參數(shù)資料
型號: AD8626
廠商: Analog Devices, Inc.
英文描述: Precision Low Power Single-Supply JFET Amplifier
中文描述: 精密低功耗單電源結型場效應管放大器
文件頁數(shù): 14/20頁
文件大?。?/td> 568K
代理商: AD8626
AD8627/AD8626/AD8625
The AD862x can safely withstand input voltages 15 V below
V
SY
if the total voltage between the positive supply and the input
terminal is less than 26 V. Figure 41 through Figure 43 show the
AD862x in different configurations accommodating signals
close to the negative rail. The amplifier input stage typically
maintains picoamp-level input currents across that input
voltage range.
Rev. B | Page 14 of 20
TIME (2
μ
s/DIV)
0
V
+5V
20k
10k
0V
–2.5V
V
SY
= 5V, 0V
Figure 41. Gain of Two Inverter Response to 2.5 V Step,
Centered –1.25 V below Ground
TIME (2
μ
s/DIV)
0
V
5V
60mV
20mV
0V
600
V
SY
= 5V
R
L
= 600
Figure 42. Unity Gain Follower Response to 40 mV Step,
Centered 40 mV above Ground
TIME (2
μ
s/DIV)
0
V
+5V
20k
10k
–10mV
–30mV
0V
V
SY
= 5V
Figure 43. Gain of Two Inverter Response to 20 mV Step,
Centered 20 mV below Ground
The AD862x is designed for 16 nV/√Hz wideband input voltage
noise and maintains low noise performance to low frequencies,
as shown in Figure 35. This noise performance, along with the
AD862x’s low input current and current noise, means that the
AD862x contributes negligible noise for applications with large
source resistances.
The AD862x has a unique bipolar rail-to-rail output stage that
swings within 5 mV of the rail when up to 2 mA of current is
drawn. At larger loads, the drop-out voltage increases as shown
in Figure 17 and Figure 18. The AD862x’s wide bandwidth and
fast slew rate allows it to be used with faster signals than previous
single-supply JFETs. Figure 44 shows the response of AD862x,
configured in unity gain, to a V
IN
of 20 V p-p at 50 kHz. The
FPBW of the part is close to 100 kHz.
TIME (5
μ
s/DIV)
0
V
V
SY
=
±
13V
R
L
= 600
Figure 44. Unity Gain Follower Response to 20 V, 50 kHz Input Signal
相關PDF資料
PDF描述
AD8625AR Precision Low Power Single-Supply JFET Amplifier
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