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參數資料
| 型號： | ADA4899-1 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp |
| 中文描述： | 單位增益穩定，內華達州超低失真1 / Hz的電壓噪聲，高速運算放大器 |
| 文件頁數： | 14/20頁 |
| 文件大小： | 496K |
| 代理商： | ADA4899-1 |
ADA4899-1
APPLICATIONS
UNITY GAIN OPERATION
The ADA4899-1 schematic for unity gain configuration is
nearly a textbook example (see Figure 46). The only exception is
the small 24.9 Ω series resistor at the noninverting input. The
series resistor is only required in unity gain configurations;
higher gains negate the need for the resistor. In Table 4, it can be
seen that the overall noise contribution of the amplifier and the
24.9 Ω resistor is equivalent to the noise of a single 87 Ω resistor.
Rev. A | Page 14 of 20
Figure 47 shows the small signal frequency response for the
unity gain amplifier shown in Figure 46.
0
V
OUT
+V
S
–V
S
0.1μF
24.9
V
IN
0.1μF
Figure 46. Unity Gain Schematic
0
10000
1
100
10
1000
–12
–9
–6
–3
0
3
G = +1
R
L
= 100
C
FREQUENCY (MHz)
25mV p-p
50mV p-p
200mV p-p
100mV p-p
Figure 47. Small Signal Frequency Response for Various Output Voltages
RECOMMENDED VALUES FOR VARIOUS GAINS
Table 4 provides a handy reference for determining various
gains and associated performance. For noise gains greater than
one, the series resistor R
S
is not required. Resistors R
F
and R
G
are kept low to minimize their contribution to the overall noise
performance of the amplifier.
Table 4. Conditions: V
S
= ±5 V, T
A
= 25°C, R
L
= 1 kΩ
Gain
+1
1
+2
+5
+10
R
F
(Ω)
0
100
100
200
453
R
G
(Ω)
NA
100
100
49.9
49.9
R
S
(Ω)
24.9
0
0
0
0
3 dB SS BW (MHz)
(25 mV p-p)
605
294
277
77
37
Slew Rate (V/μs)
(2 V Step)
274
265
253
227
161
ADA4899-1 Voltage
Noise (nV/√Hz)
1
2
2
5
10
Total Voltage
Noise (nV/√Hz)
1.2
2.7
2.7
6.5
13.3
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相關代理商/技術參數 |
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