参数资料
型号: AD8251ARMZ-R7
厂商: Analog Devices Inc
文件页数: 14/24页
文件大小: 0K
描述: IC AMP INST ICMOS LDRIFT 10MSOP
标准包装: 1
系列: iCMOS®
放大器类型: 仪表
电路数: 1
转换速率: 30 V/µs
-3db带宽: 10MHz
电流 - 输入偏压: 5nA
电压 - 输入偏移: 70µV
电流 - 电源: 4.1mA
电流 - 输出 / 通道: 37mA
电压 - 电源,单路/双路(±): 10 V ~ 30 V,±5 V ~ 15 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 10-TFSOP,10-MSOP(0.118",3.00mm 宽)
供应商设备封装: 10-MSOP
包装: 标准包装
产品目录页面: 771 (CN2011-ZH PDF)
其它名称: AD8251ARMZ-R7DKR
AD8251
Rev. B | Page 21 of 24
APPLICATIONS
DIFFERENTIAL OUTPUT
In certain applications, it is necessary to create a differential
signal. High resolution ADCs often require a differential input.
In other cases, transmission over a long distance can require
differential signals for better immunity to interference.
Figure 61 shows how to configure the AD8251 to output a
differential signal. An op amp, the AD817, is used in an
inverting topology to create a differential voltage. VREF sets the
output midpoint according to the equation shown in the figure.
Errors from the op amp are common to both outputs and are
thus common mode. Likewise, errors from using mismatched
resistors cause a common-mode dc offset error. Such errors are
rejected in differential signal processing by differential input
ADCs or instrumentation amplifiers.
When using this circuit to drive a differential ADC, VREF can be
set using a resistor divider from the ADC reference to make the
output ratiometric with the ADC.
SETTING GAINS WITH A MICROCONTROLLER
+15V
MICRO-
CONTROLLER
–15V
A0
A1
WR
+IN
–IN
10
μF0.1F
10
μF0.1F
REF
AD8251
+
DGND
06
28
7-
0
59
Figure 60. Programming Gain Using a Microcontroller
+12V
–12V
A0
A1
WR
+IN
10
μF
0.1
μF
10
μF
0.1
μF
AD8251
REF
G = 1
0.1F
4.99k
4.99k
AD817
0.1F
+12V
–12V
VREF
0V
VOUTA = VIN + VREF
2
VOUTB = –VIN + VREF
+2.5V
–2.5V
0V
+2.5V
–2.5V
0V
TIME
AMPLITUDE
0V
TIME
AMPLITUDE
+5V
–5V
AMPLITUDE
10pF
+12V
–12V
VIN
+
+
DGND
06
28
7-
0
60
Figure 61. Differential Output with Level Shift
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AD8251ARZ 制造商:AD 制造商全称:Analog Devices 功能描述:12MHz 20V/us G=1,2,4,8 Programmable Gain iCMOS Instrumentation Amplifier
AD8251ARZ-R7 制造商:AD 制造商全称:Analog Devices 功能描述:12MHz 20V/us G=1,2,4,8 Programmable Gain iCMOS Instrumentation Amplifier
AD8251ARZ-RL 制造商:AD 制造商全称:Analog Devices 功能描述:12MHz 20V/us G=1,2,4,8 Programmable Gain iCMOS Instrumentation Amplifier
AD8251-EVAL 制造商:AD 制造商全称:Analog Devices 功能描述:12MHz 20V/us G=1,2,4,8 Programmable Gain iCMOS Instrumentation Amplifier