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參數(shù)資料
| 型號： | LTC1294 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Single Chip 12-Bit Data Acquisition System(單片，12位數(shù)據(jù)采集系統(tǒng)) |
| 中文描述： | 單芯片12位數(shù)據(jù)采集系統(tǒng)（單片，12位數(shù)據(jù)采集系統(tǒng)） |
| 文件頁數(shù)： | 18/28頁 |
| 文件大?。?/td> | 403K |
| 代理商： | LTC1294 |
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18
LTC1293/LTC1294/LTC1296
U
S
A
O
PPLICATI
U
U
LTC1294. Figure 4 shows an example of an ideal LTC1293/
4/6 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.
Bypassing
For good performance, V
CC
must be free of noise and
ripple. Any changes in the V
CC
voltage with respect to
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 minimum of 22
μ
F tantalum
capacitor and with leads as short as possible. The lead
from the device to the V
CC
supply also should be kept to a
minimum and the V
CC
supply should have a low output
impedance such as obtained from a voltage regulator
(e.g., LT323A). For high frequency bypassing a 0.1
μ
F
ceramic disk placed in parallel with the 22
μ
F is recom-
mended. Again the leads should be kept to a minimum.
Figure 5 and 6 show the effects of good and poor V
CC
bypassing.
HORIZONTAL: 10
μ
s/DIV
V
V
HORIZONTAL: 10
μ
s/DIV
Figure 5. Poor V
CC
Bypassing.
Noise and Ripple Can Cause A/D Errors.
Figure 6. Good V
CC
Bypassing Keeps Noise
and Ripple on V
CC
Below 1mV
CS
V
CC
Analog Inputs
Because of the capacitive redistribution A/D conversion
techniques used, the analog inputs of the LTC1293/4/6
have capacitive switching input current spikes. These
current spikes settle quickly and do not cause a problem.
If large source resistances are used or if slow settling op
amps drive the inputs, take care to insure the transients
caused by the current spikes settle completely before the
conversion begins.
Figure 4. Ground Plane for the LTC1293/4/6
Figure 7. Analog Input Equivalent Circuit
6TH CLK
↑
R
ON
= 500
8TH CLK
↓
C
=
100pF
LTC1293/4/6
“+”
INPUT
R
SOURCE
+
V
IN
+
C1
“–”
INPUT
R
SOURCE
–
V
IN
–
C2
LTC1293 F07
V
–
0.1μF
CERAMIC
DISK
22
μ
F
TANTALUM
V
CC
LTC1293 F04
ANALOG
GROUND
PLANE
0.1
μ
F
CERAMIC
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2
3
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5
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| LTC1294BCN | 功能描述:IC DATA ACQ SYSTEM 12BIT 20-DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| LTC1294BCN#PBF | 功能描述:IC DATA ACQ SYSTEM 12BIT 20-DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
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