參數資料
型號： MCP6033
廠商： Microchip Technology Inc.
英文描述： 0.9 uA, High Precision Op Amps
中文描述： 0.9微安，高精度運算放大器
文件頁數： 15/30頁
文件大?。?/td> 870K
代理商： MCP6033
2007 Microchip Technology Inc.
DS22041A-page 15
MCP6031/2/3/4
4.2
Rail-to-Rail Output
The output voltage range of the MCP6031/2/3/4 op
amps is V
SS
+ 10 mV (minimum) and V
DD
– 10 mV
(maximum) when R
L
= 50 k
Ω
is connected to V
DD
/2
and V
DD
= 5.5V. Refer to
Figures 2-25
and
2-26
for
more information.
4.3
Output Loads and Battery Life
The MCP6031/2/3/4 op amp family has outstanding
quiescent current, which supports battery-powered
applications. There is minimal quiescent current glitch-
ing when Chip Select (CS) is raised or lowered. This
prevents excessive current draw, and reduced battery
life, when the part is turned off or on.
Heavy resistive loads at the output can cause exces-
sive battery drain. Driving a DC voltage of 2.5V across
a 100 k
Ω
load resistor will cause the supply current to
increase by 25 μA, depleting the battery 28 times as
fast as I
Q
(0.9 μA, typical) alone.
High frequency signals (fast edge rate) across capaci-
tive loads will also significantly increase supply current.
For instance, a 0.1 μF capacitor at the output presents
an AC impedance of 15.9 k
Ω
(1/2
π
fC) to a 100 Hz
sinewave. It can be shown that the average power
drawn from the battery by a 5.0 V
p-p
sinewave
(1.77 V
rms
), under these conditions, is
EQUATION 4-1:
This will drain the battery about 12 times as fast as I
Q
alone.
4.4
Capacitive Loads
Driving large capacitive loads can cause stability
problems for voltage feedback op amps. As the load
capacitance increases, the feedback loop’s phase
margin decreases and the closed-loop bandwidth is
reduced. This produces gain peaking in the frequency
response, with overshoot and ringing in the step
response. While a unity-gain buffer (G = +1) is the most
sensitive to capacitive loads, all gains show the same
general behavior.
When driving large capacitive loads with these op
amps (e.g., > 100 pF when G = +1), a small series
resistor at the output (R
ISO
in
Figure 4-3
) improves the
feedback loop’s phase margin (stability) by making the
output load resistive at higher frequencies. The
bandwidth will be generally lower than the bandwidth
with no capacitance load.
FIGURE 4-3:
stabilizes large capacitive loads.
Output resistor, R
ISO
Figure 4-4
gives recommended R
ISO
values for
different capacitive loads and gains. The x-axis is the
normalized load capacitance (C
L
/G
N
), where G
N
is the
circuit's noise gain. For non-inverting gains, G
N
and the
Signal Gain are equal. For inverting gains, G
N
is
1+|Signal Gain| (e.g., -1 V/V gives G
N
= +2 V/V).
FIGURE 4-4:
for Capacitive Loads.
Recommended R
ISO
values
After selecting R
ISO
for your circuit, double-check the
resulting frequency response peaking and step
response overshoot. Modify R
ISO
’s value until the
response is reasonable. Bench evaluation and simula-
tions with the MCP6031/2/3/4 SPICE macro model are
very helpful.
4.5
MCP6033 CHIP SELECT (CS)
The MCP6033 is a single op amp with Chip Select
(CS). When CS is pulled high, the supply current drops
to 0.4 nA (typical) and flows through the CS pin to V
SS
.
When this happens, the amplifier output is put into a
high impedance state. By pulling CS low, the amplifier
is enabled. If the CS pin is left floating, the amplifier will
not operate properly.
Figure 1-1
shows the output
voltage and supply current response to a CS pulse.
P
Supply
= (V
DD
- V
SS
) (I
Q
+ V
L(p-p)
f
C
L
)
= (5V)(0.9 μA + 5.0V
p-p
·
100Hz
·
0.1μF)
= 4.5 μW + 50 μW
V
IN
R
ISO
V
OUT
MCP603X
+
C
L
–
1000
10000
100000
100k
1000000
1.E-11
1.E-10
1.E-09
1.E-08
1.E-07
1.E-06
Normalized Load Capacitance; C
L
/G
N
(F)
R
I
)
G
N
:
1 V/V
2 V/V
≥
5 V/V
1M
相關PDF資料
PDF描述
MCP6033T 0.9 uA, High Precision Op Amps
MCP6034 0.9 uA, High Precision Op Amps
MCP6034T 0.9 uA, High Precision Op Amps
MCP604 2.7V to 5.5V Single Supply CMOS Op Amps(2.7V~5.5V單電源四運放)
MCP603 2.7V to 5.5V Single Supply CMOS Op Amps(2.7V~5.5V單電源單運放)
相關代理商/技術參數
參數描述
MCP6033-E/MC 功能描述:運算放大器 - 運放 SNGL 18V 10kHz Op Amp w/ CS E temp RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
MCP6033E/MS 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:0.9 uA, High Precision Op Amps
MCP6033-E/MS 功能描述:運算放大器 - 運放 S-1.8V 14kHz Op Amp w/ CS E temp RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
MCP6033-E/OT 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:0.9 μA, High Precision Op Amps
MCP6033E/SL 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:0.9 uA, High Precision Op Amps
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數量 廠商 批號 封裝
添加更多采購

我的聯系方式

*
*
*