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參數(shù)資料
| 型號： | AD795JRZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP JFET 1.6MHZ LN 8SOIC |
| 標準包裝： | 1,000 |
| 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 14 of 20
AC RESPONSE WITH HIGH VALUE SOURCE AND FEEDBACK RESISTANCE
Source and feedback resistances greater than 100 kΩ magnifies
the effect of input capacitances (stray and inherent to the
AD795) on the ac behavior of the circuit. The effects of
common-mode and differential input capacitances should be
taken into account because the circuit’s bandwidth and stability
can be adversely affected.
In a follower, the source resistance, RS, and input common-
mode capacitance, CS (including capacitance due to board and
capacitance inherent to the AD795), form a pole that limits
pulse response from a 1 MΩ source resistance with the
amplifier’s input pin isolated from the board; only the effect of
the AD795’s input common-mode capacitance is seen.
0
08
45
-0
38
100
90
10
0%
10mV
5s
Figure 38. Follower Pulse Response from 1 MΩ Source Resistance
In an inverting configuration, the differential input capacitance
forms a pole in the circuit’s loop transmission. This can create
peaking in the ac response and possible instability. A feedback
capacitance can be used to stabilize the circuit. The inverter
pulse response with RF and RS equal to 1 MΩ and the input pin
isolated from the board appears in Figure 39. Figure 40 shows
the response of the same circuit with a 1 pF feedback
capacitance. Typical differential input capacitance for the
AD795 is 2 pF.
0
08
45
-0
39
100
90
10
0%
10mV
5s
Figure 39. Inverter Pulse Response with 1 MΩ Source and Feedback
Resistance
0
08
45
-0
40
100
90
10
0%
10mV
5s
Figure 40. Inverter Pulse Response with 1 MΩ Source and Feedback
Resistance, 1 pF Feedback Capacitance
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