參數(shù)資料
型號(hào): AD8544WARZ-RL
廠商: Analog Devices Inc
文件頁(yè)數(shù): 7/20頁(yè)
文件大?。?/td> 0K
描述: IC OPAMP GP R-R CMOS 1MHZ 14SOIC
標(biāo)準(zhǔn)包裝: 2,500
放大器類型: 通用
電路數(shù): 4
輸出類型: 滿擺幅
轉(zhuǎn)換速率: 0.92 V/µs
增益帶寬積: 1MHz
電流 - 輸入偏壓: 4pA
電壓 - 輸入偏移: 1000µV
電流 - 電源: 45µA
電流 - 輸出 / 通道: 30mA
電壓 - 電源,單路/雙路(±): 2.7 V ~ 5.5 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(yīng)商設(shè)備封裝: 14-SOICN
包裝: 帶卷 (TR)
AD8541/AD8542/AD8544
Rev. G | Page 15 of 20
PHOTODIODE APPLICATION
The AD854x family has very high impedance with an input bias
current typically around 4 pA. This characteristic allows the
AD854x op amps to be used in photodiode applications and
other applications that require high input impedance. Note that
the AD854x has significant voltage offset that can be removed
by capacitive coupling or software calibration.
Figure 40 illustrates a photodiode or current measurement
application. The feedback resistor is limited to 10 MΩ to avoid
excessive output offset. In addition, a resistor is not needed on
the noninverting input to cancel bias current offset because the
bias current-related output offset is not significant when compared
to the voltage offset contribution. For best performance, follow the
standard high impedance layout techniques, which include the
following:
Shielding the circuit.
Cleaning the circuit board.
Putting a trace connected to the noninverting input around
the inverting input.
Using separate analog and digital power supplies.
AD8541
4
6
7
3
2
D
OR
V+
2.5VREF
C
100pF
R
10M
2.5VREF
VOUT
00
93
5-
0
39
Figure 40. High Input Impedance Application—Photodiode Amplifier
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