Saturday, June 23, 2018

CD4060 Binary Counter Divider Oscillator

The CD4020BC, CD4060BC are 14-stage ripple carry binary counters, and the CD4040BC is a 12-stage ripple carry binary counter. The counters are advanced one count on the negative transition of each clock pulse. The counters are reset to the zero state by a logical "1" at the reset input independent of clock.

CD4060 Binary Counter Divider Oscillator

CD4040BC, 12-Stage Ripple Carry Binary Counters
CD4060BC, 14-Stage Ripple Carry Binary Counters

CD4060 - 14-Stage Ripple Carry Binary Counters
you can also use a crystal between pin 10 and 11 with two caps 22pF from 10, 11 to gnd and a 10M resistor between 10 and 11 in place of R C network for more precision.

Tuesday, June 12, 2018

ADuCM360 - Precision Analog Microcontroller

ADuCM360 is a Low power precision analog microcontroller, ARM cortex M3 with dual sigma-delta ADCs. There is an Application note and Evaluation Kit from Analog Devices. This solutions helps you evaluate a part of a Process Control or Data Acquisition module that you may wish to design.

"In the circuit, the ADuCM360 is connected to a Type T thermocouple and a 100 Ω platinum resistance temperature detector (RTD). The RTD is used for cold junction compensation. The low power Cortex-M3 core converts the ADC readings to a real temperature value. The Type T temperature range supported is −200°C to +350°C, and this temperature range is converted to an output current range of 4 mA to 20 mA."

12-Bit, 4-20mA Loop-Powered Thermocouple Measurement System

12-Bit, 4-20mA Loop-Powered System

The thermocouple used in this application is a Type T (copper-constantan) that has a temperature range of −200°C to +350°C. Its sensitivity is approximately 40 μV/°C, which means that the ADC in bipolar mode, with a PGA gain of 32, can cover the entire temperature range of the thermocouple.

The RTD was used for cold junction compensation. The particular one used in this circuit was a platinum 100 Ω RTD, Enercorp PCS 1.1503.1. It is available in a 0805, surface-mount package. This RTD has a temperature variation of 0.385 Ω/°C.

Saturday, June 09, 2018

LM3914 - Dot Bar Display Driver

The LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 10 LEDs, providing a linear analog display. A single pin changes the display from a moving dot to a bar graph. Current drive to the LEDs is regulated and programmable, eliminating the need for resistors. This feature is one that allows operation of the whole system from less than 3V.

LM3914 - Versatile and Easy use Display
  • Drives LEDs, LCDs or vacuum fluorescents
  • Bar or dot display mode externally selectable by user
  • Expandable to displays of 100 steps
  • Internal voltage reference from 1.2V to 12V
  • Operates with single supply of less than 3V
  • LED driver outputs are current regulated, open-collectors

LM3914 - Dot/Bar Display Driver

The circuit contains its own adjustable reference and accurate 10-step voltage divider. The low-bias-current input buffer accepts signals down to ground, or V-, yet needs no protection against inputs of 35V above or below ground. The buffer drives 10 individual comparators referenced to the precision divider. Indication non-linearity can thus be held typically to ½%, even over a wide temperature range.

Millivolt Meter using a LM3914 LED Dot Display

Millivolt Meter using a LM3914 LED Dot Display

More Reading

Tuesday, May 22, 2018

LF398 - Monolithic Sample and Hold Circuit

The LF198/LF298/LF398  are monolithic sample-and-hold circuits which utilize BI-FET technology to obtain ultra-high dc accuracy with fast acquisition of signal and low droop rate.

LF398 - Monolithic Sample and Hold Circuit

Operating as a unity gain follower, dc gain accuracy is 0.002% typical and acquisition time is as low as 6 µs to 0.01%. A bipolar input stage is used to achieve low offset voltage and wide bandwidth. Input offset adjust is accomplished with a single pin, and does not degrade input offset drift.

