參數(shù)資料
型號(hào)： EVAL-AD7731EBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 41/44頁(yè)
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD7731
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 6.4k
數(shù)據(jù)接口： 串行
輸入范圍： ±1.28 V
在以下條件下的電源（標(biāo)準(zhǔn)）： 67.5mW @ 6.4kSPS
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7731
已供物品： 板，CD
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更多...
AD7731
–6–
REV. 0
SIGMA-
DELTA
MODULATOR
AD7731
SERIAL INTERFACE
AND CONTROL LOGIC
REGISTER BANK
CLOCK
GENERATION
PROGRAMMABLE
DIGITAL
FILTER
SIGMA-DELTA A/D CONVERTER
BUFFER
PGA
AGND
AVDD
AIN1
AIN2
AIN3/D1
AIN4/D0
STANDBY
SYNC
MCLK IN
MCLK OUT
SCLK
CS
DIN
DOUT
RESET
RDY
POL
DGND
AGND
AVDD
DVDD
REF IN(–) REF IN(+)
MUX
AIN5
AIN6
CALIBRATION
MICROCONTROLLER
REGISTER BANK
TWELVE REGISTERS CONTROL
ALL FUNCTIONS ON THE PART
AND PROVIDE STATUS
INFORMATION AND
CONVERSION RESULTS
SEE PAGE 20
CALIBRATION
MICROCONTROLLER
THE AD7731 OFFERS A
NUMBER OF DIFFERENT
CALIBRATION OPTIONS
INCLUDING SELF AND
SYSTEM CALIBRATION
SEE PAGE 28
*SPI IS A TRADEMARK OF MOTOROLA, INC.
BUFFER AMPLIFIER
THE BUFFER AMPLIFIER
PRESENTS A HIGH
IMPEDANCE INPUT STAGE
FOR THE ANALOG INPUTS
ALLOWING SIGNIFICANT
EXTERNAL SOURCE
IMPEDANCES
SEE PAGE 23
BURNOUT CURRENTS
TWO 100nA BURNOUT
CURRENTS ALLOW THE
USER TO EASILY DETECT
IF A TRANSDUCER HAS
BURNT OUT OR GONE
OPEN-CIRCUIT
SEE PAGE 23
PROGRAMMABLE GAIN
AMPLIFIER
THE PROGRAMMABLE
GAIN AMPLIFIER ALLOWS
SEVEN UNIPOLAR AND
SEVEN BIPOLAR INPUT
RANGES FROM +20mV TO
+1.28V
SEE PAGE 23
DIFFERENTIAL
REFERENCE
THE REFERENCE INPUT TO THE
PART IS DIFFERENTIAL AND
FACILITATES RATIOMETRIC
OPERATION. THE REFERENCE
VOLTAGE CAN BE SELECTED TO
BE NOMINALLY +2.5V OR +5V.
REFERENCE DETECT CIRCUITRY
TESTS FOR OPEN OR SHORTED
REFERENCES
SEE PAGE 24
SIGMA-DELTA ADC
THE SIGMA-DELTA
ARCHITECTURE ENSURES
24 BITS NO MISSING
CODES. THE ENTIRE
SIGMA-DELTA ADC CAN BE
CHOPPED TO REMOVE
DRIFT ERRORS
SEE PAGE 24
PROGRAMMABLE
DIGITAL FILTER
TWO STAGE FILTER THAT
ALLOWS PROGRAMMING OF
OUTPUT UPDATE RATE AND
SETTLING TIME AND THAT
HAS A FASTSTEPTM MODE
(SEE FIGURE 3)
SEE PAGE 24
STANDBY MODE
THE STANDBY MODE
REDUCES POWER
CONSUMPTION TO 50 W
SEE PAGE 32
CLOCK OSCILLATOR
CIRCUIT
THE CLOCK SOURCE FOR THE
PART CAN BE PROVIDED BY
AN EXTERNALLY-APPLIED
CLOCK OR BY CONNECTING A
CRYSTAL OR CERAMIC
RESONATOR ACROSS THE
CLOCK PINS
SEE PAGE 31
SERIAL INTERFACE
SPI*-COMPATIBLE OR DSP-
COMPATIBLE SERIAL
INTERFACE THAT CAN BE
OPERATED FROM JUST THREE
WIRES. ALL FUNCTIONS ON THE
PART (APART FROM MASTER
RESET) CAN BE ACCESSED VIA
THE SERIAL INTERFACE
SEE PAGE 33
OUTPUT DRIVERS
THE AIN3 AND AIN4 INPUT
CHANNELS CAN BE
RECONFIGURED TO BECOME
TWO OUTPUT DIGITAL PORT
LINES THAT CAN BE
PROGRAMMED OVER THE
SERIAL INTERFACE
SEE PAGE 32
ANALOG MULTIPLEXER
A DIFFERENTIAL MULTIPLEXER
ALLOWS SELECTION OF THREE
FULLY DIFFERENTIAL PAIRS OR
FIVE PSEUDO-DIFFERENTIAL INPUT
PAIRS TO BE SWITCHED TO THE
BUFFER AMPLIFIER. THE
MULTIPLEXER IS CONTROLLED
VIA THE SERIAL INTERFACE
SEE PAGE 23
Figure 2. Detailed Functional Block Diagram
REV. A
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