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參數(shù)資料
| 型號(hào)： | AD8057 |
| 廠(chǎng)商： | Analog Devices, Inc. |
| 英文描述： | Voltage Feedback, 325 MHz Amplifiers(低成本,高性能,電壓反饋放大器) |
| 中文描述： | 電壓反饋，325兆赫放大器（低成本，高性能，電壓反饋放大器） |
| 文件頁(yè)數(shù)： | 13/14頁(yè) |
| 文件大小： | 198K |
| 代理商： | AD8057 |
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AD8057/AD8058
–13–
REV. 0
For zero volts input, the outputs of the op amps want to be at
2.5 V, which is the midsupply level of the A-to-D. This is ac-
complished by first taking the 2.5 V reference output of the
A-to-D and dividing it by two by a pair of 1 k
resistors. The
resulting 1.25 V is applied to each op amp’s positive input. This
voltage is then multiplied by the gain of 2 of the op amps to
provide a 2.5 V level at each output.
The assumption for this circuit is that the input signal is bipolar
with respect to round and the circuit must be dc coupled. This
implies the existence of a negative supply elsewhere in the system.
This circuit uses –5 V as the negative supply for the AD8058.
If the AD8058 negative supply were tied to ground, there would
be a problem at the input of the noninverting op amp. The
input common-mode voltage can only go to within 1 V of the
negative rail. Since this circuit requires that the positive inputs
operate with a 1.25 V bias, there is not enough room to swing
this voltage in the negative direction. The inverting stage does
not have this problem, because its common-mode input voltage
remains fixed at 1.25 V. If dc-coupling is not required, various
ac-coupling techniques can be used to eliminate this problem.
Layout
The AD8057 and AD8058 are high speed op amps and should
be used in a board layout that follows standard high speed de-
sign rules. All the signal traces should be as short and direct as
possible. In particular, the parasitic capacitance on the inverting
input of each device should be kept to a minimum to avoid
excessive peaking and other undesirable performance.
The power supplies should be bypassed very close to the power
pins of the package with 0.1
μ
F in parallel with a larger, approxi-
mately 10
μ
F tantalum capacitor. These capacitors should be
connected to a ground plane that is either on an inner layer, or
fills the area of the board that is not used for other signals.
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| AD8057_03 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Low Cost, High Performance Voltage Feedback, 325 MHz Amplifiers |
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| AD8057AR | 功能描述:IC OPAMP VF LN LP LDIST 8SOIC RoHS:否 類(lèi)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(lèi)型:電壓反饋 電路數(shù):4 輸出類(lèi)型:滿(mǎn)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(lèi)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) |
| AD8057AR-EBZ | 功能描述:BOARD EVAL FOR AD8057AR RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 運(yùn)算放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- |
| AD8057AR-REEL | 功能描述:IC OPAMP VF LN LP LDIST 8SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類(lèi)型:通用 電路數(shù):1 輸出類(lèi)型:滿(mǎn)擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)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:帶卷 (TR) |
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