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參數資料
| 型號： | DEM-ADS7864 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | ADC EVALUATION BOARD(ADC評估板) |
| 中文描述： | ADC的評估板（ADC的評估板） |
| 文件頁數： | 10/32頁 |
| 文件大小： | 1878K |
| 代理商： | DEM-ADS7864 |
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Analog Interface
2-2
2.1
Analog Interface
The analog circuit of the board is divided in two parts. The input buffer
represents the front-end circuit of the A/D converter. Its function is to provide
level and impedance adaptation of the input signal. The second part is a
voltage reference circuit. In addition to being the conversion reference, the
ADS7864 reference output is used for level shifting the analog input.
2.1.1
Single Supply—Input Buffer
The analog input to the DEM-ADS7864 board is comprised of six independent
OPA2350 operational amplifiers. The OPA2350 devices are powered from the
5-V analog supply, and arranged as inverting amplifiers with a gain of 1. The
internal 2.5-V reference voltage is applied to the noninverting input of the
OPA2350 devices. Figure 2
–
1 shows the analog input circuit of channel A0.
This configuration allows single ended signals of
±
2.5 V (5 Vpp) to be applied
to either input of channels A, B or C (JX pin 1 or 3 referenced to pin 2).
Differential signal inputs of
±
1.25 V (2.5 Vpp) can be applied to the channel
input pairs (JX pins 1 and 3).
Figure 2
–
1.DEM
–
ADS7864 Schematic
—
Analog Input Section
Note:
Figure 1 depicts the actual board layout. The factory configuration of the DEM-ADS7864 evaluation board does not
use
±
15 V. See section 2.1.3 for
±
15 V operation. Components marked with an asterisk (*) are not installed.
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| DEM-OPA268XN | DEM-OPA268xN - Evaluation Fixture |
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相關代理商/技術參數 |
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|---|---|
| DEM-ADS7870 | 功能描述:DEMO BOARD FOR ADS7870 RoHS:是 類別:編程器，開發系統 >> 評估板 - 模數轉換器 (ADC) 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- ADC 的數量:1 位數:12 采樣率（每秒）:94.4k 數據接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標準）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| DEM-ADS78DIP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DEM-ADS78DIP - EVALUATION FIXTURE |
| DEM-ADS807E | 功能描述:數據轉換 IC 開發工具 Demo Fixture RoHS:否 制造商:Texas Instruments 產品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| DEM-ADS80XU | 制造商:Texas Instruments 功能描述:DEMO BRD-ADS803/4/5 - Bulk |
| DEM-ADS822E | 功能描述:數據轉換 IC 開發工具 ADS82XE Eval Fixture RoHS:否 制造商:Texas Instruments 產品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
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