參數(shù)資料
型號: DC1783A-F
廠商: Linear Technology
文件頁數(shù): 9/24頁
文件大?。?/td> 0K
描述: BOARD SAR ADC LTC2378-18
軟件下載: QuikEval II System
設(shè)計資源: DC1783A Design Files
DC1783A Schematic
標(biāo)準(zhǔn)包裝: 1
系列: QuikEval™
ADC 的數(shù)量: 1
位數(shù): 18
采樣率(每秒): 1M
數(shù)據(jù)接口: 串行,SPI?
輸入范圍: ±VREF
在以下條件下的電源(標(biāo)準(zhǔn)): 13.5mW @ 1MSPS
工作溫度: 0°C ~ 70°C
已用 IC / 零件: LTC2378-18
已供物品:
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LTC2378-18
17
237818f
TIMING DIAGRAMS
Normal Mode, Multiple Devices
Figure 14 shows multiple LTC2378-18 devices operating
in normal mode (CHAIN = 0) sharing CNV, SCK and SDO.
By sharing CNV, SCK and SDO, the number of required
signals to operate multiple ADCs in parallel is reduced.
Since SDO is shared, the RDL/SDI input of each ADC must
be used to allow only one LTC2378-18 to drive SDO at a
time in order to avoid bus conflicts. As shown in Figure 14,
the RDL/SDI inputs idle high and are individually brought
low to read data out of each device between conversions.
When RDL/SDI is brought low, the MSB of the selected
device is output onto SDO.
237818 F14a
RDLB
RDLA
CONVERT
IRQ
DATA IN
DIGITAL HOST
CLK
CNV
LTC2378-18
SDO
A
SCK
RDL/SDI
CNV
LTC2378-18
SDO
B
SCK
RDL/SDI
CHAIN
BUSY
CHAIN
237818 F14
D17A
SDO
SCK
CNV
BUSY
CHAIN = 0
RDL/SDIB
RDL/SDIA
D17B
D16B
D1B
D0B
D15B
D16A
D15A
D1A
D0A
Hi-Z
tEN
tHSDO
tDSDO
tDIS
tSCKL
tSCKH
tCNVL
12
3
16
17
18
19
20
21
34
35
36
tSCK
CONVERT
tQUIET
tCONV
tBUSYLH
POWER-DOWN AND ACQUIRE
POWER-DOWN
AND ACQUIRE
Figure 14. Normal Mode With Multiple Devices Sharing CNV, SCK and SDO
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