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  • +Documents
  • 1. Thermal Resistance Junction to Board (Theta JB): 2. Thermal Resistance Junction to Case (Theta JC):
  • 3.3V VL logic supply for ADG2128
  • AD8152 EVB
  • AD8152: Connection of DC inputs
  • AD8152: used as a DVI switch
  • AD8152_switch HDMI signals
  • AD8156: Can I drive AD8156 from LVDS and LVCMOS sources?
  • AD8156: multiplexer and OOB feature
  • AD8159: Layout
  • ADG1204: Connecting the exposed paddle to Vss
  • ADG1204: Optimal impedance level
  • ADG1204: What is the optimal impedance level for source and load to apply?
  • ADG1219: Spice modell to simulate the charge injection?
  • ADG1219: Supply voltage
  • ADG1236: Charge injection
  • ADG1409: ADG1409: Process technology / MTBF
  • ADG1434: IBIS model
  • ADG1436_leakage current
  • ADG1604 DC "Off resistance"
  • ADG1612: Minimum supply voltage
  • ADG2128 Output stage ( Hi, Lo, Hi Z) of the I/O when the switch is off
  • ADG3247:  Hotswapping
  • ADG3248: number of logic gates transistors used
  • ADG3300: Can I work with VCCA = VCCY?
  • ADG3304: Is this device compatible with I2C?
  • ADG3304: used as I2C level shifter
  • ADG3304_power up sequence
  • ADG3304_protection method
  • ADG3308 and indeterminate i/p o/p state's interface  query
  • ADG3308 bidirectional, setting the direction
  • ADG3308: Design queries
  • ADG330x unused inputs
  • ADG330x: devices is heating up - what is the reason
  • ADG333A switching frequency / bandwidth information?
  • ADG333A_Status_WhenInputFloat
  • ADG406: Unpowered usage
  • ADG409: Minimum power supply
  • ADG411: is ist possible to worf with a 3V Logic Level?
  • ADG411: logic threshold voltage over digital supply.
  • ADG412: Lower voltage supplies than specified
  • ADG419: supply voltage
  • ADG426_leakage data at 60C
  • ADG428:  Descrepancy between maximum operating temperature in selection tool and web page order guide
  • ADG438F: Bidirectional or unidirectional
  • ADG442: low logic level clamped to about -1V.
  • ADG451: Latch up
  • ADG451BR: Spectral Noise Density
  • ADG452: GND connections
  • ADG452: VL = 15V possible not not recommendable
  • ADG453: Perfomance from +/- 15 V power supply
  • ADG453: Power Up Sequence
  • ADG467: Fault free input range
  • ADG506: Overvoltage on the input
  • ADG506: Pin connection
  • ADG508 ADG509_digital control voltage range
  • ADG508A: Enquiry for product specification
  • ADG508AKN: Robustness
  • ADG508_thetaJC and maximumTJ
  • ADG5208: THD specifications missing at the ADG520x family
  • ADG5404, ADG1406, ADG442: case temperature:
  • ADG5436_unbalance power supply
  • ADG54xx Latch-up immune switches and multiplexers FAQ
  • ADG601: Digital input from a FET
  • ADG621_spec for 3.3v supply
  • ADG623: ESD Lavel for the AGD623
  • ADG659: Supply voltage
  • ADG701: Noise
  • ADG706: +/- 5V supplies
  • ADG706: Grounding
  • ADG706: Working as a demultiplexer
  • ADG708: Multiplexing 3V3 logic signals
  • ADG709: Life time
  • ADG712: overvoltage protection
  • ADG715 Operation with VDD=VSS=0V
  • ADG728: Input and output current for safe operation
  • ADG732 LFCSP exposed Pad
  • ADG733: Noise specification
  • ADG734 in audio application
  • ADG734: Usage without supplies
  • ADG788: ESD rating
  • ADG788: How much ESD can the ADG788 take?
  • ADG801_parallel multiple switch to reduce Ron
  • ADG804: Maximum voltage
  • ADG819BRM's branding is "SBC" although in the datasheet states "SNB".
  • ADG819_switching current
  • ADG884 Overvoltage
  • ADG884: Bandwidth simulation
  • ADG901: Max current
  • ADG936_About the insertion loss between DC to 50MHz
  • ADGS1412 FAQ
  • ADN4600 Design Support Files
  • ADN4604 Design Support Files
  • ADN4605 Design Support Files
  • ADN4612 Design Support Files
  • ADV3200_3201 Design Support Files
  • ADV3202_3203 Design Support Files
  • ADV3224_3225 Design Support Files
  • ADV3226_ADV3227 Design Support Files
  • ADV3228_3229 Design Support Files
  • Are Latch-up immune parts over-voltage fault protected?
  • Are these parts pin-pin compatible with existing parts?
  • Can I leave the exposed pad floating?
  • Can other channels really continue to operate as normal when another channel is in fault?
  • Can the ADG333 be powered from a single 24V supply?
  • Can the ADG452 be powered from a single 24V supply and 3.3V digital supply?
  • Can you explain Power-Off protection and its benefits?
  • Charge Injection
  • confusing redundant temperature spec info in datasheet
  • Cross talk when using ADG490 to mux thermocoules
  • Datasheet for SW01,SW02,SW03,SW04
  • Do you specify switch Off Resistance?
  • EVAL-ADG2128EBZ: What type of cable can I use to connect the board to my signal generator?
  • FAQ: ADG52xxF
  • FAQ: ADG5401F
  • FAQ: ADG54xx
  • FAQ: ADG54xxF
  • FAQ: Digital Crosspoint Switch Frequently Asked Questions
  • FIT reliablity data
  • General Switch/Mux FAQ
  • How do CMOS switch logic control voltage levels affect Idd?
  • How do the fault diagnostics work?
  • How should I manage unused or Not Connected pins?
  • I like the robustness of these parts to PSS issues and the good ESD performance but my application needs lower capacitance and good leakage performance.
  • Is it okay to connect the ADG1611BRUZ's and ADG1436YCPZ's Exposed Pad to Gnd?
  • Latch-up and how are these parts immune to it?
  • MAX14763ETA+ alternative
  • Maximum Pass Voltage on the ADG324x bus switches
  • MEMS Switch Technology FAQ's
  • Multiplexer Settling Time
  • Multiplexor and switch noise specifications
  • Power Supply sequencing requirements for ADG451, ADG452, ADG453
  • Radiation hardened/Space qualified parts
  • Replacement for ADG201ATQ
  • SPICE model not working with Altium Designer
  • Stencil opening for AD8158ACPZ
  • SW06: State of the switch when unpowered
  • Switch & Multiplexer Leakage Measurement Reduction Tutorial
  • Switches and Multiplexers Break-Before-Make Timing Considerations
  • Switches and Multiplexes Support Community
  • The ADG5248F offers �55V over-voltage protection.  What are the keys things I need to      understand about this Over-voltage protected switch compared to using a standard switch in      my application
  • These parts are good, but I need lower on resistance at �15V. Do you have any compatible parts?
  • Theta JA(Junction to Ambient Temperature) and Theta JC (Junction to case Temperature)
  • What are suitable applications for these parts?
  • What are the key benefits of these fault protected switches?
  • What are the system benefits of fault diagnostics?
  • What are the system benefits of overvoltage fault protection with secondary supplies?
  • What happens to the output during an over-voltage event?
  • What if I need to protect my device or downstream circuits against over-voltages?
  • What is the ESD rating of these devices and what is the benefit of the rating?
  • What is the minimum voltage that can be used with these parts?
  • What is the recommended supply sequence?
  • What is the role of the Control Echo Enable bit?
  • What will be the recovery time when switching from a channel in fault to a channel not in      fault?

