参数资料
型号: ADA4899-1YCPZ-RL
厂商: Analog Devices Inc
文件页数: 7/21页
文件大小: 0K
描述: IC OPAMP VF ULN ULDIST 8LFCSP
产品培训模块: Practical Guide High Speed PCB Layout
设计资源: High Speed, Precision, Differential AC-Coupled Drive Circuit for AD7625 (CN0080)
标准包装: 5,000
放大器类型: 电压反馈
电路数: 1
转换速率: 310 V/µs
-3db带宽: 600MHz
电流 - 输入偏压: 6µA
电压 - 输入偏移: 35µV
电流 - 电源: 14.7mA
电流 - 输出 / 通道: 200mA
电压 - 电源,单路/双路(±): 4.5 V ~ 12 V,±2.25 V ~ 6 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-VFDFN 裸露焊盘,CSP
供应商设备封装: 8-LFCSP-VD(3x3)
包装: 带卷 (TR)
ADA4899-1
Rev. B | Page 14 of 20
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.
Figure 47 shows the small signal frequency response for the
unity-gain amplifier shown in Figure 46.
05
72
0
-03
7
VOUT
+VS
–VS
0.1F
24.9
VIN
0.1F
Figure 46. Unity-Gain Schematic
05
72
0-
0
63
10000
1100
10
1000
–12
–9
–6
–3
0
3
G = +1
RL = 100
C
L
O
S
E
D
-L
OO
P
GA
IN
(dB
)
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 RS is not required. Resistors RF and RG
are kept low to minimize their contribution to the overall noise
performance of the amplifier.
Table 4. Conditions: VS = ±5 V, TA = 25°C, RL = 1 kΩ
Gain
RF (Ω)
RG (Ω)
RS (Ω)
3 dB SS BW (MHz)
(25 mV p-p)
Slew Rate (V/μs)
(2 V Step)
ADA4899-1 Voltage
Noise (nV/√Hz)
Total Voltage
Noise (nV/√Hz)
+1
0
NA
24.9
605
274
1
1.2
1
100
0
294
265
2
2.7
+2
100
0
277
253
2
2.7
+5
200
49.9
0
77
227
5
6.5
+10
453
49.9
0
37
161
10
13.3
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