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參數(shù)資料
| 型號(hào)： | OPA2369AIDGKRG4 |
| 英文描述： | 1.8V, 1レA max, Zer┆-Crossover RAIL-TO-RAIL I/O OPERATIONAL AMPLIFIER |
| 中文描述： | 1.8，1レ阿最大，澤爾┆-交叉軌至軌I / O運(yùn)算放大器 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大小： | 644K |
| 代理商： | OPA2369AIDGKRG4 |
www.ti.com
APPLICATION INFORMATION
5k
W
OPA369
10mA max
+5V
V
IN
V
OUT
I
OVERLOAD
Current-limiting resistor
required if input voltage
exceeds supply rails by
3
0.5V.
NOISE
Although micropower amplifiers frequently have high
wideband noise, the OPA369 series offers excellent
noise performance. The OPA369 has only 2.8
μ
V
PP
of
0.1Hz to 10Hz noise, and 80nV/Hz of wideband
noise. Resistors should be chosen carefully, because
they can become the dominant source of noise.
OPERATING VOLTAGE
OPA369 series op amps are fully specified and tested
from
+1.8V
to
+5.5V.
significantly with supply voltage are shown in the
Typical Characteristic
curves.
CAPACITIVE LOAD AND STABILITY
Follower configurations with load capacitance in
excess of approximately 50pF can produce extra
overshoot and ringing in the output signal (see
Figure 19
). Increasing the gain enhances the ability of
the amplifier to drive greater capacitive loads. In
unity-gain configurations, capacitive load drive can be
improved by inserting a small (10
to 20
) resistor,
R
S
, in series with the output, as shown in
Figure 24
.
This
resistor
significantly
maintaining dc performance for purely capacitive
loads. However, if there is a resistive load in parallel
with the capacitive load, a voltage divider is created,
introducing a dc error at the output and slightly
reducing the output swing. The error introduced is
proportional to the ratio R
S
/R
L
, and is generally
negligible.
INPUT COMMON-MODE VOLTAGE RANGE
The OPA369 family is designed to eliminate the input
offset transition region typically present in most
rail-to-rail
complementary
amplifiers,
which
allows
amplifiers
to
provide
performance over the entire input range.
PROTECTING INPUTS FROM
OVER-VOLTAGE
Input currents are typically 10pA. However, large
inputs (greater than 500mV beyond the supply rails)
can cause excessive current to flow in or out of the
input pins. Therefore, in addition to keeping the input
voltage between the supply rails, it is also important
to limit the input current to less than 10mA. This
limiting is easily accomplished with an input resistor,
as shown in
Figure 23
.
10
20
W
to
W
OPA369
V+
V
IN
V
OUT
R
S
R
L
C
L
OPA369
OPA2369
SBOS414A–AUGUST 2007–REVISED SEPTEMBER 2007
The
minimizes power
supply voltages as
rejection ratio (PSRR), common-mode rejection ratio
(CMRR), and open-loop gain (A
OL
) typical values are
in the range of 100dB or better.
OPA369
family
consumption
low
of
operational
and
as
1.8V.
amplifiers
operates
Power-supply
on
When designing for ultralow power, choose system
components
carefully.
consumption, select large-value resistors. However,
note
that
large
resistors
capacitance in the circuit and the input capacitance of
the
operational
amplifier.
combinations can affect the stability of the overall
system. A feedback capacitor may be required to
assure stability and limit overshoot or gain peaking.
To
minimize
current
will
react
with
stray
Figure 23. Input Current Protection for Voltages
Exceeding the Supply Voltage
These
parasitic
RC
Good layout practice and use of a 0.1
μ
F bypass
capacitor placed closely across the supply pins are
mandatory.
Parameters
that
vary
stage
OPA369
operational
family
common-mode
the
superior
of
reduces
ringing
while
The
OPA369 family typically extends to each supply rail.
CMRR is specified from the negative rail to the
positive rail. See
Figure 4
the
Normalized Offset
Voltage vs Common-Mode Voltage
.
input
common-mode
voltage
range
of
the
Figure 24. Series Resistor in Unity-Gain Buffer
Configuration Improves Capacitive Load Drive
Copyright 2007, Texas Instruments Incorporated
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Product Folder Link(s):
OPA369 OPA2369
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| OPA2369AIDGKT | 功能描述:運(yùn)算放大器 - 運(yùn)放 1.8V 1uA max 0-C/O Rail-to-Rail I/O RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA2369AIDGKTG4 | 功能描述:運(yùn)算放大器 - 運(yùn)放 1.8V 1uA max 0-C/O Rail-to-Rail I/O RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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