FAQ: ADG54xxF

Q1. Can you explain the Fault detection function to me and how it may offer benefits to my system?
A1. The voltages on the source inputs of the ADG5412F are continuously monitored and the state of the switch is indicated by an active low digital output pin, FF. A HI signal (3V) indicates “no fault” condition and an LO signal (<0.8V) indicates an overvoltage has occurred on any of the four inputs.

       For systems that are sensitive during a start-up sequence, the active low operation of the flag allows the system to ensure that the ADG5412F is powered on and that all input voltages are within normal operating range before initiating operation. The FF pin introduces a means to diagnose systems in fault programmatically and can be used to stop long or expensive tests if a fault occurs.

        It offers more intelligence to the system, preventing differential signals that over-voltage on both channels presenting as “normal” operation.

        The FF pin is a weak pull-up (2.5uA) which allows the signals to be combined into a single interrupt for larger modules that contain multiple devices. It does not require an external pull-up resistor, but using a 1k ohms pull-up resistor to 5V (maximum) improves the recovery time, tDIGREC of the FF pin.


Q2. Can you explain Power-Off protection and its benefits?
A2.  The ADG5412F will provide protection to downstream circuitry against over-voltage conditions when it’s unpowered.

       This is very important for modules that may be unpowered but have signals present on the inputs. Power-off protection to down-stream circuitry cannot be guaranteed using discrete protection components.

       The ADG5412F Power Off protection guarantees the channel will remain in the OFF state and will Standoff up to ±55V ie no signal will get passed to the output protecting downstream components. On the ADG5412F, the supplies can be GNDed or Floating but GND must be present on the GND pin for the Power-Off function to work. If the supplies are GNDed during Power-Off you will get ~10nA of leakage on the output and if the supplies are floating the leakage peaks to10uA and levels out to ~300nA on the output, Dx.



Q3. The ADG5412F/ADG5413F offers ±55V over-voltage protection. What are the keys things I need to understand about this Over-voltage protected switch compared to using a standard switch in my application?
A3. The ADG5412F/ADG5413F are ideally suited as protective elements in signal chains that are sensitive to both channel impedance and overvoltage signals. During normal operation the ADG5412F behaves like a standard switch and can pass rail-rail signals. The ADG5412F offers 10? On resistance with excellent flatness ensuring minimum distortion in the system (THD+N = -100dB).

