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參數(shù)資料
| 型號(hào)： | OP97FS-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP LP PREC 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 0.2 V/µs |
| -3db帶寬： | 900kHz |
| 電流 - 輸入偏壓： | 30pA |
| 電壓 - 輸入偏移： | 30µV |
| 電流 - 電源： | 380µA |
| 電壓 - 電源，單路/雙路(±)： | ±2 V ~ 20 V |
| 工作溫度： | -40°C ~ 85°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： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | OP97FS-REEL7DKR |
OP97
Rev. G | Page 13 of 16
00
29
9-
03
GUARDING AND SHIELDING
To maintain the extremely high input impedances of the OP97,
care must be taken in circuit board layout and manufacturing.
Board surfaces must be kept scrupulously clean and free of
moisture. Conformal coating is recommended to provide a
humidity barrier. Even a clean PCB can have 100 pA of leakage
currents between adjacent traces; therefore, use guard rings
around the inputs. Guard traces are operated at a voltage close
to that on the inputs, so that leakage currents are minimal. In
noninverting applications, connect the guard ring to the common-
mode voltage at the inverting input (Pin 2). In inverting appli-
cations, both inputs remain at ground, so that the guard trace
should be grounded. Make guard traces on both sides of the
circuit board.
High impedance circuitry is extremely susceptible to RF pickup,
line frequency hum, and radiated noise from switching power
supplies. Enclosing sensitive analog sections within grounded
shields is generally necessary to prevent excessive noise pickup.
Twisted-pair cable aid in rejection of line frequency hum.
5
VOUT
OP97
2
3
6
IO
30pF
AD7548
RFB
DIGITAL
INPUTS
0
029
9-
0
36
Figure 35. DAC Output Amplifier
The OP97 is an excellent choice as an output amplifier for
higher resolution CMOS DACs. Its tightly trimmed offset
voltage and minimal bias current result in virtually no
degradation of linearity, even over wide temperature ranges.
Figure 36 shows a versatile monitor circuit that can typically
sense current at any point between the ±15 V supplies. This
makes it ideal for sensing current in applications such as full
bridge drivers where bidirectional current is associated with
large common-mode voltage changes. The 114 dB CMRR of the
OP97 makes the contribution of the amplifier to common-
mode error negligible, leaving only the error due to the resistor
ratio inequality. Ideally, R2/R4 = R3/R5.
VOUT
RL
IL
2
3
6
7
4
R3
10k
R2
10k
R4
10k
R5
10k
R1
10k
V1
OP97
+15V
–15V
00
29
9-
0
37
UNITY-GAIN FOLLOWE
Figure 36. Current Monitor
R
NONINVERTING AMPLIFIER
INVERTING AMPLIFIER
OP97
2
3
6
OP97
2
3
6
OP97
2
3
6
PDIP
BOTTOM VIEW
81
Figure 37. Guard Ring Layout and Connections
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