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| 型号： | AD823AARMZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP JFET RR 17MHZ DL 8MSOP |
| 标准包装： | 1,000 |
| 放大器类型： | J-FET |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 35 V/µs |
| -3db带宽： | 19MHz |
| 电流 - 输入偏压： | 1.3pA |
| 电压 - 输入偏移： | 700µV |
| 电流 - 电源： | 6.3mA |
| 电流 - 输出 / 通道： | 44mA |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 36 V，±1.5 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
AD823A
Data Sheet
Rev. | Page 14 of 20
THEORY OF OPERATION
The AD823A is a dual voltage feedback amplifier with an
N-channel JFET input stage and a rail-to-rail bipolar output
stage. It is fabricated on the Analog Devices, Inc. XFCB process,
a dielectrically isolated complementary bipolar process featuring
high speed 36 V bipolar devices along with JFETs and thin film
resistors. The N-channel input stage handles signals up to 200 mV
below the negative supply while maintaining picoamp level
input currents. The rail-to-rail output maximizes the amplifier’s
output range and can provide up to 40 mA linear drive current
with output voltages within .5 V of either power rail. Laser-
trimmed thin film resistors are used to optimize offset voltage
(3.5 mV max over the entire supply range) and offset voltage
drift (typical 1 uV/°C).
Figure 38 shows the architecture of an amplifier. Two stages are
used, with the first stage folded cascode input driving the
differential input of the second stage output. The voltage swing
at nodes S1p and S1n are kept small to minimize the generation
of nonlinear currents due to junction capacitances. This improves
distortion performance. Inputs and outputs of the amplifier are
fully protected with dedicated ESD diodes.
OUTPUT IMPEDANCE
The low frequency open-loop output impedance of the common-
emitter output stage used in this design is approximately 50 k.
Although this is significantly higher than a typical emitter follower
output stage, when it is connected with feedback, the open-loop
gain of the op amp reduces the output impedance.
With 105 dB of open-loop gain, the output impedance is reduced
to <0.01 . At higher frequencies, the output impedance rises as
the open-loop gain of the op amp drops; however, the output also
becomes capacitive due to the integrator capacitor. This
prevents the output impedance from ever becoming excessively
high (see Figure 21), which can cause stability problems when
driving capacitive loads. In fact, the AD823A has excellent
capacitive load drive capability for a high frequency op amp.
follower while driving a 470 pF direct capacitive load. Under
these conditions, the phase margin is approximately 35°. For a
greater phase margin, use a low value resistor in series with the
output to decouple the effect of the load capacitance from the
op amp (see Figure 28). In addition, running the part at higher
gains also improves the capacitive load drive capability of the
op amp.
09439-
138
+VS
–IN
+IN
OUT
–VS
VBIAS
S1P
S1N
OUTPUT
DRIVE
Figure 38. Simplified Schematic
B
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| AD823AARZ | 功能描述:IC OP AMP R-R FET 16MHZ 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.028 V/µs 增益带宽积:105kHz -3db带宽:- 电流 - 输入偏压:3nA 电压 - 输入偏移:100µV 电流 - 电源:3.3µA 电流 - 输出 / 通道:12mA 电压 - 电源，单路/双路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:剪切带 (CT) 其它名称:OP481GRUZ-REELCT |
| AD823AARZ_PROMO | 制造商:Analog Devices 功能描述:IC OP-AMP PREC 19MHZ 35V/U |
| AD823AARZ-R7 | 功能描述:IC OPAMP FET RR 17MHZ DUAL 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:3.5 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:30pA 电压 - 输入偏移:2000µV 电流 - 电源:200µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| AD823AARZ-RL | 功能描述:IC OPAMP FET RR 17MHZ DUAL 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:3.5 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:30pA 电压 - 输入偏移:2000µV 电流 - 电源:200µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| AD823AN | 制造商:Analog Devices 功能描述:OP Amp Dual GP R-R O/P 制造商:Rochester Electronics LLC 功能描述:DUAL FET R-TO-R 12MHZ AMP - Bulk 制造商:Analog Devices 功能描述:Operational Amplifier (Op-Amp) IC |
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