CS5014 datasheet(27/40 Pages) CIRRUS

27 / 40 page

analysis with the Discrete Fourier Transform",

Proc. IEEE, Vol. 66, No. 1, Jan 1978, pp.51-83.

This is available on request from Crystal Semi-

conductor.

Figures 18, 21, and 23 show the performance of

the CS5012A/14/16 with 1kHz full-scale inputs.

Figure 19 shows CS5012A performance with

12kHz full-scale inputs. Notice that the perform-

ance CS5012A/14/16 closely approaches that of

the corresponding ideal ADC.

CS5012A High Frequency Performance

The CS5012A performs very well over a wide

range of input frequencies as shown in Figure 24.

The figure depicts the CS5012A-KP7 tested un-

der four different conditions. The conditions

include tests with the voltage reference set at 4.5

and at 2.5 volts with input signals at 0.5 dB down

from full scale and 6.0 dB down from full scale.

The sample rate is at 100 kHz for all cases. The

plots indicate that the part performs very well

even with input frequencies above the Nyquist

rate. Best performance at the higher frequencies

is achieved with a 2.5 volt reference.

100

120

140

160

180

200

Signal to

Noise +

Distortion

Input Frequency (kHz)

f s

CS5012A

fs=100 kSps

4.5

2.5

4.5

2.5

FS-0.5dB

FS-6.0dB

VREF

Signal

(dB)

Figure 2

4. CS5012A High Frequency Input Performance

Signal

Amplitude

Relative to

Full Scale

Input Frequency

S/(N+D): 97.5 dB

0dB

-20dB

-40dB

-60dB

-80dB

-100dB

-120dB

f /2

Figure 2

2. Plot of Ideal 16-bit ADC

Signal

Amplitude

Relative to

Full Scale

Input Frequency

0dB

-20dB

-40dB

-60dB

-80dB

-100dB

-120dB

25 kHz

Sampling Rate: 50 kHz

Full Scale: 9V p-p

S/(N+D): 92.4 dB

1 kHz

Figure 2

3. CS5016 FFT plot with 1 kHz

Full Scale Input

CS5012A, CS5014, CS5016

DS14F8

2-33

CS5012A CS5014 CS5016

DS14F9

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