CS4215 datasheet(40/52 Pages) CIRRUS

40 / 52 page

GENERAL INFORMATION

The CDB4215 is designed to provide an easy

platform for evaluating the performance of the

CS4215 Multimedia Audio Codec. The board

provides a buffered serial interface for easy con-

nection to the serial port of a DSP or other serial

device. A single +5 V power supply is all that is

required to power the evaluation board.

The line input buffers are designed to accept

standard CD-level inputs of 2 VRMS and BNC-

to-phono adapters are included to support

various test setups. The microphone inputs con-

sist of two

1/4" mono jacks that are designed to

accept standard single-ended dynamic or con-

denser microphones.

The line outputs are supplied via BNC jacks

with two more BNC-to-phono adapters. The

headphone output is supplied via a

1/4" stereo

jack and will drive headphones of 48

Ω or

greater. This includes most "walkman" style

headphones. Speaker terminals are provided and

can be connected to speakers with an impedance

of 32

Ω or greater.

The film plots of the board are included to pro-

v ide an example of the op timum layout,

grounding, and decoupling arrangement for the

CS4215.

POWER SUPPLY CIRCUITRY

Figure 1 illustrates a portion of the CDB4215

schematic and includes the CS4215 codec along

with power supply circuitry. Power is supplied to

the board via two sets of binding posts, one for

digital and one for analog. The analog supply

must be +5 Volts and supplies power for the en-

tire codec (both digital and analog power supply

pins) along with the analog input buffers for the

line and microphone inputs. The digital supply is

also +5 Volts and supplies power to the digital

header buffer circuitry. Space for a ferrite bead

inductor, L1, has been provided so that the board

may be modified to power the codec from the

digital supply. Selection of L1 will depend on

the characteristics of the noise on the digital sup-

ply used.

ANALOG INPUTS

The analog inputs consist of a pair of

1/4" jacks

for two microphones, and a pair of BNC’s for

line level inputs. BNC-to-phono adapters are in-

cluded to allow testing of the line inputs using

coax or standard audio cables.

The line-level inputs go through a buffer, Fig-

ure 2, with a gain of 0.5 which allows input

signals of up to 2 VRMS.

The two microphone inputs are single-ended and

are designed to work with both condenser and

dynamic mics. The microphone input buffer cir-

cuit, shown in Figure 3, has a gain of 23 dB

thereby defining a full-scale input voltage to the

mic jacks of 19.5 mVpp.

ANALOG OUTPUTS

The CDB4215 includes three analog output

paths: a pair of line output BNC’s, a stereo

1/4"

headphone jack, and a pair of mono speaker ter-

minals.

The CS4215 drives the line outputs into an R-C

filter and then to a pair of BNC’s. As with the

line inputs, BNC-to-phono adapters are provided

for flexibility. The line outputs can drive an im-

pedance of 10 k

Ω or more, which is the typical

input impedance of most audio gear.

The stereo headphone output can drive head-

phones with an impedance of 48

Ω or greater.

This includes most "walkman" style headphones.

CDB4215

DS76DB3

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