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参数资料
| 型号： | AD7798BRUZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT SIG-DEL 3CH 16TSSOP |
| 标准包装： | 96 |
| 位数： | 16 |
| 采样率（每秒）： | 470 |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 2mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 管件 |
| 输入数目和类型： | 3 个差分，单极；3 个差分，双极 |
| 产品目录页面： | 779 (CN2011-ZH PDF) |
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AD7798/AD7799
Data Sheet
Rev. B | Page 24 of 28
AVDD MONITOR
Along with converting external voltages, the ADC can be used
to monitor the voltage on the AVDD pin. When Bits CH2 to CH0
equal 1, the voltage on the AVDD pin is internally attenuated by 6,
and the resulting voltage is applied to the ∑- modulator using
an internal 1.17 V reference for analog-to-digital conversion.
This is useful because variations in the power supply voltage
can be monitored.
CALIBRATION
The AD7798/AD7799 provide four calibration modes that can
be programmed via the mode bits in the mode register. These
are internal zero-scale calibration, internal full-scale calibration,
system zero-scale calibration, and system full-scale calibration,
which effectively reduce the offset error and full-scale error to
the order of the noise. After each conversion, the ADC con-
version result is scaled using the ADC calibration registers
before being written to the data register. The offset calibration
coefficient is subtracted from the result prior to multiplication
by the full-scale coefficient.
To start a calibration, write the relevant value to the MD2 to
MD0 bits in the mode register. After the calibration is complete,
the contents of the corresponding calibration registers are
updated, the RDY bit in the status register is set, the DOUT/
RDY pin goes low (if CS is low), and the AD7798/AD7799
revert to idle mode.
During an internal zero-scale or full-scale calibration, the
respective zero-scale and full-scale input are automatically
connected internally to the ADC input pins. A system calibration,
however, expects the system zero-scale and system full-scale
voltages to be applied to the ADC pins before the calibration
mode is initiated. In this way, external ADC errors are removed.
From an operational point of view, a calibration should be
treated like an ADC conversion. A zero-scale calibration (if
required) should always be performed before a full-scale
calibration. System software should monitor the RDY bit in the
status register or the DOUT/RDY pin to determine the end of
calibration via a polling sequence or an interrupt-driven routine.
Both an internal offset calibration and system offset calibration
take two conversion cycles. An internal offset calibration is not
needed because the ADC itself removes the offset continuously.
To perform an internal full-scale calibration, a full-scale input
voltage is automatically connected to the selected analog input
for this calibration. When the gain equals 1, a calibration takes
two conversion cycles to complete. For higher gains, four
conversion cycles are required to perform the full-scale
calibration. DOUT/RDY goes high when the calibration is
initiated and returns low when the calibration is complete. The
ADC is placed in idle mode following a calibration. The measured
full-scale coefficient is placed in the full-scale register of the
selected channel. Internal full-scale calibrations cannot be
performed when the gain equals 128. A factory calibration
is performed at this gain setting, and the factory value is
automatically loaded into the full-scale register when the gain is
set to 128. With this gain setting, a system full-scale calibration
can be performed. A full-scale calibration is required each time
the gain of a channel is changed to minimize the full-scale error.
An internal full-scale calibration can only be performed at
specified update rates. For gains of 1, 2, and 4, an internal full-
scale calibration can be performed at any update rate. However,
for higher gains, internal full-scale calibrations must be performed
when the update rate is less than or equal to 16.7 Hz, 33.2 Hz,
or 50 Hz. Because the full-scale error does not vary with the
update rate, a calibration at one update rate is valid for all update
rates (assuming the gain or reference source is not changed).
A system full-scale calibration takes two conversion cycles to
complete, irrespective of the gain setting. A system full-scale
calibration can be performed at all gains and update rates. If
system offset calibrations are performed along with system full-
scale calibrations, the offset calibration should be performed
before the system full-scale calibration is initiated.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7798BRUZ-REEL | 功能描述:IC ADC 16BIT 3CH LP 16-TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD7799 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Power, 24-Bit/16-Bit Sigma-Delta ADC with In-Amp |
| AD7799BRU | 功能描述:IC ADC 24BIT 3CH LP 16-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD7799BRU-REEL | 功能描述:IC ADC 24BIT 3CH LP 16-TSSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD7799BRUZ | 功能描述:IC ADC 24BIT SIG-DEL 3CH 16TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
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