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參數(shù)資料
| 型號： | ADC1241BIJ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | ADC |
| 英文描述： | Self-Calibrating 12-Bit Plus Sign mP-Compatible A/D Converter with Sample-and-Hold |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, CDIP28 |
| 封裝： | CERAMIC, DIP-28 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 268K |
| 代理商： | ADC1241BIJ |
2.0 Functional Description
(Continued)
Digital Control Inputs
A/D Function
CS
WR
RD
CAL
AZ
1
0
1
1
X
X
1
1
1
1
1
1
1
0
0
X
X
Start Conversion without Auto-Zero
Read Conversion Result without Auto-Zero
Start Conversion with Auto-Zero
Read Conversion Result with Auto-Zero
Start Calibration Cycle
Test Mode (DB2, DB3, DB5 and DB6 become active)
1
X
1
0
FIGURE 1. Function of the A/D Control Inputs
The table in Figure 1 summarizes the effect of the digital
control inputs on the function of the ADC1241. The Test
Mode, where RD is high and CS and CAL are low, is used by
the factory to thoroughly check out the operation of the
ADC1241. Care should be taken not to inadvertently be in
this mode, since DB2, DB3, DB5, and DB6 become active
outputs, which may cause data bus contention.
2.2 RESETTING THE A/D
All internal logic can be reset, which will abort any conver-
sion in process. The A/D is reset whenever a new conver-
sion is started by taking CS and WR low. If this is done when
the analog input is being sampled or when EOC is low, the
Auto-Cal correction factors may be corrupted, therefore
making it necessary to do an Auto-Cal cycle before the next
conversion. This is true with or without Auto-Zero. The Cali-
bration Cycle cannot be reset once started. On power-up
the ADC1241 automatically goes through a Calibration Cy-
cle that takes typically 1396 clock cycles.
3.0 Analog Considerations
3.1 REFERENCE VOLTAGE
The voltage applied to the reference input of the converter
defines the voltage span of the analog input (the difference
between V
IN
and AGND), over which 4095 positive output
codes and 4096 negative output codes exist. The A-to-D
can be used in either ratiometric or absolute reference ap-
plications. The voltage source driving V
REF
must have a
very low output impedance and very low noise. The circuit in
Figure 2 is an example of a very stable reference that is
appropriate for use with the ADC1241.
In a ratiometric system, the analog input voltage is propor-
tional to the voltage used for the A/D reference. When this
voltage is the system power supply, the V
REF
pin can be
tied to V
CC
. This technique relaxes the stability requirement
of the system reference as the analog input and A/D refer-
ence move together maintaining the same output code for
given input condition.
TL/H/10554–17
*
Tantalum
FIGURE 2. Low Drift Extremely Stable Reference Circuit
11
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| ADC1241CIJ | 功能描述:IC ADC 12BIT W/S&H +SGN 28-DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| ADC1241CMJ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Self-Calibrating 12-Bit Plus Sign mP-Compatible A/D Converter with Sample-and-Hold |
| ADC1242 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| ADC1242CIJ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:12-Bit Plus Sign Sampling A/D Converter |
| ADC1243D125HD-C1 | 制造商:Integrated Device Technology Inc 功能描述:HLQFN56R - Bulk |
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