One comment on the parallel AC gate approach. It may not be directly
applicable to Martyn's issue, but there is a common confusion about the
value of the summing resistors.
Per Tom Clark, who came up with the idea, they are *not* intended to
provide a near-end line termination to 50 ohms,
5V into 50 Ohms means 100 mA. Perhaps you need a medium power transistor
amplifier or opamp.
Bob
On Wednesday, March 4, 2015 6:09 AM, Martyn Smith mar...@ptsyst.com
wrote:
Hello,
A quick question.
My output driver for a simple amplifier.
I use three gates (in parallel with
Building on top of John's comments, if you are using a logic gate, look at
the
maximum output (pull up) current per pin, set the series resistor so that
this
current is not exceeded into a short, then also see if there is a maximum
total
current draw for all gates combined, or some power input
Martyn -- the 74AC spec allows Vcc to go up to 6.0 VDC (absolute max is 7.0
VDC) so that might help you meet your 4.5 VDC goal, especially if this is for
play and not a product. Pick the resistors and use more than 3 gates if
necessary. Note the peak current spec is 50 mA per gate. Not sure
Hi,
I've not seen any mention of anything other than the TDC1000.
I was a bit surprised that they went down the less-integrated route
and separated the TDC, but it turns out that for a lot of the sort of
things they designed it for, a uC provides good enough timing itself,
and no extra TDC is
Hi,
Correct me if I'm wrong but being that AC series gates are MOS devices,
isn't there inherent current limiting in the MOS junction itself? I
would think that for the few nanoseconds of skew across gates the tens
of ohms of junction resistance would make 'shoot through' negligible in
terms
The code is in C and Silabs has small dev kits (Toolsticks) that cost $10 to
which you need to add $18 for the programming dongle. A little more expensive
than an Arduino, or less, depending on where you buy it...
To that you need to add a MAX232 (or two serial-TTL adapters at $4 each or so
on
Hi
If you want to drive out of a 50 ohm source into your 50 ohm load *and*
get 5V into the load … that’s a fancy amp. 10V power and some careful
work to get it going.
If you just want to get roughly 5V into a 50 ohm load, then it’s a matter of
how
many gates you decide to parallel. If you go
j...@febo.com said:
Per Tom Clark, who came up with the idea, they are *not* intended to
provide a near-end line termination to 50 ohms, but are simply there to
protect the paralleled devices if the gates have slightly different delays
(in which case one gate could end up sinking the other
Is [one gate sourcing or sinking current into paralleled gates that
don't switch at
exactly the same time] a real problem? How far off can the prop
delay be for 2
gates on the same chip?
I seem to remember reading something saying it was OK to just wire them up in
parallel. It could have
In message blu170-w50577ecf0b24fa2bcefc50ce...@phx.gbl, Mark Sims writes:
Sparkfun is selling a board (around $15) based on the STM VL6180
chip that measures distance based upon time-of-flight of pulses
from an on chip (or at least in-package) VCSEL IR laser. Claims
to have a range of
Hello,
A quick question.
My output driver for a simple amplifier.
I use three gates (in parallel with resistors) from a 74AC14 to give me about
0-3.2V into 50 ohm.
I want to have a driver that gives me a full 0-5V (at least 0-4.5V) swing into
50 ohms.
Can anyone recommend an IC that can
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