参数资料
| 型号： | AD8426ACPZ-WP |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/28页 |
| 文件大小： | 0K |
| 描述： | IC AMP INSTR RR 1.5MHZ 16LFCSP |
| 标准包装： | 64 |
| 放大器类型： | 仪表 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.6 V/µs |
| -3db带宽： | 1MHz |
| 电流 - 输入偏压： | 20nA |
| 电压 - 输入偏移： | 200µV |
| 电流 - 电源： | 350µA |
| 电流 - 输出 / 通道： | 13mA |
| 电压 - 电源，单路/双路(±)： | 2.2 V ~ 36 V，±1.35 V ~ 18 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VQFN，CSP |
| 供应商设备封装： | 16-LFCSP（4x4） |
| 包装： | 托盘 - 晶粒 |
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AD8426
Rev. 0 | Page 25 of 28
APPLICATIONS INFORMATION
PRECISION STRAIN GAGE
The low offset and high CMRR over frequency of the AD8426
make it an excellent candidate for bridge measurements. The
bridge can be connected directly to the inputs of the amplifier
(see Figure 68).
5V
2.5V
10F
0.1F
AD8426
+IN
–IN
RG
350
+
–
09
49
0-
01
0
Figure 68. Precision Strain Gage
DIFFERENTIAL DRIVE
The differential output configuration of the AD8426 has the
same excellent dc precision specifications as the single-ended
output configuration.
Differential Output Using Both AD8426 Amplifiers
The circuit configuration is shown in Figure 69. The differential
refer to this configuration only. The circuit includes an RC filter
that maintains the stability of the loop.
+IN1
–IN1
AD8426
+
–
AD8426
+
–
100pF
+INx
VOUT–
VOUT+
10k
REF2
09
49
0-
16
3
RG
Figure 69. Differential Circuit Schematic
The differential output voltage is set by the following equation:
VDIFF_OUT = VOUT+ VOUT = G × (VIN+ VIN)
where:
G
R
G
Ω
+
=
k
4
.
49
1
The common-mode output voltage is set by the average of +IN2
and REF2. The transfer function is
VCM_OUT = (VOUT+ + VOUT)/2 = (V+IN2 + VREF2)/2
A common application sets the common-mode output voltage
to the midscale of a differential ADC. In this case, the ADC
reference voltage is sent to the +IN2 terminal, and ground is
connected to the REF2 terminal. This produces a common-
mode output voltage of half the ADC reference voltage.
2-Channel Differential Output Using a Dual Op Amp
Another differential output topology is shown in Figure 70.
Instead of a second in-amp, one-half of a dual op amp creates
the inverted output. The recommended dual op amps (the
configuration allows the creation of a dual-channel, precision
differential output in-amp with little board area.
output.
+IN
–IN
REF
AD8426
VBIAS
R
+
–
OP AMP
VOUT+
VOUT–
R
RECOMMENDED OP AMPS: AD8642, AD822.
RECOMMENDED R VALUES: 5k TO 20k.
09
49
0-
0
09
Figure 70. Differential Output Using an Op Amp
The differential output voltage is set by the following equation:
VDIFF_OUT = VOUT+ VOUT = G × (VIN+ VIN)
where:
G
R
G
Ω
+
=
k
4
.
49
1
The common-mode output voltage is set by the following
equation:
VCM_OUT = (VOUT+ VOUT)/2 = VBIAS
The advantage of this circuit is that the dc differential accuracy
depends on the AD8426 and not on the op amp or the resistors.
This circuit takes advantage of the precise control of the AD8426
over its output voltage relative to the reference voltage. Op amp
dc performance and resistor matching do affect the dc common-
mode output accuracy. However, because common-mode errors
are likely to be rejected by the next device in the signal chain, these
errors typically have little effect on overall system accuracy.
For best ac performance, an op amp with gain bandwidth of at
least 2 MHz and a slew rate of at least 1 V/μs is recommended.
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相关代理商/技术参数 |
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| AD8426BCPZ-R7 | 功能描述:IC AMP INSTR RR 1.5MHZ 16LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:73 系列:Over-The-Top® 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.07 V/µs 增益带宽积:200kHz -3db带宽:- 电流 - 输入偏压:1nA 电压 - 输入偏移:285µV 电流 - 电源:50µA 电流 - 输出 / 通道:25mA 电压 - 电源，单路/双路(±):2 V ~ 44 V，±1 V ~ 22 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-WFDFN 裸露焊盘 供应商设备封装:16-DFN-EP（5x3） 包装:管件 |
| AD8426BCPZ-R7_PROMO | 制造商:Analog Devices 功能描述:INSTR-AMPLIFIER 1MHZ 90DB L |
| AD8426BCPZ-WP | 功能描述:IC AMP INSTR RR 1.5MHZ 16LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:150 系列:- 放大器类型:音频 电路数:2 输出类型:- 转换速率:5 V/µs 增益带宽积:12MHz -3db带宽:- 电流 - 输入偏压:100nA 电压 - 输入偏移:500µV 电流 - 电源:6mA 电流 - 输出 / 通道:50mA 电压 - 电源，单路/双路(±):4 V ~ 32 V，±2 V ~ 16 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:8-TSSOP 包装:管件 |
| AD8428 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Noise, Low Gain Drift, G = 2000 |
| AD8428_12 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Noise, Low Gain Drift, G = 2000 |
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