LF398 - Monolithic Sample and Hold Circuit

The wide bandwidth allows the LF198 to be included inside the feedback loop of 1 MHz op amps without having stability problems. Input impedance of 1010Ohm allows high source impedances to be used without degrading accuracy.

P-channel junction FET's are combined with bipolar devices in the output amplifier to give droop rates as low as 5 mV/min with a 1 µF hold capacitor. The JFET's have much lower noise than MOS devices used in previous designs and do not exhibit high temperature instabilities. The overall design guarantees no feed-through from input to output in the hold mode, even for input signals equal to the supply voltages.

Monday, May 21, 2018

LM2575 - Buck Adjustable Switching Regulator

"The buck-boost regulator circuit delivers -5V output. I hoped this would a nice way to generate a negative voltage for e.g. an LCD-display. However this circuit requires component values that are similar to the buck regulator at high load."

The TI Datasheet Layout Guidelines

LM2575 Switching Regulator
LM2575 - Step-Down Adjustable Voltage Switching Regulator with Output Enable

The LM2575 represents a superior alternative to  popular three-terminal linear regulators. Due to its
high efficiency, it significantly reduces the size of the heat sink.

The device also offers internal frequency compensation, a fixed-frequency oscillator, cycle-by-cycle current limiting, and thermal shutdown.

Saturday, May 19, 2018

LM723 Power Electronics Workhorse

This is another versatile and flexible chip. I could design current sources, voltage to current transmitters, level translation and many more. You can think of applications beyond the Power Electronics Scope with this.

LM723 Power Electronics Workhorse

"The circuit provides internal current limiting. When the output current exceeds 150mA an external NPN or PNP pass element may be used. Provisions are made for adjustable current limiting and remote shutdown."

LM723 Power Electronics Workhorse

The LM723/LM723C is also useful in a wide range of other applications such as a shunt regulator, a current regulator or a temperature controller

Some Specs -

Input voltage up to 40V, Output voltage adjustable from 2 to 37V, Output current to 150mA without external pass transistor and Adjustable current limiting.

Friday, March 23, 2018

STMicroelectronics - Industrial and Automotive Semiconductors

STMicroelectronics was created in 1987 by the merger of SGS Microelettronica of Italy and Thomson Semiconducteurs of France. It is well know to engineers for very reliable and robust Power Devices and Integrated Circuits from Analog and Mixed-Power Signal to Embedded Devices.

STMicroelectronics - Industrial and Automotive Semiconductors

Segments include semiconductors for industrial applications, MEMS (Micro-Electro-Mechanical Systems), Sensors and chips for wireless and mobile applications. IC Interface and Management Solutions that are part of computing and embedded Systems.
  • Transistors, Analog & Mixed Signal ICs
  • EMI Filtering & Conditioning
  • Automotive Devices and Systems.
  • Microcontrollers, ARM, ASIC
  • Power Devices and Motor Control
  • Thyristors & ACSwitches and Motor Control
EVAL6235PD demonstration board

EVAL6235PD demonstration board

Fully integrated DMOS three-phase brushless DC motor driver. Used in conjunction with the EVALPRACTISPIN interface board and practiSPIN software, the board provides an evaluation platform to test the features of the L6235 device. In particular, the board provides a means to evaluate the power dissipation performance of the IC in the PowerSO package.

Thursday, March 22, 2018

LM311 - Fast Low Power Voltage Comparator

The LM111, LM211 and LM311 are voltage comparators that have input currents nearly a thousand times lower than devices like the LM106 or LM710. They are also designed to operate over a wider range of supply voltages: from standard ±15V op amp supplies down to the single 5V supply used for IC logic.

LM311 - Fast Low Power Voltage Comparator

LM311 - Voltage Comparator

Both the inputs and the outputs of the LM111, LM211 or the LM311 can be isolated from system ground, and the output can drive loads referred to ground, the positive supply or the negative supply. Offset balancing and strobe capability are provided and outputs can be wire ORed.
  • Operates from single 5V supply
  • Input current: 150 nA max. over temperature
  • Offset current: 20 nA max. over temperature
  • Differential input voltage range: ±30V
  • Power consumption: 135 mW at ±15V
LM311 Square Triangle Oscillator for PWM

LM311 is a comparator, It operates from single 5V supply or dual supplies,input current 150 nA, 50 V-50 mA output drive capability. TTL-CMOS compatible output.

