CS5317 datasheet(29/32 Pages) CIRRUS

29 / 32 page

two modes which use the phase locked loop will

require appropriate low pass filter components on

the Evaluation Board. The low pass filter compo-

nents help determine the PLL control loop

response, including its bandwidth and stability

and therefore directly affect the transient response

of the PLL control loop. Appropriate filter compo-

nents should be installed if a particular dynamic

response to changes of the CLKIN signal is de-

sired.

The filter components which are installed on the

board have been chosen for the following parame-

ters: MODE: CLKG2; CLKIN: 7,200; N=512;

damping factor: 1.0;

Control loop -3 dB band-

width:

2262 radians/second.

These parameters

yield R as 10 k

Ω and C as 0.22 µF for the filter

components.

The analog signal to be digitized is input to the

AIN BNC connector.

The digital output words

from the CS5317 are buffered by HEX inverters

as shown in Figure 3. The buffered versions of

the CLKOUT and DATA signals are available on

the header connector P1 in Figure 6. The serial

data signals out of the CS5317 are illustrated in

Figure 4. If remote control of the DOE line is

desired, the trace on the PC Board can be opened

and a wire connection can be soldered to the DOE

input line. Remote control of the RST line of the

CS5317 is also available if desired.

Figures 5 and 6 illustrate the serial to parallel shift

registers including timing information. The DATA

output signal from the CS5317 is input to the data

input of the shift register. An inverted version of

the CLKOUT signal is used to clock the DATA

into the shift registers. The two 8-bit shift register

ICs also include output latches. The rising edge

Note: For a complete description of serial timing see the CS5317 Data Sheet

CLKOUT

DATA

987

65432

DOUT

Figure 4 Serial Data Timing

DATA

Serial Data

Shifting Out

Parallel Data (D0-D15) Valid

Parallel Data Valid

DRDY

DACK

DOUT

Serial Data

Shifting Out

Figure 5. Parallel Data Timing

CDB5317

DS27DB3

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