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Synchronized Pulse Generator With The TCD1304DG MCLK Timing sequence

A project log for DAV5 V3.01 Raman Spectrometer

The only thing worth doing, is the thing worth doing right!

david-h-haffner-srDavid H Haffner Sr 04/23/2017 at 07:440 Comments

While I am waiting for some component parts to arrive this week, I modified my 555 timer pulse generator test circuit to be in sync with the TCD1304's Master clock sequence. I used an L7805CV 5vdc + voltage regulator and 2 well placed ceramic disk capacitors at pins 6 and 3, to smooth out any ringing and keep a lot of the noise down and got the pulses to be quite tame.

I am providing my schematic design and plots, along with the mathematical equations to solve for T1 and T2 timing sequences.

Timing is set at 10ms at a frequency of 470 Hz (due to L1 (470uf fixed induction coil at pin# 3)

The circuit can be further modified to be a mono stable circuit by untying pins 2 and 6, use pin 2 as the triggering incoming pulse and make reset and trigger input (pin# 4,) momentarily low to reset timing cycle, otherwise keep reset at vcc.

Below is the schematic for the circuit in the picture above:

L7805CV voltage regulated Pulse Generator using a 555 Timer

12vdc supply voltage

L7805cv volage regulator

R1 = 100k (trim POT)

R2 = 1K

C1 = 1uf (electrolytic/35v)

C4 = 10pf

C5 = 0.1uf (ceramic/104m)

C2 = 1uf (electrolytic/35v)

C3 = 10uf (electrolytic/35v)

L1 Induction coil (470uf/7.09ohm @ pin# 3)

Solving for Timing sequence of T1 and T2:

T1 = .693(R1+R2)C1

T2 = .693(R2)C1

Frequency = 1.44/(R1+2R2)C1

The plot above was done on processed using Excel

Bill of Materials (BOM)

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