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參數(shù)資料
| 型號： | LTC2439-1 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | ADC |
| 英文描述： | 8-/16-Channel 16-Bit No Latency Delta-Sigma ADC |
| 中文描述： | 8-/16-Channel 16位無延遲增量累加模數(shù)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 288K |
| 代理商： | LTC2439-1 |
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LTC2439-1
13
24391f
APPLICATIOU
W
U
U
Table 3. LTC2439-1 Output Data Format
Differential Input Voltage
V
IN
*
V
IN
*
≥
0.5 V
REF
**
0.5 V
REF
** – 1LSB
0.25 V
REF
**
0.25 V
REF
** – 1LSB
0
–1LSB
Bit 18
EOC
0
0
Bit 17
DMY
0
0
Bit 16
SIG
1
1
Bit 15
MSB
1
0
Bit 14
Bit 13
Bit 12
…
Bit 0
0
1
0
1
0
1
…
…
0
1
0
0
0
0
1
1
0
0
1
0
0
1
0
1
…
…
0
1
0
0
0
0
1
0
0
1
0
1
0
1
0
1
…
…
0
1
–0.25 V
REF
**
–0.25 V
REF
** – 1LSB
–0.5 V
REF
**
V
IN
* < –0.5 V
REF
**
*The differential input voltage V
IN
= IN
+
– IN
–
. **The differential reference voltage V
REF
= REF
+
– REF
–
.
0
0
0
0
0
0
1
1
1
0
0
1
0
1
…
…
0
1
0
0
0
0
0
0
1
0
0
1
0
1
0
1
…
…
0
1
Table 4. LTC2439-1 State Duration
State
CONVERT
Operating Mode
Internal Oscillator
Duration
147ms, Output Data Rate
≤
6.8 Readings/s
F
O
= LOW
Simultaneous 50Hz/60Hz Rejection
F
O
= External Oscillator
with Frequency f
EOSC
kHz
(f
EOSC
/2560 Rejection)
External Oscillator
20510/f
EOSC
s, Output Data Rate
≤
f
EOSC
/20510 Readings/s
SLEEP
DATA OUTPUT
As Long As CS = HIGH Until CS = LOW and SCK
As Long As CS = LOW But Not Longer Than 1.09ms
(19 SCK cycles)
As Long As CS = LOW But Not Longer Than 152/f
EOSC
ms
(19 SCK cycles)
As Long As CS = LOW But Not Longer Than 19/f
SCK
ms
(19 SCK cycles)
Internal Serial Clock
F
O
= LOW
(Internal Oscillator)
F
O
= External Oscillator with
Frequency f
EOSC
kHz
External Serial Clock with
Frequency f
SCK
kHz
In the Internal SCK mode of operation, the SCK pin is an
output and the LTC2439-1 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 de-
tected at the CS pin. If SCK is HIGH or floating at power-
up or during this transition, the converter enters the internal
SCK mode. If SCK is LOW at power-up or during this tran-
sition, the converter enters the external SCK mode.
Serial Data Input (SDI)
The serial data input pin, SDI (Pin 20), is used to shift in the
channel control bits during the data output state to prepare
the channel selection for the following conversion.
SERIAL INTERFACE PINS
The LTC2439-1 transmits the conversion results and re-
ceives the start of conversion command through a syn-
chronous 4-wire interface. During the conversion and sleep
states, this interface can be used to assess the converter
status and during the data I/O state it is used to read the
conversion result and write in channel selection bits.
Serial Clock Input/Output (SCK)
The serial clock signal present on SCK (Pin 18) 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 and each
input bit is shifted in the SDI pin on the rising edge of the
serial clock.
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| LTC24391IGN | 制造商:Linear Technology 功能描述: |
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