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| 型號： | AD8421BRZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP INST 10MHZ LP LN 8MSOP |
| 標準包裝： | 2,500 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 35 V/µs |
| -3db帶寬： | 10MHz |
| 電流 - 輸入偏壓： | 100pA |
| 電壓 - 輸入偏移： | 25µV |
| 電流 - 電源： | 2mA |
| 電流 - 輸出 / 通道： | 65mA |
| 電壓 - 電源，單路/雙路(±)： | 5 V ~ 36 V，±2.5 V ~ 18 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） |
| 供應商設備封裝： | 8-SOICN |
| 包裝： | 帶卷 (TR) |
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AD8421
Data Sheet
Rev. 0 | Page 22 of 28
Reference Pin
The output voltage of the AD8421 is developed with respect to
the potential on the reference terminal. Ensure that REF is tied
to the appropriate local ground.
INPUT BIAS CURRENT RETURN PATH
The input bias current of the AD8421 must have a return path
to ground. When using a floating source without a current return
path (such as a thermocouple), create a current return path as
shown in Figure 65.
THERMOCOUPLE
+VS
REF
–VS
AD8421
CAPACITIVELY COUPLED
+VS
REF
C
–VS
AD8421
TRANSFORMER
+VS
REF
–VS
AD8421
INCORRECT
CAPACITIVELY COUPLED
+VS
REF
C
R
C
–VS
AD8421
1
fHIGH-PASS = 2πRC
THERMOCOUPLE
+VS
REF
–VS
10M
AD8421
TRANSFORMER
+VS
REF
–VS
AD8421
CORRECT
1
012
3-
061
Figure 65. Creating an Input Bias Current Return Path
INPUT VOLTAGES BEYOND THE SUPPLY RAILS
The AD8421 has very robust inputs. It typically does not need
additional input protection, as shown in Figure 66.
MOST APPLICATIONS
+VS
AD8421
–VS
I
VIN+
+
–
VIN+
+
–
1012
3-
062
Figure 66. Typical Application; No Input Protection Required
The AD8421 inputs are current limited; therefore, input voltages
can be up to 40 V from the opposite supply rail, with no input
protection required at all gains. For example, if +VS = +5 V and
VS = 8 V, the part can safely withstand voltages from 35 V to
+32 V.
The remaining AD8421 terminals should be kept within the
supplies. All terminals of the AD8421 are protected against ESD.
Input Voltages Beyond the Maximum Ratings
For applications where the AD8421 encounters voltages beyond the
limits in the Absolute Maximum Ratings table, external protection
is required. This external protection depends on the duration of
the overvoltage event and the noise performance that is required.
For short-lived events, transient protectors (such as metal oxide
varistors (MOVs)), may be all that is required.
+VS
AD8421
–VS
VIN+
+
–
VIN–
+
–
+VS
AD8421
RPROTECT
–VS
I
VIN+
+
–
VIN–
+
–
+VS
AD8421
RPROTECT
–VS
I
VIN+
+
–
VIN–
+
–
+VS
–VS
+VS
AD8421
RPROTECT
–VS
I
VIN+
+
–
VIN–
+
–
I
SIMPLE CONTINUOUS PROTECTION
TRANSIENT PROTECTION
LOW NOISE CONTINUOUS
OPTION 2
LOW NOISE CONTINUOUS
OPTION 1
1
012
3-
06
3
Figure 67. Input Protection Options for Input Voltages Beyond Absolute
For longer events, use resistors in series with the inputs, combined
with diodes. To avoid degrading bias current performance, low
leakage diodes such as the BAV199 or FJH1100 are recommended.
The diodes prevent the voltage at the input of the amplifier from
exceeding the maximum ratings, and the resistors limit the current
into the diodes. Because most external diodes can easily handle
100 mA or more, resistor values do not need to be large and,
therefore, have a minimal impact on noise performance.
At the expense of some noise performance, another solution is
to use series resistors. In the case of overvoltage, current into
inputs must be kept within the limits defined in the Absolute
Maximum Ratings section, the I × R drop across the protection
resistor increases the maximum voltage that the system can
withstand, as follows:
For positive input signals
VMAX_NEW = (40 V + Negative Supply) + IIN × RPROTECT
For negative input signals
VMIN_NEW = (Positive Supply 40 V) IOUT × RPROTECT
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