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Analog Switch Recommendation

I'm looking for an analog switch, actually only P-channel (to +VCC) needed, runs on 2.7V-3.3V, around 6 ohms on, < 8pF off.

Suggestions?

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

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Reply to
Jim Thompson
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I'm looking for an analog switch, actually only P-channel (to +VCC)

>needed, runs on 2.7V-3.3V, around 6 ohms on, < 8pF off. > >Suggestions? > > ...Jim Thompson

Do you mean just a p-channel low-threshold fet?

John

Reply to
John Larkin

Yep. But meeting my spec?

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

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| 1962 | America: Land of the Free, Because of the Brave

Reply to
Jim Thompson

Well, you can search the usual suspects: Fairchild, Zetex, IR, On.

But maybe take a look at the NEC solid-state relays. Some of them have numbers like 4 ohms on, 1.1 pF off.

John

Reply to
John Larkin

Not too far off..

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13ohms at 2.7V 7pF

Best regards, Spehro Pefhany

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"it\'s the network..."                          "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
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Reply to
Spehro Pefhany

Which makes the NEC ssr's all that more remarkable.

I guess the FOM is Co*Ron, which is 91 ps for the fet, 4.4 ps for the SSR.

John

Reply to
John Larkin

I am afraid that is at least a factor of two on the other side of dream land. 6ohm devices are usually around 15pF (I assume you mean Cds) and even then 3V drive is borderline. Most won't be guaranteed below 4.5V.

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Regards, Joerg

http://www.analogconsultants.com/
Reply to
Joerg

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