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| 型号： | ADA4898-2YRDZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP VF 65MHZ DL LN 8SOIC |
| 标准包装： | 2,500 |
| 放大器类型： | 电压反馈 |
| 电路数： | 1 |
| 转换速率： | 55 V/µs |
| -3db带宽： | 65MHz |
| 电流 - 输入偏压： | 100nA |
| 电压 - 输入偏移： | 20µV |
| 电流 - 电源： | 7.9mA |
| 电流 - 输出 / 通道： | 40mA |
| 电压 - 电源，单路/双路(±)： | ±4.5 V ~ 16.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 供应商设备封装： | 8-SOIC-EP |
| 包装： | 带卷 (TR) |
Data Sheet
ADA4898-1/ADA4898-2
Rev. D | Page 15 of 20
APPLICATIONS INFORMATION
HIGHER FEEDBACK RESISTOR GAIN OPERATION
The ADA4898 schematic for the noninverting gain
configuration shown in Figure 47 is nearly a textbook example.
The only exception is the feedback capacitor in parallel with
the feedback resistor, RF, but this capacitor is recommended
difference between using a 100 resistor and a 1 k feedback
resistor. Due to the high input capacitance in the ADA4898 when
using a higher feedback resistor, more peaking appears in the
closed-loop gain. Using the lower feedback resistor resolves this
issue; however, when running at higher supplies (±15 V) with
an RF of 100 , the system draws a lot of extra current into the
feedback network. To avoid this problem, a higher feedback
resistor can be used with a feedback capacitor in parallel. Figure 48
shows the effect of placing a feedback capacitor in parallel with
a larger RF. In this gain-of-2 configuration, RF = RG = 1 k and
CF = 2.7 pF. When using CF, the peaking drops from 6 dB to less
than 2 dB.
07037-
043
VIN
VOUT
10F
+VS
–VS
RT
RL
+
10F
+
CF
RF
0.1F
Figure 47. Noninverting Gain Schematic
–15
–12
–9
–6
–3
0
3
6
9
12
07037-
044
FREQUENCY (Hz)
C
LOS
E
D
-LOOP
GA
IN
(
dB
)
100k
10M
1M
100M
RF = 1k, CF = 2.7pF
RF = 1k
RF = 100
G = +2
RL = 1k
VS = ±15V
Figure 48. Small Signal Frequency Response for
Various Feedback Impedances
RECOMMENDED VALUES FOR VARIOUS GAINS
Table 8 provides a useful reference for determining various gains
and associated performance. RF is set to 100 for gains greater
than 1. A low feedback RF resistor value reduces peaking and
minimizes the contribution to the overall noise performance
of the amplifier.
Table 8. Gains and Recommended Resistor Values Associated with Them (Conditions: VS = ±5 V, TA = 25°C, RL = 1 k, RT = 49.9 )
Gain
RF ()
RG ()
3 dB SS BW (MHz),
VOUT = 100 mV p-p
Slew Rate (V/s),
VOUT = 2 V Step
ADA4898 Voltage
Noise (nV/√Hz), RTO
Total System Noise
(nV/√Hz), RTO
+1
0
N/A
65
55
0.9
1.29
+2
100
30
50
1.8
3.16
+5
100
24.9
9
45
4.5
7.07
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