參數(shù)資料
型號(hào)： EVAL-AD7731EB
廠商： Analog Devices, Inc.
英文描述： Low Noise, High Throughput 24-Bit Sigma-Delta ADC
中文描述： 低噪聲，高吞吐量的24位Σ-Δ模數(shù)轉(zhuǎn)換器
文件頁(yè)數(shù)： 36/44頁(yè)
文件大?。?/td> 411K
代理商： EVAL-AD7731EB
AD7731
–36–
REV. 0
CONFIGURING T HE AD7731
T he AD7731 contains twelve on-chip registers which 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 and Filter 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 1 kHz Output Rate in nonCHOP
Mode*/
/* Writes to Communications Register Setting Next Operation as Write to
Mode Register*/
/* Writes to Mode Register Initiating Internal Full-Scale Calibration for
0 V to +1.28 V Input Range on Channel Pair AIN1/AIN2*/
/* 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 V to +1.28 V 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 1332 Hex to Serial Port
1
Write 02 Hex to Serial Port
Write B174 Hex to Serial Port
Wait for
RDY
Low
Write 02 Hex to Serial Port
Write 9174 Hex to Serial Port
Wait for
RDY
Low
1
T his operation is not necessary if the default values of the Filter Register are the values used in the application.
T able X X . Pseudo-Code for Looping AD7731 T hrough T hree Fully-Differential Channels
CHANNEL = 4 Hex
CH_LOOP: MODE = 2177 Hex
MODE = MODE AND CHANNEL
Write 02 Hex to Serial Port
/* Sets a Variable Called CHANNEL*/
/* Sets a Variable Called MODE */
/* Logical AND of Both Variables */
/* Writes to Communications Register Setting Next Operation as Write to
Mode Register*/
/* Writes to Mode Register Setting Continuous Conversion Mode for 0V
to +1.28 V Input Range on Channel Determined by CHANNEL Variable*/
/* Wait for
RDY
pin to go low to Indicate Output Update*/
/* Writes to Communications Register Setting Next Operation as Read
From Data Register*/
/* Read Conversion Result from AD7731’s Data Register*/
/* Increments Channel Address*/
/* Resets Channel Address*/
Write MODE to Serial Port
Wait for
RDY
Low
Write 11 Hex to Serial Port
Read 24-Bit Data From Serial Port
Increment CHANNEL
If CHANNEL = 7Hex T hen Set CHANNEL = 4 Hex
Loop to CH_LOOP
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