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LTC1390

8-Channel

Analog Multiplexer

with Serial Interface

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FEATURE

DESCRIPTIO

The LTC

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.

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.

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3-Wire Serial Digital Interface

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Data Retransmission Allows Series Connection

with Serial A/D Converters

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Single 3V to

±5V Supply Operation

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Analog Inputs May Extend to Supply Rails

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Low Charge Injection

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Low Leakage:

±5nA Max

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Guaranteed Break-Before-Make

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TTL/CMOS Compatible for All Digital Inputs

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Cascadable to Allow Additional Channels

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Can Be Used as a Demultiplexer

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Data Acquisition Systems

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Communication Systems

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Signal Multiplexing/Demultiplexing

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APPLICATI

, LTC and LT are registered trademarks of Linear Technology Corporation.

APPLICATI

TYPICAL

–5

150

200

250

3

LTC1390 • TA02

100

50

0

–3

–1

1

–4

4

–2

0

2

5

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

D

DATA 2

DATA 1

CS

CLK

GND

ANALOG

INPUTS

3-WIRE

SERIAL

INTERFACE

TO MUX AND ADC

DATA

CLK

CS

LTC1390

47k

1

2

3

4

8

7

6

5

CS

+IN

–IN

GND

CLK

LTC1096

LTC1390 • TA01

OPTIONAL A/D

INPUT FILTER