參數(shù)資料
型號: LTC1391
廠商: LINEAR TECHNOLOGY CORP
元件分類: 運動控制電子
英文描述: Hex 2-Input NAND Drivers 20-PDIP 0 to 70
中文描述: 8-CHANNEL, SGL POLE SGL THROW SWITCH
文件頁數(shù): 6/9頁
文件大小: 159K
代理商: LTC1391
6
LTC1391
APPLICATIO
S I
FOR
ATIO
U
bits clocked into the LTC1391 shift register before CS is
taken low select the MUX channel that is turned on. This
allows a series of devices, with the D
OUT
of one device
connected to the D
IN
of the next device, to be programmed
with a single data stream.
W
U
U
Figure 6. Data Sequence for MUX Expansion
B2
B1
B0
CLK
CS
D
IN
1391 F06
ENA
A2
A1
A0
ENB
1
2
3
4
5
6
7
8
To ensure that only one channel is switched on at any one
time, two sets of channel selection bits are needed for
DATA as shown in Figure 6. The first data sequence is used
to switch off one MUX and the second data sequence is
used to select one channel from the other MUX or
vice versa. In other words, if bit “ENA” is high and bit
“ENB” is low, one channel of MUX A is switched on and all
channels of MUX B are switched off. If bit “ENA” is low and
bit “ENB” is high, all channels at MUX A are switched off
and one channel of MUX B is switched on. Care should be
taken to ensure that only one LTC1391 is enabled at any
one time to prevent two channels from being enabled
simultaneously.
Multiplexer Expansion
Several LTC1391s can be daisy-chained to expand the
number of multiplexer inputs. No additional interface
ports are required for the expansion. Figure 5 shows two
LTC1391s connected at their analog outputs to form a
16-to-1 multiplexer at the input to an LTC1400 A/D converter.
D2
D1
D3
D4
D5
D2
D1
D3
D4
D5
CLK
D
IN
D
OUT
1391 F04
1
2
3
4
Figure 4. Digital Data Transfer Operation
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
S0
S1
S2
S3
S4
S5
S6
S7
V
+
D
V
D
OUT
D
IN
CS
CLK
GND
ANALOG
INPUTS
LTC1391
A
1
2
3
4
8
7
6
5
V
SS
CONV
CLK
D
OUT
V
CC
A
IN
V
REF
GND
LTC1400
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
S0
S1
S2
S3
S4
S5
S6
S7
V
+
D
V
D
OUT
D
IN
CS
CLK
GND
LTC1391
B
5V
–5V
–5V
5V
DATA IN
CS
CLK
1391 F05
0.1
μ
F
ANALOG
INPUTS
0.1
μ
F
10
μ
F
10
μ
F
OPTIONAL A/D
INPUT FILTER
+
+
10
μ
F
+
0.1
μ
F
0.1
μ
F
0.1
μ
F
DATA
OUT
Figure 5. Daisy-Chaining Two LTC1391s for Expansion
相關(guān)PDF資料
PDF描述
LTC1391C Hex 2-Input NOR Drivers 20-SOIC 0 to 70
LTC1391CN 8-Channel Analog Multiplexer with Cascadable Serial Interface
LTC1391CS 8-Channel Analog Multiplexer with Cascadable Serial Interface
LTC1391I 8-Channel Analog Multiplexer with Cascadable Serial Interface
LTC1391IS 8-Channel Analog Multiplexer with Cascadable Serial Interface
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