LTC1391C Просмотр технического описания (PDF) - Linear Technology
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LTC1391C Datasheet PDF : 9 Pages
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LTC1391
8-Channel
Analog Multiplexer with
Cascadable Serial Interface
FEATURES
s Low RON: 45Ω
s Single 2.7V to ±5V Supply Operation
s Analog Inputs May Extend to Supply Rails
s Low Charge Injection
s Serial Digital Interface
s Low Leakage: ±5nA Max
s Guaranteed Break-Before-Make
s TTL/CMOS Compatible for All Digital Inputs
s Cascadable to Allow Additional Channels
s Can Be Used as a Demultiplexer
U
APPLICATIONS
s Data Acquisition Systems
s Communication Systems
s Signal Multiplexing/Demultiplexing
DESCRIPTION
The LTC ®1391 is a high performance CMOS 8-to-1 analog
multiplexer. It features a serial digital interface that allows
several LTC1391s to be daisy-chained together, increas-
ing the number of MUX channels available using a single
digital port.
The LTC1391 features a typical RON of 45Ω, a typical
switch leakage of 50pA and guaranteed break-before-
make operation. Charge injection is ±10pC maximum. All
digital inputs are TTL and CMOS compatible when oper-
ated from single or dual supplies. The inputs can with-
stand 100mA fault current.
The LTC1391 is available in 16-pin PDIP, SSOP and
narrow SO packages. For applications requiring 2-way
serial data transmission, see the LTC1390 data sheet.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
3V, 8-Channel 12-Bit ADC
3V
1 S0
V+ 16
0.1µF OPTIONAL A/D
INPUT FILTER
1
VREF
8
VCC
1µF
ANALOG
INPUTS
2 S1
3 S2
4 S3
5 S4
6 S5
D 15
V – 14
DOUT 13
LTC1391
12
DIN
11
CS
2
+IN
7
CLK
3
LTC1285
6
–IN
DOUT
4
5
GND CS/SHDN
7 S6
10
CLK
8 S7
9
GND
SERIAL INTERFACE
TO MUX AND ADC
DATA IN
CLK
CS
DATA OUT
1391 TA01
On-Resistance vs
Analog Input Voltage
300
TA = 25°C
250
200
V+ = 2.7V
V – = 0V
150
100
V+ = 5V
50
V – = –5V
0
–5 –4 –3 –2 –1 0 1 2 3
ANALOG INPUT VOLTAGE (V)
45
1391 TA02
1
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