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參數(shù)資料
| 型號： | ADA4851-2 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Cost, High Speed, Rail-to-Rail, Output Op Amps |
| 中文描述： | 低成本，高速，軌到軌輸出運算放大器 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 325K |
| 代理商： | ADA4851-2 |
ADA4851-1/ADA4851-2/ADA4851-4
CIRCUIT DESCRIPTION
The ADA4851-1, ADA4851-2, and ADA4851-4 feature a high
slew rate input stage that is a true single-supply topology,
capable of sensing signals at or below the minus supply rail. The
rail-to-rail output stage can pull within 60 mV of either supply
rail when driving light loads and within 0.17 V when driving
150 Ω. High speed performance is maintained at supply
voltages as low as 2.7 V.
Rev. D | Page 13 of 20
HEADROOM CONSIDERATIONS
These amplifiers are designed for use in low voltage systems.
To obtain optimum performance, it is useful to understand the
behavior of the amplifiers as input and output signals approach
the amplifiers’ headroom limits. The amplifiers’ input common-
mode voltage range extends from the negative supply voltage
(actually 200 mV below this), or from ground for single-supply
operation, to within 2.2 V of the positive supply voltage. Therefore,
at a gain of 3, the amplifiers can provide full rail-to-rail output
swing for supply voltages as low as 3.3 V and down to 3 V for a
gain of 4.
Exceeding the headroom limit is not a concern for any inverting
gain on any supply voltage, as long as the reference voltage at
the amplifier’s positive input lies within the amplifier’s input
common-mode range.
The input stage is the headroom limit for signals approaching
the positive rail. Figure 40 shows a typical offset voltage vs. the
input common-mode voltage for the ADA4851-1/ADA4851-2/
ADA4851-4 amplifiers on a
±
5 V supply. Accurate dc performance
is maintained from approximately 200 mV below the minus
supply to within 2.2 V of the positive supply. For high speed
signals, however, there are other considerations. Figure 41
shows 3 dB bandwidth vs. dc input voltage for a unity-gain
follower. As the common-mode voltage gets within 2 V of
positive supply, the amplifier responds well but the bandwidth
begins to drop as the common-mode voltage approaches the
positive supply. This can manifest itself in increased distortion
or settling time. Higher frequency signals require more
headroom than the lower frequencies to maintain distortion
performance.
600
580
560
540
520
500
480
460
440
–6
–5
–4
–3
–2
–1
0
1
2
3
4
V
O
μ
V
V
CM
(V)
0
Figure 40. V
OS
vs. Common-Mode Voltage, V
S
= ±5 V
–6
–5
–4
–3
–2
–1
0
1
G
0.1
10
1
100
FREQUENCY (MHz)
2
1000
G = +1
R
L
= 1k
Ω
V
S
= 5V
V
CM
= 3.0V
V
CM
= 3.1V
V
CM
= 3.2V
V
CM
= 3.3V
Figure 41. Unity-Gain Follower Bandwidth vs. Input Common-Mode
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADA4899-1 | Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp |
| ADA4899-1YCPZ-R2 | Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp |
| ADA4899-1YCPZ-R7 | Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp |
| ADA4899-1YCPZ-RL | Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp |
| ADA4899-1YRDZ | Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADA4851-2WYRMZ-R7 | 功能描述:IC OPAMP DUAL R-R HS 8-MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:160 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:10 V/µs 增益帶寬積:9MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:250µV 電流 - 電源:730µA 電流 - 輸出 / 通道:28mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC N 包裝:管件 |
| ADA4851-2YRM-EBZ | 功能描述:BOARD EVAL FOR ADA4851-2YRM RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 運算放大器 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:- |
| ADA4851-2YRMZ | 功能描述:IC OPAMP VF R-R DUAL LP 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 產(chǎn)品培訓(xùn)模塊:Differential Circuit Design Techniques for Communication Applications 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:RF/IF 差分 電路數(shù):1 輸出類型:差分 轉(zhuǎn)換速率:9800 V/µs 增益帶寬積:- -3db帶寬:2.9GHz 電流 - 輸入偏壓:3µA 電壓 - 輸入偏移:- 電流 - 電源:40mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):3 V ~ 3.6 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:剪切帶 (CT) 產(chǎn)品目錄頁面:551 (CN2011-ZH PDF) 其它名稱:ADL5561ACPZ-R7CT |
| ADA4851-2YRMZ-RL | 功能描述:IC OPAMP VF R-R DUAL LP 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:160 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:10 V/µs 增益帶寬積:9MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:250µV 電流 - 電源:730µA 電流 - 輸出 / 通道:28mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC N 包裝:管件 |
| ADA4851-2YRMZ-RL7 | 功能描述:IC OPAMP VF R-R DUAL LP 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:160 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:10 V/µs 增益帶寬積:9MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:250µV 電流 - 電源:730µA 電流 - 輸出 / 通道:28mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC N 包裝:管件 |
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