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參數(shù)資料
| 型號(hào)： | AD8655ARZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/20頁 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP R-R CMOS 28MHZ 8SOIC |
| 設(shè)計(jì)資源： | Single Supply Low Noise LED Current Source Driver Using a Current Output DAC in the Reverse Mode (CN0139) |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | DigiTrim® |
| 放大器類型： | 通用 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 11 V/µs |
| 增益帶寬積： | 28MHz |
| 電流 - 輸入偏壓： | 1pA |
| 電壓 - 輸入偏移： | 50µV |
| 電流 - 電源： | 3.7mA |
| 電流 - 輸出 / 通道： | 220mA |
| 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： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
AD8655/AD8656
Data Sheet
Rev. E | Page 16 of 20
APPLICATIONS INFORMATION
INPUT OVERVOLTAGE PROTECTION
voltages exceeding the supply to be applied at the input. It is
recommended, however, not to apply voltages that exceed the
supplies by more than 0.3 V at either input of the amplifier. If a
higher input voltage is applied, series resistors should be used to
limit the current flowing into the inputs. The input current
should be limited to less than 5 mA.
The extremely low input bias current allows the use of larger
resistors, which allows the user to apply higher voltages at the
inputs. The use of these resistors adds thermal noise, which
contributes to the overall output voltage noise of the amplifier.
For example, a 10 k resistor has less than 12.6 nV/√Hz of
thermal noise and less than 10 nV of error voltage at room
temperature.
INPUT CAPACITANCE
Along with bypassing and ground, high speed amplifiers can be
sensitive to parasitic capacitance between the inputs and ground.
For circuits with resistive feedback network, the total capacitance,
whether it is the source capacitance, stray capacitance on the
input pin, or the input capacitance of the amplifier, causes a
breakpoint in the noise gain of the circuit. As a result, a
capacitor must be added in parallel with the gain resistor to
obtain stability. The noise gain is a function of frequency and
peaks at the higher frequencies, assuming the feedback capaci-
tor is selected to make the second-order system critically damped.
A few picofarads of capacitance at the input reduce the input
impedance at high frequencies, which increases the amplifier’s
gain, causing peaking in the frequency response or oscillations.
for stability with capacitive loads greater than 200 pF with
direct input to output feedback. See the Driving Capacitive
Loads section.
DRIVING CAPACITIVE LOADS
Although the AD8655/AD8656 can drive capacitive loads up to
500 pF without oscillating, a large amount of ringing is present
when operating the part with input frequencies above 100 kHz.
This is especially true when the amplifiers are configured in
positive unity gain (worst case). When such large capacitive
loads are required, the use of external compensation is highly
recommended. This reduces the overshoot and minimizes
ringing, which, in turn, improves the stability of the AD8655/
AD8656 when driving large capacitive loads.
One simple technique for compensation is a snubber that
consists of a simple RC network. With this circuit in place,
output swing is maintained, and the amplifier is stable at all
gains. Figure 55 shows the implementation of a snubber, which
reduces overshoot by more than 30% and eliminates ringing.
Using a snubber does not recover the loss of bandwidth
incurred from a heavy capacitive load.
Figure 54. Driving Heavy Capacitive Loads Without Compensation
Figure 55. Snubber Network
Figure 56. Driving Heavy Capacitive Loads Using a Snubber Network
TIME (2
s/DIV)
VS = ±2.5V
AV = 1
CL = 500pF
05304-051
VOLTAGE
(100mV/DIV)
+IN
200
500pF
–IN
VCC
VEE
200mV
+
–
05304-
052
+
–
VS = ±2.5V
AV = 1
RS = 200
CS = 500pF
CL = 500pF
TIME (10
s/DIV)
05304-053
VOLTAGE
(100mV/DIV)
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| AD8655ARZ-REEL7 | 功能描述:IC OPAMP GP R-R CMOS 28MHZ 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:DigiTrim® 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 |
| AD8655WARMZ-RL | 功能描述:General Purpose Amplifier 1 Circuit Rail-to-Rail 8-MSOP 制造商:analog devices inc. 系列:DigiTrim? 包裝:帶卷（TR） 零件狀態(tài):有效 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 壓擺率:11 V/μs 增益帶寬積:28MHz -3db 帶寬:- 電流 - 輸入偏置:1pA 電壓 - 輸入失調(diào):50μV 電流 - 電源:3.7mA 電流 - 輸出/通道:220mA 電壓 - 電源，單/雙（±）: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:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商器件封裝:8-MSOP 標(biāo)準(zhǔn)包裝:3,000 |
| AD8656 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Noise, Precision CMOS Amplifier |
| AD8656ARMZ | 功能描述:IC OPAMP GP R-R CMOS 28MHZ 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:DigiTrim® 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| AD8656ARMZ | 制造商:Analog Devices 功能描述:IC OP-AMP 28MHZ 11V/ MSOP-8 |
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