參數(shù)資料
型號(hào)： ADC1241CMJ
廠(chǎng)商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 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(yè)數(shù)： 11/14頁(yè)
文件大?。?/td> 268K
代理商： ADC1241CMJ
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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