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參數(shù)資料
| 型號： | AD8099ARDZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Ultralow Distortion, High Speed 0.95 nV/Hz Voltage Noise Op Amp |
| 中文描述： | OP-AMP, 500 uV OFFSET-MAX, PDSO8 |
| 封裝： | LEAD FREE, MS-012, SOIC-8 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 1208K |
| 代理商： | AD8099ARDZ-REEL |
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AD8099
APPLICATIONS
USING THE AD8099
The AD8099 offers unrivaled noise and distortion performance
in low signal gain configurations. In low gain configurations
(less than15), the AD8099 requires external compensation. The
amount of gain and performance needed will determine the
compensation network.
Rev. B | Page 16 of 28
Understanding the subtleties of the AD8099 gives the user
insight on how to exact its peak performance. Use the
component values and circuit configurations shown in the
Applications section as starting points for designs. Specific
circuit applications will dictate the final configuration and value
of your components.
CIRCUIT COMPONENTS
The circuit components are referenced in Figure 59, the
recommended noninverting circuit schematic for the AD8099.
See Table 4 for typical component values and performance data.
1
8
4
7
5
3
6
2
AD8099
C5
0.1
μ
F
C
C
C
F
C1
C4
10
μ
F
C2
10
μ
F
C3
0.1
μ
F
R
C
R
F
R
G
R
S
R1
+V
S
–V
S
V
OUT
DISABLE
0
V
IN
Figure 59. Wideband Noninverting Gain Configuration (SOIC)
R
F
and R
G
—
The feedback resistor and the gain set resistor
determine the noise gain of the amplifier; typical R
F
values
range from 250 to 499 .
C
F
—Creates a zero in the loop response to compensate the pole
created by the input capacitance (including stray capacitance)
and the feedback resistor R
F
. C
F
helps reduce high frequency
peaking and ringing in the closed-loop response. Typical range
is 0.5 pF to 1.5 pF for evaluation circuits used here.
R1
—This resistor terminates the input of the amplifier to the
source resistance of the signal source, typically 50 . (This is
application specific and not always required.)
R
S
—Many high speed amplifiers in low gain configurations
require that the input stage be terminated into a nominal
impedance to maintain stability. The value of R
S
should be kept
to 50 or lower to maintain low noise performance. At higher
gains, R
S
may be reduced or even eliminated. Typical range is
0 to 50 .
C
C
—The compensation capacitor decreases the open-loop gain
at higher frequencies where the phase is degrading. By decreas-
ing the open-loop gain here, the phase margin is increased and
the amplifier is stabilized. Typical range is 0 pF to 5 pF. The
value of C
C
is gain dependent.
R
C
—
The series lead inductance of the package and the com-
pensation capacitance (C
C
) forms a series resonant circuit. R
C
dampens this resonance and prevents oscillations. The
recommended value of R
C
is 50 for a closed-loop gain of 2.
This resistor introduces a zero in the open-loop response and
must be kept low so that this zero occurs at a higher frequency.
The purpose of the compensation network is to decrease the
open-loop gain. If the resistance becomes too large, the gain will
be reduced to the resistor value, and not necessarily to 0 ,
which is what a single capacitor would do over frequency.
Typical value range is 0 to 50 .
C1
—To lower the impedance of R
C
, C1 is placed in parallel with
R
C
. C1 is not required, but greatly reduces peaking at low
closed-loop gains. The typical value range is 0 pF to 2 pF.
C2 and C3
—Bypass capacitors are connected
between
both
supplies for optimum distortion and PSRR performance. These
capacitors should be placed as close as possible to the supply
pins of the amplifier. For
C3, C5
,
a 0508 case size should be
used. The 0508 case size offers reduced inductance and better
frequency response.
C4 and C2
—Electrolytic bypass capacitors.
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