CDB4923 datasheet(5/50 Pages) CIRRUS

No de pièce	CDB4923

Description	Evaluation Board

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Fabricant	CIRRUS [Cirrus Logic]

Site Internet	http://www.cirrus.com

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CDB4923 CDB49300

DS262DB2

5

1. CDB4923 VS. CDB49300

The CDB4923 and CDB49300 are two customer

development boards built from a single platform -

the CDB4923/300. This development board replac-

es the CDB4923 Rev. A and Rev. B.

Although the CDB4923/CDB49300 boards look

very similar, it is important to be aware that when

shipped from the factory, the CDB4923 is config-

ured for only the CS4923 family of audio decoders

and the CDB49300 is configured only for the

CS49300 family of audio decoders.

The features distinguishing the two boards are the

following:

•

DSP Power Setting

•

DSP PLL Filter Topology

1.1

DSP Power

The CS4923 family is designed to operate with a

core voltage of +3.3 V, and the CDB4923 is

shipped with the DSP Power jumper in the +3.3 V

position. The CS49300 family is designed to oper-

ate with a core voltage of +2.5 V, and the

CDB49300 is shipped with the DSP Power jumper

in the +2.5 V position. Attempting to use an audio

decoder on the wrong board (e.g., CS49300 on a

CDB4923) can cause unpredictable results and

damage the decoder.

1.2

DSP PLL Filter

The PLL of the CS4923 is different than that of the

CS49300. Consequently, the optimized external

PLL filters for each family of audio decoders is dif-

ferent. The CDB4923 is optimized for the CS4923

family and the CDB49300 is optimized for the

CS49300 family. Attempting to use an audio de-

coder on the wrong board (e.g., CS49300 on a

CDB4923) can cause unpredictable results.

Specifically, the relevant PLL filter components

for the CDB4923 are:

•

R246 = 0

Ω

•

C155 = 0.22

µF

The relevant PLL filter components for the

CDB49300 are:

•

R246 = 33 k

Ω

•

C155 = 0.22

µF

•

C113 = 0.01

µF

Although the boards are tailored for one specific

family of audio decoders, the operation of the

CDB4923 and CDB49300 is effectively the same.

This document will generically refer to the

CDB4923/300 except in those instances where

there is a difference between the boards.

2. OPERATION

The CDB4923/300 is designed to allow full evalu-

ation of the CS4923 family and CS49300 family of

audio DSPs. The members of each audio decoder

family are electrically equivalent, so it is possible

to use any member of the CS4923 family in the

CDB4923 and any member of the CS49300 family

in the CDB49300. In the context of this document,

CS492x should be interpreted as any member of the

CS4923 family and CS493xx should be understood

to be any member of the CS49300 family.

The CDB4923/300 is composed of 8 distinct re-

gions: DSP, Control Interface, Control Logic,

Clocks, Analog I/O, Digital I/O, Patch area, and

Power. Each board region has a number of compo-

nents and will be briefly discussed below. A more

thorough description of each will be given in dedi-

cated sections of this document which can be

quickly located in the Table of Contents.

The DSP section includes the audio decoder

(CS492x Multichannel Audio Decoder or CS493xx

Universal Audio Decoder) under evaluation, jump-

ers for controlling DSP power and DSP configura-

tion pins, and stake headers which provide access

to all relevant DSP pins. The jumpers allow the

user to select between +2.5 V or +3.3 V on the DSP

power pins (pre-configured at the factory for the

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