4-to-16 Decoder IC

MM74HC154

New product of fairchild semoconductor
The MM74HC154 decoder utilizes advanced silicon-gate
CMOS technology, and is well suited to memory address
decoding or data routing applications. It possesses high
noise immunity, and low power consumption of CMOS with
speeds similar to low power Schottky TTL circuits.


The MM74HC154 have 4 binary select inputs (A, B, C, and
D). If the device is enabled these inputs determine which
one of the 16 normally HIGH outputs will go LOW. Two
active LOW enables (G1 and G2) are provided to ease
cascading of decoders with little or no external logic.

74HC154 datasheet pdf

12-Bit A/D Converter

MCP3202
12-Bit A/D Converter with SPI® Serial Interface
The Microchip Technology Inc. MCP3202 is a successive
approximation 12-bit Analog-to-Digital (A/D) Converter
with on-board sample and hold circuitry. The
MCP3202 is programmable to provide a single
pseudo-differential input pair or dual single-ended
inputs.

FEATURES
• 12-bit resolution
• ±1 LSB max DNL
• ±1 LSB max INL (MCP3202-B)
• ±2 LSB max INL (MCP3202-C)
• Analog inputs programmable as single-ended or
pseudo-differential pairs
• On-chip sample and hold
• SPI® serial interface (modes 0,0 and 1,1)
• Single supply operation: 2.7V - 5.5V
• 100ksps max. sampling rate at VDD = 5V
• 50ksps max. sampling rate at VDD = 2.7V
• Low power CMOS technology
- 500nA typical standby current, 5μA max.
- 550μA max. active current at 5V
• Industrial temp range: -40°C to +85°C
• 8-pin PDIP SOIC and TSSOP packages

MCP3202 Datasheet pdf

SPI - Serial Peripheral Interface
The Serial Peripheral Interface (SPI) is used primarily for a
synchronous serial communication of host processor and
peripherals. However, a connection of two processors via SPI
is just as well possible and is described at the end of the chapter.

C Compiler Reference Manual
Example C program interface MCP3202 to microcontroller
MCP3208.C A/D converter functions

7-segment display circuit

Circuit use SIPO ( CD4094 ) for control segment A to segment H
of 7-segment and use DECADE COUNTER ( CD4017 ) for scan
enable 7-segment (7- segment common cathode )


Timing chart of CD4017

4017 datasheet pdf

4094 datasheet pdf

Transient Suppressor Diode

The overvoltage transient suppressor diode is designed for
Applications requiring a diode with reverse avalanche
characteristics for use as reverse power transient suppressor.

MR2835SK Transient Suppressor Diode datasheet


How To Select Transient Voltage Suppressors
There are important Transient Voltage Suppressor (TVS)
datasheet characteristics and ratings that require careful
comparisons to circuitcomponent limitations and
transientconditions before selecting the optimum component.

///////////////////////////////////////////////////////////////////////////////////
Transient Suppressor Diode Application

Application Note Of Transient Voltage Suppression
Transient Voltage Suppression (TVS) protection devices
such as shielded cables, crowbars, filters and clamping
devices have been widely used for a number of years to solve
EMI problems. These TVS devices can be used to achieve
higher EMI higher immunity levels without significantly
adding to the cost and complexity of the circuit.

Power Filter 12V Voltage Regulator Circuit
At input side of regulator, I inserted a series inductor in addition
to normal decoupling capacitor to form a LC filter, so that it can
resist transient voltage. If supply voltage temporary goes up,
it can be absorbed by regulator.


The application of relay coil suppression with DC relays
This application note has been written in response to the
Numerous application problems resulting from improper relay
coil suppression.