Cirrus Logic AN248 - Manual

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