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參數(shù)資料
| 型號： | AD549J |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Ultralow Input Bias Current Operational Amplifier |
| 中文描述： | 超低輸入偏置電流運算放大器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 418K |
| 代理商： | AD549J |
AD549
REV. A
–6–
Figure 18. Unity Gain
Follower
Figure 21. Unity Gain Inverter
Figure 19. Unity Gain Follower
Large Signal Pulse Response
Figure 22. Unity Gain Inverter
Large Signal Pulse Response
Figure 20. Unity Gain Follower
Small Signal Pulse Response
Figure 23. Unity Gain Inverter
Small Signal Pulse Response
MINIMIZING INPUT CURRENT
The AD549 has been optimized for low input current and offset
voltage. Careful attention to how the amplifier is used will reduce
input currents in actual applications.
The amplifier operating temperature should be kept as low as pos-
sible to minimize input current. Like other JFET input amplifiers,
the AD549’s input current is sensitive to chip temperature, rising
by a factor of 2.3 for every 10
°
C rise. This is illustrated in Figure
24, a plot of AD549 input current versus ambient temperature.
TEMPERATURE –
°
C
1nA
100pA
10pA
1fA
–55 –25 5 35 65 95 125
1pA
100fA
10fA
Figure 24. AD549 Input Bias Current vs.
Ambient Temperature
On-chip power dissipation will raise chip operating temperature
causing an increase in input bias current. Due to the AD549’s
low quiescent supply current, chip temperature when the (un-
loaded) amplifier is operated with 15 V supplies, is less than 3
°
C
higher than ambient. The difference in input current is negligible.
However, heavy output loads can cause a significant increase
in chip temperature and a corresponding increase in input
current. Maintaining a minimum load resistance of 10
is rec-
ommended. Input current versus additional power dissipation
due to output drive current is plotted in Figure 25.
ADDITIONAL INTERNAL POWER DISSIPATION – mW
6.0
5.0
4.0
1.0
0 25 50 75 100 125 150 175 200
3.0
2.0
N
BASED ON
TYPICAL I
B
= 40fA
Figure 25. AD549 Input Bias Current vs.
Additional Power Dissipation
CIRCUIT BOARD NOTES
There are a number of physical phenomena that generate
spurious currents that degrade the accuracy of low current
measurements. Figure 26 is a schematic of an I-to-V converter
with these parasitic currents modeled.
Finite resistance from input lines to voltages on the board,
modeled by resistor R
P
, results in parasitic leakage. Insulation
resistance of over 10
15
must be maintained between the
amplifier’s signal and supply lines in order to capitalize on the
AD549’s low input currents. Standard PC board material
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD549JCHIPS | 制造商:Analog Devices 功能描述: |
| AD549JH | 功能描述:IC OPAMP GP 1MHZ LP 20MA TO99-8 RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:Topgate™ 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作溫度:-40°C ~ 85°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-SOIC 包裝:帶卷 (TR) |
| AD549JH | 制造商:Analog Devices 功能描述:SEMICONDUCTORS LINEAR |
| AD549JH/+ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD549JHZ | 功能描述:IC OPAMP GP 1MHZ LP 20MA TO99-8 RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:Topgate™ 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
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