Two 8-bit dacs make a 12-bit dac


Posted on Nov 27, 2012

Two MC1408—8-bit D/A converters, A and in the circuit diagram, are used. The four least-significant bits of A are tied to zero. The four most significant bits of the 12-bit data are connected to the remaining four input pins. The eight least significant bits of the 12-bit data are connected to the eight input pins of B. The four most significant bits of the 12-bit data together have a weight of 16 relative to the remaining eight bits. Hence, the output from is reduced by a factor of 16 and summed with the output from A using the summing op-amp configuration D. Voltage regulator chip, LM7236, is used to provide an accurate reference voltage, 2 V, for the MC1408.


Two 8-bit dacs make a 12-bit dac
Click here to download the full size of the above Circuit.

The full-scale voltage of the converter is Vie 9.9609 + 1 (9.375) or 9.9976 V. The step size of the converter is 2.4 mV.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Logic Probe with 74LS47
3 Way Crossover -24dB
Electronic lock using the 4022 octal counter
Long duration timer
Gasoline engine tachometer
Proximity Detector
Automatic Inverter Supply and Mains Supply Changeover Relay
remote control using the ne 555 and lm 567
Nonlinear Oscillator
fan control
Thrifty 2Hz Clock
Analog IO Protection
matrix keypad interfacing with spartan 3 primer
Sine Signal Generating
Frequency Modulated Sound Card Capture
Two Interlocked Toggle Switches - Cmos 4013



Top