- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄373930 > AD8031B (Analog Devices, Inc.) 2.7 V, 800 uA, 80 MHz Rail-to-Rail I/O Amplifiers PDF資料下載
參數(shù)資料
| 型號(hào)： | AD8031B |
| 廠(chǎng)商： | Analog Devices, Inc. |
| 英文描述： | 2.7 V, 800 uA, 80 MHz Rail-to-Rail I/O Amplifiers |
| 中文描述： | 2.7伏，800微安，80 MHz的軌到軌輸入/輸出放大器 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大?。?/td> | 247K |
| 代理商： | AD8031B |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)當(dāng)前第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)
AD8031/AD8032
–13–
REV. B
Output Overdrive Recovery
Output overdrive of an amplifier occurs when the amplifier
attempts to drive the output voltage to a level outside its normal
range. After the overdrive condition is removed, the amplifier
must recover to normal operation in a reasonable amount of
time. As shown in Figure 40, the AD8031/AD8032 recover
within 100 ns from negative overdrive and within 80 ns from
positive overdrive.
V
S
=
6
2.5V
V
IN
=
6
2.5V
R
L
= +1k
V
TO GND
100ns
1V
R
F
= R
G
= 2k
V
V
OUT
R
L
R
F
50
V
R
G
V
IN
Figure 40. Overdrive Recovery
Driving Capacitive Loads
Capacitive loads interact with an op amp’s output impedance to
create an extra delay in the feedback path. This reduces circuit
stability, and can cause unwanted ringing and oscillation. A
given value of capacitance causes much less ringing when the
amplifier is used with a higher noise gain.
The capacitive load drive of the AD8031/AD8032 can be in-
creased by adding a low valued resistor in series with the capaci-
tive load. Introducing a series resistor tends to isolate the
capacitive load from the feedback loop, thereby, diminishing its
influence. Figure 41 shows the effects of a series resistor on
capacitive drive for varying voltage gains. As the closed-loop
gain is increased, the larger phase margin allows for larger ca-
pacitive loads with less overshoot. Adding a series resistor at
lower closed-loop gains accomplishes the same effect. For large
capacitive loads, the frequency response of the amplifier will be
dominated by the roll-off of the series resistor and capacitive
load.
1000
10
100
0
1
4
C
CLOSED-LOOP GAIN – V/V
2
3
R
G
C
L
R
F
V
OUT
V
= +5V
200mV STEP
WITH 30% OVERSHOOT
R
S
= 20
V
R
S
= 0
V
, 5
V
1
5
R
S
= 20
V
R
S
R
S
= 0
V
R
S
= 5
V
Figure 41. Capacitive Load Drive vs. Closed-Loop Gain
Output Stage, Open-Loop Gain and Distortion vs. Clearance
from Power Supply
The AD8031 features a rail-to-rail output stage. The output
transistors operate as common emitter amplifiers, providing the
output drive current as well as a large portion of the amplifier’s
open-loop gain.
Q37
R29
300
V
Q47
Q21
Q20
Q51
Q27
Q68
Q44
Q42
Q48
Q49
Q50
Q43
C5
1.5pF
I4
25
m
A
V
OUT
Q38
I1
25
m
A
DIFFERENTIAL
DRIVE
FROM
INPUT STAGE
I5
25
m
A
I2
25
m
A
C9
5pF
Figure 39. Output Stage Simplified Schematic
The output voltage limit depends on how much current the
output transistors are required to source or sink. For applica-
tions with very low drive requirements (a unity gain follower
driving another amplifier input, for instance), the AD8031 typi-
cally swings within 20 mV of either voltage supply. As the re-
quired current load increases, the saturation output voltage will
increase linearly as I
LOAD
×
R
C
, where I
LOAD
is the required load
current and R
C
is the output transistor collector resistance. For
the AD8031, the collector resistances for both output transistors
are typically 25
. As the current load exceeds the rated output
current of 15 mA, the amount of base drive current required to
drive the output transistor into saturation will reach its limit,
and the amplifier’s output swing will rapidly decrease.
The open-loop gain of the AD8031 decreases approximately
linearly with load resistance and also depends on the output
voltage. Open-loop gain stays constant to within 250 mV of the
positive power supply, 150 mV of the negative power supply and
then decreases as the output transistors are driven further into
saturation.
The distortion performance of the AD8031/AD8032 amplifiers
differs from conventional amplifiers. Typically an amplifier’s
distortion performance degrades as the output voltage ampli-
tude increases.
Used as a unity gain follower, the AD8031/AD8032 output will
exhibit more distortion in the peak output voltage region around
V
CC
–0.7 V. This unusual distortion characteristic is caused by
the input stage architecture and is discussed in detail in the
section covering “Input Stage Operation.”
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD8031BN | 2.7 V, 800 uA, 80 MHz Rail-to-Rail I/O Amplifiers |
| AD8031BR | 2.7 V, 800 uA, 80 MHz Rail-to-Rail I/O Amplifiers |
| AD8032A | 2.7 V, 800 uA, 80 MHz Rail-to-Rail I/O Amplifiers |
| AD8032AN | 2.7 V, 800 uA, 80 MHz Rail-to-Rail I/O Amplifiers |
| AD8032AR | 2.7 V, 800 uA, 80 MHz Rail-to-Rail I/O Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8031BN | 制造商:Analog Devices 功能描述:OP Amp Single Volt Fdbk R-R I/O 制造商:Rochester Electronics LLC 功能描述:PDIP SINGLE LOW POWER OP AMP - Bulk |
| AD8031BNZ | 功能描述:IC OPAMP VF R-R LP LDIST 8DIP RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類(lèi)型:通用 電路數(shù):4 輸出類(lèi)型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱(chēng):LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD8031BR | 功能描述:IC OPAMP VF R-R LP LDIST 8SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類(lèi)型:J-FET 電路數(shù):2 輸出類(lèi)型:- 轉(zhuǎn)換速率:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| AD8031BR-REEL | 制造商:Analog Devices 功能描述:OP Amp Single Volt Fdbk R-R I/O ±6V/12V 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:SOIC SINGLE LOW POWER OP AMP - Tape and Reel |
| AD8031BR-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Single Volt Fdbk R-R I/O ±6V/12V 8-Pin SOIC N T/R |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。