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參數(shù)資料
| 型號： | AD8390ACP-R2 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP DIFF LP LDIST 16LFCSP |
| 標準包裝： | 1 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 1 |
| 輸出類型： | 差分 |
| 轉(zhuǎn)換速率： | 300 V/µs |
| -3db帶寬： | 60MHz |
| 電流 - 輸入偏壓： | 4µA |
| 電壓 - 輸入偏移： | 1000µV |
| 電流 - 電源： | 10mA |
| 電流 - 輸出 / 通道： | 400mA |
| 電壓 - 電源，單路/雙路(±)： | 10 V ~ 24 V，±5 V ~ 12 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-VQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 16-LFCSP-VQ |
| 包裝： | 標準包裝 |
| 其它名稱： | AD8390ACP-R2DKR |
AD8390
Rev. C | Page 9 of 16
THEORY OF OPERATION
03600-0-035
A
C
B
50k
RG
50k
56k
VCC
56k
VOCM
BYP
+OUT
AD8390
–OUT
+IN
IADJ
PWDN0
RADJ
PWDN1
DGND
–IN
VEE
RF
Figure 22. Functional Block Diagram
The AD8390 is a true differential operational amplifier with
common-mode feedback. The AD8390 is functionally equivalent
to three op amps, as shown in Figure 22. Amplifiers A and B act
like a standard dual op amp in an inverting configuration that
requires four resistors to set the desired gain.
The third amplifier (C) maintains the common-mode voltage
(VOCM) at the output of the AD8390. VOCM is internally
generated, as shown in Figure 22. The common-mode feedback
amplifier (C) drives the noninverting terminals of A and B such
that the difference between the output common-mode voltage
and VOCM is always zero. This functionality forces the outputs to
sit at midsupply, which results in differential outputs of identical
amplitude and 180 degrees out of phase. The user also has the
option to externally drive the VOCM pin as an input to set the dc
output common-mode voltage. For details, see the Setting the
Output Common-Mode Voltage section.
APPLICATIONS
CIRCUIT DEFINITIONS
Differential voltage refers to the difference between two node
voltages. For example, the output differential voltage (or output
differential-mode voltage) is defined as
(
)
OUT
DM
OUT
V
+
=
,
(1)
V+OUT and V–OUT refer to the voltages at the +OUT and –OUT
terminals with respect to a common reference.
Common-mode voltage refers to the average of the two node
voltages. The output common-mode voltage is defined as
(
)
2
,
OUT
CM
OUT
V
+
=
(2)
ANALYZING A BASIC APPLICATION CIRCUIT
The AD8390 uses high open-loop gain and negative feedback to
force its differential and common-mode output voltages in such
a way as to minimize the differential and common-mode error
voltages. The differential error voltage is defined as the voltage
between the differential inputs +IN and –IN, as shown in
Figure 23. For most purposes, this voltage can be assumed to be
zero. Similarly, the difference between the actual output
common-mode voltage and the voltage applied to VOCM can also
be assumed to be zero. Starting from these two assumptions, any
application circuit can be analyzed.
03600-0-022
RF
–OUT
+OUT
+IN
–IN
RG
VOCM
RG
RL,DM VOUT,DM
+
–
VIN,DM
–
+
RF
Figure 23. Basic Applications Circuit
(IADJ Pin Not Connected, and PWDN0 and PWDN1 Held High)
SETTING THE CLOSED-LOOP GAIN
The differential-mode gain of the circuit in Figure 23 can be
described by
G
F
DM
IN
DM
OUT
R
V
=
,
(3)
CALCULATING INPUT IMPEDANCE
The input impedance of the circuit in Figure 23 between the
inputs (V+IN and VIN) is simply
G
DM
IN
R
×
= 2
,
(4)
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| AD8390ACPZ-REEL7 | 功能描述:IC AMP DIFF LP LDIST 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:100 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:0.2 V/µs 增益帶寬積:- -3db帶寬:- 電流 - 輸入偏壓:100pA 電壓 - 輸入偏移:30µV 電流 - 電源:380µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):±2 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:管件 |
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