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| 型號： | AD8235ACBZ-P7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP INSTR RRIO 23KHZ 11WLCSP |
| 產(chǎn)品變化通告： | 8mm Carrier Tape Changes 28/Feb/2012 |
| 特色產(chǎn)品： | AD8235 Instrumentation Amplifier |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 0.011 V/µs |
| -3db帶寬： | 23kHz |
| 電流 - 輸入偏壓： | 1pA |
| 電壓 - 輸入偏移： | 2500µV |
| 電流 - 電源： | 30µA |
| 電流 - 輸出 / 通道： | 55mA |
| 電壓 - 電源，單路/雙路(±)： | 1.8 V ~ 5.5 V，±0.9 V ~ 2.75 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 11-WFBGA，WLCSP |
| 供應(yīng)商設(shè)備封裝： | 11-WLCSP（1.57x2.04） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 771 (CN2011-ZH PDF) |
| 其它名稱： | AD8235ACBZ-P7DKR |
AD8235
Rev. 0 | Page 17 of 20
R
1
fHIGH-PASS = 2πRC
TRANSFORMER
AC-COUPLED
REF
C
+VS
–VS
AD8235
REF
–VS
+VS
AD8235
TRANSFORMER
AC-COUPLED
REF
C
+VS
–VS
AD8235
REF
–VS
+VS
AD8235
0
821
1-
0
38
Figure 40. Creating an IBIAS Path
INPUT BIAS CURRENT RETURN PATH
The AD8235 input bias current is extremely small at less than
50 pA. Nonetheless, the input bias current must have a return
path to common. When the source, such as a transformer,
cannot provide a return current path, one should be created
(see Figure 40).
INPUT PROTECTION
All terminals of the AD8235 are protected against ESD. In addition,
the input structure allows for dc overload conditions a diode drop
above the positive supply and a diode drop below the negative
supply. Voltages beyond a diode drop of the supplies cause the
ESD diodes to conduct and enable current to flow through the
diode. Therefore, an external resistor should be used in series
with each of the inputs to limit current for voltages above +VS.
In either scenario, the AD8235 safely handles a continuous 6 mA
current at room temperature.
For applications where the AD8235 encounters extreme
overload voltages, as in cardiac defibrillators, external series
resistors and low leakage diode clamps, such as BAV199Ls,
FJH1100s, or SP720s, should be used.
RF INTERFERENCE
RF rectification is often a problem in applications where there are
large RF signals. The problem appears as a small dc offset voltage.
The AD8235, by its nature, has a 3.1 pF gate capacitance, CG, at
each input. Matched series resistors form a natural low-pass filter
that reduces rectification at high frequency (see Figure 41). The
relationship between external, matched series resistors and the
internal gate capacitance is expressed as
G
DIFF
RC
π
FilterFreq
2
1
=
G
CM
RC
π
FilterFreq
2
1
=
AD8235
VOUT
–VS
CG
–VS
+V
REF
S
–VS
R
+IN
–IN
0.1F
10F
0.1F
10F
SDN
82
11
-0
39
0
Figure 41. RFI Filtering Without External Capacitors
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