參數(shù)資料
型號(hào)： LTC1090
廠商： Linear Technology Corporation
英文描述： Single Chip 10-Bit Data Acquisition System
中文描述： 單芯片10位數(shù)據(jù)采集系統(tǒng)
文件頁(yè)數(shù)： 18/28頁(yè)
文件大小： 344K
代理商： LTC1090
18
LTC1090
1090fc
6. Sharing the Serial Interface
The LTC1090 can share the same 3-wire serial interface
with other peripheral components or other LTC1090s (see
Figure 5). In this case, the CS signals decide which
LTC1090 is being addressed by the MPU.
ANALOG CONSIDERATIONS
1. Grounding
The LTC1090 should be used with an analog ground plane
and single point grounding techniques.
Pin 11 (AGND) should be tied directly to this ground plane.
Pin 10 (DGND) can also be tied directly to this ground
plane because minimal digital noise is generated within
the chip itself.
Pin 20 (V
CC
) should be bypassed to the ground plane with
a 4.7
μ
F tantalum with leads as short as possible. Pin 12
(V
–
) should be bypassed with a 0.1
μ
F ceramic disk. For
single supply applications, V
–
can be tied to the ground
plane.
It is also recommended that pin 13 (REF
–
) and pin 9 (COM)
be tied directly to the ground plane. All analog inputs
should be referenced directly to the single point ground.
Digital inputs and outputs should be shielded from and/or
routed away from the reference and analog circuitry.
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 1mV by bypassing the V
CC
pin directly to the
analog ground plane with a 4.7
μ
F tantalum with leads as
short as possible. Figures 7 and 8 show the effects of good
and poor V
CC
bypassing.
APPLICATIOU
W
U
U
Figure 7. Poor V
CC
Bypassing. Noise and Ripple
can Cause A/D Errors
Figure 6. Example Ground Plane for the LTC1090
HORIZONTAL: 10
μ
s/DIV
V
Figure 8. Good V
CC
Bypassing Keeps Noise and Ripple
on V
CC
Below 1mV
HORIZONTAL: 10
μ
s/DIV
V
20
V
CC
V –
10
11
LTC1090 AI15
ANALOG
GROUND
PLANE
0.1
μ
F CERAMIC DISK
4.7
μ
F TANTALUM
1
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參數(shù)描述
LTC1090AC 制造商:LINER 制造商全稱:Linear Technology 功能描述:Single Chip 10-Bit Data Acquisition System
LTC1090ACJ 制造商:LINER 制造商全稱:Linear Technology 功能描述:Single Chip 10-Bit Data Acquisition System
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LTC1090AM 制造商:LINER 制造商全稱:Linear Technology 功能描述:Single Chip 10-Bit Data Acquisition System
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