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參數資料
型號: AD7730LBR
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: Bridge Transducer ADC
中文描述: 2-CH DELTA-SIGMA ADC, SERIAL ACCESS, PDSO24
封裝: SOIC-24
文件頁數: 6/52頁
文件大小: 497K
代理商: AD7730LBR
AD7730/AD7730L
–6–
REV. A
Figure 2. Detailed Functional Block Diagram
SIGMA-
DELTA
MODULATOR
AD7730
6-BIT
DAC
SERIAL INTERFACE
AND CONTROL LOGIC
REGISTER BANK
CLOCK
GENERATION
PROGRAMMABLE
DIGITAL
FILTER
SIGMA-DELTA A/D CONVERTER
BUFFER
PGA
AGND
AV
DD
VBIAS
AIN1(+)
AIN1(–)
AIN2(+)/D1
AIN2(–)/D0
ACX
ACX
STANDBY
SYNC
MCLK IN
MCLK OUT
SCLK
CS
DIN
DOUT
RESET
RDY
POL
DGND
AGND
AV
DD
DV
DD
REF IN(–) REF IN(+)
MUX
REFERENCE DETECT
AC
EXCITATION
CLOCK
CALIBRATION
MICROCONTROLLER
+
REGISTER BANK
THIRTEEN REGISTERS CONTROL
APROVIDE STATUS INFORMATION
AND CONVERSION RESULTS
SEE PAGE 11
STANDBY MODE
THE STANDBY MODE REDUCES
POWER CONSUMPTION TO 5
m
A
SEE PAGE 33
CLOCK OSCILLATOR
CIRCUIT
BY CONNECTING A CRYSTAL OR
CERAMIC RESONATOR ACROSS
THE CLOCK PINS
SEE PAGE 32
SERIAL INTERFACE
SPI*-COMPATIBLE OR DSP-
COJUST THREE WIRES. ALL
CAN BE ACCESSED VIA
THE SERIAL INTERFACE
SEE PAGE 35
OFFSET/TARE DAC
ALLOWS A PROGRAMMED
VOR SUBTRACTED FROM THE
ANIT IS APPLIED TO THE PGA
SEE PAGE 24
OUTPUT DRIVERS
THE SECOND ANALOG INPUT
ROUTPUT DIGITAL PORT LINES
OVER THE SERIAL INTERFACE
SEE PAGE 33
AC EXCITATION
APPLICATIONS, THE ACX
OUTPUTS PROVIDE SIGNALS
THAT CAN BE USED TO SWITCH
THEEXCITATION VOLTAGE
SEE PAGE 41
ANALOG MULTIPLEXER
THE TWO DIFFERENTIAL INPUT
CHANNELS TO THE BUFFER
AMPLIFIER. THE MULTIPLEXER IS
CONTROINTERFACE
SEE PAGE 24
DIFFERENTIAL
REFERENCE
TPART IS DIFFERENTIAL AND
VFACILITATES RATIOMETRIC
BE NOMINALLY +2.5V OR +5V
SEE PAGE 25
PROGRAMMABLE
DIGITAL FILTER
SETWO STAGE FILTER THAT
A FAST STEP MODE
(SEE FIGURE 3)
SEE PAGE 26
SIGMA DELTA ADC
ARCNO MISSING CODES. THE
ENTIRE SIGMA-DELTA ADC CAN
ERRORS
SEE PAGE
PROGRAMMABLE GAIN
AMPLIFIER
THE PROGRAMMABLE GAIN
AMPLIFIER ALLOWS FOUR
UNIPINPUT RANGES FROM
+10mV TO +80mV
SEE PAGE 24
BUFFER AMPLIFIER
THE BUFFER AMPLIFIER
IPRESEXTERNAL SOURCE
IMPEDANCES
SEE PAGE 24
BURNOUT CURRENTS
CUTO EASILY DETECT IF A
OTRANSDUCER HAS BURNT
SEE PAGE 25
+/–
*SPI IS A TRADEMARK OF MOTOROLA, INC.
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