Datasheet

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SBAS203J − MARCH 2002 − REVISED JANUARY 2008
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23
OVERVIEW
The MSC1210 ADC structure is shown in Figure 12. The
figure lists the components that make up the ADC, along
with the corresponding special function register (SFR)
associated with each component.
ADC INPUT MULTIPLEXER
The input multiplexer provides for any combination of
differential inputs to be selected as the input channel, as
shown in Figure 13. If AIN0 is selected as the positive
differential input channel, any other channel can be selected
as the negative differential input channel. With this method,
it is possible to have up to eight fully differential input
channels. It is also possible to switch the polarity of the
differential input pair to negate any offset voltages.
In addition, current sources are supplied that will source or
sink current to detect open or short circuits on the pins.
TEMPERATURE SENSOR
On-chip diodes provide temperature sensing capability.
When the configuration register for the input MUX is set to
all 1s, the diodes are connected to the input of the ADC.
All other channels are open.
Σ
Σ
X
Input
Multiplexer
Temperature
Sensor
Buffer PGA
Sample
and Hold
ADMUXD7h
REFIN+
REFIN
−
REFIN+
f
MOD
REFIN
−
AIN5
AIN6
AIN7
AINCOM
ADCON1DDh
ADCON2DEh
ADCON3DFh
OCR GCR ADRES
SUMR
D3h
D2h D1h D6h D5h D4h DBh DAh D9h
E5h E4h E3h E2h
Offset
Calibration
Register
ADC0N0DCh ACLKF6h
SSCON
E1h
ODACE6h
Offset
DAC
∆Σ
ADC
Modulator
FAST
SINC2
SINC3
AUTO
ADC
Result Register
Σ
Summation
Block
V
IN
AIN2
AIN3
AIN4
AIN0
AIN1
f
SAMP
f
DATA
Gain
Calibration
Register
Burnout
Detect
AV
DD
In+
AGND
In
−
Burnout
Detect
AISTAT.5A7h
AIE.5A6h
AISTAT.6A7h
AIE.6A6h
Figure 12. MSC1210 ADC Structure