参数资料
| 型号： | AD795JR-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP JFET 1.6MHZ LN 8SOIC |
| 标准包装： | 1,000 |
| 放大器类型： | J-FET |
| 电路数： | 1 |
| 转换速率： | 1 V/µs |
| -3db带宽： | 1.6MHz |
| 电流 - 输入偏压： | 1pA |
| 电压 - 输入偏移： | 100µV |
| 电流 - 电源： | 1.3mA |
| 电流 - 输出 / 通道： | 10mA |
| 电压 - 电源，单路/双路(±)： | 8 V ~ 36 V，±4 V ~ 18 V |
| 工作温度： | 0°C ~ 70°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： | 带卷 (TR) |
AD795
Rev. C | Page 13 of 20
Leakage through the bulk of the circuit board can still occur
with the guarding schemes shown in Figure 34 and Figure 35.
Standard G10 type PCB material may not have high enough
volume resistivity to hold leakages at the sub-picoampere level
particularly under high humidity conditions. One option that
eliminates all effects of board resistance is shown in Figure 36.
The AD795’s sensitive input pin (either Pin 2 when connected
as an inverter, or Pin 3 when connected as a follower) is bent up
and soldered directly to a Teflon insulated standoff. Both the
signal input and feedback component leads must also be
insulated from the circuit board by Teflon standoffs or low
leakage shielded cable.
00
84
5-
03
6
AD795
1
2
3
4
8
7
6
5
AD795
8
7
6
5
INPUT SIGNAL
LED
PC
BOARD
INPUT PIN:
PIN 2 FOR INVERTER
OR PIN 3 FOR FOLLOWER.
TEFLON INSULATED STANDOFF
Figure 36. Input Pin to Insulating Standoff
Contaminants such as solder flux on the board’s surface and on
the amplifier’s package can greatly reduce the insulation resistance
between the input pin and those traces with supply or signal
voltages. Both the package and the board must be kept clean
and dry. An effective cleaning procedure is to first swab the
surface with high grade isopropyl alcohol, then rinse it with
deionized water and, finally, bake it at 100°C for 1 hour. Poly-
propylene and polystyrene capacitors should not be subjected to
the 100°C bake because they can be damaged at temperatures
greater than 80°C.
Other guidelines include making the circuit layout as compact
as possible and reducing the length of input lines. Keeping
circuit board components rigid and minimizing vibration
reduce triboelectric and piezoelectric effects. All precision high
impedance circuitry requires shielding from electrical noise and
interference. For example, a ground plane should be used under
all high value (that is, greater than 1 MΩ) feedback resistors. In
some cases, a shield placed over the resistors, or even the entire
amplifier, may be needed to minimize electrical interference
originating from other circuits. Referring to the equation in
Figure 33, this coupling can take place in either, or both, of two
different forms via time varying fields:
P
C
dT
dV
or by injection of parasitic currents by changes in capacitance
due to mechanical vibration:
V
dT
dCp
Both proper shielding and rigid mechanical mounting of
components help minimize error currents from both of these
sources.
OFFSET NULLING
The circuit in Figure 37 can be used when the amplifier is used
as an inverter. This method introduces a small voltage in series
with the amplifier’s positive input terminal. The amplifier’s input
offset voltage drift with temperature is not affected. However,
variation of the power supply voltages causes offset shifts.
00
84
5-
03
7
3
6
2
AD795
+
–
VOUT
+VS
–VS
VI
RI
RF
499k
0.1F
200
100k
Figure 37. Alternate Offset Null Circuit for Inverter
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相关代理商/技术参数 |
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| AD795JRZ | 功能描述:IC OPAMP JFET 1.6MHZ LN 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:45nA 电压 - 输入偏移:2000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:40mA 电压 - 电源，单路/双路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作温度:0°C ~ 70°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:带卷 (TR) 其它名称:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD795JRZ-REEL | 功能描述:IC OPAMP JFET 1.6MHZ LN 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 |
| AD795JRZ-REEL7 | 功能描述:IC OPAMP JFET 1.6MHZ LN 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:73 系列:Over-The-Top® 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.07 V/µs 增益带宽积:200kHz -3db带宽:- 电流 - 输入偏压:1nA 电压 - 输入偏移:285µV 电流 - 电源:50µA 电流 - 输出 / 通道:25mA 电压 - 电源，单路/双路(±):2 V ~ 44 V，±1 V ~ 22 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-WFDFN 裸露焊盘 供应商设备封装:16-DFN-EP（5x3） 包装:管件 |
| AD795KN | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Power, Low Noise Precision FET Op Amp |
| AD795SH-883B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Feedback Operational Amplifier |
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