1
LTC1390
sn1390 1390fs
8-Channel
Analog Multiplexer
with Serial Interface
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ESCRIPTIO
The LTC
®
1390 is a high performance CMOS 8-to-1 analog
multiplexer. It features a 3-wire digital interface with a
bidirectional data retransmission feature, allowing it to be
wired in series with a serial A/D converter while using only
one serial port. The interface also allows several LTC1390s
to be wired in series or parallel, increasing the number of
MUX channels available using only a single digital port. All
the above features are also valid when LTC1390 operates
as a demultiplexer such as with a D/A converter.
The LTC1390 features a typical R
ON
of 45Ω, typical switch
leakage of 50pA, and guaranteed break-before-make op-
eration. Charge injection is ±10pC maximum. All digital
inputs are TTL and CMOS compatible when operated from
single or dual supplies. The inputs can withstand 100mA
fault currents.
The LTC1390 is available in 16-pin PDIP and narrow SO
packages.
■
3-Wire Serial Digital Interface
■
Data Retransmission Allows Series Connection
with Serial A/D Converters
■
Single 3V to ±5V Supply Operation
■
Analog Inputs May Extend to Supply Rails
■
Low Charge Injection
■
Low R
ON
: 75Ω Max
■
Low Leakage: ±5nA Max
■
Guaranteed Break-Before-Make
■
TTL/CMOS Compatible for All Digital Inputs
■
Cascadable to Allow Additional Channels
■
Can Be Used as a Demultiplexer
■
Data Acquisition Systems
■
Communication Systems
■
Signal Multiplexing/Demultiplexing
U
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A
O
PP
L
IC
AT
I
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
A
O
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L
IC
AT
ITY
P
I
CA
L
ANALOG INPUT VOLTAGE, V
S
(V)
–5
ON-RESISTANCE (Ω)
150
200
250
3
LTC1390 • TA02
100
50
0
–3
–1
1
–4 4
–2
0
2
5
V
+
= 3V
V
–
= 0V
V
+
= 5V
V
–
= –5V
T
A
= 25°C
ON-Resistance vs
Analog Input Voltage
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
–
DATA 2
DATA 1
CS
CLK
GND
ANALOG
INPUTS
3-WIRE
SERIAL
INTERFACE
TO MUX AND ADC
DATA
CLK
CS
LTC1390
V
CC
V
CC
V
CC
47k
V
EE
1
2
3
4
8
7
6
5
CS
+IN
–IN
GND
V
CC
CLK
D
OUT
V
REF
LTC1096
LTC1390 • TA01
OPTIONAL A/D
INPUT FILTER
