- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄3528 > AD8277BRZ-RL (Analog Devices Inc)IC AMP GP UNITY GAIN DIFF 14SOIC PDF資料下載
參數(shù)資料
| 型號： | AD8277BRZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/20頁 |
| 文件大小： | 0K |
| 描述： | IC AMP GP UNITY GAIN DIFF 14SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 1.1 V/µs |
| 增益帶寬積： | 550kHz |
| 電壓 - 輸入偏移： | 100µV |
| 電流 - 電源： | 200µA |
| 電流 - 輸出 / 通道： | 15mA |
| 電壓 - 電源，單路/雙路(±)： | 2 V ~ 36 V，±2 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-SOIC |
| 包裝： | 帶卷 (TR) |
AD8276/AD8277
Data Sheet
Rev. C | Page 14 of 20
THEORY OF OPERATION
CIRCUIT INFORMATION
Each channel of the AD8276/AD8277 consists of a low power, low
noise op amp and four laser-trimmed on-chip resistors. These
resistors can be externally connected to make a variety of amplifier
configurations, including difference, noninverting, and inverting
configurations. Taking advantage of the integrated resistors of
the AD8276/AD8277 provides the designer with several benefits
over a discrete design, including smaller size, lower cost, and
better ac and dc performance.
2
5
3
1
6
7
4
40k
–VS
+VS
IN–
IN+
SENSE
OUT
REF
AD8276
40k
07692-
031
Figure 38. Functional Block Diagram
DC Performance
Much of the dc performance of op amp circuits depends on the
accuracy of the surrounding resistors. Using superposition to
analyze a typical difference amplifier circuit, as is shown in
Figure 39, the output voltage is found to be
+
+
=
+
R3
R4
V
R3
R4
R2
R1
R2
V
IN
OUT
1
This equation demonstrates that the gain accuracy and common-
mode rejection ratio of the AD8276/AD8277 is determined
primarily by the matching of resistor ratios. Even a 0.1% mismatch
in one resistor degrades the CMRR to 66 dB for a G = 1 difference
amplifier.
The difference amplifier output voltage equation can be reduced to
(
)
+
=
N
I
IN
OUT
V
R3
R4
V
as long as the following ratio of the resistors is tightly matched:
R3
R4
R1
R2 =
The resistors on the AD8276/AD8277 are laser trimmed to match
accurately. As a result, the AD8276/AD8277 provide superior
performance over a discrete solution, enabling better CMRR,
gain accuracy, and gain drift, even over a wide temperature range.
AC Performance
Component sizes and trace lengths are much smaller in an IC
than on a PCB, so the corresponding parasitic elements are also
smaller. This results in better ac performance of the AD8276/
AD8277. For example, the positive and negative input terminals
of the AD8276/AD8277 op amps are intentionally not pinned
out. By not connecting these nodes to the traces on the PCB, the
capacitance remains low, resulting in improved loop stability
and excellent common-mode rejection over frequency.
DRIVING THE AD8276/AD8277
Care should be taken to drive the AD8276/AD8277 with a low
impedance source: for example, another amplifier. Source
resistance of even a few kilohms (k) can unbalance the resistor
ratios and, therefore, significantly degrade the gain accuracy and
common-mode rejection of the AD8276/AD8277. Because all
configurations present several kilohms of input resistance, the
AD8276/AD8277 do not require a high current drive from the
source and so are easy to drive.
INPUT VOLTAGE RANGE
The AD8276/AD8277 are able to measure input voltages beyond
the supply rails. The internal resistors divide down the voltage
before it reaches the internal op amp and provide protection to
the op amp inputs. Figure 39 shows an example of how the
voltage division works in a difference amplifier configuration.
For the AD8276/AD8277 to measure correctly, the input
voltages at the input nodes of the internal op amp must stay
below 1.5 V of the positive supply rail and can exceed the
negative supply rail by 0.1 V. Refer to the Power Supplies section
for more details.
R4
VIN+
VIN–
R3
R1
R2
R1 + R2
(VIN+)
R2
R1 + R2
(VIN+)
07692-
033
Figure 39. Voltage Division in the Difference Amplifier Configuration
The AD8276/AD8277 have integrated ESD diodes at the inputs
that provide overvoltage protection. This feature simplifies
system design by eliminating the need for additional external
protection circuitry, and enables a more robust system.
The voltages at any of the inputs of the parts can safely range
from +VS 40 V up to VS + 40 V. For example, on ±10 V
supplies, input voltages can go as high as ±30 V. Care should be
taken to not exceed the +VS 40 V to VS + 40 V input limits
to avoid risking damage to the parts.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| P6KE9.1AHE3/54 | TVS 600W 9.1V 5% UNIDIR AXIAL |
| RC0805FR-072K55L | RES 2.55K OHM 1/8W 1% 0805 SMD |
| P6KE91AHE3/54 | TVS 600W 91V 5% UNIDIR AXIAL |
| RW2R0DAR050JET | RES POWER .050 OHM 2W 5% SMT |
| P6KE8.2AHE3/54 | TVS 600W 8.2V 5% UNIDIR AXIAL |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8277-EVALZ | 功能描述:AD8277 2 - Dual Channels per IC Difference Amplifier Evaluation Board 制造商:analog devices inc. 系列:- 零件狀態(tài):有效 每 IC 通道數(shù):2 - 雙 放大器類型:差異 輸出類型:單端，滿擺幅 壓擺率:1.1 V/μs -3db 帶寬:550kHz 電流 - 輸出/通道:15mA 工作溫度:-40°C ~ 85°C 電流 - 電源（主 IC）:200μA 電壓 - 電源，單/雙（±）:2 V ~ 36 V，±2 V ~ 18 V 板類型:完全填充 所含物品:板 使用的 IC/零件:AD8277 標(biāo)準(zhǔn)包裝:1 |
| AD8278 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Power, Wide Supply Range, Low Cost Difference Amplifier, G = ?, 2 |
| AD8278ARMZ | 功能描述:IC OPAMP DIFFERENTIAL 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:帶卷 (TR) |
| AD8278ARMZ | 制造商:Analog Devices 功能描述:IC DIFFERENTIAL AMP 1MHZ 1.4V/ MSOP8 制造商:Analog Devices 功能描述:IC, DIFFERENTIAL AMP, 1MHZ 1.4V/ uS MSOP8 |
| AD8278ARMZ-R7 | 功能描述:IC OPAMP DIFFERENTIAL 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。