Lab 3 Revisited. Zener diodes IAP 2008 Lecture 4 1
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1 Lab 3 Revisited Zener diodes R C IAP 2008 Lecture 4 1
2 Lab 3 Revisited +15 Voltage regulators 555 timers 270 1N uf 5K pot V+ V- 2N uf V o. V CC V Vin s = 5 V Vc V c Vs 1 e t = RC Threshold Control Voltage Trigger k 5k 5k 1 Gnd + Comp _ A + Comp _ B R S Flip Flop Inhibit/ Reset 4 Reset 7 3 Discharge Output IAP 2008 Lecture 4 Figure by MIT OpenCourseWare. 2
3 Closet Light Timer k reset 10k 555 output R threshold 1N914 trigger discharge 1k 0.1uf control C uf IAP 2008 Lecture 4 3
4 Digital Circuits Real world analog signals have noise unavoidable. Digital circuits offers better noise immunity. Use voltage to represent 0 and 1 Avoid forbidden voltage zone. Make standards tighter for output than for inputs. Data (HCMOS family): 0 (low), 1 (high) Input voltage low: v Input voltage high: >2.0V Output low: <0.4v Output high: >3.98v IAP 2008 Lecture 4 4
5 Digital Circuits +5V HCMOS 1 (high) Output high: >3.98v output high range +3.98V Input voltage high: >2.0V input high range noise margin +2.0V Forbidden Zone HCMOS 0 (low) 0.7V Output low: <0.4v Input voltage low: v noise margin output low range 0.4V input low rage IAP 2008 Lecture 4 5
6 Power Requirements The following power supplies are common for analog and digital circuits: +5v for digital circuits, +15v, -15v for analog, -5v, +12v, -12v also used +3.3 Other voltages generally derived IAP 2008 Lecture 4 6
7 6.091 IAP 2008 Lecture 4 7
8 Boolean Algebra A B = A & B A = Inverse of A A B = Inverse of [A&B] DeMorgan's Law A B = A + B A + B = A & B IAP 2008 Lecture 4 8
9 Digital System Implementation Start with AND, OR, NOR, NAND gates and add more complex building blocks: registers, counters, shift registers, multiplexers. Wire up design. High manufacturing cost, low fix costs. Examples 74LS, 74HC series IC For volume production, move to PALs, FPGAs, ASICs. Low manufacturing cost, high fix costs IAP 2008 Lecture 4 9
10 Basic Gates Circle indicates inversion IAP 2008 Lecture 4 10
11 74LS00 NAND Gate Dual-In-Line Package V CC B4 A4 Y4 B3 A3 Y A1 B1 Y1 A2 B2 Y2 GND This device contains four independent gates each of which performs the logic NAND function. Figure by MIT OpenCourseWare, adapted from the National Semiconductor 54LS00 datasheet IAP 2008 Lecture 4 11
12 74LS02 NOR Gate Dual-In-Line Package V CC Y4 B4 A4 Y3 B3 A Y1 A1 B1 Y2 A2 B2 GND This device contains four independent gates each of which performs the logic NOR function. Figure by MIT OpenCourseWare, adapted from the National Semiconductor 54LS02 datasheet IAP 2008 Lecture 4 12
13 74LS08 AND Gate Dual-In-Line Package VCC B4 A4 Y4 B3 A3 Y A1 B1 Y1 A2 B2 Y2 GND This device contains four independent gates each of which performs the logic AND function. Figure by MIT OpenCourseWare, adapted from the National Semiconductor 54LS08 datasheet IAP 2008 Lecture 4 13
14 74LS Multiplexer Dual-in-line Package Data Inputs Data Select VCC D4 D5 D6 D7 A B C Inputs Select C B A X X X L L L L L H L H L L H H H L L H L H H H L H H H Strobe S H L L L L L L L L Outputs Y L D0 D1 D2 D3 D4 D5 D6 D7 W H D0 D1 D2 D3 D4 D5 D6 D7 D3 D2 D1 D0 Y W Strobe GND H = High Level, L = Low Level, X = Don t Care D0, D1_D7 = Level of the Respective D Input Data Inputs Outputs Figures by MIT OpenCourseWare IAP 2008 Lecture 4 14
15 Building Logic From basic gates, we can build other functions: Exclusive OR Gate X Y Z X Y Z X Y Z IAP 2008 Lecture 4 15
16 74LS86 Exclusive OR V CC Truth Table GND In Out A L L H H B L H L H Z L H H L Figure by MIT OpenCourseWare, based on Motorola datasheet IAP 2008 Lecture 4 16
17 74LS74 D Flip Flop SET-PRESET Note both and bar CLK D SET CLR CLR circle indicates inversion (active low) Reprinted with permission of National Semiconductor Corporation. CLK D IAP 2008 Lecture 4 17
