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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： | 11/32頁 |
| 文件大小： | 1878K |
| 代理商： | DEM-ADS7864 |
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Analog Interface
2-3
Analog and Digital Interface
2.1.2
Bipolar Inputs
Table 1
–
1 lists various combinations of resistors, capacitors and jumpers
(refer to Figure 1
–
1). By changing components and setting the appropriate
jumper, it is possible to adapt the input buffer to accept bipolar input voltages.
Table 1
–
1 is related to the schematic presented in Figure 1
–
1 and represents
channel A0 of the ADC. Channels B0, C0, A1, B1and C1 follow a similar
pattern, with only the most significant digit of the reference designator
changing.
The capacitors C103 through C603 are used only in differential signal
configurations. For single-ended signals, the second operational amplifier can
be used to buffer the reference voltage to the input of A/D converter.
Table 2
–
1.Combinations of Resistors, Capacitors and Jumpers
Input
Voltage
R102
R106
R100
R104
R103
R107
R101
R105
C101
C104
C100
C102
JP100
JP101
0
5
5 k
open
open
short
330 pF
open
open
0
2.5
5 k
5 k
open
5 k
open
330 pF
1
–
2
(
–
2.5)
2.5
20 k
4 k
20 k
4 k
open
330 pF
1
–
2
(
–
5)
5
20 k
4 k
10 k
2 k
open
330 pF
1
–
2
(
–
10)
10
20 k
4 k
5 k
1 k
open
330 pF
1
–
2
(
–
5)
–
0
open
5 k
open
5 k
short
330 pF
2
–
3
0
5
open
5 k
open
5 k
short
330 pF
2
–
3
2.1.3
Dual Supply
—
Input Buffer
The DEM-ADS7864 board is configured at the factory for 5-V analog
operation. It is possible however, for the user to modify the input power circuit
to allow up to
±
15-V analog supplies. Care must be taken to ensure a proper
input buffer op-amp is used.
Caution
The OPA2350 is a single supply device; it
must
be removed prior to
changing the input voltage.
Modifying the evaluation board for dual analog supplies requires the user to
cut the wire links at JP7 and JP8. These are located near the input power
connector (J7). The user must also install a 5-V linear regulator (Texas
Instruments part number A7805CKC) at U15. This voltage is required by the
ADC as well as the internal reference circuit U7.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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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