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參數(shù)資料
| 型號(hào)： | AD9631 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Ultralow Distortion, Wide Bandwidth Voltage Feedback Op Amps |
| 中文描述： | 超低失真，寬帶電壓反饋運(yùn)算放大器 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大小： | 528K |
| 代理商： | AD9631 |
AD9631/AD9632
REV. A
–13–
THEORY OF OPERATION
General
The AD9631 and AD9632 are wide bandwidth, voltage feed-
back amplifiers. Since their open-loop frequency response fol-
lows the conventional 6 dB/octave roll-off, their gain bandwidth
product is basically constant. Increasing their closed-loop gain
results in a corresponding decrease in small signal bandwidth.
This can be observed by noting the bandwidth specification
between the AD9631 (gain of 1) and AD9632 (gain of 2). The
AD9631/AD9632 typically maintain 65 degrees of phase mar-
gin. This high margin minimizes the effects of signal and noise
peaking.
Feedback Resistor Choice
The value of the feedback resistor is critical for optimum perfor-
mance on the AD9631 (gain +1) and less critical as the gain in-
creases. Therefore, this section is specifically targeted at the
AD9631.
At minimum stable gain (+1), the AD9631 provides optimum
dynamic performance with R
F
= 140
. This resistor acts only
as a parasitic suppressor against damped RF oscillations that
can occur due to lead (input, feedback) inductance and parasitic
capacitance. This value of R
F
provides the best combination of
wide bandwidth, low parasitic peaking, and fast settling time.
In fact, for the same reasons, a 100–130
resistor should be
placed in series with the positive input for other AD9631
noninverting and all AD9631 inverting configurations. The cor-
rect connection is shown in Figures 57 and 58.
+V
S
–V
S
V
IN
100–130
0.1
μ
F
10
μ
F
6
7
2
4
3
0.1
μ
F
10
μ
F
R
F
R
G
R
IN
V
OUT
G = 1 + R
F
R
G
AD9631/32
R
TERM
Figure 57. Noninverting Operation
+V
S
–V
S
V
IN
100–130
0.1
μ
F
10
μ
F
6
7
2
4
3
0.1
μ
F
10
μ
F
R
F
R
G
R
TERM
V
OUT
G = – R
F
R
G
AD9631/32
R
IN
Figure 58. Inverting Operation
When the AD9631 is used in the transimpedance (I to V) mode,
such as in photodiode detection, the value of R
F
and diode ca-
pacitance (C
I
) are usually known. Generally, the value of R
F
se-
lected will be in the k
range, and a shunt capacitor (C
F
) across
R
F
will be required to maintain good amplifier stability. The
value of C
F
required to maintain optimal flatness (<1 dB Peak-
ing) and settling time can be estimated as:
[
where
ω
O
is equal to the unity gain bandwidth product of the
amplifier in rad/sec, and C
I
is the equivalent total input
capacitance at the inverting input. Typically
ω
O
= 800
×
10
6
rad/sec (see Open-Loop Frequency Response curve (Fig-
ure 17).
As an example, choosing R
F
= 10 k
and C
I
= 5 pF, requires
C
F
to be 1.1 pF (Note: C
I
includes both source and parasitic
circuit capacitance). The bandwidth of the amplifier can be es-
timated using the C
F
calculated as:
C
F
(2
ω
O
C
I
R
F
–1)/
ω
O
2
R
F
2
]
1/2
f
3
dB
1.6
2
π
R
F
C
F
R
F
V
OUT
AD9631
C
F
C
I
I
I
Figure 59. Transimpedance Configuration
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| AD9631AR | 功能描述:IC OPAMP VF ULDIST 70MA 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:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 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-SOIC 包裝:帶卷 (TR) |
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