CS5524-AS Cirrus Logic Inc, CS5524-AS Datasheet - Page 32
![A/D Converter (A-D) IC](/photos/19/0/190076/3833506_sml.gif)
CS5524-AS
Manufacturer Part Number
CS5524-AS
Description
A/D Converter (A-D) IC
Manufacturer
Cirrus Logic Inc
Datasheet
1.CS5524-AS.pdf
(56 pages)
Specifications of CS5524-AS
Sample Rate
606SPS
Input Channels Per Adc
4
Mounting Type
Surface Mount
No. Of Channels
4
Power Rating
9mW
Peak Reflow Compatible (260 C)
No
Supply Voltage Max
5.25V
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
CS5524-ASZ
Manufacturer:
CIRRUS
Quantity:
20 000
tion of offset to occur in the 25 mV, 55 mV, and
100 mV ranges, the AIN- pin must be at the proper
common-mode-voltage as specified in ‘Common
Mode +Signal AIN+/-’ specification in the Analog
Input section (if AIN- = 0 V, NBV must be between
-1.8 V to -2.5 V). For self-calibration of offset in the
1.0 V, 2.5 V, and 5 V ranges, the inputs of the mod-
ulator are connected together and then routed to the
VREF- pin as shown in Figure 12.
For self-calibration of gain, the differential inputs
of the modulator are connected to VREF+ and
VREF- as shown in Figure 13. For any input range
other than the 2.5 V range, the converter’s gain er-
ror can not be completely calibrated out when using
self-calibration. This is due to the lack of an accu-
rate full scale voltage internal to the chips. The
2.5 V range is an exception because the external
reference voltage is 2.5 V nominal and is used as
32
Reference
Figure 11. Self Calibration of Offset (Low Ranges)
Figure 13. Self Calibration of Gain (All Ranges)
AIN+
AIN-
+
-
CLOSED
OPEN
VREF+
VREF-
S1
AIN+
AIN-
S2
+
-
X20
+
-
X20
CLOSED
CLOSED
OPEN
OPEN
+
-
+
-
the full scale voltage. In addition, when self-cali-
bration of gain is performed in the 25 mV, 55 mV,
and 100 mV input ranges, the instrumentation am-
plifier’s gain is not calibrated. These two factors
can leave the converters with a gain error of up to
±20% after self-calibration of gain. Therefore, a
system gain calibration is required to get better ac-
curacy, except for the 2.5 V range.
2.3.2 System Calibration
For the system calibration functions, the user must
supply the calibration signals to the converter which
represent ground and full scale. When a system offset
calibration is performed, a ground referenced signal
must
Figures 14 and 15.
As shown in Figures 16 and 17, the user must input
a signal representing the positive full scale point to
Figure 14. System Calibration of Offset (Low Ranges)
CM + -
0V + -
Figure 12. Self Calibration of Offset (High Ranges)
External
Connections
VREF-
AIN+
AIN-
be
AIN+
AIN-
applied
CS5521/22/23/24/28
+
-
to
+
-
X20
X20
the
CLOSED
S4
OPEN
OPEN
S2
S1
converters.
+
-
DS317F2
+
-
See