CDB5571 Cirrus Logic Inc, CDB5571 Datasheet - Page 23

• 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

or about 1/10 of a code width. The converter can reliably digitize this signal because of its excellent DNL
and proper dither.
Figure 19 is a spectral plot of the converter with its input grounded. The spectral information is on a log-
arithmic frequency axis as this illustrates the very low frequency behavior of the converter. Figure 19 was
produced from averaging the results of 16 FFT outputs using 2 million samples each. This plot also illus-
trates that the converter noise floor is free of spurious components that may be present in other converters
due to on-chip digital interference.
DS768PP1
Figure 18 illustrates a test signal of 5.55 kHz, 116.3 dB down, which is only 6.3 microvolts peak to peak,
-100
-120
-140
-160
-180
-20
-40
-60
-80
0
0.1
1
Figure 19. Spectral Plot of Noise with Shorted Input
-100
-120
-140
-160
-20
-40
-60
-80
Figure 18. Spectral Performance, -116.3 dB
0
0
10
10k
3/25/08
10:56
Dither On
Frequency (Hz)
20k
Frequency (Hz)
100
30k
40k
1k
50k
Shorted Input
2M Samples @ 100 kSps
16 Averages
10k
CS5571
50k
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