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Cirrus Logic AN248 User Manual

Cirrus Logic Hardware

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1

Copyright

Cirrus Logic, Inc. 2003

(All Rights Reserved)

http://www.cirrus.com

AN248

Transitioning to the CS4344 family

David Olivenbaum

Applications Engineer

1. Introduction

This application note describes how to easily transition to the CS4344 family from an existing design
which uses the CS4334/5/8 or CS4340/40A. The CS4344 family was designed to give a simple transition
path from the CS4334 family or the CS4340/40A. Please refer to the CS4344 data sheet for supplemental
information and specifications concerning operation of the device. A brief comparison between the
product families is shown in Table 1.

The CS4344 family offers better analog performance (dynamic range and THD+N), a smaller package,
and is more cost effective than the CS4340A and CS4340. For users of the CS4334, the CS4344 family
is a simple, yet affordable, upgrade to higher performance.

2. The Design Transition

2.1

Transitioning from the CS4340/40A

2.1.1

Hardware changes

The CS4344 family removes six pins from the sixteen pins of the CS4340/40A. The CS4344 family also
uses a smaller lead pitch which takes up about 75% less space than the CS4340/40A.

Figure 1 is a modification of the Figure 2 schematic which helps show the changes between the
CS4340/40A and the CS4344. Figure 1 shows the schematic for the CS4344/5/6/8. Figure 2 shows
the original example schematic for the CS4340/40A.

CS4344

CS4340A CS4340 CS4334

Dyna m ic Ra nge

dB

105

101

101

96

THD+ N

dB

-95

-91

-91

-88

Re solution

bits

24

24

24

24

Sa mple Ra te

kHz

192

192

96

96

Pow e r Supply

V

3-5

3-5

3-5

5

Volum e Control

No

No

No

No

Auto Fs De te ct

Ye s

Yes

No

No

Pa cka ge

10TSSOP

16SOIC

16SOIC

8SOIC

Price (1K)

$1.55

$2.15

$1.95

$1.35

Table 1. Product Comparison

DEC ‘03

AN248rev1