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参数资料
| 型号： | EVAL-AD7738EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 20/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7738 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 15.4k |
| 数据接口： | 串行 |
| 输入范围： | ±2.5 V |
| 在以下条件下的电源（标准）： | 85mW @ 5V |
| 工作温度： | -40°C ~ 105°C |
| 已用 IC / 零件： | AD7738 |
| 已供物品： | 板 |
| 相关产品： | AD7738BRUZ-REEL7-ND - IC ADC 24BIT 8CH SIG-DEL 28TSSOP AD7738BRUZ-REEL-ND - IC ADC 24BIT 8CH SIG-DEL 28TSSOP AD7738BRUZ-ND - IC ADC 24BIT 8-CH 28-TSSOP AD7738BRU-REEL7-ND - IC ADC 24BIT 8CH SIG-DEL 28TSSOP AD7738BRU-ND - IC ADC 24BIT 8-CH 28-TSSOP |
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REV. 0
AD7738
–27–
CALIBRATION
The AD7738 provides zero-scale self-calibration, and zero and
full system calibration capability, which can effectively reduce
the offset error and gain error to the order of the noise. After
each conversion, the ADC conversion result is scaled using the
ADC Calibration Registers and the relevant Channel Calibration
registers before being written to the Data register. See the equa-
tions shown below.
For unipolar ranges:
Data = ((ADC result – ADC ZS Cal. reg.)
ADC FS reg./
200000h – Ch. ZS Cal. reg.)
Ch. FS Cal. reg./200000h
For bipolar ranges:
Data = ((ADC result – ADC ZS Cal. reg.)
ADC FS reg./
400000h + 800000h – Ch. ZS Cal. reg.)
Ch. FS Cal. reg./
200000h
Where the ADC result is in the range of 0 to FFFFFFh.
Note that the Channel ZS Calibration register has the format of
a sign bit + 22 bits Channel offset value.
It is strongly recommended that the user does not change the
ADC FS register.
To start any calibration, write the relevant mode bits to the
AD7738 Mode register. After the calibration is complete, the
contents of the corresponding Calibration registers are updated, all
RDY bits in the ADC Status register are set, the
RDY pin goes
low, and the AD7738 reverts to Idle mode.
The calibration duration is the same as conversion time configured
on the selected channel. The longer conversion time gives less
noise and yields a more exact calibration. Therefore, use at least
the default conversion time to initiate any calibration.
ADC Zero-Scale Self-Calibration
The ADC Zero-Scale Self-Calibration can effectively remove
the offset error in Chopping Disabled mode. If repeated after a
temperature change, it can also remove the offset drift error in
Chopping Disabled mode.
The zero-scale self-calibration is performed on internally shorted
ADC inputs. The negative Analog Input terminal on the selected
channel is used to set the ADC ZS Calibration common mode.
Therefore, either the negative terminal on selected differential pair
or AINCOM on single-ended channel configuration should be
driven to a proper commwon-mode voltage.
It is strongly recommended that the ADC ZS Calibration register
should only be updated as part of a zero-scale self-calibration.
Per Channel System Calibration
If the per channel system calibrations are used, these should be
initiated in the following order: first a Channel ZS System Cali-
bration followed by a Channel FS System Calibration.
The System Calibration is affected by the ADC ZS and FS Cali-
bration registers; therefore, if both Self-Calibration and System
Calibration are used in a system, an ADC Self-Calibration cycle
should be performed first followed by a System Calibration cycle.
While executing a system calibration, the fully settled system
zero-scale voltage signal or system full-scale voltage signal must
be connected to the selected channel analog inputs.
The per channel Calibration registers can be read, stored, or
modified and written back to the AD7738. Note, when writing
the Calibration registers the AD7738 must be in the idle mode.
Note that outside the specified calibration range, the calibration
is possible but the performance may degrade. (See the System
Calibration section in the specification pages of this data sheet.)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-AD7739EB | 制造商:Analog Devices 功能描述:EVALUATION BOARD I.C. - Bulk |
| EVAL-AD7739EBZ | 功能描述:BOARD EVAL FOR AD7739 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD7741/42EB | 制造商:Analog Devices 功能描述:Evaluation Board For Single And Multi-Channel Synchronous Voltage-To-Frequency Converters 制造商:Analog Devices 功能描述:EVALUATION BOARD IC - Bulk |
| EVAL-AD7741/42EBZ | 功能描述:BOARD EVAL FOR AD7741/7742 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081 |
| EVAL-AD7741-42EBZ | 制造商:AD 制造商全称:Analog Devices 功能描述:Single and Multichannel, Synchronous Voltage-to-Frequency Converters |
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