CS5508-BSZ Cirrus Logic Inc, CS5508-BSZ Datasheet - Page 16

IC ADC 20BIT LOW PWR 20-SOIC

CS5508-BSZ

Manufacturer Part Number
CS5508-BSZ
Description
IC ADC 20BIT LOW PWR 20-SOIC
Manufacturer
Cirrus Logic Inc
Datasheet

Specifications of CS5508-BSZ

Data Interface
Serial
Number Of Bits
20
Sampling Rate (per Second)
100
Number Of Converters
1
Power Dissipation (max)
4.5mW
Voltage Supply Source
Analog and Digital, Dual ±
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
20-SOIC
Resolution (bits)
20bit
Sampling Rate
100SPS
Input Channel Type
Differential
Supply Current
340µA
Digital Ic Case Style
SOIC
No. Of Pins
20
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
598-1099-5

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
CS5508-BSZ
Manufacturer:
CIRRUS
Quantity:
20 000
16
External reference voltages can range from 1.0
volt minimum to 3.6 volts maximum. The com-
mon mode voltage range of the external
reference can allow the reference to lie at any
voltage between the VA+ and VA- supply rails.
Figures 5 and 6 illustrate how the CS5505/6/7/8
converters are connected for external and for in-
ternal voltage reference use, respectively.
Analog Input Range
The analog input range is set by the magnitude
of the voltage between the VREF+ and VREF-
pins. In unipolar mode the input range will equal
the magnitude of the voltage reference. In bipo-
lar mode the input voltage range will equate to
plus and minus the magnitude of the voltage ref-
erence. While the voltage reference can be as
great as 3.6 volts, its common mode voltage can
be any value as long as the reference inputs
VREF+ and VREF- stay within the supply volt-
Note: VREF = (VREF+) - (VREF-); Table excludes common mode voltage on the signal and reference inputs.
16
>(VREF - 1.5 LSB)
VREF/2 - 0.5 LSB
VREF - 1.5 LSB
Unipolar Input
<(+0.5 LSB)
+0.5 LSB
Figure 6. Internal Reference Connections
Voltage
0.1 µF
+VA
-VA
CS5505 and CS5507 (16 Bit)
Output
Codes
FFFE
FFFF
FFFF
7FFF
VA+
VREF+
VREF-
VREFOUT
VA-
8000
0001
0000
0000
CS5505/6/7/8
<(-VREF + 0.5 LSB)
>(VREF - 1.5 LSB)
-VREF + 0.5 LSB
VREF - 1.5 LSB
Bipolar Input
-0.5 LSB
Voltage
Table 2. Output Coding
>(VREF - 1.5 LSB)
VREF/2 - 0.5 LSB
ages for the A/D. The differential input voltage
can also have any common mode value as long
as the maximum signal magnitude stays within
the supply voltages.
The A/D converter is intended to measure dc or
low frequency inputs. It is designed to yield ac-
curate conversions even with noise exceeding
the input voltage range as long as the spectral
components of this noise will be filtered out by
the digital filter. For example, with a 3.0 volt
reference in unipolar mode, the converter will
accurately convert an input dc signal up to
3.0 volts with up to 15% overrange for 60 Hz
noise. A 3.0 volt dc signal could have a 60 Hz
component which is 0.5 volts above the maxi-
mum input of 3.0 (3.5 volts peak; 3.0 volts dc
plus 0.5 volts peak noise) and still accurately
convert the input signal (XIN = 32.768 kHz).
This assumes that the signal plus noise ampli-
tude stays within the supply voltages.
The CS5505/6/7/8 converters output data in bi-
nary format when converting unipolar signals
and in offset binary format when converting bi-
polar signals. Table 2 outlines the output coding
for the 16-bit CS5505/7 and the 20-bit CS5506/8
in both unipolar and bipolar measurement
modes.
VREF - 1.5 LSB
Unipolar Input
<(+0.5 LSB)
+0.5 LSB
Voltage
CS5506 and CS5508 (20 Bit)
FFFFF
FFFFF
FFFFE
Output
7FFFF
Codes
80000
00001
00000
00000
CS5505/6/7/8
<(-VREF + 0.5 LSB)
>(VREF - 1.5 LSB)
-VREF + 0.5 LSB
VREF - 1.5 LSB
CS5505/6/7/8
Bipolar Input
-0.5 LSB
Voltage
DS59F7
DS59F7

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