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參數(shù)資料
| 型號(hào)： | ADA4941-1YCP-EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/25頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADA4941-1YCP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 每 IC 通道數(shù)： | 1 - 單 |
| 放大器類型： | 差分 |
| 板類型： | 裸（未填充） |
| 已供物品： | 板 |
| 已用 IC / 零件： | 8-LFCSP 封裝 |
ADA4941-1
Rev. C | Page 19 of 24
FREQUENCY RESPONSE VS. CLOSED-LOOP GAIN
The operational amplifiers used in the ADA4941-1 are voltage
feedback with an open-loop frequency response that can be
approximated with the integrator response, as shown in Figure 53.
100
0
0.001
100
FREQUENCY (MHz)
OP
E
N
-LOOP
GA
IN
(
dB
)
05704-
062
80
60
40
20
0.01
0.1
1
10
fcr = 50MHz
Figure 53. ADA4941-1 Op Amp Open-Loop Gain vs. Frequency
For each amplifier, the frequency response can be approximated
by the following equations:
×
+
×
+
×
=
fcr
f
R
VIN
_A1
V
G
F
G
F
O
1
(15)
(Noninverting Response)
×
+
×
×
=
fcr
f
R
VIN
_A2
V
G
F
G
F
O
1
(16)
(Inverting Response)
fCR is the gain-bandwidth frequency of the amplifier (where the
amplifiers is about 50 MHz.
The inverting amplifier A2 has a fixed feedback network. The
transfer function is approximately
+
×
=
×
+
×
=
MHz
25
1
MHz
50
2
1
2
_
f
VOP
f
VIN
A
VO
(17)
A1’s frequency response depends on the external feedback
network as indicated by Equation 15. The overall differential
output voltage is therefore
VO, dm = VOP VON = VOP + VOP ×
+
MHz
25
1
f
(18)
+
×
×
+
×
+
×
=
MHz
25
1
MHz
50
1
f
R
VIN
, dm
V
G
F
G
F
O
(19)
Multiplying the terms and neglecting negligible terms leads to
the following approximation:
+
×
×
+
×
+
=
MHz
25
1
MHz
50
1
2
1
,
f
R
VIN
dm
V
G
F
G
F
O
(20)
There are two poles in this transfer function, and the lower
frequency pole limits the bandwidth of the differential
amplifier. If VOP is shorted to IN (A1 is a unity gain follower),
the 25 MHz closed-loop bandwidth of the inverting channel
limits the overall bandwidth. When A1 is operating with higher
noise gains, the bandwidth is limited by A1’s closed-loop
bandwidth, which is inversely proportional to the noise gain
(1 + RF/RG). For instance, if the external feedback network
provides a noise gain of 10, the bandwidth drops to 5 MHz.
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| ADA4941-1YRZ | 功能描述:IC DIFF ADC DVR 18BIT 8-SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變增益放大器 應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
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