參數(shù)資料
型號(hào): ADS8411IPFBT
英文描述: 16-BIT, 2 MSPS, UNIPOLAR INPUT, MICRO POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE
中文描述: 16位,2 MSPS的,單極輸入,微功耗采樣模數(shù)位并行接口和參考轉(zhuǎn)爐
文件頁(yè)數(shù): 19/23頁(yè)
文件大小: 778K
代理商: ADS8411IPFBT
www.ti.com
APPLICATION INFORMATION
MICROCONTROLLER INTERFACING
ADS8411 to 8-Bit Microcontroller Interface
CS
BYTE
RD
CONVST
BUSY
BDGND
+VBD
DB[15:8]
Micro
Controller
RD
GPIO
INT
10
μ
F
0.1
μ
F
Analog 5 V
0.1
μ
F
Digital 3 V
Ext Ref Input
Analog Input
+
R
A
+
-
ADS8411
0.1
F
R
1
μ
F
AGND
BDGND
GPIO
P[7:0]
GPIO
+
R
R
R
A
0.1
μ
F
1
μ
F
0.1
μ
F
10
μ
F
Analog 5 V
ADS8411
AGND
AGND
PRINCIPLES OF OPERATION
ADS8411
SLAS369B–APRIL 2002–REVISED DECEMBER 2004
Figure 29 shows a parallel interface between the ADS8411 and a typical microcontroller using the 8-bit data bus.
The BUSY signal is used as a falling-edge interrupt to the microcontroller.
Figure 29. ADS8411 Application Circuitry (using external reference)
Figure 30. Use Internal Reference
The ADS8411 is a high-speed successive approximation register (SAR) analog-to-digital converter (ADC). The
architecture is based on charge redistribution, which inherently includes a sample/hold function. See Figure 29
for the application circuit for the ADS8411.
The conversion clock is generated internally. The conversion time of 400 ns is capable of sustaining a 2-MHz
throughput.
19
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