Datasheet ADGS1408, ADGS1409 (Analog Devices)

SPI Interface, 4 Ω RON, ±15 V/+12 V/±5 V, 1.8 V Logic Control, 8:1/Dual 4:1 Muxes Data Sheet ADGS1408/ ADGS1409 FEATURES FUNCTIONAL BLOCK DIAGRAMS SPI interface with error detection ADGS1408 Includes CRC, invalid read/write address, and SCLK count S1 error detection Supports burst mode and daisy-chain mode Industry-standard SPI Mode 0 and SPI Mode 3 interface D compatible Round robin mode allows switching times comparable with a parallel interface S8 General-purpose digital outputs to control other devices, GPO1 GPO2 CNV SPI such as parallel switches from Analog Devices, Inc. GPO3 INTERFACE SDO GPO4 4 Ω typical on resistance at 25°C
001
0.5 Ω typical on-resistance flatness at 25°C
1-
SCLK SDI CS RESET/VL
79 16
0.2 Ω typical on-resistance match between channels at 25°C
Figure 1. ADGS1408 Functional Block Diagram
VSS to VDD analog signal range Fully specified at ±15 V, ±5 V, and +12 V ADGS1409 Power-up sequence of VDD, VSS, and GND before applying S1A V DA L and digital/analog inputs S4A 1.8 V logic compatibility with 2.7 V ≤ VL ≤ 3.3 V 24-lead LFCSP package S1B APPLICATIONS DB Automated test equipment S4B Data acquisition systems GPO1 GPO2 SPI CNV Battery-powered systems GPO3 INTERFACE SDO GPO4 Sample-and-hold systems GPO5 Audio signal routing
2 00
Video signal routing SCLK SDI CS RESET/V
91-
L
167
Communications systems
Figure 2. ADGS1409 Functional Block Diagram
Relay replacement GENERAL DESCRIPTION
supplies. In the off condition, signal levels up to the supplies The ADGS1408/ADGS1409 are analog multiplexers comprising are blocked. eight single channels and four differential channels, respectively. The on-resistance profile is flat over the full analog input range, A serial peripheral interface (SPI) controls the switches. The SPI which ensures linearity and low distortion when switching interface has robust error detection features such as cyclic audio signals. redundancy check (CRC) error detection, invalid read/write
PRODUCT HIGHLIGHTS
address detection, and SCLK count error detection. 1. SPI interface removes the need for parallel conversion, It is possible to daisy-chain multiple ADGS1408/ADGS1409 logic traces, and reduces GPIO channel count. devices together. Daisy-chain mode enables the configuration of 2. Daisy-chain mode removes additional logic traces when multiple devices with a minimal amount of digital lines. The multiple devices are used. ADGS1408/ADGS1409 can also operate in burst mode to 3. CRC error detection, invalid read/write address detection, decrease the time between SPI commands. and SCLK count error detection ensure a robust digital interface. iCMOS construction ensures ultra low power dissipation, making 4. CRC and error detection capabilities allow the use of the the devices ideally suited for portable and battery-powered ADGS1408/ADGS1409 in safety critical systems. instruments. 5. Minimal distortion. Each switch conducts equally well in both directions when on, and each switch has an input signal range that extends to the
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAMS GENERAL DESCRIPTION PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ±15 V DUAL SUPPLY ±5 V DUAL SUPPLY 12 V SINGLE SUPPLY CONTINUOUS CURRENT PER CHANNEL, Sx OR Dx TIMING CHARACTERISTICS Timing Diagrams ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS TERMINOLOGY THEORY OF OPERATION ADDRESS MODE ERROR DETECTION FEATURES CRC Error Detection SCLK Count Error Detection Invalid Read/Write Address Error Detection CLEARING THE ERROR FLAGS REGISTER BURST MODE SOFTWARE RESET DAISY-CHAIN MODE POWER-ON RESET ROUND ROBIN MODE GENERAL-PURPOSE OUTPUTS (GPOs) APPLICATIONS INFORMATION DIGITAL INPUT BUFFERS POWER SUPPLY RAILS POWER SUPPLY RECOMMENDATIONS POWER SUPPLY SEQUENCING REGISTER SUMMARIES REGISTER DETAILS SWITCH DATA REGISTER ERROR CONFIGURATION REGISTER ERROR FLAGS REGISTER BURST ENABLE REGISTER ROUND ROBIN ENABLE REGISTER ROUND ROBIN CHANNEL CONFIGURATION REGISTER CNV EDGE SELECT REGISTER SOFTWARE RESET REGISTER OUTLINE DIMENSIONS ORDERING GUIDE