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參數(shù)資料
| 型號： | LTC1094CN#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 13/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DATA ACQ SYS 10BIT 8CH 20-DIP |
| 標(biāo)準(zhǔn)包裝： | 18 |
| 類型： | 數(shù)據(jù)采集系統(tǒng)（DAS），ADC |
| 分辨率（位）： | 10 b |
| 數(shù)據(jù)接口： | 串行 |
| 電壓電源： | 雙 ± |
| 電源電壓： | ±5V，4.5V，10V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 20-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 20-PDIP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1345 (CN2011-ZH PDF) |
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20
LTC1091/LTC1092
LTC1093/LTC1094
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
Figure 3. Several LTC1094s Sharing One 3-Wire Serial Interface
8 CHANNELS
3
3-WIRE SERIAL
INTERFACE TO OTHER
PERIPHERALS OR LTC1094s
2
10
OUTPUT PORT
SERIAL DATA
MPU
LTC1091-4 F03
LTC1094
CS
LTC1094
CS
LTC1094
CS
Sharing the Serial Interface
The LTC1094 can share the same 2- or 3-wire serial
interface with other peripheral components or other
LTC1094s (see Figure 3). In this case, the CS signals
decide which LTC1094 is being addressed by the MPU.
ANALOG CONSIDERATIONS
1. Grounding
The LTC1091/LTC1092/LTC1093/LTC1094 should be used
with an analog ground plane and single point grounding
techniques.
The AGND pin (GND on the LTC1091/LTC1092) should be
tied directly to this ground plane.
The DGND pin of the LTC1093/LTC1094 can also be tied
directly to this ground plane because minimal digital noise
is generated within the chip itself.
The VCC pin should be bypassed to the ground plane with
a 4.7
F tantalum with leads as short as possible. AVCC and
DVCC should be tied together on the LTC1094. The V– pin
(LTC1093/LTC1094) should be bypassed with a 0.1
F
ceramic disk. For single supply applications, V – can be
tied to the ground plane.
It is also recommended that the REF – pin and the COM pin
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 4. Example Ground Plane for the LTC1091
Figure 4 shows an example of an ideal LTC1091 ground
plane design for a 2-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, VCC must be free of noise and
ripple. Any changes in the VCC voltage with respect to
analog ground during a conversion cycle can induce
errors or noise in the output code. Because the VCC (VREF)
pin of the LTC1091 defines the voltage span of the A/D
converter, its bypassing is especially important. VCC noise
and ripple can be kept below 1mV by bypassing the VCC pin
directly to the analog ground plane with a 4.7
F tantalum
with leads as short as possible. AVCC and DVCC should be
tied together on the LTC1094. Figures 5 and 6 show the
effects of good and poor VCC bypassing.
1
2
3
4
S
8
7
6
5
4.7
F
TANTALUM
VCC
LTC1091-4 F04
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