       The ADG5412F offers ±55V protection on the inputs with respect to GND. When the voltages on the Sx inputs exceed either rail by ~0.7V the switch will turn off and present high impedance to the input. (See Q4 for state of output during a fault). ±55V is the maximum voltage allowed on the Sx inputs on the ADG5412F and exceeding this limit may damage the ESD protection on the part.

       One other point to note, 80V is the maximum voltage that can be present across the OFF switch, (Sx to Dx = 80V) and 80V is the maximum voltage that can be present from the Sx inputs to the supplies, (Sx to VDD or VSS = 80V).

       Therefore, if you are using the part with 40V Single Supply the maximum voltage allowed on Sx is -40V and not  -55V.

       If you are switching signals with a bandwidth of 3MHz or greater, please reference the datasheet to understand the relationship between signal amplitude and bandwidth to ensure signal integrity.

Q4. What happens to the output during an over-voltage event?
A4. The default state is that the output, Dx goes high impedance. (ADG5412F/ADG5413F)
       If the part (ie ADG5404F, ADG5436F, ADG5462F) has a DR pin (Drain Response) the user can select how the output behaves during an Over-voltage event. If the DR pin is left floating or pulled high, the drain will remain high impedance and float. The voltage dissipates through the load and the voltage on the output, VD drops to 0V.

       If the DR pin is pulled low, then the drain will pull to the rail that was exceeded.

       If the part (ADG5462F) has a POSFV and NEGFV pin, and these are set as the clamp voltages, the part will turn-off when the voltages on inputs exceed POSFV/NEGFV by 0.7V and the drain will pull to the rail (POSFV or NEGFV) that was exceeded.    

   

Q5. Can these parts be powered off 5V single supply?
A5. No. Guaranteed minimum operation is 8V Single Supply as per datasheet.


Q6. My downstream component states that the inputs cannot exceed Vdd+0.3V, but the ADG5412F only turns off when the voltages on input exceeds Vdd by ~0.7V.  Will this cause an issue in my system?
A6. No. The output of our ADG54xxF parts clamps the OVP to Vdd+0.7V for ~460ns (Overvoltage Response Time, tRESPONSE ), after which time the part has fully turned OFF and output goes open circuit or pulls to Vdd, depending on part.  So for ~460ns period, there will be some current flow but it would be more benign than a 1kV HBM ESD pulse, so this should not cause any issues in the system once the downstream circuit has an ESD rating in excess of 500V HBM. Clamping the signals too close to the rails could trigger false Over-voltages if there is ripple on the power supplies so the 0.7V Vt is good balance for the system.

Q7. What will be the recovery time when switching from a channel in fault to a channel not in fault?
A7. The timing will be the same as normal channel to channel switching; i.e. there is no additional timing to change from a fault channel to a non-fault channel: typically 400ns for Ton on the ADG5404F

Q8. How does an overvoltage on one mux channel affect the operation of the other channels of the ADG5404F multiplexer?
A8. One of the major drawbacks of using series resistors to protect multiplexed inputs is that an over-voltage event on OFF channels injects noise to good ON channel due to current flow in substrate leading to corrupt data. With ADG54xxF parts, there is no current flow in the substrate ensuring no corruption of data.

       However, there will be an increase in the leakage current on the mux output due to a Fault condition.

       For the ADG5404F, the Drain leakage, ID,  for one channel in fault and the other three not is typically 1.2nA @25°C. So this ID fault leakage will add to the leakage specification of a normally ON channel, ID(ON), which is 0.6nA typically.

       IDD will also increase slightly during an over-voltage event, on the ADG5404F from typically 0.9mA to 1.2mA for a +55V fault

Q9. What are the key performance differences between the ADG5412F and the ADG5412BF?
A9. The ADG5412F offers protection on the Sx inputs only. The ADG5412BF offers protection on the Sx inputs and the Dx inputs so is needed in applications that require fault protection on both inputs and outputs.

       Unlike the ADG5412F, the ADG5412BF does not have ESD clamp diodes on the output side, so during an OVP event, until the part turn-off after it detects a fault (450ns typ) the output will track the input.

       Some examples of applications that may require bi-directional OVP are, in ATE systems where faults can occur from Test equipment side or on DUT side of switch or in Switch Matrix Modules where any pin can be an input or an output.

Q10. Are these parts pin-pin compatible with existing parts? For example is the ADG5404F pin-pin compatible with the ADG5404?
A10. The “F” parts are not direct pin-pin replacements with non-F version. The ADG5404F has extra pins (ie the FF, SF and DR pins) that are NC (no connects) on the ADG5404. If these pins are true No Connects on the board then the ADG5404F can be dropped in as a replacement.  However, if the NC pins on the ADG5404 have been hard-wired to VDD/VSS then the part cannot be used as a direct drop-in.

        The FF and SF pins on the ADG5404F are digital output pins and are weak pull-ups (2.5uA if not in use, these pins should be left floating.  If they are grounded 2.5uA will flow from FF to GND but will not damage the part.

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