参数资料
型号: LTC2411CMS
英文描述: Analog-to-Digital Converter, 24-Bit
中文描述: 模拟到数字转换器,24比特
文件页数: 8/40页
文件大小: 450K
代理商: LTC2411CMS
LTC2411
16
Figure 5. External Serial Clock, Single Cycle Operation
Table 4. LTC2411 Interface Timing Modes
Conversion
Data
Connection
SCK
Cycle
Output
and
Configuration
Source
Control
Waveforms
External SCK, Single Cycle Conversion
External
CS and SCK
Figures 5, 6
External SCK, 2-Wire I/O
External
SCK
Figure 7
Internal SCK, Single Cycle Conversion
Internal
CS
CS
Figures 8, 9
Internal SCK, 2-Wire I/O, Continuous Conversion
Internal
Continuous
Internal
Figure 10
EOC
BIT 31
SDO
SCK
(EXTERNAL)
CS
TEST EOC
SUB LSB
MSB
SIG
BIT 0
LSB
BIT 5
BIT 27
BIT 26
BIT 28
BIT 29
BIT 30
SLEEP
DATA OUTPUT
CONVERSION
2411 F05
CONVERSION
= 50Hz REJECTION
= EXTERNAL OSCILLATOR
= 60Hz REJECTION
Hi-Z
VCC
TEST EOC
VCC
FO
REF+
REF
SCK
IN+
IN
SDO
GND
CS
110
2
3
9
4
5
8
6
7
REFERENCE
VOLTAGE
0.1V TO VCC
ANALOG INPUT RANGE
–0.5VREF TO 0.5VREF
1
F
2.7V TO 5.5V
LTC2411
3-WIRE
SPI INTERFACE
modes in detail. In all these cases, the converter can use
the internal oscillator (FO = LOW or FO = HIGH) or an
external oscillator connected to the FO pin. Refer to Table 4
for a summary.
External Serial Clock, Single Cycle Operation
(SPI/MICROWIRE Compatible)
This timing mode uses an external serial clock to shift out
the conversion result and a CS signal to monitor and
control the state of the conversion cycle, see Figure 5.
The serial clock mode is selected on the falling edge of CS.
To select the external serial clock mode, the serial clock pin
(SCK) must be LOW during each CS falling edge.
The serial data output pin (SDO) is Hi-Z as long as CS is
HIGH. At any time during the conversion cycle, CS may be
pulled LOW in order to monitor the state of the converter.
While CS is pulled LOW, EOC is output to the SDO pin.
EOC = 1 while a conversion is in progress and EOC = 0 if
the device is in the sleep state. Independent of CS, the
device automatically enters the low power sleep state once
the conversion is complete.
When the device is in the sleep state (EOC = 0), its
conversion result is held in an internal static shift regis-
ter. The device remains in the sleep state until the first
rising edge of SCK is seen while CS is LOW. Data is shifted
out the SDO pin on each falling edge of SCK. This enables
APPLICATIO S I FOR ATIO
WU
UU
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