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| 型號(hào)： | AD8011AR |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 3/17頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP CF LP LDIST 30MA 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 98 |
| 放大器類型： | 電流反饋 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 3500 V/µs |
| -3db帶寬： | 400MHz |
| 電流 - 輸入偏壓： | 5µA |
| 電壓 - 輸入偏移： | 2000µV |
| 電流 - 電源： | 1.3mA |
| 電流 - 輸出 / 通道： | 30mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 12 V，±1.5 V ~ 6 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(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 管件 |
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REV. C
–10–
AD8011
(error current times the open-loop inverting input resistance) that
results (see Figure 7), a more exact low frequency closed-loop
transfer function can be described as
A
G
GR
T
R
T
G
A
R
T
V
I
O
F
OO
F
O
=
+
×
+
=
++
11
for noninverting (G is positive).
A
V
O
F
O
G
A
R
T
=
++
1
1 –
for inverting (G is negative).
where G is the ideal gain as previously described. With RI = TO /AO
(open-loop inverting input resistance), the second expression
(positive G) clearly relates to the classical voltage feedback op amp
equation with TO omitted due to its relatively much higher value
and thus insignificant effect. AO and TO are the open-loop dc
voltage and transresistance gains of the amplifier, respectively.
These key transfer variables can be described as
A
Rgmf
A
g
mc
R
O
=
××
×
12
1
|
( –
)
and
T
RA
O
=
×
12
2
|
Therefore
R
g
mc
R
g
mf
I
=
×
1
2
–
where gmc is the positive feedback transconductance (not shown)
and 1/gmf is the thermal emitter resistance of devices D1/D2 and
Q3/Q4. The gmc
× R1 product has a design value that results in a
negative dc open-loop gain of typically –2500 V/V (see Figure 8).
RS
LN
TO (s)
AO (s)
VP
ZI
IE
LI
RN
CP
RF
+VS
–VS
LS
RL
CL
VO
LS
Z I = OPEN LOOP INPUT IMPEDANCE = CI || RL
Figure 7. ZI = Open-Loop Input Impedance
Though atypical of conventional CF or VF amps, this negative
open-loop voltage gain results in an input referred error term
(VP–VO/G = G/AO + RF/TO) that will typically be negative for G,
greater than +3/–4. As an example, for G = 10, AO = –2500,
and TO = 1.2 M
, results in an error of –3 mV using the A
V
derivation above.
This analysis assumes perfect current sources and infinite transistor
VAs. (Q3, Q4 output conductances are assumed zero.) These
assumptions result in actual versus model open-loop voltage gain
and associated input referred error terms being less accurate for
low gain (G) noninverting operation at the frequencies below the
open-loop pole of the AD8011. This is primarily a result of the
input signal (VP) modulating the output conductances of Q3/Q4,
resulting in RI less negative than derived here. For inverting
operation, the actual versus model dc error terms are relatively
much less.
1E+03
1E+04
1E+05
1E+06
1E+07
1E+08
1E+09
80
70
60
50
40
20
10
FREQUENCY (Hz)
30
GAIN
(dB
)
–90
PHASE
(Degrees)
–100
–110
–120
–160
PHASE
GAIN
0
–10
–20
–30
–170
–180
–190
–200
–130
–140
–150
AO(s)
Figure 8. Open-Loop Voltage Gain and Phase
AC TRANSFER CHARACTERISTICS
The ac small signal transfer derivations below are based on a
simplified single-pole model. Though inaccurate at frequencies
approaching the closed-loop BW (CLBW) of the AD8011 at low
noninverting external gains, they still provide a fair approxima-
tion and an intuitive understanding of its primary ac small signal
characteristics.
For inverting operation and high noninverting gains, these
transfer equations provide a good approximation to the actual
ac performance of the device.
To accurately quantify the VO versus VP relationship, AO(s)
and TO(s) need to be derived. This can be seen by the following
nonexpanded noninverting gain relationship
Vs
V s
G
As
R
Ts
OP
O
F
O
() /
()
[]
=
++ 1
with
As
Rg
mf
A
g
mc
R
S
g
mc
R
O ()
||
–
=
××
×
12
11
1
11
τ
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
s
AR
s
O ()
||
=
×
+
21
2
11
τ
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| AD8011AR-EBZ | 功能描述:BOARD EVAL FOR AD8011AR RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 運(yùn)算放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- |
| AD8011AR-REEL | 制造商:Analog Devices 功能描述:OP Amp Single Current Fdbk ±6V/12V 8-Pin SOIC N T/R |
| 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(biāo)準(zhǔn)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(zhuǎn)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(yīng)商設(shè)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(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 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: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 |
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