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| 型号： | ADA4856-3YCPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC AMP 3CH RRO VFB G=+2 16LFCSP |
| 标准包装： | 5,000 |
| 应用： | 电压反馈 |
| 输出类型： | 满摆幅 |
| 电路数： | 3 |
| -3db带宽： | 370MHz |
| 转换速率： | 800 V/µs |
| 电流 - 电源： | 7.8mA |
| 电流 - 输出 / 通道： | 52mA |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 5.5 V，±1.5 V ~ 2.75 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VQFN 裸露焊盘，CSP |
| 供应商设备封装： | 16-LFCSP-VQ EP（4x4） |
| 包装： | 带卷 (TR) |
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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