參數(shù)資料
型號(hào)： ADC10030CIVT
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： ADC
英文描述： 10-Bit, 30 MSPS, 125 mW A/D Converter with Internal Sample and Hold
中文描述： 1-CH 10-BIT RESISTANCE LADDER ADC, PARALLEL ACCESS, PQFP32
封裝： TQFP-32
文件頁(yè)數(shù)： 13/17頁(yè)
文件大?。?/td> 417K
代理商： ADC10030CIVT
Applications Information
(Continued)
The circuit of Figure 6 may be used if it is desired to obtain
precise reference voltages. The LMC6082 in this circuit was
chosen for its low offset voltage, low voltage rail-to-rail capa-
bility and low cost.
Since the current flowing through the sense lines (those lines
associated with V
REF
+ S and V
REF
S) is essentially zero,
there is negligible voltage drop across any resistance in se-
ries with these sense pins and the voltage at the inverting in-
put of the op-amp accurately represents the voltage at the
top (or bottom) of the ladder. The op-amp drives the force in-
put, forcing the voltage at the ends of the ladder to equal the
voltage at the op-amp’s non-inverting input, plus any offset
voltage. For this reason, op-amps with low V
, such as the
LMC6081 and LMC6082, should be used for this application.
Voltages at the reference sense pins (V
+ S and V
S)
should be within the range specified in the Operating Ratings
table (2.6V to 3.8V for V
+ and 1.7V to V
- 1.2V for
V
). Any device used to drive the reference pins should
be able to source sufficient current into the V
REF
+ F pin and
sink sufficient current from the V
REF
F pin when the ladder
is at its minimum value of 850
.
The reference voltage at the top of the ladder (V
REF
+) may
take on values as low as 1.0V above the voltage at the bot-
tom of the ladder (V
) and as high as (V
1.2V). The
voltage at the bottom of the ladder (V
) may take on val-
ues as low as 1.7V and as high as 2.8V. However, to mini-
mize noise effects and ensure accurate conversions, the to-
tal reference voltage range (V
+ V
REF
) should be a
minimum of 1.0V and a maximum of 2.2V.
DS101064-19
FIGURE 5. Improved Low Component Count Reference Biasing
A
www.national.com
13
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