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Power Management
Power Management
Documents Powering Analog circuit through SMPS.
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  • +Documents
  • 1/f noise of the ADM7150/ADM7151 be reduced?
  • ADIsimPE Powering Dual Supplies Precision ADCs
  • ADIsimPE support
  • ADIsimPower Design Tools Download
  • ADIsimPower user guide 832
  • ADIsimPower user guide 842
  • Adjustable vs. fixed voltage option
  • ADM1030: Lowest pull resistor
  • ADM1030: Lowest pull up resistor
  • ADM1031: Unused D+ and D+ pins
  • ADM1060 Power Sequencer support for USB interface
  • ADM1062: ADC readback mode
  • ADM1062: Data storage on EEPROM
  • ADM1066 AUX Signals in the State Machine
  • ADM1066: application questions
  • ADM1068: internal Reference maximum current
  • ADM1085: transistor count
  • ADM1166 - CRC, configuration, EEPROM and RAM at startup query
  • ADM1166 Sequencing differential voltage query  (SR#: 1239446)
  • ADM1171: Current limit device
  • ADM1175_Vbus spec
  • ADM1232: Spikes on VCC
  • ADM1816: Voltage on reset line does not go to zero until the supply is approx 1V
  • ADM2483_ESD AB impedance
  • ADM2483_PV pin function
  • ADM2484 revA board
  • ADM2484E voltage specification
  • ADM2485 VDD2 voltage
  • ADM2587 layout to pass EMI/EMC tests
  • ADM2587E isolation ratings
  • ADM2587E max allowable voltages on RS485 pins
  • ADM2587E power consumption
  • ADM2587E Power consumption (1)
  • ADM2682E start up currents
  • ADM2682E/ADM2687E Creepage and Clearance
  • ADM2682E/ADM2687E Isolation Voltage
  • ADM2682E/ADM2687E providing additional current to external devices
  • ADM2682E/ADM2687E Recommended Application Notes
  • ADM2687E: Minimum and Maximum Viso specifications
  • ADM2687E: Power consumption while dissabled
  • ADM3053 max current on Visoout
  • ADM3053 Round Trip Propogation Delay
  • ADM3053 stitching capacitance
  • ADM3053/3053/3054 Isolated CAN Transceiver
  • ADM305x differences
  • ADM3075EARZ: What's its impedance when no supply is applied?
  • ADM3202 alternatve with swapped CMOS/RS-232 pins?
  • ADM3251 heat generation
  • ADM3251E - Prevent - minimize EMI isses
  • ADM3251E: Gerber file EVAL-ADM3251EEBZ
  • ADM3251_application high working temperature
  • ADM3252: Detecting the cable connection
  • ADM3491: Is resistor Rt needed between Y and Z (transmitter side) or only on the receiver side?
  • ADM4073T: Settling Time
  • ADM483E: Operation in fail safe mode
  • ADM485 - how does the fail-safe feature mentioned in the datasheet work
  • ADM6320CX and WDI query/comments(SR#: 1200246)
  • ADM696: Datasheet reset assertion guarantee
  • ADM706: IBIS model
  • ADM706: what happens if WDI Pin is left open or "High Impedance"
  • ADM706: What is the difference between difference ADM706PARZ and ADM706RARZ?
  • ADM709RAR_theta JA & theta JC
  • ADM7154, ADM7155: Are there any other design considerations for low noise?
  • ADM7154, ADM7155: Is the soft start time programmable?
  • ADM7154, ADM7155: What is the recommended headroom voltage?
  • ADM869L: absolute maximum ratings
  • ADP-I2C-USB _USB to I2C Interface Connector
  • ADP1046 Daughter Board compatible with existing one for ADP1043
  • ADP1048 - is is possible to use the ADP1048 with higher input frequencies?
  • ADP1048: Which control mode is used: continous current or  discontinuous current?
  • ADP1051: EEPROM programming procedure
  • ADP125 and ESR values
  • ADP130: Does the datasheet undervoltage lockout spec apply to Vin or Vbias?
  • ADP160-IGND Max
  • ADP1607 reverse current protection with EN high/low
  • ADP1607 to supply ADAU1761
  • ADP1621 and ADP2300/01: positive to negative conversion
  • ADP1829 Dual buck controller with a high side N channel FET
  • ADP197:
  • ADP198  What happens when Vout > Vin ?
  • ADP2108 layout considerations (high frequency switching regulator layout considerations)
  • ADP2118: fixed Output FB Pin
  • ADP2384, ADP2386 - Benefits of hiccup mode during over current/short circuit
  • ADP2384, ADP2386 - Deglitch time when PGOOD reversing
  • ADP2384, ADP2386 - Fastest soft start time
  • ADP2384, ADP2386 - Leaving RT pin open
  • ADP2384, ADP2386 - PGOOD feature
  • ADP2384, ADP2386 - PGOOD pin open
  • ADP2384, ADP2386 - Programming soft start time
  • ADP2384, ADP2386 - Setting the switching frequency
  • ADP2384, ADP2386 - SS pin unconnected
  • ADP2384, ADP2386 - Treatment of GND-EP (pin 25) and SW-EP (pin 26)
  • ADP2384, ADP2386 - Use of EN threshold to set input voltage UVLO
  • ADP2386, ADP2384 - Support of pre-charge start up
  • ADP2441 External Diode between SW and PGND
  • ADP2441 Floating Pins
  • ADP2441 Minimum ON Time
  • ADP2441 Peak Current Limit
  • ADP2441 Precharge Startup
  • ADP2441 VCC Pin
  • ADP2441: Factors to Improve Efficiency
  • ADP2441ACPZ-R7 Power Dissipation
  • ADP2504  Issues with supplied current and current limiting
  • ADP3040 - information available?
  • ADP3302: Input protection
  • ADP3330: max reverse voltage
  • ADP3330: Reverse current
  • ADP3338: Thermal and overcurrent protections
  • ADP5046 shuts down
  • ADP5050 considerations for simulations under Simplis
  • ADP5050 Pin20 as address pin
  • ADP5061 reading via I2C
  • ADP5090_91: Need to cut the load of ADP5090 if temperature is under 0�C and above 40�C for Li-Ion Battery Charging
  • ADP5585 interrupt (/INT pin) not asserting
  • ADP5588_work under 3.3V
  • ADP7112: Materials declaration is missing from ADP7112 web page
  • ADR01 reference's output long-term drift calculation
  • ADR125: Output Capacitance
