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  • "quad-buffer" headphone amplifier
  • AD1835: Output filters
  • AD1835A: DC offset voltage
  • AD1836: Sampling at 22.05kHz
  • AD1845: DC offset
  • AD1852: ESD sensitivity, HBM model data missing from datasheet
  • AD1853 EVB
  • AD1853: output impedance
  • AD1853: Two devices in parallel
  • AD1854: SPI port unused
  • AD1862
  • AD1871 single ended input range
  • AD1877: Calculation of the LSB value
  • AD1896: Configuration
  • AD1937: Failure due to  I2C interface
  • AD1939
  • AD1939: datasheet contradictions on SPI timing specification
  • AD193x family - supporting Sample Rates lower than 32 kHz
  • AD1955: Independency of the channels
  • AD1974 Stop Band Filter Response
  • AD1981 PCB Layout recommendation
  • AD1981B drivers
  • AD1981B EVB
  • AD1986: AC97 code
  • AD1992: Driving the input stage
  • AD73311: Power supply
  • AD73311: Power supply sequencing problem, using DVDD = 3.3V and AVDD = 5.2V
  • AD73311L: Cascade running at different sampling speeds
  • AD73322/AD73322L compatibility
  • AD73322: CD measurability
  • AD73322: Vref transfer function
  • AD73322L: Frequency response
  • AD73360 timing questions
  • AD73360: Frequency response over sample rate
  • AD73360: Grounding
  • AD73360: Lower limit of the MCLK
  • AD73360: Reference voltage
  • AD73360: SDOFS in figure 10
  • AD73360: Settling time when changing the PGA gain
  • AD73360AR: DC performance
  • AD73360L: Reference does not always power up
  • ADAU1761: Can I connect one analog and one digital input channel to the ADAU1761 and process both of them together?
  • ADAU1966 maximum load current
  • ADAU1966: If using a direct MCLK can I leave LF and PLLVDD pins disconnected?
  • AVDD and DVDD range
  • Binary 2.20 format
  • Can AD1836A work at 32KHz or 44.1KHz sample rate?
  • Change sample rate by controlling SE pin.
  • Clicks and pops on power up
  • Dejitter issue
  • Do Analog Devices still have a range of HD Audio Codecs or has this technology all been sold off to Conexant?
  • Does the AD1852 accept SPDIF format?
  • Does volume control setting affect THD+N ?
  • EVAL-ADAU1472Z Evaluation Board support files (public)
  • EVAL-MICT5818Z microphone board support files (public)
  • EVAL-SSM2518Z evaluation board documentation and DLL for I2C control
  • Evaluation board Datasheet
  • FAQ: Can a digital microphone's PDM output be directly connected to an I2S input?
  • FAQ: Can MEMS mics be soldered to a flex PCB?
  • FAQ: Is a microphone with higher sensitivity better than one with lower sensitivity?
  • Gerber files for Eval board
  • How do I handle unused digital pins on an AD193x codec?
  • How to connect unused SDATA inputs on ADAU1966?
  • How to create an EEPROM image for the ADAU1772 that has different filter coefficients in Bank A and Bank B
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  • Video: Getting started with the EVAL-ADMP441Z
  • Video: Microphone Array Beamforming with the ADMP504
  • Whether it is pin compatible with TI TPA2010, On-Semi NCP2820?
  • Why doesn't Analog Devices manufacture 32-bit audio converters?
  • Working at 8KHz sample rate

AD73322: CD measurability

Q 

I want to make measurements at the tachometer output from dc-motors. This
signal is a dc-voltage with ac-parts (if the motor accelerate or stop). The
bandwith is therefore dc-max 2kHz. Can I use the ad-inputs of the ad73322 for
such a measurement (in the datasheet are examples of dc-in and dc-out
configurations) ?
I ask, because I had the infoemation, thjat sigma-delta converters are not able
to convert dc-signals.
Do you have an layout example for the ad73322 in the RU28 (tssop) package?
Do you also have some hints for decoupling if the supply voltage comes from an
DC-DC converter (operates at 300kHz) ?

 

A 

1)Firstly I must explain that the AD73322…family of parts are designed for the
telephony market, they are not characterised for DC operation, as you can see
from the datasheet, we do not give typical DC specs of linearity, offset and
gain errors. In addition , the analog front end is designed to work with a dc
bias at Vref, therefore  you may dc couple the i/p’s if the DC voltage of the
signal is at the same dc voltage of the reference, otherwise you need to ac
couple the signal.

Sigma delta converters that are designed for the industrial market are very
capable of converting dc signals, it is the ADC’s and DAC’s designed for the
audio market that are not specified for DC operation, such as the AD73322.
This  allows us to produce CODEC’s that are very cost effective due to the
elliminatin of the majority of DC testing that is carried out on our industrial
converters.


This address points to all the ap-notes available on sigma delta converter s
that we have posted on our web site.

We have a large range of converters that operate from DC to 2Khz, can you
detail your i/p signal range, the supply available, the resolution required,
the digital interface…plus any other relevant criteria, and I will get back to
you as soon as possible with a possible solution/solutions.

2)I take it you are refering to a land pattern for the AD73322 TSSOP package.

LANDS

For pattern of the solder lands for any of our packages we recommend the
standard layout.  You should be able to find it at the website of the IPC
(Institute for Interconnecting and Packaging Electronic Circuits). At
http://www.ipc.org/

Under "Design"  one will find a land pattern calculator that will
enable one to view the patterns in the current standard as well as calculate
new patterns from  component data. It contains a user searchable database of 
patterns for  components not yet approved by EIA or EIAJ.

Analog Devices does  not usually  issue recommendations on land patterns
because these are partially  dependent on the board design rules used, and on
the soldering processes used  by the board assemblers.


3) Low dropout regulators are often used following switching regulators for
better regulation and lower noise. Low dropout regulators such as the ADP3310
are desirable in these applications because they require only a small input to
output series voltageto maintain regulation.
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