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| 型号： | ADA4856-3YCP-EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADA4856-3YCP |
| 标准包装： | 1 |
| 系列： | * |
Data Sheet
ADA4856-3
Rev. B | Page 13 of 20
APPLICATIONS INFORMATION
USING THE ADA4856-3 IN GAINS EQUAL TO +1, 1
The ADA4856-3 was designed to offer outstanding video
performance, simplify applications, and minimize board area.
The ADA4856-3 is a triple amplifier with on-chip feedback
and gain set resistors. The gain is fixed internally at G = +2. The
inclusion of the on-chip resistors not only simplifies the design of
the application but also eliminates six surface-mount resistors,
saving valuable board space and lowering assembly costs.
Whereas the ADA4856-3 has a fixed gain of G = +2, it can be
used in other gain configurations, such as G = 1 and G = +1.
Unity-Gain Operation
Option 1
There are two options for obtaining unity gain (G = +1). The
first is shown in Figure 34. In this configuration, the –IN input
pin is tied to the output (feedback is now provided with the two
internal 402 Ω resistors in parallel), and the input is applied to
the noninverting input. The noise gain for this configuration is 1.
07
68
6-
0
32
0.1F
VIN
RT
VOUT
+VS
–VS
GAIN OF +1
10F
Figure 34. Unity Gain of Option 1
Option 2
Another option exists for running the ADA4856-3 as a unity-
gain amplifier. In this configuration, the noise gain is +2, see
Figure 35. The frequency response and transient response for
this configuration closely match the gain of +2 plots because the
noise gains are equal. This method does have twice the noise gain
of Option 1; however, in applications that do not require low noise,
Option 2 offers less peaking and ringing. By tying the inputs
together, the net gain of the amplifier becomes 1. Equation 1 shows
the transfer characteristic for the schematic shown in Figure 35.
G
F
IN
G
F
IN
OUT
R
V
R
V
(1)
which simplifies to VOUT = VIN.
0.1F
VIN
RT
RG
RF
VOUT
+VS
–VS
GAIN OF +1
0
768
6-
0
30
10F
Figure 35. Unity Gain of Option 2
Inverting Unity-Gain Operation
In this configuration, the noninverting input is tied to ground
and the input signal is applied to the inverting input. The noise
gain for this configuration is +2, see Figure 36.
0.1F
VIN
RT
VOUT
+VS
–VS
GAIN OF –1
07
68
6-
03
1
10F
Figure 36. Inverting Configuration (G = 1)
Figure 37 shows the small signal frequency response for both
gain of +1 (Option 1 and Option 2) and gain of 1 configurations.
It is clear that G = +1, Option 2 has better flatness and no peaking
compared to Option 1.
6
3
0
–3
–6
–9
–12
1
10
100
1000
M
A
GN
ITU
D
E
(
d
B
)
FREQUENCY (MHz)
07
68
6-
0
44
VS = 5V
RL = 100
VOUT = 100mV p-p
OPTION 1
G = +1
OPTION 2
G = +1
G = –1
Figure 37. G = +1 and G = 1
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相关代理商/技术参数 |
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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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