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参数资料
| 型号： | HI7190EVAL |
| 厂商： | Intersil |
| 文件页数： | 6/11页 |
| 文件大小： | 0K |
| 描述： | EVALUATION PLATFORM HI7190 |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 200k |
| 数据接口： | 串行 |
| 输入范围： | ±2.5 V |
| 在以下条件下的电源（标准）： | 15mW @ 200kSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | HI7190 |
| 已供物品： | 板 |
Application Note 9505
( 2.5 ) ? 2
ENOB = ------------------------------------------------------------
Executing the Program: Change directory (cd) into the
directory containing the 7190BTA5.EXE ?le. At the DOS
prompt type 7190BTA5 [return]. The software reminds the
user to apply power to the board before continuing. At this
point the software is menu driven and self explanatory. How-
ever, it is important that the user has read the previous sec-
tion, Software Description, before starting the evaluation.
Software Clari?cations
Resetting the DUT
Entering s from the Main Menu resets the HI7190 to its
initial state. The initial state of the HI7190 is as follows:
offset binary data coding, notch frequency of 30Hz, Self
Calibration mode, gain = 1, bipolar mode. The burn-out
current and sleep mode bits are inactive. The Serial
Interface con?guration is MSB ?rst bit positioning,
descending byte order, bidirectional I/O pin.
Writing the Control Register
Caution should be taken when writing the Control Regis-
ter via the Write Menu. The least signi?cant byte con-
tains information regarding the Serial Interface
con?guration that must be maintained when running the
software provided. To insure proper functionality of the
evaluation software, the Serial Interface must be con?g-
ured in MSB ?rst mode, descending byte order and bidi-
rectional I/O pin operation. This con?guration is
maintained by writing logic zeros into the 3 least signi?-
cant bits of the Control Register.
Invalid Inputs
Entering invalid inputs at some menu prompts will lock
up the software. Generally a CTL-C will return the user to
the DOS prompt.
Bypassing Calibration
The HI7190 calibration algorithm can be effectively
bypassed by writing all zeros into the Offset Calibration
Register and 800000 (hex) into the Positive and Nega-
tive Full Scale Calibration Registers if operating in bipo-
lar mode. If operation is in unipolar mode write all zeros
into the Offset Calibration Register and 800000 (hex) into
the Positive Full Scale Calibration Register.
Display of Data Register in Continuous Mode
Entering 2 from the Read Menu invokes a continuous read
of the Data Register. The following data is displayed: 1)
The binary output stream read from the HI7190, 2) The
binary output stream converted to hex, 3) The binary out-
put stream converted to volts, 4) The mean voltage of the
last 10 conversion results, 5) The maximum voltage result,
6) the minimum voltage result, 7) The difference between
the maximum voltage and minimum voltage, and 8) stan-
dard deviation, dynamic range and ENOB, which is
updated in groups of 10 conversions.
NOTE: The CTRL input on the keyboard is used to “normalize” the
statistical output. For example, the maximum voltage is set to 5.5V
and the minimum is set to -5.5V. The maximum/minimum results dis-
played from then on will include only those conversions read since
“normalization”.
The Dynamic Range and ENOB Equations are as follows:
2
2 2
Dynamic Range = 10log 10 --------------------------------------------------------
V RMS – V REFNOISE
Dynamic Range – 1.76
6.02
6.6
V MAX – V MIN
V RMS = -------------------------------------
? 4.452 × 10
? ( 0.275 F N )
Notch Frequency Input
When executing from the Custom Menu (of Change
V REFNOISE =
?
– 14 ?
Mode Menu) the notch frequency value must be entered
in decimal. That is, 2kHz is entered as 2000.
6
F N = Notch Frequency
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| HI7190IBZ-T | 功能描述:模数转换器 - ADC ADC 24BIT 10MHZ SIGMADELTA 20 IND RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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