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參數(shù)資料
| 型號： | LTC1289CI |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 3 Volt Single Chip 12-Bit Data Acquisition System |
| 中文描述： | 3伏單芯片12位數(shù)據(jù)采集系統(tǒng) |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 487K |
| 代理商： | LTC1289CI |
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LTC1289
U
S
A
O
PPLICATI
IU
U
Figure 6 shows an example of an ideal ground plane design
for a two-sided board. Of course, this much ground plane
will not always be possible, but users should strive to get
as close to this ideal as possible.
2. Bypassing
For good performance, V
CC
must be free of noise and ripple.
Any changes in the V
CC
voltage with respect to analog
ground during a conversion cycle can induce errors or
noise in the output code. V
CC
noise and ripple can be kept
below 0.5mV by bypassing the V
CC
pin directly to the analog
ground plane with a 22
μ
F tantalum capacitor and leads as
short as possible. The lead from the device to the V
CC
supply should also be kept to a minimum and the V
CC
supply should have a low output impedance such as that
obtained from a voltage regulator (e.g., LT1117). Using a
battery to power the LTC1289 will help reduce the amount
of bypass capacitance required on the V
CC
pin. A battery
placed close to the device will only require 10
μ
F to ad-
equately bypass the supply pin. Figure 7 shows the effect of
poor V
CC
bypassing. Figure 8a shows the settling of a
LT1117 low dropout regulator with a 22
μ
F bypass capaci-
tor. The noise and ripple is approximately 0.5mV. Figure 8b
shows the response of a lithium battery with a 10
μ
F bypass
capacitor. The noise and ripple is kept below 0.5mV.
Figure 7. Poor V
CC
Bypassing.
Noise and Ripple Can Cause A/D Errors.
Figure 8a. LT1117 Regulator with 22
μ
F Bypassing on V
CC
HORIZONTAL: 20
μ
s/DIV
5V/DIV
CS
0.5mV/DIV
V
CC
Figure 8b. Lithium Battery with 10
μ
F Bypassing on V
CC
HORIZONTAL: 20
μ
s/DIV
Figure 6. Example Ground Plane for the LTC1289
0.5mV/DIV
5V/DIV
CS
V
CC
V
HORIZONTAL: 10
μ
s/DIV
V
–
0.1μF
CERAMIC
DISK
22
μ
F
TANTALUM
V
CC
LTC1289 AIF06
ANALOG
GROUND
PLANE
0.1
μ
F
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1289BCJ | 3 Volt Single Chip 12-Bit Data Acquisition System |
| LTC1289BIJ | 3 Volt Single Chip 12-Bit Data Acquisition System |
| LTC1289BIN | 3 Volt Single Chip 12-Bit Data Acquisition System |
| LTC1289CIJ | 3 Volt Single Chip 12-Bit Data Acquisition System |
| LTC1289CIN | 3 Volt Single Chip 12-Bit Data Acquisition System |
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