How to understand schematic symbols of MSP430

[Jasper Chow]

I' am going through the user's guide of TI's MCU MSP430, but I can't fully understand many schematics of its function blocks. The most challenge is the electronic symbols in the datasheet. There are many uncommon circuit symbols in the datasheet, and they are given without further specification. These symbols can hardly be found in textbook or online. For instance, here is an analog multiplexer block diagram
What does the circled symbol stand for? Any one who can tell me what I should do？

 

[KlausST]

Hi,

In hydraulics this means a valve.
In electonics see it as a voltage controlled switch.

Klaus

 

[Jasper Chow]

Hi,

In hydraulics this means a valve.
In electonics see it as a voltage controlled switch.

Klaus

Could it be a transmission gate?

 

[Audioguru]

Could it be a transmission gate?

Yes, a transmission gate is a voltage-controlled switch.

 

[Gorgon]

This drawing is just showing a part of the analogue multiplexer. If you had read the text around the drawing you would have seen the following:

'The input multiplexer is also a
T-switch to minimize the coupling between channels. Channels that are not
selected are isolated from the A/D and the intermediate node is connected to
analog ground (AVSS) so that the stray capacitance is grounded to help
eliminate crosstalk.'

And yes, the 'valves' are analogue switches.