  • ADR127: Turn-on time when using a 0.1uF in parallel with a 10uF at its output?
  • ADR3450
  • ADR365 supplied with DCDC converter
  • ADR366: External Capacitors
  • ADR381 output capacitor ESR
  • any isolated RS-422 driver with no bit errors during EFT test?
  • Are any external components required?
  • Are there any layout considerations when designing in the ADP5052?
  • Are these devices automotive replacements for the ADM6316/18/19/20/21/22 parts?
  • Boost converter recommendation
  • CAN FD version of ADM3053
  • Can I configure ADM3491 in half duplex mode of operation
  • Can the 4 bucks run at different frequency?
  • Can the ADP1047/8 be used as a three-phase PFC controller?
  • Can the ADP1051 be used to control a buck fed push pull (or full bridge) power stage?
  • Can the CS1 pin of the ADP1043A, ADP1046A, ADP1050, ADP1051, ADP1055 be floating?
  • Can the voltage VS- pin (VS3- for ADP1046A) of ADP1050/51/55 operate at a voltage higher than 0.3V?
  • Can you supply PVIN1, PVIN2, PVIN3, PVIN4 and PVIN5 independently?
  • Can you use an inductor not specified in the datasheet?
  • Customer programmable fuses on ADP5053?
  • DAC power up default state of ADM1066
  • Difference between ADM2682E and ADM2687E
  • Does the output noise of the ADM7154/ADM7155 scale with the output voltage?
  • Drivers for Linux, No-OS microcontrollers and FPGA
  • Emissions by ADM2582E at 1.5GHz .. 1.1GHz
  • Explanation on ADM3483 Driver Output/Receiver Input Voltage
  • FAQ: Can I use the square wave at 50% duty cycle to sync with the ADP1047/48?
  • FAQ: How can I program Analog Devices' Digital Power products?
  • FAQ: How close to drop out voltage can one operate an LDO in order to squeeze the last ounce out of my circuits efficiency?
  • FAQ: How is voltage noise of an LDO measured?
  • FAQ: Layout of Switching Power Supply
  • FAQ: Layout recommendations for uPMU/PMU
  • FAQ: Photosensitive?
  • FAQ: Powering op-amps (or ADCs) with Dual Supplies
  • FAQ: Switching Regulators vs LDOs
  • FAQ: Temperature Grade
  • FAQ: Tips for building the ADIsimPower  boards
  • FAQ: Tips for soldering a LFCSP (QFN) package for a prototype
  • FAQ: Tips for taking efficiency data
  • FAQ: Vin range on an Adjustable Output LDO.
  • FAQ: Where to find package information for ADI parts
  • Green idle power saving
  • Half-bridge dc/dc controller
  • Hand soldering a 12 pin LFCSP
  • Hand soldering the dual belly pad ADP2384
  • How are the datasheets split out for these products?
  • How can I disable one channel when I don't' use it?
  • How close to drop out voltage can one operate an LDO in order to squeeze the last ounce out of my circuits efficiency?
  • How close to drop out voltage can one operate an LDO in order to squeeze the last ounce out of my circuits efficiency? (1)
  • How Do I Generate Negative Supplies?
  • How does the windowed watchdog operate at power up or after a reset event?
  • How is the output noise spectral density of a low noise LDO measured?
  • How is the output noise spectral density of an ultra-low noise LDO measured?
  • How is the RMS output noise of a low noise LDO measured?
  • How is the RMS output noise of an ultra-low noise LDO measured?
  • How much current can the ADN8831 supply to a TEC?
  • How should I connect ADM2483's Power Valid Pin (PVP) when not using it?
  • How to handle the sequence in ADP5052?
  • How to use the ADIsimPower design tools with ADIsimPE integration
  • Ib +- of Op
  • Inquiry on MAX Junction Temp Ratings.
  • Interface box for ADM1062 Sequencer
  • Is it possible to disable the watchdog functionality if not required?
  • Is it possible to order a version with factory programmed output voltages?
  • Is there any guideline for EEPROM programming and factory calibration for ADP1050 and ADP1051?
  • Isolated DC-DC Power Supply 20W, 36-72V Input , 5V output
  • Key difference between the ADM268xE and ADM258xE
  • level of automotive qualification do these parts have?
  • LT3439 Power Dissipation Calculation
  • LT8705 alternative
  • Measuring Signals in a Switching Power Supply
  • Minimum Load Current Operation - Zero load Operation
  • Paralleling LDOs to Create More Output Current
  • Power Management solution for Altera Arria 10 FPGA
  • Power Management Support Community INTRO
  • Powering Analog circuit through SMPS.
  • Product Analog Devices USB-SMBUS-CABLEZ.
  • PWM Setup ZVS app note
  • Ref design recommendation
  • selecting an external FET?
  • soldering temperature and soldering time
  • Thermal Information
  • Thermal Information of ADR01TUJZ-EP-R7
  • Typical markets/applications for this device
  • USB-SDP-CABLEZ software installer link is broken on User Guide.
  • Use ADM1062's ADC from inputs VX1-5, VP1-4, VH & Temp sensor without averaging?
  • Voltage Regulator for 16-bit ADC AD7626
  • VPx input impedance of ADM1069
  • What are "Standard models" listed in the datasheets?
  • What is ADIsimPower?
  • what is the best digital controller for  isolated boost mode current fed converter?
  • What is the difference between MTBF and MTTF?
  • What type of passive filters can be added to the output of a linear regulator without causing instability?
  • What's the ADP3634's internal driver's resistance, Rdson?
  • What's the big differentiation for ADP5052 in the market?
  • Where can I find a programming procedure to implement EEPROM programming of  ADP1051?
  • Where can I find the ADP1870 EVB Gerber Files?
  • Where can I find the Package/Leadframe material information for ADR225HFZ (8 ld Ceramic Flatpack)?
  • Why would a customer require a windowed watchdog part over a normal watchdog?

