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參數(shù)資料
| 型號(hào)： | LTC2424C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit 2.5-V to 3.3-V/3.3-V To 5-V Level Shifting Transceiver With 3-State Outputs 54-BGA MICROSTAR JUNIOR -40 to 85 |
| 中文描述： | 4-/8-Channel 20位ADC的無(wú)延遲uPower |
| 文件頁(yè)數(shù)： | 17/36頁(yè) |
| 文件大?。?/td> | 409K |
| 代理商： | LTC2424C |
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LTC2412
17
2412f
APPLICATIU
W
U
U
anytime a LOW-to-HIGH transition is detected at the CS
pin after the converter has entered the data output state
(i.e., after the first rising edge of SCK occurs with
CS=LOW).
Finally, CS can be used to control the free-running modes
of operation, see Serial Interface Timing Modes section.
Grounding CS will force the ADC to continuously convert
at the maximum output rate selected by F
O
.
SERIAL INTERFACE TIMING MODES
The LTC2412’s 3-wire interface is SPI and MICROWIRE
compatible. This interface offers several flexible modes of
operation. These include internal/external serial clock,
2- or 3-wire I/O, single cycle conversion and autostart. The
following sections describe each of these serial interface
timing modes in detail. In all these cases, the converter
can use the internal oscillator (F
O
= LOW or F
O
= HIGH) or
an external oscillator connected to the F
O
pin. Refer to
Table4 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.
Figure 5. External Serial Clock, Single Cycle Operation
Table 4. LTC2412 Interface Timing Modes
Conversion
Cycle
Control
CS and SCK
SCK
CS
↓
Continuous
Data
Output
Control
CS and SCK
SCK
CS
↓
Internal
Connection
and
Waveforms
Figures 5, 6
Figure 7
Figures 8, 9
Figure 10
SCK
Source
External
External
Internal
Internal
Configuration
External SCK, Single Cycle Conversion
External SCK, 2-Wire I/O
Internal SCK, Single Cycle Conversion
Internal SCK, 2-Wire I/O, Continuous Conversion
EOC
BIT 31
SDO
SCK
(EXTERNAL)
CS
TEST EOC
SUB LSB
MSB
SIG
CH0/CH1
BIT 0
LSB
BIT 5
BIT 27
BIT 26
BIT 28
BIT 29
BIT 30
SLEEP
SLEEP
TEST EOC
(OPTIONAL)
DATA OUTPUT
CONVERSION
2412 F05
CONVERSION
Hi-Z
Hi-Z
Hi-Z
TEST EOC
= 50Hz REJECTION
= EXTERNAL OSCILLATOR
= 60Hz REJECTION
V
CC
V
CC
F
O
REF
+
SCK
CH1
+
CH1
–
SDO
GND
CS
1
14
2
3
13
6
7
12
8, 9, 10, 15, 16
11
REFERENCE
VOLTAGE
0.1V TO V
CC
CH0
+
CH0
–
4
5
ANALOG INPUT RANGE
–0.5V
REF
TO 0.5V
REF
1
μ
F
2.7V TO 5.5V
LTC2412
3-WIRE
SPI INTERFACE
REF
–
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