MAX11359A_12 Datasheet, PDF (38/67 Pages) Maxim Integrated Products – 16-Bit Data-Acquisition System with ADC, DAC, UPIOs, RTC, Voltage Monitors, and Temp Sensor

MAX11359A
16-Bit Data-Acquisition System with ADC, DAC,
UPIOs, RTC, Voltage Monitors, and Temp Sensor
DATA Register (Power-On State: 0000 0000 0000 0000)
MSB
ADC15
ADC14
ADC13
ADC12
ADC11
ADC7
ADC6
ADC5
ADC4
ADC3
ADC10
ADC2
ADC9
LSB
ADC1
ADC8
ADC0
ADC<15:0> Analog-to-digital conversion data bits.
These 16 bits are the results from the most recently
completed conversion. The data format is unsigned;
binary for unipolar mode, and two’s complement for
bipolar mode.
OFFSET CAL Register (Power-On State: 0000 0000 0000 0000 0000 0000)
MSB
OFFSET23
OFFSET22
OFFSET21
OFFSET20
OFFSET19
OFFSET18
OFFSET17
OFFSET16
OFFSET15
OFFSET14
OFFSET13
OFFSET12
OFFSET7
OFFSET6
OFFSET5
OFFSET4
OFFSET<23:0>: Offset-calibration bits. The data format
is two’s complement and is subtracted from the ADC
output before being written to the DATA register. The
offset calibration allows input offset errors between
V_REF ±50% to be corrected in unipolar or bipolar mode.
The MAX11359A can perform system offset calibration
or self offset calibration. Self-calibration performs a cali-
OFFSET11
OFFSET3
OFFSET10
OFFSET2
OFFSET9
OFFSET1
OFFSET8
LSB
OFFSET0
bration for the entire signal path. See the ADC
Calibration section for more details.
The ADC input voltage range specifications must
always be obeyed, and the OFFSET CAL register effec-
tively offsets the ADC digital scale to a “zero” value
determined by the calibration.
GAIN CAL Register (Power-On State: 1000 0000 0000 0000 0000 0000)
MSB
GAIN23
GAIN22
GAIN21
GAIN20
GAIN19
GAIN18
GAIN17
GAIN16
GAIN15
GAIN14
GAIN13
GAIN12
GAIN7
GAIN6
GAIN5
GAIN4
GAIN<23:0>: Gain-calibration bits. The data format is
unsigned binary with 23 bits to the right of the decimal
point and scales the ADC output before being written to
the DATA register. The gain calibration allows full-scale
errors between -V_REF/2 and +V_REF/2 to be corrected in
unipolar mode, and full-scale errors between (+50% x
V_REF) and (+200% x V_REF) in unipolar or bipolar mode.
The MAX11359A can perform system gain calibration
or self gain calibration. Self-calibration performs a cali-
GAIN11
GAIN3
GAIN10
GAIN2
GAIN9
GAIN1
GAIN8
LSB
GAIN0
bration for offsets in the ADC, and system calibration
performs a calibration for the entire signal path. See the
ADC Calibration section for more details.
The ADC input voltage range specifications must always
be obeyed, and the GAIN CAL register effectively scales
the ADC digital output to a full-scale value determined
by the calibration. The usable gain-calibration range is
limited to less than the full GAIN CAL register digital-
scaling range by the internal noise of the ADC.
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Maxim Integrated