參數(shù)資料
型號(hào)： AD7730BN
廠商： ANALOG DEVICES INC
元件分類： ADC
英文描述： Bridge Transducer ADC
中文描述： 2-CH 19-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDIP24
封裝： PLASTIC, DIP-24
文件頁(yè)數(shù)： 37/52頁(yè)
文件大?。?/td> 497K
代理商： AD7730BN
AD7730/AD7730L
REV. A
–37–
CONFIGURING T HE AD7730
T he AD7730 contains twelve on-chip registers that can be accessed via the serial interface. Figure 5 and Figure 6 have outlined a
flowchart for the reading and writing of these registers. T able X IX and T able X X outline sample pseudo-code for some commonly
used routines. T he required operating conditions will dictate the values loaded to the Mode, Filter and DAC Registers. T he values
given here are for example purposes only.
T able X IX . Pseudo-Code for Initiating a Self-Calibration after Power-On/Reset
Write 03 Hex to Serial Port
1
/* Writes to Communications Register Setting Next Operation as Write to
Filter Register*/
/* Writes to Filter Register Setting a 50 Hz Output Rate in CHOP Mode*/
/* Writes to Communications Register Setting Next Operation as Write to
DAC Register*/
/* Writes to DAC Register Setting a Subtraction Value of 7.5 mV (5 V Refer-
ence) on the T ARE DAC*/
/* Writes to Communications Register Setting Next Operation as Write to
Mode Register*/
/* Writes to Mode Register Initiating Internal Full-Scale Calibration for 0 mV
to +10 mV Input Range*/
/* Wait for RDY pin to go low to indicate end of calibration cycle*/
/* Writes to Communications Register Setting Next Operation as Write to
Mode Register*/
/* Writes to Mode Register Initiating Internal Zero-Scale Calibration for
0 mV to +10 mV Input Range*/
/* Wait for RDY pin to go low to indicate end of calibration cycle*/
/* T he part has now completed self-calibration and is in idle mode*/
Write 800010 Hex to Serial Port
1
Write 04 Hex to Serial Port
1
Write 23 Hex to Serial Port
1
Write 02 Hex to Serial Port
Write B180 Hex to Serial Port
Wait for RDY Low
Write 02 Hex to Serial Port
Write 9180 Hex to Serial Port
Wait for RDY Low
1
T his operation is not necessary if the default values of the Filter Register or the DAC Register are the values used in the application.
T able X X . Pseudo-Code for Setting Up AD7730 for Continuous Conversion and Continuous Read Operation
Write 02 Hex to Serial Port
/* Writes to Communications Register Setting Next Operation as Write to
Mode Register*/
/* Writes to Mode Register Starting Continuous Conversions for 0 mV to
+10 mV Input Range*/
/* Writes to Communications Register Setting Next Operation as Continuous
Read From Data Register*/
/* Ensures Part is not Reset While in Continuous Read Mode*/
/* Wait for RDY pin to go low to Indicate Output Update*/
/* Read Conversion Result from AD7730's Data Register*/
Write 2180 Hex to Serial Port
Write 21 Hex to Serial Port
Set DIN Line of AD7730 Low
READ_DAT A: Wait for RDY Low
Read 24-Bit Data From Serial Port
Loop to READ_DAT A Until All Data Gathered
Write 30 Hex to Serial Port
/* Ends Continuous Read Operation and Places Part in Mode Where It
Expects Write to Communications Register*/
相關(guān)PDF資料
PDF描述
AD7730BR Bridge Transducer ADC
AD7730BRU Bridge Transducer ADC
AD7730L Bridge Transducer ADC
AD7731 Low Noise, High Throughput 24-Bit Sigma-Delta ADC
AD7731BN Low Noise, High Throughput 24-Bit Sigma-Delta ADC
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