Document
Data Sheet
User Defined Fault Protection and Detection, 0.8 pC QINJ, 8:1/Dual 4:1 Multiplexers
ADG5248F/ADG5249F
FEATURES
User defined secondary supplies set overvoltage level Overvoltage protection up to −55 V and +55 V Power-off protection up to −55 V and +55 V Overvoltage detection on source pins Minimum secondary supply level: 4.5 V single-supply Interrupt flags indicate fault status
Low charge injection (QINJ): 0.8 pC Low drain/source on capacitance
ADG5248F: 19 pF ADG5249F: 14 pF Latch-up immune under any circumstance Known state without digital inputs present VSS to VDD analog signal range ±5 V to ±22 V dual supply operation 8 V to 44 V single-supply operation Fully specified at ±15 V, ±20 V, +12 V, and +36 V
APPLICATIONS
Analog input/output modules Process control/distributed control systems Data acquisition Instrumentation Avionics Automatic test equipment Communication systems Relay replacement
GENERAL DESCRIPTION
The ADG5248F and ADG5249F are 8:1 and dual 4:1 analog multiplexers. The ADG5248F switches one of eight inputs to a common output, and the ADG5249F switches one of four differential inputs to a common differential output. Each channel conducts equally well in both directions when on, and each channel has an input signal range that extends to the supplies. The primary supply voltages define the on-resistance profile, whereas the secondary supply voltages define the voltage level at which the overvoltage protection engages.
When no power supplies are present, the channel remains in the off condition, and the switch inputs are high impedance. Under normal operating conditions, if the analog input signal levels on any Sx pin exceed positive fault voltage (POSFV) or negative fault voltage (NEGFV) by a threshold voltage (VT), the channel turns off and that Sx pin becomes high impedance. If the switch on, the drain pin is pulled to the secondary supply voltage that was exceeded. Input signal levels up to +55 V or −55 V relative to ground are blocked, in both the powered and unpowered conditions.
Rev. 0
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FUNCTIONAL BLOCK DIAGRAMS
ADG5248F
S1
D
S8
FAULT DETECTION AND
SWITCH DRIVER
FF SF
13072-001
A0 A1 A2 EN POSFV NEGFV
Figure 1. ADG5248F Functional Block Diagram
ADG5249F
S1A S4A
DA
S1B S4B
DB
FAULT DETECTION AND
SWITCH DRIVER
FF SF
13072-002
A0 A1 EN POSFV NEGFV
Figure 2. ADG5249F Functional Block Diagram
The low capacitance and charge injection of these switches make them ideal solutions for data acquisition and sample-and-hold applications, where low glitch switching and fast settling times are required.
Note that, throughout this data sheet, multifunction pins, such as A0/F0, are referred to either by the entire pin name or by a single function of the pin, for example, A0, when only that function is relevant.
PRODUCT HIGHLIGHTS
1. Source pins are protected against voltages greater than the secondary supply rails, up to −55 V and +55 V.
2. Source pins are protected against voltages between −55 V and +55 V in an unpowered state.
3. Overvoltage detection with digital output indicates operating state of switches.
4. Trench isolation guards against latch-up. 5. Optimized for low charge injection and on capacitance. 6. The ADG5248F/ADG5249F can be operated from a dual
supply of ±5 V to ±22 V or a single power supply of 8 V to 44 V.
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ADG5248F/ADG5249F
TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagrams............................................................. 1 General Description ......................................................................... 1 Product Highlights ........................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3
±15 V Dual Supply ....................................................................... 3 ±20 V Dual Supply ....................................................................... 5 12 V Single Supply........................................................................ 7 36 V Si.