Simple Analog to Digital Converter


Posted on Feb 5, 2014

The simplest Analog to Digital Converter (ADC) can be constructed as shown in Figure 1. Input voltage which can range from zero up to power supply voltage (Vcc) converts to parallel additional binary code at the outputs of the converter. For normal operation of the ADC requires that the inverter-comparators A1-A4 should be able to switch when the


Simple Analog to Digital Converter
Click here to download the full size of the above Circuit.

voltage on their inputs equal to Vcc/2 and an error must be no more than Vcc/(2n-2) (n - number of bits of binary code at output), and the output voltage of the comparator in on/off states should be close to zero and to the Vcc. In addition, the comparator must have a high input and low output impedance. Most of the modern op amps is satisfied for these requirements, the inverting inputs of this op amps should be connected to the Vcc/2 (half of power supply voltage). If the required accuracy of analog to digital conversion does not exceed four bits, then as the basis for the ADC can be used quad CMOS logic elements "NAND" or "NOR". One of the possible approaches to construct this device is shown in Figure 2. The input impedance of this circuit is about 22 kilohms, and the time of conversion - less than 300 ns.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

IR headphone transmitter CD4046
RF Field Strength meter
Solar Panel Voltage Regulator Charger Circuit
led rf signal meter
power Switching Between Two Voltage Supplies
Latching Current Limiter
ultrasonic electrostatic transducer for
car alarm arming horn beep
Ponyprog Circuit for ATMEL AVRs
USB Bootloader
Bicycle Radio easy and cheap to build (April 1940)
Simple and practical human approach detector circuit diagram
AC measuring circuit diagram
Multiplicative -DA converter electronic attenuator



Top