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參數(shù)資料
| 型號(hào)： | AD8235ACBZ-P7 |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 6/20頁(yè) |
| 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(yè)面： | 771 (CN2011-ZH PDF) |
| 其它名稱： | AD8235ACBZ-P7DKR |
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AD8235
Rev. 0 | Page 14 of 20
THEORY OF OPERATION
RG
RG
REF
VOUT
210k
52.5k
AD8235
–IN
+IN
B3
C3
+VS
A1
–VS
D1
A3
D3
B1
SDN
A2
C1
NC B2
NC D2
ESD
PROTECTION
ESD
PROTECTION
ESD
PROTECTION
ESD
PROTECTION
ESD
PROTECTION
ESD
PROTECTION
OP AMP
A
OP AMP
B
0
82
11
-03
4
Figure 35. Simplified Schematic
The AD8235 is a monolithic, two-op amp instrumentation
amplifier. It is designed for low power, portable applications
where size and low quiescent current are paramount. The
AD8235 is offered in a WLCSP package, minimizing layout
area. Additional features that make this part optimal for
portable applications include a rail-to-rail input and output
stage that offers more dynamic range when operating on low
voltage batteries. Unlike traditional rail-to-rail input amplifiers
that use a complementary differential pair stage and suffer from
nonlinearity, the AD8235 uses a novel architecture to internally
boost the supply rail, allowing the amplifier to operate rail-to-
rail yet still deliver a low 0.5 ppm of nonlinearity. In addition,
the two-op amp instrumentation amplifier architecture offers a
wide operational common-mode voltage range. Additional
information is provided in the Common-Mode Input Voltage
Range section. Precision, laser-trimmed resistors provide the
AD8235 with a high CMRR of 90 dB (minimum) at G = 5 and
gain accuracy of 0.05% (maximum).
AD8235
RG
+IN
+VS
5V
0.1F
–VS
VINP
SDN
GAIN SETTING
RESISTOR
VINM
OUT
REF
VREF
VOUT
RG
–IN
08
21
1-
0
35
BASIC OPERATION
The AD8235 amplifies the difference between its positive input
(+IN) and its negative input (IN). The REF pin allows the user
to level-shift the output signal. This is convenient when interfacing
to a filter or analog-to-digital converter (ADC). The basic setup
for operating the AD8235 with dual supplies. The equation for
the AD8235 is as follows:
VOUT = G × (VINP VINM) + VREF
If no gain setting resistor is installed, the default gain, G, is 5.
The Gain Selection section describes how to program the gain, G.
Figure 36. Basic Setup
GAIN SELECTION
Placing a resistor across the RG terminals sets the gain of the
AD8235. The gain may be derived by referring to Table 6 or by
using the following equation:
5
kΩ
420
=
G
R
G
Table 6. Gains Achieved Using 1% Resistors
1% Standard Table Value of RG (kΩ)
Calculated Gain
422
6.0
210
7.0
140
8.0
105
9.0
84.5
10.0
28
20.0
9.31
50.1
4.42
100.0
2.15
200.3
The AD8235 defaults to G = 5 when no gain resistor is used.
Gain accuracy is determined by the absolute tolerance of RG.
The TC of the external gain resistor increases the gain drift of
the instrumentation amplifier. Gain error and gain drift are at
a minimum when the gain resistor is not used.
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