Cirrus Logic AN234 - Manual

1
Copyright  Cirrus Logic, Inc. 2003
(All Rights Reserved)
http://www.cirrus.com
AN234
AK5394A to CS5381 Conversion
by Kevin L Tretter
1. Introduction
The CS5381 is a complete analog-to-digital converter for digital audio systems. The CS5381 performs
sampling, analog-to-digital conversion and anti-alias filtering, generating 24-bit values for both left and
right channels.
The CS5381 offers some unique advantages over the AK5394A including:
- Over 70% REDUCTION in package size (TSSOP)
- 50% less power consumption
- Fewer external components required (See Section 2)
- Overflow detect
- Integrated level shifters
- Over 80% less group delay (48kHz output sample rate)
Table 1 shows a comparison of the key specifications of these two devices.
Table 1. Comparison of Key Specifications
AK5394A CS5381
Conversion (Bits) 24 24
Dynamic Range (A-weighted) dB 123* 120
THD+N dB -110* -110
Analog Core Power Supply (VA) V +5.0 V +5.0 V
Digital Core Power Supply (VD) +3.3 V to +5.0 V +3.3 V to +5.0 V
Digital Interface Power Supply (VL) N/A +2.5 V to +5.0 V
Maximum Power mW 870 348
Maximum Sample Rate kHz 216 200
Package 28-pin SOP 24-pin SOIC/TSSOP
* Dynamic Range and THD+N specified with different input buffer topologies
JUL ‘03
AN234REV1