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| 型號： | AD8011AR-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | 300 MHz, 1 mA Current Feedback Amplifier |
| 中文描述： | OP-AMP, 6000 uV OFFSET-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 219K |
| 代理商： | AD8011AR-REEL |
AD8011
REV. B
–11–
1E+03 1E+04 1E+05 1E+06 1E+07 1E+08 1E+09
FREQUENCY
–
Hz
400
370
340
310
280
220
190
250
R
–
20
P
–
0
–
20
–
40
–
120
160
130
100
–
140
–
160
–
180
–
60
–
80
–
100
SERIES 1
IMPEDANCE
Z
I
(s)
SERIES 2
PHASE
Figure 32. Open-Loop Inverting Input Impedance
Z
I
(s) goes positive real and approaches 1/2 g
mf
as
ω
approaches
(g
mc
×
R1
–
1)
/τ1
. This results in the input resistance for the
A
V
(s) complex term being 1/2 g
mf
; the parallel thermal emitter
resistances of Q3/Q4. Using the computed CLBW from A
V
(s)
above and the nominal design values for the other parameters,
results in a closed loop 3 dB BW equal to the open loop corner
frequency (1/2
πτ
1) times 1/[G/(2 g
mf
×
T
O
) + R
F
/T
O
]. For a
fixed R
F
, the 3 dB BW is controlled by the R
F
/T
O
term for low
gains and G/(2 g
mf
×
T
O
) for high gains. For example, using
nominal design parameters and R
1
= 1 k
(which results in a
nominal T
O
of 1.2 M
, the computed BW is 80 MHz for G = 0
(inverting I-V mode with R
N
removed) and 40 MHz for
G = +10/
–
9.
DRIVING CAPACITIVE LOADS
The AD8011 was designed primarily to drive nonreactive loads.
If driving loads with a capacitive component is desired, best
settling response is obtained by the addition of a small series
resistance as shown in Figure 33. The accompanying graph
shows the optimum value for R
SERIES
vs. capacitive load. It is
worth noting that the frequency response of the circuit when
driving large capacitive loads will be dominated by the passive
roll-off of R
SERIES
and C
L
.
1k
R
L
1k
C
L
R
SERIES
1k
AD8011
Figure 33. Driving Capacitive Load
where R1 is the input resistance to A2/A2B, and
τ1
(equal to
CD
×
R1
×
A2) is the open loop dominate time constant.
and T
O
(
s
)
=
|
A
2|
×
R
1
2
s
τ
1
+
1
1E+03 1E+04 1E+05 1E+06 1E+07 1E+08 1E+09
FREQUENCY
–
Hz
140
120
100
80
60
20
0
40
G
–
0
P
–
–
40
–
80
–
120
–
160
–
200
–
240
–
280
PHASE
GAIN
T
O
(s)
Figure 31. Open-Loop Transimpedance Gain
Note that the ac open-loop plots in Figures 31, 32 and 33 are
based on the full Spice AD8011 simulations and do not include
external parasitics (see below). Nevertheless, these ac loop equa-
tions still provide a good approximation to simulated and actual
performance up to the CLBW of the amplifier. Typically g
mc
×
R1 is
–
4, resulting in A
O
(s) having a right half plane pole. In the
time domain (inverse Laplace of A
O
) it appears as unstable,
causing V
O
to exponentially rail out of its linear region. When
the loop is closed however, the BW is greatly extended and the
transimpedance gain, T
O
(s)
“
overrides
”
and directly controls
the amplifiers stability behavior due to Z
I
approaching 1/2 g
mf
for s>>1/
τ
1. See Figure 32. This can be seen by the Z
I
(s) and
A
V
(s) noninverting transfer equations below.
ZI
(
s
)
=
(1
–
gmc
×
R
1)
S
τ
1
1
–
gmc
×
R
1
+
1
2
×
gmf
(
S
τ
1
+
1)
A
V
(
s
)
=
G
1
+
G
A
O
+
R
F
T
O
S
τ
1
G
2
g
mf
T
O
+
R
F
T
O
+
1
相關PDF資料 |
PDF描述 |
|---|---|
| AD8011 | 300 MHz, 1 mA Current Feedback Amplifier |
| AD8011* | Micropower Op Amp, Comparator and Reference; Package: MSOP; No of Pins: 8; Temperature Range: 0°C to +70°C |
| AD8011-EB | 300 MHz, 1 mA Current Feedback Amplifier |
| AD8011AN | 300 MHz, 1 mA Current Feedback Amplifier |
| AD8011AR | 300 MHz, 1 mA Current Feedback Amplifier |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD8011AR-REEL7 | 功能描述:IC OPAMP CF LP LDIST 30MA 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SO 包裝:帶卷 (TR) |
| AD8011ARZ | 功能描述:IC OPAMP CF LP LDIST 30MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉換速率: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 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD8011ARZ | 制造商:Analog Devices 功能描述:Operational Amplifier (Op-Amp) IC 制造商:Analog Devices 功能描述:IC, OP-AMP, 300MHZ, 3500V/ us, SOIC-8 |
| AD8011ARZ | 制造商:Analog Devices 功能描述:IC AMPLIS |
| AD8011ARZ-REEL | 功能描述:IC OPAMP CF LP LDIST 30MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 其它有關文件:Automotive Product Guide 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉換速率:3 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:70µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:Digi-Reel® 其它名稱:MAX4475AUT#TG16DKR |
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