SPI Interface, 4 Ω RON, ± ±1 ꢀV/±ꢁ ꢀV± 1 ꢀ,
±.8 ꢀ Logic Control, 8:±VDual 4:± Muxes
ADGS±408VADGS±409
Data Sheet
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
SPI interface with error detection
ADGS1408
Includes CRC, invalid read/write address, and SCLK count
error detection
S1
Supports burst mode and daisy-chain mode
Industry-standard SPI Mode 0 and SPI Mode 3 interface
compatible
D
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
S8
GPO1
GPO2
GPO3
GPO4
CNV
SDO
SPI
INTERFACE
0.5 Ω typical on-resistance flatness at 25°C
0.2 Ω typical on-resistance match between channels at 25°C
SCLK SDI CS RESET/V
L
Figure 1. ADGS1408 Functional Block Diagram
V
SS to VDD analog signal range
ADGS1409
Fully specified at 15 V, 5 V, and +12 V
Power-up sequence of VDD, VSS, and GND before applying
VL and digital/analog inputs
S1A
DA
S4A
1.8 V logic compatibility with 2.7 V ≤ VL ≤ 3.3 V
24-lead LFCSP package
S1B
APPLICATIONS
Automated test equipment
Data acquisition systems
Battery-powered systems
DB
S4B
GPO1
CNV
SDO
GPO2
GPO3
GPO4
GPO5
SPI
INTERFACE
Sample-and-hold systems
Audio signal routing
SCLK SDI CS RESET/V
Video signal routing
L
Communications systems
Figure 2. ADGS1409 Functional Block Diagram
Relay replacement
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.
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.
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.
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.
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.
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
Rev. 0
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