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參數(shù)資料
| 型號： | 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） |
| 文件頁數(shù)： | 14/36頁 |
| 文件大小： | 388K |
| 代理商： | LTC2420 |
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14
LTC2420
APPLICATIU
W
U
U
INPUT FREQUENCY DEVIATION FROM NOTCH FREQUENCY (%)
–12
–8
–4
0
4
8
12
R
2420 F05
–60
–70
–80
–90
–100
–110
–120
–130
–140
Figure 5. LTC2420 Normal Mode Rejection When
Using an External Oscillator of Frequency f
EOSC
Whenever an external clock is not present at the F
O
pin, the
converter automatically activates its internal oscillator and
enters the Internal Conversion Clock mode. The LTC2420
operation will not be disturbed if the change of conversion
clock source occurs during the sleep state or during the
data output state while the converter uses an external
serial clock. If the change occurs during the conversion
state, the result of the conversion in progress may be
outside specifications but the following conversions will
not be affected. If the change occurs during the data output
state and the converter is in the Internal SCK mode, the
serial clock duty cycle may be affected but the serial data
stream will remain valid.
Table 3 summarizes the duration of each state as a
function of F
O
.
SERIAL INTERFACE
The LTC2420 transmits the conversion results and re-
ceives the start of conversion command through a syn-
chronous 3-wire interface. During the conversion and
sleep states, this interface can be used to assess the
converter status and during the data output state it is used
to read the conversion result.
Serial Clock Input/Output (SCK)
The serial clock signal present on SCK (Pin 7) is used to
synchronize the data transfer. Each bit of data is shifted out
the SDO pin on the falling edge of the serial clock.
In the Internal SCK mode of operation, the SCK pin is an
output and the LTC2420 creates its own serial clock by
dividing the internal conversion clock by 8. In the External
SCK mode of operation, the SCK pin is used as input. The
internal or external SCK mode is selected on power-up and
then reselected every time a HIGH-to-LOW transition is
detected at the CS pin. If SCK is HIGH or floating at power-
up or during this transition, the converter enters the inter-
nal SCK mode. If SCK is LOW at power-up or during this
transition, the converter enters the external SCK mode.
Table 3. LTC2420 State Duration
State
CONVERT
Operating Mode
Internal Oscillator
Duration
133ms
F
O
= LOW
(60Hz Rejection)
F
O
= HIGH
(50Hz Rejection)
F
O
= External Oscillator
with Frequency f
EOSC
kHz
(f
EOSC
/2560 Rejection)
160ms
External Oscillator
20510/f
EOSC
s
SLEEP
DATA OUTPUT
As Long As CS = HIGH Until CS = 0 and SCK
As Long As CS = LOW But Not Longer Than 1.26ms
(24 SCK cycles)
As Long As CS = LOW But Not Longer Than 256/f
EOSC
ms
(24 SCK cycles)
As Long As CS = LOW But Not Longer Than 24/f
SCK
ms
(24 SCK cycles)
Internal Serial Clock
F
O
= LOW/HIGH
(Internal Oscillator)
F
O
= External Oscillator with
Frequency f
EOSC
kHz
External Serial Clock with
Frequency f
SCK
kHz
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