Wednesday, March 21, 2018


These devices consist of four independent voltage comparators that are designed to operate from a single power supply over a wide range of voltages. Operation from dual supplies also is possible, as long as the difference between the two supplies is 2 V to 36 V, and VCC is at least 1.5 V more positive than the input common-mode voltage.

Quad General Purpose Differential Comparator - LM339

An application from an old TI datasheet showing the versatility of this comparator. For me it was a workhorse and like LM324 was used in many products.

Quad General Purpose Differential Comparator - LM339
Current drain is independent of the supply voltage. The outputs can be connected to other open-collector outputs to achieve wired-AND relationships.

Differential to TTL convertor using LM339
  • Single Supply or Dual Supplies
  • Wide Range of Supply Voltage:
  • Low Supply-Current Drain Independent of Supply Voltage... 0.8 mA Typ
  • Low Input Bias Current ...25 nA Typ
  • Low Input Offset Voltage . . . 2 mV Typ
  • Common-Mode Input Voltage Range Includes Ground
  • Differential Input Voltage Range Equal to Maximum-Rated Supply Voltage . . . ±36 V
  • Low Output Saturation Voltage
  • Output Compatible With TTL, MOS, and CMOS

Tuesday, February 27, 2018

BD139 and BD140 Complementary Transistors

This pair is my favorite when driving small solenoids or motors. SOT-32 and 12 Watts on Heatsink. This means any small solenoid, relay or DC motor can be controlled with this. I would use it upto 24V DC and max of 1A for applications of full on and full off.

BD139 and  BD140 Complementary transistor

BD139  NPN Silicon Transistor

"The NPN types are the BD135 and BD139, and the complementary PNP types are the BD136 and BD140." -  - - BD139 - NPN, 80V and 1.5A, 40 beta min.

BD140 PNP Silicon Transistor

"They are designed for audio amplifiers and drivers utilizing complementary or quasi-complementary circuits." - - - BD140 - PNP, 80V and 1.5A, 40 beta min.

Monday, February 26, 2018

Linear Technology - Analog and Interface Solutions

They have unique Interface products that make blending the real world analog and the digital electronics that makes embedded computing possible.

They have Solutions in power management, data conversion, signal conditioning, wireless and circuit and device interface.

Linear Technology - Analog and Interface Solutions

Some Special Products include - SmartMesh WirelessHART, Signal Chain µModule Receivers, Supercapacitor Chargers, Optical Communications and µModule LED Drivers.

Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products  include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, and many other analog functions.

SmartMesh WirelessHART RF Certified Starter Kit

The DC9022 SmartMesh WirelessHART RF Certified Starter Kit provides all the tools for evaluating SmartMesh network performance for your application needs, including high reliability, ultralow power, scalability and ease of installation. This accelerates device integration and application development.

The DC9018A-C Evaluation/Development Mote Modules feature easy-to-probe signal pins. In addition, the starter kit provides access to both manager and mote software application programming interfaces (APIs) to enable application software development.

Linear Technology
1630 McCarthy Blvd. Milpitas, CA  95035-7417, USA.

Saturday, February 24, 2018

SG3525 - PWM SMPS Regulator Chip

SG2525 - SG3525 - PWM SMPS Regulator Chip. A second generation ic switch mode controller optimized for high frequency.

SG3525 - Voltage Mode PWM

The SG3525A pulse width modulator control circuit offers improved performance and lower external parts count when implemented for controlling all types of switching power supplies. The on-chip +5.1 V reference is trimmed to +/-1% and the error amplifier has an input common-mode voltage range that includes the reference voltage, thus eliminating the need for external divider resistors. Half Bridge, Push-Pull.

