參數(shù)資料
型號： DC798B
廠商： Linear Technology
文件頁數(shù)： 18/42頁
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2480
軟件下載： QuikEval System
設計資源： DC798B Design File
DC798B Schematic
標準包裝： 1
系列： QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 7.5
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
已用 IC / 零件： LTC2480
已供物品： 板
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LTC2480
2480fd
CS remains LOW during the data output state. However,
the data output state may be aborted by pulling CS HIGH
anytime between the first and 24th rising edge of SCK (see
Figure 9). On the rising edge of CS, the device aborts the
data output state and immediately initiates a new conver-
sion. If the device has not finished loading the last input
bit SPD of SDI by the time CS is pulled HIGH, the SDI
information is discarded and the previous configuration
is still kept. This is useful for systems not requiring all 24
bits of output data, aborting an invalid conversion cycle,
or synchronizing the start of a conversion. If CS is pulled
HIGH while the converter is driving SCK LOW, the internal
pull-upisnotavailabletorestoreSCKtoalogicHIGHstate.
This will cause the device to exit the internal serial clock
mode on the next falling edge of CS. This can be avoided
by adding an external 10k pull-up resistor to the SCK pin
or by never pulling CS HIGH when SCK is LOW.
Whenever SCK is LOW, the LTC2480’s internal pull-up at
pin SCK is disabled. Normally, SCK is not externally driven
if the device is in the internal SCK timing mode. However,
certainapplicationsmayrequireanexternaldriveronSCK.
If this driver goes Hi-Z after outputting a LOW signal, the
LTC2480’s internal pull-up remains disabled. Hence, SCK
remains LOW. On the next falling edge of CS, the device is
switched to the external SCK timing mode. By adding an
external 10k pull-up resistor to SCK, this pin goes HIGH
once the external driver goes Hi-Z. On the next CS falling
edge, the device will remain in the internal SCK timing
mode.
A similar situation may occur during the sleep state when
CS is pulsed HIGH-LOW-HIGH in order to test the conver-
sion status. If the device is in the sleep state (EOC = 0),
SCK will go LOW. Once CS goes HIGH (within the time
period defined above as tEOCtest), the internal pull-up is
activated. For a heavy capacitive load on the SCK pin, the
internal pull-up may not be adequate to return SCK to a
HIGH level before CS goes low again. This is not a concern
under normal conditions where CS remains LOW after
detecting EOC = 0. This situation is easily overcome by
adding an external 10k pull-up resistor to the SCK pin.
applicaTions inForMaTion
EN
GS2
GS1
GS0
IM
FA
FB
SPD
SDI*
DON’T CARE
SDO
SCK
(INTERNAL)
CS
>tEOCtest
MSB
SIG
BIT 8
TEST EOC
(OPTIONAL)
TEST EOC
BIT 19
BIT 18
BIT 17
BIT 16
BIT 20
BIT 21
BIT 22
EOC
BIT 23
EOC
BIT 0
SLEEP
DATA OUTPUT
Hi-Z
DATA
OUTPUT
CONVERSION
SLEEP
2480 F09
<tEOCtest
TEST EOC
VCC
FO
VREF
IN+
IN–
SCK
SDI
SDO
CS
GND
2
10
INT/EXT CLOCK
3
4
5
9
10k
VCC
7
8
6
1
REFERENCE
VOLTAGE
0.1V TO VCC
ANALOG
INPUT
1F
2.7V TO 5.5V
LTC2480
4-WIRE
SPI INTERFACE
Figure 9. Internal Serial Clock, Reduce Data Output Length
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