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| 型号： | DC1009A-B |
| 厂商： | Linear Technology |
| 文件页数： | 19/30页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2488 |
| 软件下载： | QuikEval System |
| 设计资源： | DC1009A Design File DC1009A Schematic |
| 标准包装： | 1 |
| 系列： | Easy Drive™, QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 6.9 |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 已用 IC / 零件： | LTC2488 |
| 已供物品： | 板 |
| 相关产品： | LTC2488CDE#TRPBF-ND - IC ADC 16BIT DELTA SIG 14-DFN LTC2488IDE#TRPBF-ND - IC ADC 16BIT DELTA SIG 14-DFN LTC2488CDE#PBF-ND - IC ADC 16BIT DELTA SIG 14-DFN LTC2488IDE#PBF-ND - IC ADC 16BIT DELTA SIG 14-DFN |
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LTC2488
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APPLICATIONS INFORMATION
ness of internal auto calibration circuits begins to degrade.
This results in larger offset errors, full scale errors, and
decreased resolution (see Figures 20 to 27).
Easy Drive ADCs Simplify Measurement of High
Impedance Sensors
Delta-Sigma ADCs, with their high accuracy and high noise
immunity, are ideal for directly measuring many types
of sensors. Nevertheless, input sampling currents can
overwhelm high source impedances or low-bandwidth,
micropower signal conditioning circuits. The LTC2488
solves this problem by balancing the input currents, thus
simplifying or eliminating the need for signal conditioning
circuits.
A common application for a delta-sigma ADC is thermistor
measurement. Figure 28 shows two examples of thermistor
digitization beneting from the Easy Drive technology.
The rst circuit (applied to input channels CH0 and CH1)
uses balanced reference resistors in order to balance the
common mode input/reference voltage and balance the
differential input source resistance. If reference resistors
R1 and R4 are exactly equal, the input current is zero and
no errors result. If these resistors have a 1% tolerance,
the maximum error in measured resistance is 1.6Ω due
to a shift in common mode voltage; far less than the 1%
error of the reference resistors themselves. No amplier
is required, making this an ideal solution in micropower
applications.
Easy Drive also enables very low power, low bandwidth
ampliers to drive the input to the LTC2488. As shown
in Figure 28, CH2 is driven by the LT1494. The LT1494
has excellent DC specs for an amplier with 1.5μA supply
current (the maximum offset voltage is 150μV and the
open loop gain is 100,000). Its 2kHz bandwidth makes
it unsuitable for driving conventional delta sigma ADCs.
Adding a 1kΩ, 0.1μF lter solves this problem by providing
a charge reservoir that supplies the LTC2488 instantaneous
current, while the 1k resistor isolates the capacitive load
from the LT1494.
Conventional delta sigma ADCs input sampling current
lead to DC errors as a result of incomplete settling in the
external RC network.
The Easy Drive technology cancels the differential input
current. By balancing the negative input (CH3) with a 1kΩ,
0.1μF network errors due to the common mode input
current are cancelled.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DC1009A-C | 功能描述:BOARD DELTA SIGMA ADC LTC2486 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:Easy Drive™, QuikEval™ 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 |
| DC100A10 | 功能描述:固态继电器-工业安装 SSR DC OUTPUT 10A 90-140VAC RoHS:否 制造商:Crydom 控制电压范围:4 VDC to 32 VDC 负载电压额定值:7 VDC to 72 VDC 负载电流额定值:160 A 触点形式: 输出设备:SSR 安装风格:Panel |
| DC100A10C | 功能描述:固态继电器-工业安装 SSR DC OUTPUT 10A 90-140VAC RoHS:否 制造商:Crydom 控制电压范围:4 VDC to 32 VDC 负载电压额定值:7 VDC to 72 VDC 负载电流额定值:160 A 触点形式: 输出设备:SSR 安装风格:Panel |
| DC100A20 | 功能描述:固态继电器-工业安装 SSR DC OUTPUT 20A 90-140VAC RoHS:否 制造商:Crydom 控制电压范围:4 VDC to 32 VDC 负载电压额定值:7 VDC to 72 VDC 负载电流额定值:160 A 触点形式: 输出设备:SSR 安装风格:Panel |
| DC100A20C | 功能描述:固态继电器-工业安装 SSR DC OUTPUT 20A 90-140VAC RoHS:否 制造商:Crydom 控制电压范围:4 VDC to 32 VDC 负载电压额定值:7 VDC to 72 VDC 负载电流额定值:160 A 触点形式: 输出设备:SSR 安装风格:Panel |
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