need simple sample and hold chip

[[email protected]]

I'm looking for the switch or gate for a sample and hold.
requirements: +/- 5V input , TTL control referenced to analog ground,
dip or soic package. 4066 or 4053 need not apply. bandwidth is 20
khz and sampling rate is undersampling,ie 100 to 500 hz.

any candidates?

thanks, Steve Roberts

 

[whit3rd]

I'm looking for the switch or gate for a sample and hold.
requirements: +/- 5V input , TTL control referenced to analog ground,
dip or soic package. 4066 or 4053 need not apply. bandwidth is 20
khz and sampling rate is undersampling,ie 100 to 500 hz.

One possibility is a programmable-current (transconductance)
op amp. LM13700 has two sections, first section can be
the follower, second can be the buffer, stick a capacitor
in between (or onto the buffer negative feedback) and
just gate the program current on the follower to HOLD.

Integrated solutions include LF398 (but it seems like overkill here).

 

[John Larkin]

I'm looking for the switch or gate for a sample and hold.
requirements: +/- 5V input , TTL control referenced to analog ground,
dip or soic package. 4066 or 4053 need not apply. bandwidth is 20
khz and sampling rate is undersampling,ie 100 to 500 hz.

any candidates?

thanks, Steve Roberts

Why not 4066 or HC version?

John

 

[John O'Flaherty]

I'm looking for the switch or gate for a sample and hold.
requirements: +/- 5V input , TTL control referenced to analog ground,
dip or soic package. 4066 or 4053 need not apply. bandwidth is 20
khz and sampling rate is undersampling,ie 100 to 500 hz.

Maxim has appnote 638, showing specs of analog switches. Lots of them
are for +/- supply with separate logic ground.

http://www.maxim-ic.com/appnotes.cfm/appnote_number/638
Selecting the Right CMOS Analog Switch - Maxim/Dallas

 

[MooseFET]

I'm looking for the switch or gate for a sample and hold.
requirements: +/- 5V input , TTL control referenced to analog ground,
dip or soic package. 4066 or 4053 need not apply. bandwidth is 20
khz and sampling rate is undersampling,ie 100 to 500 hz.

any candidates?

The DG411/412/413 are ok parts. You didn't state why you can't use
the 405x parts.


The DGxxx parts are analog switches they started out IIRC as Siliconix
parts. Today many people make them. If you google on: DG411
Datasheet
You are likely to find the makers. Vishay would be the most likely
source today. IIRC Maxim has published a datasheet for them so they
may also make them.

 

[Mark Zenier]

I'm looking for the switch or gate for a sample and hold.
requirements: +/- 5V input , TTL control referenced to analog ground,
dip or soic package. 4066 or 4053 need not apply. bandwidth is 20
khz and sampling rate is undersampling,ie 100 to 500 hz.

any candidates?

thanks, Steve Roberts

LF398 ?

Mark Zenier [email protected]
Googleproofaddress(account:mzenier provider:eskimo domain:com)