB)
6.5
10691 F03b
2.5
4.5
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
1.5
3.5
5.5
7.5 8.5 9.5 10.5
VS = 5V
fCLK = 1MHz
VIN = 1.2VRMS
TA = 25°C
TA = 85°C
TA = –40°C
FREQUENCY (kHz)
1
GAIN
(dB)
13
10691 F03c
59
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
3
7
11
15
VS = ±5V
fCLK = 1.5MHz
VIN = 2VRMS
TA = 85°C
TA = –40°C
TA = 25°C
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