MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH ANALOG DEVICES VISUALDSP PLUSPLUS Manual de usuario descargar pdf (Pagina 52)

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dspConverter



Integrated DSP and Data Converter for Voice

DSP Selection Guide 51

ADI’s dspConverters feature our industry lead-

ing data converters, 16-bit fixed-point DSPs

and flash memory all packed into one small

(14 mm x 22 mm) BGA package.

The analog front ends are based on our

AD733xx family which include 16-bit linear

codecs, input/output conditioning circuitry and

a flexible serial interface. The DSPs are based

on the ADSP-218x family.

Analog Front Ends (AFEs)

The analog front ends are much more than

codecs. Each channel includes:

• Sigma-delta DAC

• Sigma-delta ADC

• PGA for each encoder and decoder

• Input conditioning circuitry

• Reference

• SPORT

No Digital Feedthrough Problems

One of the critical aspects of mixed-signal

design is digital feedthrough from high-speed

processors to high-resolution analog circuitry.

This is fully addressed in our dspConverters

with careful circuit layout and synchronization

of clocks. Test results have verified that clock

noise is absent from the digitized analog spec-

trum even when the DSP is running at full

speed.

Converter Performance and Group Delay

The converters are fully specified with

SNR+THD figures of 78 dB for the encoders

and 77 dB for the decoders. A notable feature

of the performance specification is it’s clarity.

Group delay can be critical in noise cancella-

tion applications. It’s important to cancel the

noise as close to the source as possible. Delays

increase modeling errors, require larger filters

and inhibit random noise cancellation systems.

All analog front ends in the family offer group

delays, which are 25 µs for the encoder and

50 µs for the decoder.

AD73411-40

AD73411-80

AD73422-40

AD73422-80

AD73460-80

Generic

6-Ch ADC

AFE

Channels

16K

Program

Memory

16K

Data

Memory

$17.65

$21.18

$20.41

$23.47

Price*

52 MIPS

DSP

dspConverter Selection Table

* US Dollars. Lowest grade suggested resale price per unit in 100 unit quantities

All pricing is budgetary – subject to change

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 61 62

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MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH ANALOG DEVICES VISUALDSP PLUSPLUS Manual de usuario Pagina 52

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