Powering Analog circuit through SMPS.

SMPS output has ripple and switching noise at its output. Such a supply could hamper performance of high resolution slow speed analog circuit.How to reduce it? A low noise linear regulator would do? An LC filter can work or both( LC filter followed by linear regulator)? A ferrite bead is also a general practice."Please suggest me how should i power my slow speed high resolution analog hardware(i am talking about process control, mainly temperature measurement applications)".


This is a very interesting topic and one that's hard to answer in a few lines of text.

First you should look at the datasheets of the part you are using to identify if there is a recommended power solutions, then identify the PSRR curves in the datasheet if they are available.

As a general rule if you signal of interest is in <100Khz most part have very good PSRR and the power domain does not need to be extremely clean. For parts with much higher bandwidth and signals in the 1Mhz to 1Ghz then noise from the power supply needs to be managed in multiple ways, filtering and LDOs.

If you are dealing with parts that are sensitive to noise at any frequency such as PLLs and VCOs then everything needs to be designed with low noise in mind.

We have some design examples in what we called the circuits from the lab section of our web site

http://www.analog.com/en/circuits-from-the-lab/CN0147/vc.html

http://www.analog.com/en/circuits-from-the-lab/cn0201/vc.html

http://www.analog.com/en/circuits-from-the-lab/CN0234/vc.html

http://www.analog.com/en/circuits-from-the-lab/CN0183/vc.html

Finally I recently recorded a session for ADI's Virtual Conference DC-13 that addressees exactly this topic.

Powering Noise Sensitive Systems
When it comes to high performance signal chains, you need high performance power solutions. Noise sensitive circuits such as analog-to-digital converters (ADCs), digital-to-analog converters (DACs), amplifiers, and phase lock loops (PLLs)—as well as FPGAs—demand low noise power supplies that require specialized design techniques. Engineers spend hours trying to figure out how to power these circuits without adding noise. This presentation will focus on understanding various methods for not only approaching but meeting system requirements. The session will introduce tested solutions and layout considerations that must be taken into account when designing with switching regulators and low drop out (LDO) regulators.
Presented by: Luca Vassalli, Power Management Applications Manager

This FAQ was generated from the following discussion: Powering Analog circuit through SMPS.

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