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| 型號： | AD8620BR-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Precision, Very Low Noise, Low Input Bias Current, Wide Bandwidth JFET Operational Amplifier |
| 中文描述： | DUAL OP-AMP, 300 uV OFFSET-MAX, 25 MHz BAND WIDTH, PDSO8 |
| 封裝： | MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大小： | 414K |
| 代理商： | AD8620BR-REEL |
REV. D
AD8610/AD8620
–15–
High Speed Instrumentation Amplifier (IN AMP)
The three op amp instrumentation amplifiers shown in Figure 28
can provide a range of gains from unity up to 1,000 or higher. The
instrumentation amplifier configuration features high common-
mode rejection, balanced differential inputs, and stable, accurately
defined gain. Low input bias currents and fast settling are achieved
with the JFET input AD8610/AD8620. Most instrumentation
amplifiers cannot match the high frequency performance of this
circuit. The circuit bandwidth is 25 MHz at a gain of 1, and close
to 5 MHz at a gain of 10. Settling time for the entire circuit is
550 ns to 0.01% for a 10 V step (gain = 10). Note that the resistors
around the input pins need to be small enough in value so that
the RC time constant they form in combination with stray circuit
capacitance does not reduce circuit bandwidth.
1/2 AD8620
U
1
V
IN2
C2
10pF
R2 1k
R4 2k
R7
2k
C4
15pF
V
OUT
R6
2k
R8 2k
V–
V+
AD8610
U2
C3
15pF
R5 2k
V
IN1
V–
V+
1/2 AD8620
U1
C5
10pF
R1 1k
RG
Figure 28. High Speed Instrumentation Amplifier
High Speed Filters
The four most popular configurations are Butterworth, Elliptical,
Bessel, and Chebyshev. Each type has a response that is optimized
for a given characteristic as shown in Table II.
In active filter applications using operational amplifiers, the
dc accuracy of the amplifier is critical to optimal filter performance.
The amplifier’s offset voltage and bias current contribute to output
error. Input offset voltage is passed by the filter, and may be
amplified to produce excessive output offset. For low frequency
applications requiring large value input resistors, bias and offset
currents flowing through these resistors will also generate an
offset voltage.
At higher frequencies, an amplifier’s dynamic response must be
carefully considered. In this case, slew rate, bandwidth, and open-
loop gain play a major role in amplifier selection. The slew rate
must be both fast and symmetrical to minimize distortion. The
amplifier’s bandwidth, in conjunction with the filter’s gain, will
dictate the frequency response of the filter. The use of a high perfor-
mance
amplifier such as the AD8610/AD8620 will minimize both
dc and ac errors in all active filter applications.
Second-Order Low-Pass Filter
Figure 29 shows the AD8610 configured as a second-order
Butterworth low-pass filter. With the values as shown, the corner
frequency of the filter will be 1 MHz. The wide bandwidth of
the AD8610/AD8620 allows a corner frequency up to tens of
megaHertz. The following equations can be used for component
selection:
.
1 414
2
π
R1
R2
C1
1
C2
1
=
=
)
=
(
)(
)(
)
=
(
)(
)(
)
UserSelected Typical Values
f
R
f
R
CUTOFF
.
0 707
CUTOFF
:
k
k
10
100
2
π
where
C1
and
C2
are in farads.
–13V
+13V
5
C2
11pF
V
IN
AD8610
U1
V
OUT
R2
10k
R1
10k
C1
22pF
Figure 29. Second-Order Low-Pass Filter
Table II. Filter Types
Type
Sensitivity
Overshoot
Phase
Amplitude (Pass Band)
Butterworth
Chebyshev
Elliptical
Bessel (Thompson)
Moderate
Good
Best
Poor
Good
Moderate
Poor
Best
Max Flat
Equal Ripple
Equal Ripple
Nonlinear
Linear
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| AD8620BRZ | 功能描述:IC OPAMP JFET 25MHZ DUAL 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 |
| AD8620BRZ-REEL | 功能描述:IC OPAMP JFET 25MHZ DUAL 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉換速率: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） 供應商設備封裝:8-SOIC 包裝:帶卷 (TR) |
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