参数资料
| 型号： | AD8655ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP R-R CMOS 28MHZ 8SOIC |
| 设计资源： | Single Supply Low Noise LED Current Source Driver Using a Current Output DAC in the Reverse Mode (CN0139) |
| 标准包装： | 98 |
| 系列： | DigiTrim® |
| 放大器类型： | 通用 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 11 V/µs |
| 增益带宽积： | 28MHz |
| 电流 - 输入偏压： | 1pA |
| 电压 - 输入偏移： | 50µV |
| 电流 - 电源： | 3.7mA |
| 电流 - 输出 / 通道： | 220mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 管件 |
| 产品目录页面： | 772 (CN2011-ZH PDF) |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8655ARZ | 制造商:Analog Devices 功能描述:IC OP-AMP 28MHZ 11V/ us SOIC-8 |
| AD8655ARZ-REEL | 功能描述:IC OPAMP GP R-R CMOS 28MHZ 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:DigiTrim® 标准包装:160 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:10 V/µs 增益带宽积:9MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:250µV 电流 - 电源:730µA 电流 - 输出 / 通道:28mA 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:管件 |
| AD8655ARZ-REEL7 | 功能描述:IC OPAMP GP R-R CMOS 28MHZ 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:DigiTrim® 标准包装:160 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:10 V/µs 增益带宽积:9MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:250µV 电流 - 电源:730µA 电流 - 输出 / 通道:28mA 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装: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? 包装:带卷（TR） 零件状态:有效 放大器类型:通用 电路数:1 输出类型:满摆幅 压摆率:11 V/μs 增益带宽积:28MHz -3db 带宽:- 电流 - 输入偏置:1pA 电压 - 输入失调:50μV 电流 - 电源:3.7mA 电流 - 输出/通道:220mA 电压 - 电源，单/双（±）:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商器件封装:8-MSOP 标准包装:3,000 |
| AD8656 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Noise, Precision CMOS Amplifier |
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