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| 型号： | AD8293G80ARJZ-R2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC AMP INST R-R LDRIFT SOT23-8 |
| 标准包装： | 250 |
| 放大器类型： | 仪表 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| -3db带宽： | 500Hz |
| 电流 - 输入偏压： | 400pA |
| 电压 - 输入偏移： | 9µV |
| 电流 - 电源： | 1mA |
| 电流 - 输出 / 通道： | 35mA |
| 电压 - 电源，单路/双路(±)： | 1.8 V ~ 5.5 V，±0.9 V ~ 2.75 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 带卷 (TR) |
AD8293G80/AD8293G160
Rev. 0 | Page 11 of 16
APPLICATIONS INFORMATION
OVERVIEW
The AD8293G80/AD8293G160 reduce board area by integrating
filter components, such as Resistors R1, R2, and R3, as shown in
Figure 19. Two outputs are available to the user: OUT (Pin 6) and
ADC OUT (Pin 4). The difference between the two is the inclusion
of a series 5 kΩ resistor at ADC OUT. With the addition of an
external capacitor, C3, ADC OUT forms a second filter, comprising
of the 5 kΩ resistor and C3, which can be used as an ADC anti-
aliasing filter. In contrast, OUT is the direct output of the instru-
mentation amplifier. When using the antialiasing filter, there is
slightly less switching ripple at ADC OUT than when obtaining
the signal directly from OUT.
+5V
0.1F
+5V
1
8
7
5
6
4
ADC OUT
OUTPUT TO ADC
WITH ANTIALIASING
FILTER
FILT
+VS
–IN
+IN
R1
4k
R2
320k
R3
5k
100k
C3
39nF
OUT
C2
680pF
07
45
1-
0
2
1
AD8293G160
REF
GND
3
2
IN-AMP
Figure 19. AD8293G160 with Antialiasing Filter and Level-Shifted Output
(Using the Resistor Divider at the REF Pin, the Output Is Biased at 2.5 V)
REFERENCE CONNECTION
Unlike traditional 3-op-amp instrumentation amplifiers, parasitic
resistance in series with REF (Pin 3) does not degrade CMR
performance. The AD8293G80/AD8293G160 can attain extremely
high CMR performance without the use of an external buffer
amplifier to drive the REF pin, which is required by industry-
standard instrumentation amplifiers. Reducing the need for
buffer amplifiers to drive the REF pin helps to save valuable
printed circuit board (PCB) space and minimizes system costs.
For optimal performance in single-supply applications, REF
should be set with a low noise precision voltage reference, such
as the ADR44x (see Figure 20). However, for a lower system cost,
the reference voltage can be set with a simple resistor voltage
divider between the supply and GND (see Figure 19). This
configuration results in degraded output offset performance if
the resistors deviate from their ideal values. In dual-supply
applications, VREF can simply be connected to GND.
The REF pin current is approximately 10 pA, and as a result, an
external buffer is not required.
1F
0.1F
VOLTAGE
REFERENCE
+5V
0.1F
1
8
7
5
6
4
ADC OUT
OUTPUT
FILT
+VS
–IN
+IN
R1
4k
R2
R3
5k
OUT
C2
07
45
1-
02
2
AD8293Gxx
REF
GND
3
2
IN-AMP
Figure 20. Operating on a Single Supply Using an External Voltage Reference
(The Output Can Be Used Without an Antialiasing Filter if the Signal
Bandwidth Is <10 Hz)
OUTPUT FILTERING
The output of the AD8293G80/AD8293G160 can be filtered to
reduce switching ripple. Two filters can be used in conjunction
to set the filter frequency. In the example that follows, two 700 Hz
filters are used in conjunction to form a 500 Hz (recommended)
bandwidth. Because the filter resistors are integrated in the
AD8293G80/AD8293G160, only external capacitors are needed
to set the filter frequencies.
The primary filter is needed to limit the amount of switching
noise at the output. Regardless of the output that is being used,
OUT or ADC OUT, the primary filter comprising R2 and C2
must be implemented. The R2 value depends on the model; Table 7
shows the R2 value for each model.
Table 7. Internal R2 Values
Model
R2 (kΩ)
AD8293G80
160
AD8293G160
320
The following equation results in the C2 value needed to set a
700 Hz primary filter. For a gain of 160, substitute R2 with
320 kΩ; for a gain of 80, substitute R2 with 160 kΩ.
C2 = 1/(700 × 2 × π × R2)
Adding an external capacitor, C3, and measuring the output from
ADC OUT further reduces the correction ripple. The internal
5 kΩ resistor, labeled R3 in Figure 18, forms a low-pass filter
with C3. This low-pass filter is the secondary filter. Set to
700 Hz, the secondary filter equation for C3 is as follows:
C3 = 1/(700 × 2 × π × 5 kΩ)
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| AD8293G80ARJZ-R7 | 功能描述:IC AMP INST R-R LDRIFT SOT23-8 RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 产品培训模块:Differential Circuit Design Techniques for Communication Applications 标准包装:1 系列:- 放大器类型:RF/IF 差分 电路数:1 输出类型:差分 转换速率:9800 V/µs 增益带宽积:- -3db带宽:2.9GHz 电流 - 输入偏压:3µA 电压 - 输入偏移:- 电流 - 电源:40mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VQFN 裸露焊盘，CSP 供应商设备封装:16-LFCSP-VQ 包装:剪切带 (CT) 产品目录页面:551 (CN2011-ZH PDF) 其它名称:ADL5561ACPZ-R7CT |
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