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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

1 2 3 4 5 6 7

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Página 1 - AK5394A to CS5381 Conversion

Página 2 - * See Section 9

AN23422. Typical Connection DiagramsFigure 1. CS5381 Typical Connection DiagramFigure 2. AK5394A Typical Connection DiagramFILT+AINL+AINL-VD0.1µFA/D

Página 3 - 4. Offset Calibration

AN23433. Pin CompatibilityTable 1 shows the pins of the AK5394A and the corresponding pins of the CS5381. Please note that theAK5394A has 28 pins, and

Página 4

AN23444.2 AK5394AThe AK5394A will automatically initiate a calibration sequence following a reset. The CAL pin (pin 9) is anoutput that indicates when

Página 5

AN2345Figure 3. Single-Ended to Differential Input Buffer8.2 Fully Differential Input BufferFigure 4 shows a fully differential analog input buffer.

Página 6 - 470 µF1000 µF

AN23469. Capacitor Size on Reference Voltage Pin(s)The CS5381 and the AK5394A both require external capacitance on the internal reference voltage pin(

Página 7

AN2347Contacting Cirrus Logic SupportFor a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic we

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Cirrus-logic AN234 Manual do Utilizador

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