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| 型号： | ADA4940-2ACPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/33页 |
| 文件大小： | 0K |
| 描述： | IC DIFF ADC DVR 18BIT LN 24LFCSP |
| 标准包装： | 5,000 |
| 放大器类型： | 差分 |
| 电路数： | 2 |
| 输出类型： | 差分 |
| 转换速率： | 95 V/µs |
| -3db带宽： | 260MHz |
| 电流 - 输入偏压： | 1.1µA |
| 电压 - 输入偏移： | 60µV |
| 电流 - 电源： | 1.25mA |
| 电流 - 输出 / 通道： | 46mA |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 7 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 24-LFCSP-VQ（4x4） |
| 包装： | 带卷 (TR) |
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ADA4940-1/ADA4940-2
Data Sheet
Rev. C | Page 22 of 32
THEORY OF OPERATION
The ADA4940-1/ADA4940-2 are high speed, low power
differential amplifiers fabricated on Analog Devices advanced
dielectrically isolated SiGe bipolar process. They provide two
closely balanced differential outputs in response to either
differential or single-ended input signals. An external feedback
network that is similar to a voltage feedback operational
amplifier sets the differential gain. The output common-mode
voltage is independent of the input common-mode voltage and
is set by an external voltage at the VOCM terminal. The PNP
input stage allows input common-mode voltages between the
negative supply and 1.2 V below the positive supply. A rail-to-
rail output stage supplies a wide output voltage range.
The DISABLE pin can be used to reduce the supply current of
the amplifier to 13.5 A.
The differential feedback loop consists of the differential trans-
conductance GDIFF working through the GO output buffers and
the RF/RG feedback networks. The common-mode feedback
loop is set up with a voltage divider across the two differential
outputs to create an output voltage midpoint and a common-
mode transconductance, GCM.
08452-
058
GO
CC
RF
RG
GCM
GDIFF
GO
RG
VREF
–OUT
+OUT
RF
+DIN
–DIN
+IN
–IN
VOCM
Figure 62. ADA4940-1/ADA4940-2 Architectural Block
The differential feedback loop forces the voltages at +IN and IN
to equal each other. This fact sets the following relationships:
F
OUT
G
IN
R
V
R
D
=
+
F
OUT
G
IN
R
V
R
D
+
=
Subtracting the previous equations gives the relationship that
shows RF and RG setting the differential gain.
(V+OUT VOUT) = (+DIN – (DIN)) ×
G
F
R
The common-mode feedback loop drives the output common-
mode voltage that is sampled at the midpoint of the output
voltage divider to equal the voltage at VOCM. This results in the
following relationships:
V+OUT = VOCM +
2
dm
OUT,
V
VOUT = VOCM
2
dm
OUT,
V
Note that the differential amplifier’s summing junction input
voltages, +IN and IN, are set by both the output voltages and
the input voltages.
+
+
=
+
G
F
G
OUT
G
F
IN
R
V
R
D
V
+
+
=
+
G
F
G
OUT
G
F
IN
R
V
R
D
V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADA4941 | 制造商:AD 制造商全称:Analog Devices 功能描述:16-Bit, 100 kSPS PulSAR, Differential ADC in MSOP |
| ADA4941-1 | 制造商:AD 制造商全称:Analog Devices 功能描述:16-Bit Lower Power |
| ADA4941-1YCP-EBZ | 功能描述:BOARD EVAL FOR ADA4941-1YCP 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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| ADA4941-1YCPZ-R7 | 功能描述:IC AMP DIFF ADC DVR 18BIT 8LFCSP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
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