參數(shù)資料
型號(hào)： EVAL-ADUC834QSZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 17/80頁(yè)
文件大?。?/td> 0K
描述： KIT DEV QUICK START ADUC834
標(biāo)準(zhǔn)包裝： 1
系列： QuickStart™ 套件
類型： MCU
適用于相關(guān)產(chǎn)品： ADuC834
所含物品： 評(píng)估板，線纜，電源，軟件和文檔
REV. A
–24–
ADuC834
MU
X
AIN3
AIN4
AIN5
ON-CHIP
TEMPERATURE
SENSOR
-
MODULATOR
PROGRAMMABLE
DIGITAL FILTER
-
ADC
REFIN(–)
REFIN(+)
CHOP
OUTPUT
AVERAGE
OUTPUT
SCALING
DIGTAL OUTPUT
RESULT WRITTEN
TO ADC1H/L SFRs
CHOP
-
ADC
THE
-
ARCHITECTURE
ENSURES 16 BITS NO MISSING
CODES. THE ENTIRE -
ADC
IS CHOPPED TO REMOVE
DRIFT ERRORS.
MUX
OUTPUT AVERAGE
AS PART OF THE CHOPPING
IMPLEMENTATION, EACH
DATA-WORD OUTPUT
FROM THE FILTER IS
SUMMED AND AVERAGED
WITH ITS PREDECESSOR
TO NULL ADC CHANNEL
OFFSET ERRORS.
THE MODULATOR PROVIDES A
HIGH FREQUENCY 1-BIT DATA
STREAM (THE OUTPUT OF WHICH
IS ALSO CHOPPED) TO THE
DIGITAL FILTER,
THE DUTY CYCLE OF WHICH
REPRESENTS THE SAMPLED
ANALOG INPUT VOLTAGE.
-
MODULATOR
PROGRAMMABLE DIGITAL
FILTER
THE SINC3 FILTER REMOVES
QUANTIZATION NOISE INTRODUCED
BY THE MODULATOR. THE UPDATE
RATE AND BANDWIDTH OF THIS
FILTER ARE PROGRAMMABLE
VIA THE SF SFR.
THE OUPUT WORD FROM THE
DIGITAL FILTER IS SCALED BY
THE CALIBRATION
COEFFICIENTS BEFORE
BEING PROVIDED AS
THE CONVERSION RESULT.
OUTPUT SCALING
ANALOG INPUT CHOPPING
THE INPUTS ARE ALTERNATELY
REVERSED THROUGH THE
CONVERSION CYCLE. CHOPPING
YIELDS EXCELLENT ADC
OFFSET AND OFFSET DRIFT
PERFORMANCE.
DIFFERENTIAL REFERENCE
THE EXTERNAL REFERENCE INPUT
TO THE ADuC834 IS DIFFERENTIAL
AND FACILITATES RATIOMETRIC
OPERATION. THE EXTERNAL
REFERENCE VOLTAGE IS SELECTED
VIA THE XREF1 BIT IN ADC1CON.
REFERENCE DETECT
CIRCUITRY TESTS FOR OPEN OR
SHORTED REFERENCE INPUTS.
ANALOG MULTIPLEXER
A DIFFERENTIAL MULTIPLEXER
ALLOWS SELECTION OF THREE
EXTERNAL SINGLE ENDED INPUTS
OR THE ON-CHIP TEMP. SENSOR.
THE MULTIPLEXER IS CONTROLLED
VIA THE CHANNEL SELECTION
BITS IN ADC1CON.
Figure 8. Auxiliary ADC Block Diagram
Auxiliary ADC
The auxiliary ADC is intended to convert supplementary inputs
such as those from a cold junction diode or thermistor. This ADC
is not buffered and has a fixed input range of 0 V to 2.5 V
(assuming an external 2.5 V reference). The single-ended inputs
can be driven from AIN3, AIN4, or AIN5 Pins, or directly from
the on-chip temperature sensor voltage. A block diagram of the
auxiliary ADC is shown in Figure 8.
Analog Input Channels
The primary ADC has four associated analog input pins (labelled
AIN1 to AIN4) that can be configured as two fully differential input
channels. Channel selection bits in the ADC0CON SFR detailed
in Table VI allow three combinations of differential pair selection
as well as an additional shorted input option (AIN2–AIN2).
The auxiliary ADC has three external input pins (labelled AIN3 to
AIN5) as well as an internal connection to the on-chip temperature
sensor. All inputs to the auxiliary ADC are single-ended inputs
referenced to the AGND on the part. Channel selection bits in
the ADC1CON SFR previously detailed in Table VII allow
selection of one of four inputs.
Two input multiplexers switch the selected input channel to the
on-chip buffer amplifier in the case of the primary ADC and
directly to the
-
modulator input in the case of the auxiliary
ADC. When the analog input channel is switched, the settling
time of the part must elapse before a new valid word is available
from the ADC.
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