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参数资料
| 型号： | AD8139ARD |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 运算放大器 |
| 英文描述： | Low Noise Rail-to-Rail Differential ADC Driver |
| 中文描述： | OP-AMP, 500 uV OFFSET-MAX, PDSO8 |
| 封装： | MS-012, SOIC-8 |
| 文件页数： | 13/24页 |
| 文件大小： | 678K |
| 代理商： | AD8139ARD |
AD8139
Rev. B | Page 20 of 24
For proper operation, the voltages at VAN and VAP must stay
within their respective linear ranges.
Calculating Input Impedance
The input impedance of the circuit in Figure 59 depends on
whether the amplifier is being driven by a single-ended or a
differential signal source. For balanced differential input
signals, the differential input impedance (RIN, dm) is simply
RIN, dm = 2RG
(18)
For a single-ended signal (for example, when VIN is grounded
and the input signal drives VIP), the input impedance becomes
)
(
2
1
F
G
F
G
IN
R
+
=
(19)
The input impedance of a conventional inverting op amp
configuration is simply RG, but it is higher in Equation 19
because a fraction of the differential output voltage appears at
the summing junctions, VAN and VAP. This voltage partially
bootstraps the voltage across the input resistor RG, leading to
the increased input resistance.
Input Common-Mode Swing Considerations
In some single-ended-to-differential applications, when using a
single-supply voltage, attention must be paid to the swing of the
input common-mode voltage, VACM.
about a baseline at ground, and VREF is connected to ground.
The circuit has a differential gain of 1.6 and β = 0.38. VICM has
an amplitude of 2.5 V p-p and is swinging about ground. Using
the results in Equation 16, the common-mode voltage at the
inputs of the AD8139, VACM, is a 1.5 V p-p signal swinging
about a baseline of 0.95 V. The maximum negative excursion
of VACM in this case is 0.2 V, which exceeds the lower input
common-mode voltage limit.
DGND AGND REFGND REF REFBUFIN PDBUF
ADR431
2.5V
REFERENCE
47F
AD7674
IN+
IN–
AVDD
DVDD
AD8139
+
–
8
VREF
2.5V
2
1
6
3
4
5
VOCM
200
324
5V
20
15
VIN
2.7nF
0.1F
+1.7V
+0.95V
VACM
WITH VREF = 0
+0.2V
+2.5V
GND
–2.5V
046
79
-05
2
Figure 61. AD8139 Driving AD7674, 18-Bit, 800 kSPS ADC
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8139ARD-EBZ | 功能描述:BOARD EVAL FOR AD8139ARD RoHS:是 类别:编程器，开发系统 >> 评估板 - 运算放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
| AD8139ARD-REEL | 功能描述:IC AMP DIFF R-R LN LDIST 8SOIC RoHS:否 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:3.5 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:30pA 电压 - 输入偏移:2000µV 电流 - 电源:200µA 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:0°C ~ 70°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 |
| AD8139ARD-REEL7 | 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single R-R O/P 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single R-R O/P ±6V/12V 8-Pin SOIC N EP T/R |
| AD8139ARDZ | 功能描述:IC AMP DIFF R-R LN LDIST 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:45nA 电压 - 输入偏移:2000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:40mA 电压 - 电源，单路/双路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) 其它名称:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD8139ARDZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Noise Rail-to-Rail Differential ADC Driver |
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