Cirrus Logic AN248 User Manual

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.

CS4344 CS4340A CS4340 CS4334
Dynamic Range
THD+N
Resolution
Sample Rate
Pow er Supply
Volum e Control No
Auto F s De tect Yes
Pa ckage 10TSSOP
Price (1K) $1.55

dB
dB

bits

kHz

V

Table 1. Product Comparison

105

-95
24

192

3-5

101 101 96

-91 -91 -88
24 24 24

192 96 96

3-5 3-5 5

No No No

Yes No No

16SOIC 16SOIC 8SOIC

$2.15 $1.95 $1.35

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.

http://www.cirrus.com

CopyrightCirrus Logic, Inc. 2003

(All Rights Reserved)

DEC ‘03

AN248rev1

1

Figure 1. CS4344/5/6/8 Design Schematic

AN248

Figure 2. CS4340/40A Design Schematic

The changes made from Figure 2 to Figure 1 were as follows:

• Removed Q1, Q2, Q3, Q4, R7, and R8.

• Deleted the nets RST

• Changed C7 to10 µF, changed C10 to 3.3 µF, changed R3 and R5 to 470 Ω.

• Replaced CS4340/40A with CS4344.

2

, DIF1, DIF0, and DEM.