參數(shù)資料
型號(hào)： ADA4940-2ACPZ-RL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 16/33頁(yè)
文件大?。?/td> 0K
描述： IC DIFF ADC DVR 18BIT LN 24LFCSP
標(biāo)準(zhǔn)包裝： 5,000
放大器類型： 差分
電路數(shù)： 2
輸出類型： 差分
轉(zhuǎn)換速率： 95 V/µs
-3db帶寬： 260MHz
電流 - 輸入偏壓： 1.1µA
電壓 - 輸入偏移： 60µV
電流 - 電源： 1.25mA
電流 - 輸出 / 通道： 46mA
電壓 - 電源，單路/雙路(±)： 3 V ~ 7 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 24-VFQFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 24-LFCSP-VQ（4x4）
包裝： 帶卷 (TR)
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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