參數(shù)資料
型號(hào)： AD8251-EVALZ
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 10/24頁(yè)
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD8251 PGA
標(biāo)準(zhǔn)包裝： 1
系列： iCMOS®
每 IC 通道數(shù)： 1 - 單
放大器類(lèi)型： 儀表
輸出類(lèi)型： 單端
轉(zhuǎn)換速率： 20 V/µs
-3db帶寬： 10MHz
工作溫度： -40°C ~ 85°C
電流供應(yīng)（主 IC）： 4.1mA
電壓 - 電源，單路/雙路(±)： 5 V ~ 15 V
板類(lèi)型： 完全填充
已供物品： 板
已用 IC / 零件： AD8251
AD8251
Rev. B | Page 18 of 24
POWER SUPPLY REGULATION AND BYPASSING
The AD8251 has high PSRR. However, for optimal performance,
a stable dc voltage should be used to power the instrumentation
amplifier. Noise on the supply pins can adversely affect per-
formance. As in all linear circuits, bypass capacitors must be
used to decouple the amplifier.
Place a 0.1 μF capacitor close to each supply pin. A 10 μF tantalum
capacitor can be used farther away from the part (see Figure 55)
and, in most cases, it can be shared by other precision integrated
circuits.
AD8251
+VS
+IN
–IN
LOAD
REF
0.1F
10F
0.1F
10F
–VS
DGND
OUT
DGND
A0
A1
WR
06
28
7-
0
54
Figure 55. Supply Decoupling, REF, and Output Referred to Ground
INPUT BIAS CURRENT RETURN PATH
The AD8251 input bias current must have a return path to its
local analog ground. When the source, such as a thermocouple,
cannot provide a return current path, one should be created
(see Figure 56).
THERMOCOUPLE
+VS
REF
–VS
AD8251
CAPACITIVELY COUPLED
+VS
REF
C
–VS
AD8251
TRANSFORMER
+VS
REF
–VS
AD8251
INCORRECT
CAPACITIVELY COUPLED
+VS
REF
C
R
C
–VS
AD8251
1
fHIGH-PASS =
2
πRC
THERMOCOUPLE
+VS
REF
–VS
10M
AD8251
TRANSFORMER
+VS
REF
–VS
AD8251
CORRECT
06
28
7-
05
5
Figure 56. Creating an IBIAS Return Path
INPUT PROTECTION
All terminals of the AD8251 are protected against ESD. Note
that 2.2 kΩ series resistors precede the ESD diodes as shown in
Figure 51. The resistors limit current into the diodes and allow
for dc overload conditions 13 V above the positive supply and
13 V below the negative supply. An external resistor should be
used in series with each input to limit current for voltages
greater than 13 V beyond either supply rail. In either scenario,
the AD8251 safely handles a continuous 6 mA current at room
temperature. For applications where the AD8251 encounters
extreme overload voltages, external series resistors and low
leakage diode clamps, such as BAV199Ls, FJH1100s, or SP720s,
should be used.
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