SG2525 - SG3525 - PWM SMPS Regulator Chip

  • 8.0 V to 35 V Operation
  • 5.1 V +/- 1.0% Trimmed Reference
  • 100 Hz to 400 kHz Oscillator Range
  • Separate Oscillator Sync Pin
  • Adjustable Deadtime Control
  • Input Undervoltage Lockout
  • Latching PWM to Prevent Multiple Pulses
  • Pulse-by-Pulse Shutdown
  • Dual Source/Sink Outputs: +/- 400 mA Peak

100kHz Half Bridge Convertor - SG3525

This is a SMPS Circuit improved over the Application Note in the book SGS Motion Control Application Manual. This worked well. It helps you learn more about High Frequency Power Supply Design.

SG3525 usage in SMPS 500W - It was used in Parallel for Electroplating with a central Load sharing control between modules.

Circuits -

Wednesday, January 24, 2018

ICL7107 DPM and DVM chip from Intersil

The Intersil ICL7106 and ICL7107 are high performance, low power, 31/2 digit A/D converters. Included are seven segment decoders, display drivers, a reference, and a clock.

The ICL7106 is designed to interface with a liquid crystal display (LCD) and includes a multiplexed backplane drive; the ICL7107 will directly drive an instrument size light emitting diode (LED) display.

ICL7107 DPM and DVM chip from Intersil

ICL7107 DPM and DVM chip from Intersil
  • Guaranteed Zero Reading for 0V Input on All Scales
  • True Polarity at Zero for Precise Null Detection
  • 1pA Typical Input Current
  • True Differential Input and Reference, Direct Display Drive
  • LCD ICL7106, LED lCL7107
  • Low Power Dissipation - Typically Less Than 10mW
ICL7109 12-Bit A/D Converter with 3-State Binary Outputs

This is one of the first mixed CMOS IC, I used it after studying Intersil CMOS Hot Ideas Book. It is also the most widely used Display chip. Many Millions of Instruments are built using this chip both in Instrumentation and Industrial Automation.

The ICL7106 was most popular in Hand Held DMM's and Clamp Meters as it used to drive a LCD Display. ICL7109 was to interface with Digital Comparators and Microprocessors.

Wednesday, January 17, 2018

ICL7135 A to D converter with BCD Output

The Intersil ICL7135 precision A/D converter, with its multiplexed BCD output and digit drivers, combines dual-slope conversion reliability with ±1 in 20,000 count accuracy and is ideally suited for the visual display DVM/DPM market. The 2.0000V full scale capability, auto-zero, and auto-polarity are combined with true ratiometric operation, almost ideal differential linearity and true differential input. All necessary active devices are contained on a single CMOS lC, with the exception of display drivers, reference, and a clock.

ICL7135 4 and Half A to D converter with BCD Output

ICL7135 Device Information

It features auto-zero to less than 10µV, zero drift of less than 1µV/oC, input bias current of 10pA (Max), and rollover error of less than one count.

Thursday, January 11, 2018

GLOBALFOUNDRIES - Semiconductor Manufacturing Fab

The company is distributed over three continents. It has three 300mm fabs and five 200mm fabs. The major facilities for research, development and design enablement located near hubs of semiconductor activity in the United States,

GLOBALFOUNDRIES - Semiconductor Manufacturing Fab

GlobalFoundries was created by the divestiture of the manufacturing fab of AMD and later it enhanced its global presence after the merger with Chartered Semiconductor.

"Manufacturing centers in Germany, the United States and Singapore deliver advanced technologies to market in high volume..."

Assured long term supply and innovation of 200mm technologies with scalable plug-in modules such as analog/RF, High Voltage and embedded memories.

Analog Design  22FDX 22nm

Analog Design Workshop for 22FDX 22nm FD-SOI Technology

Learn analog design and layout best practices in 22FDX 22nm FD-SOI process technology in this two-part workshop. Part one—design, Part two—layout.

840 N McCarthy Blvd Milpitas, CA 95035, USA

Popular Posts

Search This Blog