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| 型号： | ADA4856-3YCP-EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADA4856-3YCP |
| 标准包装： | 1 |
| 系列： | * |
ADA4856-3
Data Sheet
Rev. B | Page 14 of 20
USING THE ADA4856-3 IN GAINS EQUAL TO +3,
+4, AND +5
Depending on certain applications, it might be useful to have a
fixed gain amplifier that can provide various gains. The advantage
of having a fixed gain amplifier is the ease of layout, the reduced
number of components needed, and the matching of the gain
and feedback resistors.
Gain of +3 Configuration
Figure 38 shows the ADA4856-3 used as an amplifier with a
fixed gain of +3. No external resistors are required, just a simple
trace connecting certain inputs and outputs. Connect VIN to U1,
which is set to a gain of +2, and U2, which is set to unity. U3 then
takes the output of U1 and gains it up by +2 and subtracts the
signal frequency response for G = +3 is flat out to 65 MHz, with a
bandwidth of 165 MHz, a 2 V p-p output voltage, and a 100 load.
ADA4856-3
07686-
045
PD
16
15
14
13
5
6
7
12
11
10
9
1
2
3
4
0.1F
10F
0.1F
+
10F
+
–VS
+VS
VOUT
VIN
8
Figure 38. Gain of +3
Gain of +4 Configuration
To get a gain of +4, set one amplifier to a gain of +1 and set the
U2 at unity, then U1 takes the output of U2 and gains it by +2, and
then feeds it to U3, which also gains it by +2 to produce VOUT.
ADA4856-3
07686-
046
PD
16
15
14
13
5
6
7
12
11
10
9
1
2
3
4
0.1F
10F
0.1F
+
10F
+
–VS
+VS
VOUT
VIN
8
Figure 39. Gain of +4
As shown in Figure 41, the large signal frequency response
for G = +4 is also flat out to 65 MHz, and it has a bandwidth
of 180 MHz.
Gain of +5 Configuration
The gain of +5 is very similar to the G = +3 configuration but with
U2 set to a gain of 1, which ends up being added to twice the
output of U1 to generate VOUT with G = +5.
ADA4856-3
07686-
047
PD
16
15
14
13
5
6
7
12
11
10
9
1
2
3
4
0.1F
10F
0.1F
+
10F
+
–VS
+VS
VOUT
VIN
8
Figure 40. Gain of +5
Figure 41 shows the large signal frequency response of the three
closed-loop gain sets (+3, +4, and +5) with flatness that extends
to 65 MHz and a 3 dB bandwidth of 190 MHz.
–18
–15
–12
–9
–6
–3
0
3
6
9
12
15
1
10
100
1000
C
LOS
E
D
-LOOP
GA
IN
(
dB
)
FREQUENCY (MHz)
G = +5
G = +4
G = +3
07686-
048
RL = 100
VS = 5V
VOUT = 2V p-p
Figure 41. Large Signal Frequency Response for All Three Gains
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| ADA4856-3YCPZ-R2 | 功能描述:IC AMP 3CH RRO VFB G=+2 16LFCSP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| ADA4856-3YCPZ-R7 | 功能描述:IC AMP 3CH RRO VFB G=2 16LFCSP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 应用:TFT-LCD 面板：VCOM 驱动器 输出类型:满摆幅 电路数:1 -3db带宽:35MHz 转换速率:40 V/µs 电流 - 电源:3.7mA 电流 - 输出 / 通道:1.3A 电压 - 电源，单路/双路(±):9 V ~ 20 V，±4.5 V ~ 10 V 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 供应商设备封装:8-uMax-EP 包装:管件 |
| ADA4856-3YCPZ-RL | 功能描述:IC AMP 3CH RRO VFB G=+2 16LFCSP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| ADA4857-1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Ultralow Distortion, Low Power, Low Noise, High Speed Op Amp |
| ADA4857-1ACP-EBZ | 功能描述:BOARD EVAL FOR ADA4857-1ACP RoHS:是 类别:编程器，开发系统 >> 评估板 - 运算放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
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