ADG1438 Datasheet, PDF (1/20 Pages) Analog Devices – Serially Controlled, ±15 V/+12 V/±5 V, 8-Channel/4-Channel, iCMOS Multiplexers/Matrix Switches

Serially Controlled, ±15 V/+12 V/±5 V, 8-Channel/
4-Channel, iCMOS Multiplexers/Matrix Switches
ADG1438/ADG1439
FEATURES
Serial interface up to 50 MHz
SDO daisy-chaining option
9.5 Ω on resistance @ 25°C
1.6 Ω on-resistance flatness
Fully specified at ±15 V/+12 V/±5 V
3 V logic-compatible inputs
Rail-to-rail operation
20-lead TSSOP and 20-lead ,4 mm × 4 mm LFCSP packages
APPLICATIONS
Relay replacement
Audio and video routing
Automatic test equipment
Data acquisition systems
Temperature measurement systems
Avionics
Battery-powered systems
Communication systems
Medical equipment
GENERAL DESCRIPTION
The ADG1438 and ADG1439 are CMOS analog matrix switches
with a serially controlled 3-wire interface. The ADG1438 is an
8-channel matrix switch, and the ADG1439 is a dual 4-channel
matrix switch.
The ADG1438/ADG1439 use a versatile 3-wire serial interface
that operates at clock rates of up to 50 MHz and is compatible
with standard SPI, QSPI™, MICROWIRE™, and DSP interface
standards. The output of the shift register, SDO, enables a
number of the ADG1438/ADG1439 parts to be daisy-chained.
On power-up, the internal shift register contains all zeros, and
all switches are in the off state.
Each switch conducts equally well in both directions when on,
making these parts suitable for both multiplexing and demulti-
plexing applications. Because each switch is turned on or off by
a separate bit, these parts can also be configured as a type of
switch array, where any, all, or none of the eight switches can be
closed at any time. The input signal range extends to the supply
rails. All channels exhibit break-before-make switching action,
preventing momentary shorting when switching channels.
FUNCTIONAL BLOCK DIAGRAM
ADG1438
S1
S8
INPUT SHIFT
REGISTER
S1A
S4A
D
S1B
S4B
SDO
ADG1439
INPUT SHIFT
REGISTER
DA
DB
SDO
SCLK SYNC DIN RESET
Figure 1.
SCLK SYNC DIN RESET
Figure 2.
The ultralow on resistance and on-resistance flatness of these
switches make them ideal solutions for data acquisition and
gain switching applications where low distortion is critical.
iCMOS® construction ensures ultralow power dissipation,
making the parts ideally suited for portable and battery-
powered instruments.
PRODUCT HIGHLIGHTS
1. 50 MHz serial interface.
2. 9.5 Ω on resistance.
3. 1.6 Ω on-resistance flatness.
4. 3 V logic-compatible digital input, VINH = 2.0 V, VINL = 0.8 V.
Table 1. Related Devices
Part No.
ADG1408/ADG1409
Description
Low on resistance, parallel
interface, 4-/8-channel ±15 V
multiplexers
Rev. 0
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