1.8 V Logic Control, 8:1/Dual 4:1 Muxes

Data Sheet

ADGS1408/ADGS1409

Rev. 0

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FEATURES

SPI interface with error detection

Includes CRC, invalid read/write address, and SCLK count

error detection

Supports burst mode and daisy-chain mode

Industry-standard SPI Mode 0 and SPI Mode 3 interface

compatible

Round robin mode allows switching times comparable with a

parallel interface

General-purpose digital outputs to control other devices,

such as parallel switches from Analog Devices, Inc.

4 Ω typical on resistance at 25°C

0.5 Ω typical on-resistance flatness at 25°C

0.2 Ω typical on-resistance match between channels at 25°C

Fully specified at ±15 V, ±5 V, and +12 V

24-lead LFCSP package

APPLICATIONS

Automated test equipment

Data acquisition systems

Battery-powered systems

Sample-and-hold systems

Audio signal routing

Video signal routing

Communications systems

Relay replacement

FUNCTIONAL BLOCK DIAGRAMS

ADGS1408

S1

S8

SDO

GPO1

GPO2

GPO3

GPO4

CNV

D

SPI

INTERFACE

SCLK

SDI

Figure 1. ADGS1408 Functional Block Diagram

SPI

INTERFACE

SCLK

SDI

ADGS1409

S1A

S4B

DA

DB

S4A

S1B

SDO

GPO1

GPO2

GPO3

GPO4

GPO5

CNV

Figure 2. ADGS1409 Functional Block Diagram

GENERAL DESCRIPTION

The ADGS1408/ADGS1409 are analog multiplexers comprising

eight single channels and four differential channels, respectively.

A serial peripheral interface (SPI) controls the switches. The SPI

interface has robust error detection features such as cyclic

redundancy check (CRC) error detection, invalid read/write

address detection, and SCLK count error detection.

It is possible to daisy-chain multiple ADGS1408/ADGS1409

devices together. Daisy-chain mode enables the configuration of

multiple devices with a minimal amount of digital lines. The

ADGS1408/ADGS1409 can also operate in burst mode to

decrease the time between SPI commands.

iCMOS construction ensures ultra low power dissipation, making

the devices ideally suited for portable and battery-powered

instruments.

Each switch conducts equally well in both directions when on,

and each switch has an input signal range that extends to the

supplies. In the off condition, signal levels up to the supplies

are blocked.

The on-resistance profile is flat over the full analog input range,

which ensures linearity and low distortion when switching

audio signals.

PRODUCT HIGHLIGHTS

1.

SPI interface removes the need for parallel conversion,

logic traces, and reduces GPIO channel count.

2.

Daisy-chain mode removes additional logic traces when

multiple devices are used.

3.

CRC error detection, invalid read/write address detection,

and SCLK count error detection ensure a robust digital

interface.

4.

CRC and error detection capabilities allow the use of the

ADGS1408/ADGS1409 in safety critical systems.

5.

Minimal distortion.