LTC1391_1 Datasheet, PDF (1/12 Pages) Linear Technology – 8-Channel Analog Multiplexer with Cascadable Serial Interface

FEATURES
s _{Low RON: 45Ω}
s _{Single 2.7V to ±5V Supply Operation}
s _{Low Charge Injection}
s _{Serial Digital Interface}
s _{Analog Inputs May Extend to Supply Rails}
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
APPLICATIO S
s _{Data Acquisition Systems}
s _{Communication Systems}
s _{Signal Multiplexing/Demultiplexing}
LTC1391
8-Channel
Analog Multiplexer with
Cascadable Serial Interface
DESCRIPTIO
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 R_ON 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 APPLICATIO
3V, 8-Channel 12-Bit ADC
3V
1 _S0
V^{+ 16}
0.1µF OPTIONAL A/D
INPUT FILTER
1
V_REF
8
V_CC
1µF
ANALOG
INPUTS
2 _S1
3 _S2
4 _S3
5 _S4
6 _S5
D ¹⁵
V ^{– 14}
13
D_OUT
LTC1391 _DIN 12
11
CS
2
+IN
7
CLK
3
LTC1285
6
–IN
D_OUT
4 _{GND CS/SHDN} 5
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
T_A = 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
sn1391 1391fas
1