CDB5566 Cirrus Logic Inc, CDB5566 Datasheet - Page 20

• Manufacturer Part Number: CDB5566
• Description: Dev Bd For I/C 24-bit, Diff, 5kSPS, DAQ
• Manufacturer: Cirrus Logic Inc
• Type: A/Dr

Specifications of CDB5566

• Number Of Adc's: 1
• Number Of Bits: 24
• Sampling Rate (per Second): 5k
• Data Interface: SPI™
• Inputs Per Adc: 2 Differential
• Input Range: 0 ~ 4.096 V
• Power (typ) @ Conditions: 20mW @ 5kSPS
• Voltage Supply Source: Analog and Digital, Dual ±
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: CS5566
• Conversion Rate: 5 KSPS
• Resolution: 24 bit
• Maximum Clock Frequency: 8 MHz
• Interface Type: SPI
• Supply Voltage (max): 3.3 V
• Supply Voltage (min): - 2.5 V
• Product: Data Conversion Development Tools
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: CS5566
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 598-1557; CDB-5566

3/25/08
CS5566
3.8 AIN & VREF Sampling Structures
The CS5566 uses on-chip buffers on the AIN+, AIN-, and the VREF+ inputs. Buffers provide much higher
input impedance and therefore reduce the amount of drive current required from an external source. This
helps minimize errors.
The Buffer Enable (BUFEN) pin determines if the on-chip buffers are used or not. If the BUFEN pin is con-
nected to the V1+ supply, the buffers will be enabled. If the BUFEN pin is connected to the V1- pin, the
buffers are off. The converter will consume about 5 mW less power when the buffers are off, but the input
impedances of AIN+, AIN- and VREF+ will be significantly less than with the buffers enabled.
3.9 Converter Performance
The CS5566 achieves excellent differential nonlinearity (DNL).
Figure 10
illustrates the code widths on
the typical scale of ±1 LSB and on a zoomed scale of ±0.2 LSB.
(Zoom View)
Figure 10. CS5566 DNL Plot
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