- 您现在的位置：买卖IC网 > PDF目录5822 > AD8220BRMZ-R7 (Analog Devices Inc)IC AMP INST JFET R-R 15MA 8MSOP PDF资料下载
参数资料
| 型号： | AD8220BRMZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/28页 |
| 文件大小： | 0K |
| 描述： | IC AMP INST JFET R-R 15MA 8MSOP |
| 产品培训模块： | Power Line Monitoring |
| 设计资源： | Fully Isolated Input Module Based on AD7793, ADuM5401, and a High Performance In-Amp (CN0067) |
| 标准包装： | 1,000 |
| 放大器类型： | 仪表 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 2 V/µs |
| -3db带宽： | 1.5MHz |
| 电流 - 输入偏压： | 10pA |
| 电压 - 输入偏移： | 125µV |
| 电流 - 电源： | 750µA |
| 电流 - 输出 / 通道： | 15mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 36 V，±2.25 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页当前第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
AD8220
Rev. B | Page 22 of 28
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 AD8220 by its nature has a 5 pF gate capacitance, CG, at its
inputs. Matched series resistors form a natural low-pass filter that
reduces rectification at high frequency (see Figure 61). The
relationship between external, matched series resistors and the
internal gate capacitance is expressed as follows:
G
DIFF
RC
FilterFreq
π
2
1
G
CM
RC
FilterFreq
π
2
1
AD8220
VOUT
CG
–VS
REF
–VS
R
+IN
–IN
+15V
–15V
0.1F
10F
0.1F
10F
03
57
9-
0
30
Figure 61. RFI Filtering Without External Capacitors
To eliminate high frequency common-mode signals while using
smaller source resistors, a low-pass RC network can be placed at
the input of the instrumentation amplifier (see Figure 62). The
filter limits the input signal bandwidth according to the following
relationship:
)
2
(
π
2
1
G
C
D
DIFF
C
R
FilterFreq
)
(
π
2
1
G
C
CM
C
R
FilterFreq
Mismatched CC capacitors result in mismatched low-pass filters.
The imbalance causes the AD8220 to treat what would have
been a common-mode signal as a differential signal. To reduce
the effect of mismatched external CC capacitors, select a value of
CD greater than 10 times CC. This sets the differential filter
frequency lower than the common-mode frequency.
R
AD8220
+15V
+IN
–IN
0.1F
10F
0.1F
REF
VOUT
–15V
CD
CC
10nF
1nF
4.02k
03
57
9-
00
3
Figure 62. RFI Suppression
COMMON-MODE INPUT VOLTAGE RANGE
The common-mode input voltage range is a function of the
input range and the outputs of Internal Amplifier A1, Internal
Amplifier A2, and Internal Amplifier A3, the reference voltage,
and the gain. Figure 27 to Figure 30 show common-mode
voltage ranges for various supply voltages and gains.
DRIVING AN ADC
An instrumentation amplifier is often used in front of an ADC
to provide CMRR and additional conditioning, such as a voltage
level shift and gain (see Figure 63). In this example, a 2.7 nF
capacitor and a 1 kΩ resistor create an antialiasing filter for the
AD7685. The 2.7 nF capacitor also serves to store and deliver
the necessary charge to the switched capacitor input of the
ADC. The 1 kΩ series resistor reduces the burden of the 2.7 nF
load from the amplifier. However, large source impedance in
front of the ADC can degrade THD.
The example shown in Figure 63 is for sub-60 kHz applications.
For higher bandwidth applications where THD is important,
the series resistor needs to be small. At worst, a small series
resistor can load the AD8220, potentially causing the output to
overshoot or ring. In such cases, a buffer amplifier, such as the
AD8615, should be used after the AD8220 to drive the ADC.
AD8220
AD7685
4.7F
ADR435
+5V
2.7nF
REF
1k
1.07k
+2.5V
+IN
–IN
±50mV
+5V
0.1F
10F
0
357
9-
0
33
Figure 63. Driving an ADC in a Low Frequency Application
相关PDF资料 |
PDF描述 |
|---|---|
| 2-50871-2 | CONN SOCKET RCPT .056-.065 30AU |
| 5050863-5 | CONN SOCKET RCPT .014-.026 30AU |
| AD8139ARDZ-REEL7 | IC AMP DIFF R-R LN LDIST 8SOIC |
| LTC6082IGN#TRPBF | IC AMP R-R QUAD I/O 16-SSOP |
| FG450 | FUSE INDUST 450A 550V BS IEC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8220BRMZ-RL | 功能描述:IC AMP INST JFET R-R 15MA 8MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| AD8220-EVAL | 制造商:AD 制造商全称:Analog Devices 功能描述:JFET Input Instrumentation Amplifier with Rail-to-Rail Output in MSOP Package |
| AD8220-EVALZ | 制造商:Analog Devices 功能描述:Evaluation Board For JFET Instrumentation Amplifier Evaluation Board 制造商:Analog Devices 功能描述:JFET INSTRUMENTATION AMP EVAL BD - Bulk 制造商:Analog Devices 功能描述:AD8220 Evaluation Board |
| AD8220TRMZ-EP | 功能描述:IC OP AMP JFET RR 8MSOP 制造商:analog devices inc. 系列:- 包装:管件 零件状态:在售 放大器类型:J-FET 电路数:1 输出类型:满摆幅 压摆率:2 V/μs -3db 带宽:1.5MHz 电流 - 电源:750μA 电流 - 输出/通道:15mA 电压 - 电源，单/双（±）:4.5 V ~ 36 V，±2.25 V ~ 18 V 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商器件封装:8-MSOP 标准包装:50 |
| AD8220TRMZ-EP-R7 | 功能描述:IC OP AMP JFET RR 8MSOP 制造商:analog devices inc. 系列:- 包装:带卷（TR） 零件状态:在售 放大器类型:J-FET 电路数:1 输出类型:满摆幅 压摆率:2 V/μs -3db 带宽:1.5MHz 电流 - 电源:750μA 电压 - 电源，单/双（±）:4.5 V ~ 36 V，±2.25 V ~ 18 V 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商器件封装:8-MSOP 标准包装:1,000 |
发布紧急采购，3分钟左右您将得到回复。