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參數(shù)資料
| 型號： | LTC1598IG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 4- and 8-Channel, Micropower Sampling 12-Bit Serial I/O A/D Converters |
| 中文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO24 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大?。?/td> | 430K |
| 代理商： | LTC1598IG |
12
LTC1594/LTC1598
after a delay of t
OFF
, all the channels are switched off to
ensure a break-before-make interval. After this interval,
the selected channel is switched on allowing signal
transmission. The selected channel remains on until the
next falling edge of CS and the process repeats itself with
the “EN” bit being logic high. If the “EN” bit is logic low,
all the channels are switched off simultaneously after a
delay of t
OFF
from CS being pulled low and all the
channels remain off until the next falling edge of CS.
Input Data Word
When CS is high, the LTC1594/LTC1598 clock data into
the D
IN
inputs on the rising edge of the clock and store the
data into a 4-bit register. The input data words are defined
as follows:
D0
EN
D2
D1
CHANNEL SELECTION
1594/98 AI02
“EN” Bit
The first bit in the 4-bit register is an “EN” bit. If the “EN”
bit is a logic high, as illustrated in Figure 1, it enables the
selected channel after a delay of t
ON
when the CS is pulled
low. If the “EN” bit is logic low, as illustrated in Figure 2,
it disables all channels after a delay of t
OFF
when the CS
is pulled low.
Multiplexer (MUX) Address
The 3 bits of input word following the “EN” bit select the
channel in the MUX for the requested conversion. For a
given channel selection, the converter will measure the
voltage of the selected channel with respect to the voltage
on the COM pin. Tables 1 and 2 show the various bit
combinations for the LTC1594/LTC1598 channel selection.
Table 1. Logic Table for the LTC1594 Channel Selection
CHANNEL STATUS
EN
All Off
0
CH0
1
CH1
1
CH2
1
CH3
1
D2
X
0
0
0
0
D1
X
0
0
1
1
DO
X
0
1
0
1
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Table 2. Logic Table for the LTC1598 Channel Selection
CHANNEL STATUS
EN
All Off
0
CH0
1
CH1
1
CH2
1
CH3
1
CH4
1
CH5
1
CH6
1
CH7
1
D2
X
0
0
0
0
1
1
1
1
D1
X
0
0
1
1
0
0
1
1
DO
X
0
1
0
1
0
1
0
1
Transfer Curve
The LTC1594/LTC1598 are permanently configured for
unipolar only. The input span and code assignment for
this conversion type is illustrated below.
Transfer Curve
0
1
V
R
–
V
REF
4096
V
R
–
V
R
V
IN
0 0 0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 0
1594/98 AI03
1LSB =
Output Code
OUTPUT CODE
0 0 0 0 0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1
1 1 1 1 1 1
INPUT VOLTAGE
V
REF
– 1LSB
V
REF
– 2LSB
1LSB
0V
INPUT VOLTAGE
(V
REF
= 5.000V)
4.99878V
4.99756V
0.00122V
0V
1594/98 AI04
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