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參數資料
| 型號： | ADC0802LCN |
| 廠商： | INTERSIL CORP |
| 元件分類： | ADC |
| 英文描述： | 8-Bit, Microprocessor- Compatible, A/D Converters |
| 中文描述： | 1-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, CDIP20 |
| 封裝： | CERDIP-20 |
| 文件頁數： | 33/41頁 |
| 文件大?。?/td> | 1118K |
| 代理商： | ADC0802LCN |
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Functional Description
(Continued)
Note 25:
In order for the microprocessor to service subroutines and interrupts, the stack pointer must be dimensioned in the user’s program.
For amplification of DC input signals, a major system error is
the input offset voltage of the amplifiers used for the preamp.
Figure 18 is a gain of 100 differential preamp whose offset
voltage errors will be cancelled by a zeroing subroutine
which is performed by the INS8080A microprocessor sys-
tem. The total allowable input offset voltage error for this
preamp is only 50 μV for
1
4
LSB error. This would obviously
require very precise amplifiers. The expression for the differ-
ential output voltage of the preamp is:
where I
is the current through resistor R
X
. All of the offset
error terms can be cancelled by making
±
I
R
= V
+
V
V
OS2
. This is the principle of this auto-zeroing
scheme.
The INS8080A uses the 3 I/O ports of an INS8255 Program-
able Peripheral Interface (PPI) to control the auto zeroing
and input data from the ADC0801 as shown in Figure 19
The PPI is programmed for basic I/O operation (mode 0) with
Port A being an input port and Ports B and C being output
ports. Two bits of Port C are used to alternately open or close
the 2 switches at the input of the preamp. Switch SW1 is
closed to force the preamp’s differential input to be zero dur-
ing the zeroing subroutine and then opened and SW2 is then
closed for conversion of the actual differential input signal.
Using 2 switches in this manner eliminates concern for the
ON resistance of the switches as they must conduct only the
input bias current of the input amplifiers.
Output Port B is used as a successive approximation regis-
ter by the 8080 and the binary scaled resistors in series with
each output bit create a D/A converter. During the zeroing
subroutine, the voltage at V
increases or decreases as re-
quired to make the differential output voltage equal to zero.
This is accomplished by ensuring that the voltage at the out-
put of A1 is approximately 2.5V so that a logic “1” (5V) on
SAMPLE PROGRAM FOR
Figure 17
INTERFACING MULTIPLE A/D’s IN AN MC6800 SYSTEM
DS005671-A3
SAMPLE PROGRAM FOR
Figure 17
INTERFACING MULTIPLE A/D’s IN AN MC6800 SYSTEM
DS005671-A4
A
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADC0802LCN/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 8-Bit |
| ADC0802LCN/NOPB | 功能描述:模數轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADC0802LCN-P | 功能描述:IC ADC 8BIT MPU COMPAT 20-DIP 制造商:texas instruments 系列:- 零件狀態(tài):最後搶購 位數:8 采樣率（每秒）:10k 輸入數:1 輸入類型:差分 數據接口:并聯(lián) 配置:ADC 無線電 - S/H:ADC:- A/D 轉換器數:1 架構:SAR 參考類型:外部，電源 電壓 - 電源，模擬:4.5 V ~ 6.3 V 電壓 - 電源，數字:4.5 V ~ 6.3 V 特性:- 工作溫度:- 基本零件編號:ADC0802 標準包裝:18 |
| ADC0802LCV | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 8-Bit |
| ADC0802LCWM | 制造商:Texas Instruments 功能描述: |
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