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Problem description with ADG511 switch
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Hi, I have uploaded a file 'Test_switch_ADG511.zip' in 'Files/Temp/' containing problem description with LTSpice simulation for an ADG511 switch. The switch is not behaving the way it is supposed to. More details can be found inside the zip folder in 'Notes.txt' file. I would appreciate if someone takes a look at it. Thanks Naim |
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Hello Naim, Hello Naim, I have checked your uploaded netlist. This
model requires a logic supply voltage VL (pin 12) connected to Vdd. It's a mistake from ADI when they made this
subcircuit. This pin is NC on the real IC. Especially older analog-switch ICs
required? this VL for the internal logic circuit of the IC, but not ADG511, ADG512, ADG513. Required change of X1 X1 IN1 D1 S1 Vss 0 0 0 0 0 0 0 Vdd Vdd 0 0 0 ADG511¡À5 ; using switch 1 only, VL connected! The ADG511 switches will be on, if IN1 is 0V. If you want it in on-state, then set Vin1 to 0. Vin1 IN1 0 0.0 Rser=.2 Cpar=1p??? ??? ; control pin, 0 V => on, 5 V => off I have uploaded a schematic example using the symbol DIP16, because a schematic is much easier to understand the circuit. ADG511_test.zip Just unzip this file anywhere. You can then immediately simulate my example. Please
report this "wrong" pin VL in the interface of the model of
ADG511DS.CIR to ADI. They may have made the same mistake with all
variants of ADG511, ADG512 and ADG513. The email address is below. LTspice@... Best regards, Helmut Excerpt from the subcircuit. Watch VL(pin 12). Pin-12 used in the subcircuit. * Node assignments *????????????????? IN1 *????????????????? | D1 *????????????????? | | S1 *????????????????? | | | VSS *????????????????? | | | | GND *????????????????? | | | | | S4 *????????????????? | | | | | | D4 *????????????????? | | | | | | | IN4 *????????????????? | | | | | | | | IN3 *????????????????? | | | | | | | | | D3 *????????????????? | | | | | | | | | |? S3 *????????????????? | | | | | | | | | |? |? VL *????????????????? | | | | | | | | | |? |? |? VDD *????????????????? | | | | | | | | | |? |? |? |? S2 *????????????????? | | | | | | | | | |? |? |? |? |? D2 *????????????????? | | | | | | | | | |? |? |? |? |? |? IN2 *????????????????? | | | | | | | | | |? |? |? |? |? |? | .SUBCKT ADG511¡À5?? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 |
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Hi Helmut, Thanks a lot for pointing out the issue and the schematic example. I could never find it out by myself. As a newbie, I was having issues converting the subcircuit to a symbol too. Also thanks for the GNUplot script, which I don't know how to use at this point but will dig into it definitely. From the subcircuit description of the switch, I could feel something fishy is going on with pin 12, so I connected it to GND once but no luck. I'm glad I didn't solve it myself otherwise I wouldn't find this group out. Such an active community full of experts! Thanks again. I'll reach out if I have any issue in future for sure. Naim P.S. You're correct that they've made the same mistake in all the variants of the switches. I'll inform ADI about that.
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Hi Helmut, I see. Now I'm getting how the plots appear automatically. It's helpful. Thanks for clearing that up. Thanks Naim
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