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參數(shù)資料
| 型號： | LPV531MK |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Programmable Micropower CMOS Input, Rail-to-Rail Output Operational Amplifier |
| 中文描述： | OP-AMP, 5000 uV OFFSET-MAX, 4.6 MHz BAND WIDTH, PDSO6 |
| 封裝： | TSOT-23, 6 PIN |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 955K |
| 代理商： | LPV531MK |
Application Information
(Continued)
2. Switched Discrete Power Modes
In this typical application, the LPV531 can operate at two (or
more) power modes in order to fulfill the demands of the
design. One of the modes is used to save power. It is a low
power mode which is set by using a large resistor. The
others are the higher power modes which are set by one or
more smaller resistors. The larger resistor that sets the low
power mode can be permanently connected while the
smaller resistor(s) can be switched in parallel to set the high
power mode(s). This configuration allows the designer to get
the required performance from the LPV531 when needed.
The switches shown in
Figure 3
can be easily implemented
with an open drain I/O port of an ASIC or any other simple
pull down switch.
3. DAC Controlled Power Modes
For voltage controlled filter applications, where control of the
gain bandwidth is essential, a DAC and a resistive voltage
divider can be used. In this application the current drawn
from the I
pin is controlled by the DAC. The DAC’s total
output range is divided to match the V
to V
INT
voltage which
has the range of 0-110 mV.
The output of the resistive voltage divider should have an
impedance that is small compared to the value of R
INT
to
allow a linear control of the power level. Therefore, R
needs to have a value in the order of R
/10 and
R
= 125 mV * R
/V
. For 1 μA power
mode operation, these resistor values will divide the maxi-
mum voltage of V
CONTROL
to 125 mV.
DETERMINING THE R
EXT
VALUES AND I
SEL
LEVELS
To determine the value of R
EXT
that is needed for a certain
supply current or bandwidth, the following equations can be
used:
or
For the power modes characterized in this datasheet, these
formulas lead to the values in
Table 1
. These values deviate
slightly from the typical values presented in the electrical
characteristic tables. The values in
Table 1
are calculated
using approximated linear equations while the values in the
Electrical Characteristics table are the result of characteriza-
tion measurement procedures.
TABLE 1. Values for Characterized
Power Modes
R
EXT
I
SEL
Supply Current
Gain Bandwidth
Product
4.6 MHz
460 kHz
60 kHz
1
9 μA
0.9 μA
99 nA
400 μA
40 μA
5.3 μA
100 k
1 M
To calculate the R
EXT
which will allow the LPV531 to deliver
a minimum output current at all times and over all tempera-
tures, use the following equations:
If the output has to be kept at V
+
/2 for a known load resis-
tance, the required R
EXT
can be calculated with the following
equations:
20132363
FIGURE 3. Power Modes Set by Resistors and
Switches
20132364
FIGURE 4. DAC Controlled Power Mode Configurations
L
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