CDB5571 Cirrus Logic Inc, CDB5571 Datasheet - Page 22

• Manufacturer Part Number: CDB5571
• Description: DEV BOARD FOR CS5571 W/MUX
• Manufacturer: Cirrus Logic Inc
• Type: A/Dr

Specifications of CDB5571

• Number Of Adc's: 1
• Number Of Bits: 16
• Sampling Rate (per Second): 100k
• Data Interface: Serial
• Inputs Per Adc: 2 Single
• Input Range: 2.4 ~ 4.2 V
• Voltage Supply Source: Dual ±
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: CS5571
• Product: Data Conversion Development Tools
• Conversion Rate: 100 KSPS
• Resolution: 16 bit
• Maximum Clock Frequency: 16 MHz
• Interface Type: SPI
• Supply Voltage (max): 3.3 V
• Supply Voltage (min): - 2.5 V
• For Use With/related Products: CS5571
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 598-1275; CDB5571-1

Figures 14 and 15 illustrate the small signal performance of the CS5571 with a 5.55 kHz signal at -80 dB
down. Figure 14 is with DITHER on and Figure 15 is with DITHER off. At -80 dB the signal is 1/10,000
of full scale, having a peak-to-peak magnitude of only a few codes. For small signals, DNL errors and
quantization errors can introduce distortion because the error in the code size, or the quantization error
without adequate dither, are a much greater percentage of the signal than with a full-scale input. Figure
15, with DITHER off, illustrates that distortion components can be introduced when there is not adequate
dither to randomize the quantization error.
Figures 16 and 17 illustrate DITHER on and DITHER off with a 5.55 kHz input at -100 dB. At -100 dB the
signal is only about 41 microvolts peak to peak. This is less than the one code width which is about
62.5 microvolts.
22
-100
-120
-140
-160
-100
-120
-140
-160
-20
-40
-60
-80
-20
-40
-60
-80
0
0
Figure 16. Spectral Performance, -100 dB
Figure 14. Spectral Performance, -80 dB
0
0
10k
10k
Dither On
Dither On
Frequency (Hz)
Frequency (Hz)
20k
20k
5.55 kHz, -80 dB
32k Samples @ 100 kSps
Dither On
30k
30k
40k
40k
3/25/08
10:56
50k
50k
-100
-120
-140
-160
-100
-120
-140
-160
-20
-40
-60
-80
-20
-40
-60
-80
0
0
Figure 17. Spectral Performance, -100 dB
Figure 15. Spectral Performance, -80 dB
0
0
10k
10k
Dither Off
Dither Off
Frequency (Hz)
Frequency (Hz)
20k
20k
30k
30k
40k
40k
CS5571
DS768PP1
50k
50k