18 Counters Ripple carry Previous stage used to clock next bit; B 1 B CLK D B 0 SET CLR D B 1 SET CLR Synchronous B 0 B 1 Same clock used for each bit D SET D SET CLR CLR Power connections not shown CLK IAP 2008 Lecture 4 18
19 Building a Synchronous Counter All bits clock on the same clock signal. Next count based on current count. B 1 B 0 B 1 Next B 0 B 1 D SET D SET CLK CLR CLR Power connections not shown B 1 Next IAP 2008 Lecture 4 19
20 Shift Register DATA D SET D D SET C D SET B D SET CLR CLR CLR CLR CLK DATA D C B Converts serial data to parallel data or parallel data to serial data. A IAP 2008 Lecture 4 20
21 74LS175 4 Bit Shift Register D SET D SET 74LS D SET Clock and Clear are common for all FF. The D FF will store the state of 7 their individual D inputs on D SET the LOW to HIGH Clock transition, causing the individual and to follow. CLR CLR clock clear CLR CLR A LOW input on the Clear will force all outputs LOW and outputs HIGH independent of Clock or Data inputs IAP 2008 Lecture 4 21
22 Binary Numbers MSB Most Significant Bit LSB Least Significant Bit Let s build an adder: A+B=S where A,B,S are m bits wide: A: A m A m-1 A 1 A 0 Dec Binary Hex Dec Binary Hex A B C D E F IAP 2008 Lecture 4 22
23 Binary Adder m th bit C in A B Sum C out A B C in ADDER C out Sum Sum = C out = IAP 2008 Lecture 4 23
24 Signed Numbers Twos Complement Positive Number: MSB=0 Negative Number: MSB=1 4 Bit example Simple addition & subtraction Most common notation MSB LSB Decimal IAP 2008 Lecture 4 24
25 Propagation Delays All digital logic have propagation delay Typical discrete logic gate propagation delay ~10ns X Z X Z IAP 2008 Lecture 4 25
26 Lab Exercise Ring Oscillator IAP 2008 Lecture 4 26
27 Lab Exercise 4 Bit Counter Logic Analyzer +5 Power connections not shown for 74LS Mhz crystal osc P T LD CLR 74LS163 counter A B C D Attach LA probe A2 to A-D triangle is symbol for clock input IAP 2008 Lecture 4 27
28 Lab Exercise Ramp Generator R R R R V o R 2R 2R 2R 2R +5 B Mhz crystal osc P T LD A B C CLR D 74LS163 counter A B C D B 1 74HC08 B 2 B 3 triangle is symbol for clock input IAP 2008 Lecture 4 28
29 RAMP Generator Output IAP 2008 Lecture 4 29
30 R-2R Theory For linear circuits, superposition applies. Calculate contribute of bit n by setting all other inputs to zero. Equivalent resistance looking left or right is R ohms! Use Thevenin equivalent to show division by 2 n R same as R ohms same as R ohms same as R ohms R R R R 2R 2R 2R 2R +5V V o IAP 2008 Lecture 4 30
31 DA Summary Output from digital to analog conversion are discrete levels. More bits means better resolution. An example of DA conversion Current audio CD s have 16 bit resolution or 65,536 possible output levels New DVD audio samples at 192 khz with 24 bit resolution or 2 24 = 16,777, IAP 2008 Lecture 4 31
32 Analog to Digital Conversion (ADC) Successive approximate conversion steps Scale the input to 0-3 volts (example) Sample and hold the input Internally generate and star case ramp and compare Flash Compare Compare voltage to one of 2 n possible voltage levels. 8 bit ADC would have 255 comparators. Note that by definition, ADC have quantizing errors (number of bits resolution) IAP 2008 Lecture 4 32
33 Successive Approximation AD L14, Fall IAP 2008 Lecture 4 33
34 AD7871 Courtesy of Analog Devices. Used with permission IAP 2008 Lecture 4 34
35 Switch Bounce All mechanical switches have switch bounce +5V Vout IAP 2008 Lecture 4 35
36 Debounce Circuit +5v 1K T 1K +5v bar T B bar SPDT switch B Requires SPDT switch IAP 2008 Lecture 4 36
37 Lab 4 Use last three aisles on the left at the end of the lab Pick up IC s and tools from LA s. Return IC s and tools to LA s at the end of the lab IAP 2008 Lecture 4 37
38 Design, build and keep the electronics for a digital lock. Unlock key based on sequence of 0, 1. Lab IAP 2008 Lecture 4 38
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