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Reference Design for CS42L51

Features

! Ultra Small Layout

! Single AAA Battery Source

! 1/8” Stereo Input Allows up to 2 Vrms Signals

! On-Board MIC

! 1/8” Stereo Headphone Output Jack

! S/PDIF Input (CS8416 Receiver)

! Flexible User Interface

– 2 Pushbuttons Enable, Disable and

Navigate between Reset, Standby, Input

Source and Effects Options

– 2 Pushbuttons Adjust Volume and Effects

CRD42L51 Actual Size

Description

The CRD42L51 evaluation board provides a quick and

easy evaluation of select features in the CS42L51 Low

Power, Stereo CODEC. Four pushbuttons and sixteen

LED’s comprise the user interface, allowing manipula-

tion of the CS42L51’s registers and control clock/data

routing between the CODEC, crystal oscillator, and

S/PDIF Receiver.

Two 1/8” stereo jacks provide analog input and output

connections, and a S/PDIF optical receiver provides a

digital input connection. An on-board microphone dem-

onstrates the high dynamic range of the CS42L51’s

Programmable Gain Amplifier (PGA) and MIC pre-

amplifier.

Power is derived from a single AAA battery boosted up

to 3.3 V for the interface and control logic, then regulat-

ed down to 1.8 V for the CS42L51’s analog/digital core

and headphone supply.

The CRD42L51 highlights the ultra small layout re-

quired for the CS42L51. Required components include

only a few small ceramic capacitors and resistors.

ORDERING INFORMATION

CRD42L51 Reference Design

LED Selection

Indicators

Battery Clip

CS42L51

Microcontroller

1/8" Stereo Line

Input Jack

Omni-directional

Microphone

1/8" Stereo

Headphone Jack

Optical

Input Jack

Push Buttons

AAA

I²C Control/Reset

Clocks/Data

+3.3 V

12.2880 MHz

Oscillator

+1.8 V

Step Up DC-DC

Converter w/

Linear Reg.

Master Clock

CS8416

DECEMBER '05

DS679RD1

CRD42L51

Summary of content (19 pages)

PAGE 1
CRD42L51 Reference Design for CS42L51 Features Description ! Ultra Small Layout The CRD42L51 evaluation board provides a quick and easy evaluation of select features in the CS42L51 Low Power, Stereo CODEC. Four pushbuttons and sixteen LED’s comprise the user interface, allowing manipulation of the CS42L51’s registers and control clock/data routing between the CODEC, crystal oscillator, and S/PDIF Receiver.
PAGE 2
CRD42L51 TABLE OF CONTENTS 1. QUICK-START GUIDE ........................................................................................................................... 3 2. FUNCTION & LEVEL DETAILS ............................................................................................................ 4 3. SYSTEM OVERVIEW ............................................................................................................................. 5 3.1 Power (U2) .....................................
PAGE 3
CRD42L51 1. QUICK-START GUIDE 4. Push both SELECT buttons simultaneously to turn off the Reset function. The board will enter Standby for a moment and then automatically activate the Line function. 5 4 5. Use any one of the SELECT buttons to navigate between and shift the focus to select functions. To turn selected functions on or off, push both SELECT buttons simultaneously. The assocated LED will turn on or off. 6.
PAGE 4
CRD42L51 2. FUNCTION & LEVEL DETAILS State/LED Function Illumination Reset Standby Line MIC S/PDIF Bass Treble Limiter ALC Description ON CS42L51, CS8416, optical receiver, oscillator held in reset and disabled. OFF CS42L51, oscillator out of reset. CS8416 and optical receiver controlled by S/PDIF function. The Line function is enabled automatically. ON CS8416, optical receiver, oscillator held in reset and disabled; CS42L51 soft powered down.
PAGE 5
CRD42L51 3. SYSTEM OVERVIEW The CRD42L51 reference design provides a quick and general overview of the features in the CS42L51 CODEC and provides a reference of an ultra small layout design. Line, MIC and S/PDIF sources are accomodated, and a microcontroller automatically configures the board and the CODEC’s internal registers for straightforward operation. The CRD42L51 schematic-set has been partitioned into four pages and is shown in Figures 2 through 5. 3.
PAGE 6
CRD42L51 3.8 Switch & Pushbutton The POWER switch engages the AAA battery when switched to the ON position. Power is applied to the board and the microcontroller initializes. The SELECT pushbutton switches allow the user to navigate back and forth between the FUNCTION options. When both SELECT buttons are pushed simultaneously, the state of the function that receives focus (indicated by a blinking LED) is toggled.
PAGE 7
CRD42L51 4. SYSTEM CONNECTIONS & INTERFACE Connector/ Interface Reference Designator Input/Output AAA BT1 Input Battery Power Supply. < SELECT S3 Input Pushbutton for navigating to the left or upwards. On/Off (function enable/disable) control when pushed simultaneously with SELECT >. SELECT > S4 Input Pushbutton for navigating to the right or downwards. On/Off (function enable/disable) control when pushed simultaneously with < SELECT.
PAGE 8
DS679RD1 CRD42L51 BLOCK DIAGRAM Push Buttons LED Selection Indicators Step Up DC-DC Converter w/ Linear Reg. +3.3 V +1.8 V AAA Battery Clip Figure 5 on page 12 I²C Control/Reset Microcontroller Figure 4 on page 11 Optical Input Jack CS8416 1/8" Stereo Line Input Jack Clocks/Data CS42L51 Figure 3 on page 10 12.2880 MHz Oscillator Figure 2 on page 9 Omni-directional Microphone Master Clock 1/8" Stereo Headphone Jack 8 CRD42L51 Figure 1.
PAGE 9
5. CRD42L51 SCHEMATICS Figure 2.
PAGE 10
DS679RD1 CRD42L51 10 Figure 3.
PAGE 11
CRD42L51 DS679RD1 Figure 4.
PAGE 12
DS679RD1 Figure 5.
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DS679RD1 6. CRD42L51 LAYOUT 13 CRD42L51 Figure 6.
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DS679RD1 14 CRD42L51 Figure 7.
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Figure 8.
PAGE 16
DS679RD1 Figure 9.
PAGE 17
Figure 10.
PAGE 18
DS679RD1 18 CRD42L51 Figure 11.
PAGE 19
CRD42L51 7. REVISION HISTORY Release RD1 Changes Initial Release Contacting Cirrus Logic Support For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find the one nearest to you go to www.cirrus.com/corporate/contacts/sales.cfm IMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable.