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參數(shù)資料
| 型號(hào)： | LTC2420 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Micropower 20-bit ADC(微功耗，20位串行模數(shù)轉(zhuǎn)換器) |
| 中文描述： | 微功耗20位ADC（微功耗，20位串行模數(shù)轉(zhuǎn)換器） |
| 文件頁(yè)數(shù)： | 15/36頁(yè) |
| 文件大小： | 388K |
| 代理商： | LTC2420 |
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15
LTC2420
APPLICATIU
Serial Data Output (SDO)
The serial data output pin, SDO (Pin 6), drives the serial
data during the data output state. In addition, the SDO pin
is used as an end of conversion indicator during the
conversion and sleep states.
When CS (Pin 5) is HIGH, the SDO driver is switched to a
high impedance state. This allows sharing the serial
interface with other devices. If CS is LOW during the
convert or sleep state, SDO will output EOC. If CS is LOW
during the conversion phase, the EOC bit appears HIGH on
the SDO pin. Once the conversion is complete, EOC goes
LOW. The device remains in the sleep state until the first
rising edge of SCK occurs while CS is LOW.
W
U
U
Chip Select Input (CS)
The active LOW chip select, CS (Pin 5), is used to test the
conversion status and to enable the data output transfer as
described in the previous sections.
In addition, the CS signal can be used to trigger a new
conversion cycle before the entire serial data transfer has
been completed. The LTC2420 will abort any serial data
transfer in progress and start a new conversion cycle any-
time 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 while CS is 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
. Tying a
capacitor to CS will reduce the output rate and power
dissipation by a factor proportional to the capacitor’s
value, see Figures 13 to 15.
SERIAL INTERFACE TIMING MODES
The LTC2420’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
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 6.
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
Table 4. LTC2420 Interface Timing Modes
Conversion
Cycle
Control
CS and SCK
SCK
CS
↓
Continuous
C
EXT
Data
Output
Control
CS and SCK
SCK
CS
↓
Internal
Internal
Connection
and
Waveforms
Figures 6, 7
Figure 8
Figures 9, 10
Figure 11
Figure 12
SCK
Source
External
External
Internal
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
Internal SCK, Autostart Conversion
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