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參數資料
| 型號： | AD8475BRMZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 9/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC FUNNEL AMP DIFF PREC 10MSOP |
| 標準包裝： | 1,000 |
| 放大器類型： | 差分 |
| 電路數： | 1 |
| 輸出類型： | 差分，滿擺幅 |
| 轉換速率： | 50 V/µs |
| -3db帶寬： | 150MHz |
| 電流 - 電源： | 3mA |
| 電流 - 輸出 / 通道： | 110mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 10 V，±1.5 V ~ 5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 10-MSOP |
| 包裝： | 帶卷 (TR) |
Data Sheet
AD8475
Rev. C | Page 17 of 24
THEORY OF OPERATION
OVERVIEW
The AD8475 is a fully differential amplifier, with integrated laser-
trimmed resistors, that provides precision attenuating gains of
0.4 and 0.8. The internal differential amplifier of the AD8475
differs from conventional operational amplifiers in that it has
two outputs whose voltages are equal in magnitude, but move in
opposite directions (180° out of phase). An additional input,
VOCM, sets the output common-mode voltage. Like an opera-
tional amplifier, it relies on high open-loop gain and negative
feedback to force the output nodes to the desired voltages. The
AD8475 is designed to greatly simplify single-ended-to-
differential conversion, common-mode level shifting and
precision attenuation of large signals so that they are compatible
with low voltage, differential input ADCs.
09432-
062
1k
1.25k
AD8475
–IN 0.8x –IN 0.4x
+VS
VOCM
+OUT
+IN 0.8x +IN 0.4x
–VS
NC
–OUT
1.25k
Figure 49. Block Diagram
CIRCUIT INFORMATION
The AD8475 amplifier uses a voltage feedback topology;
therefore, the amplifier exhibits a nominally constant gain
bandwidth product. Like a voltage feedback operational
amplifier, the AD8475 also has high input impedance at its
internal input terminals (the summing nodes of the internal
amplifier) and low output impedance.
The AD8475 employs two feedback loops, one each to control
the differential and common-mode output voltages. The differen-
tial feedback loop, which is fixed with precision laser trimmed
on-chip resistors, controls the differential output voltage.
Output Common-Mode Voltage (VOCM)
The internal common-mode feedback controls the common-
mode output voltage. This architecture makes it easy to set the
output common-mode level to any arbitrary value independent
of the input voltage. The output common-mode voltage is
forced by the internal common-mode feedback loop to be equal
to the voltage applied to the VOCM input. The VOCM pin can
be left unconnected, and the output common-mode voltage
self-biases to midsupply by the internal feedback control.
Due to the internal common-mode feedback loop and the fully
differential topology of the amplifier, the AD8475 outputs are
precisely balanced over a wide frequency range. This means that
the amplifier’s differential outputs are very close to the ideal of
being identical in amplitude and exactly 180° out of phase.
DC PRECISION
The dc precision of the AD8475 is highly dependent on the
accuracy of its internal resistors. Using superposition to analyze
the circuit shown in Figure 50, the following equation shows the
relationship between the input and output voltages of the
amplifier:
(
)
(
)
(
)
(
)
N
P
dm
OUT
N
P
cm
OUT
N
P
N
P
dm
IN
N
P
cm
IN
R
V
R
V
R
V
R
V
+
=
+
2
1
2
1
,
where,
RGP
RFP
RP =
,
RGN
RFN
RN =
N
P
dm
IN
V
=
,
)
(
2
1
,
N
P
cm
IN
V
+
=
The differential closed loop gain of the amplifier is
N
P
N
P
N
P
dm
IN
dm
OUT
R
V
+
=
2
,
and the common rejection of the amplifier is
(
)
N
P
N
P
cm
IN
dm
OUT
R
V
+
=
2
,
09432-
163
RFP
RFN
RGP
RGN
VON
VOP
VOCM
VP
VN
Figure 50. Functional Circuit Diagram of the AD8475 at a Given Gain
The preceding equations show that the gain accuracy and the
common-mode rejection (CMRR) of the AD8475 are deter-
mined primarily by the matching of the feedback networks
(resistor ratios). If the two networks are perfectly matched, that
is, if RP and RN equal RF/RG, then the resistor network does not
generate any CMRR errors and the differential closed loop gain
of the amplifier reduces to
RG
RF
v
dm
IN
dm
OUT
=
,
The AD8475’s integrated resistors are precision wafer-laser-
trimmed to guarantee a minimum CMRR of 86dB (50μV/V),
and gain error of less that 0.05%. To achieve equivalent precision
and performance using a discrete solution, resistors must be
matched to 0.01% or better.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8475BRMZ-RL | 功能描述:IC FUNNEL AMP DIFF PREC 10MSOP 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:1 輸出類型:- 轉換速率: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） 供應商設備封裝:8-SO 包裝:管件 |
| AD8475-EVALZ | 功能描述:BOARD EVAL FOR AD8475 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 運算放大器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- |
| AD8476 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Power, Unity Gain, Fully |
| AD8476ACPZ-R7 | 功能描述:IC AMP DIFF ADC DVR 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1 系列:- 放大器類型:通用 電路數:4 輸出類型:滿擺幅 轉換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:2pA 電壓 - 輸入偏移:1000µV 電流 - 電源:85µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 6 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOICN 包裝:剪切帶 (CT) 產品目錄頁面:680 (CN2011-ZH PDF) 其它名稱:MCP6L04T-E/SLCT |
| AD8476ACPZ-R7_PROMO | 制造商:Analog Devices 功能描述:IC OP-AMP DIFF 6MHZ 10V/US |
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