CS4216 datasheet(40/58 Pages) CIRRUS

40 / 58 page

GENERAL DESCRIPTION

The CDB4216/8 was designed to provide an

easy platform for evaluating the performance of

the CS4216 and CS4218 Stereo Audio Codecs.

Since the evaluation board contains a proper lay-

out and is performance tested, the user can

concentrate on engineering the rest of the system

thereby reducing the development time. The lay-

out should also be used as a guideline for

obtaining the best possible performance from the

CS4216 or CS4218. Lastly, the board can be

used as a benchmark and debugging tool for user

developed PCBs.

The evaluation board supports all serial modes

and includes decode circuitry to ease the selec-

tion of the serial mode and sub-mode of interest.

All serial interfaces are buffered for easy connec-

tion to the serial port of a DSP or other serial

device. The board can also be placed in a loop

back mode where the digital data is looped back

allowing an analog in to analog out testing vehi-

cle without an external processor. A single +5V

supply is all that is needed to power the board.

Analog inputs consist of a pair of line input buff-

ers (LIN1, RIN1) designed to accept a maximum

audio signal of 2VRMS and BNC-to-phono

adapters are included to support various test con-

figurations. The second pair of inputs contain a

example microphone input buffer supported by

two

1/4" mono jacks that are designed to accept

standard single-ended dynamic or condenser mi-

crophones.

The line outputs are supplied via BNC connec-

tors with two more BNC-to-phono adapters.

The film plots of the evaluation board are in-

cluded to provide an example of the optimum

layout, grounding, and decoupling arrangement

for the CS4216 or CS4218.

SELECTING A SERIAL MODE

The CS4216 supports four serial modes and

many sub-modes, and the CS4218 supports three

serial modes and sub-modes. Selecting the most

appropriate mode for a given application can be

time consuming. The CDB4216/8 contains a DIP

switch that simplifies this selection. Since the

CS4216/8 contains many multifunction pins, the

DIP switch lets the user select the configuration

and two PLDs decode the proper multifunction

pin values. Since these PLDs are only used to

simplify the configuration of the device, they

would not be needed in an end application which

would hard wire the configuration pins. Table 4

describes the multifunction pin values for a

given DIP switch setting. The PAL equations for

DIP switch decoding are given in Figures 8 and

All references to SM1 and SM2 apply only to

the CS4216. All references to SM3-MM, SM3-

MS, and I

2S apply only to the CS4218.

Serial Port Format

Table 1 lists the DIP switches used to select the

serial mode. SPF2 and SPF1 select one the four

serial modes of the CS4216 or one of three serial

modes for the CS4218. MA selects master

(MA = 1) or slave and is only useful in serial

modes 3 and 4. The majority of users select

SPF2

SPF1

Serial Mode

SM1

Slave

SM2

Slave

SM3

Slave

SM3

Master

SM4

Slave

SM4

Master

Table 1. DIP Switch, Serial Modes

CDB4216

DS83DB4

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