CS4216 datasheet(49/58 Pages) CIRRUS

49 / 58 page

nal source. To select the CLKIN BNC, the J1

jumper must be placed in the EXT position.

When the J1 jumper is in the INT position, the

on-board oscillator is used as the master clock.

Both clock sources are buffered to guarantee a

clean signal and proper clock levels to the codec.

If sample frequencies other than the ones pro-

vided are needed, the oscillator can be replaced

with the proper frequency oscillator. The board

accepts crystals and provides the socket Y1 (refer

to Figure 8). When using a crystal, U8 must con-

tain an HCU04 unbuffered CMOS inverter. The

U8 socket is designed to accept either the

HCU04 or a crystal oscillator, and can alternate

between the two.

LAYOUT ISSUES

Figure 11 contains the silk screen, Figure 12

contains the component-side copper layer, and

Figure 13 contains the solder-side copper layer

of the CDB4216/8 evaluation board. These plots

are included to provide an example of how to

correctly layout a PCB for the codec.

Grounding and Power

74HCUO4

R55

10M

C44

33 pF

C43

33 pF

CLKIN-J1

0.1uF

Figure 8. Optional Clock Circuit

U11B

74HC132

CLKIN

U11A

CS4216

11.2896 MHz

Oscillator

Module

0.1 uF

EXT

INT

47.5k

Figure 7. Default Clock Circuit

CDB4216

DS83DB4

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