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參數(shù)資料
| 型號(hào)： | AD795JR-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP JFET 1.6MHZ LN 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | J-FET |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 1 V/µs |
| -3db帶寬： | 1.6MHz |
| 電流 - 輸入偏壓： | 1pA |
| 電壓 - 輸入偏移： | 100µV |
| 電流 - 電源： | 1.3mA |
| 電流 - 輸出 / 通道： | 10mA |
| 電壓 - 電源，單路/雙路(±)： | 8 V ~ 36 V，±4 V ~ 18 V |
| 工作溫度： | 0°C ~ 70°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) |
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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| AD795JR-REEL7 | 功能描述:IC OPAMP JFET 1.6MHZ LN 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| AD795JRZ | 功能描述:IC OPAMP JFET 1.6MHZ LN 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD795JRZ-REEL | 功能描述:IC OPAMP JFET 1.6MHZ LN 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 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:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
| AD795JRZ-REEL7 | 功能描述:IC OPAMP JFET 1.6MHZ LN 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:73 系列:Over-The-Top® 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:16-DFN-EP（5x3） 包裝:管件 |
| AD795KN | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Power, Low Noise Precision FET Op Amp |
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