参数资料
型号: AD8426ACPZ-WP
厂商: Analog Devices Inc
文件页数: 19/28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
AD8426
Rev. 0 | Page 26 of 28
Tips for Best Differential Output Performance
Keep trace lengths from resistors to the inverting terminal of
the op amp as short as possible. Excessive capacitance at this
node can cause the circuit to be unstable. If capacitance cannot
be avoided, use lower value resistors.
For best linearity and ac performance, a minimum positive supply
voltage (+VS) is required. Table 13 shows the minimum supply
voltage required for optimum performance, where VCM_MAX
indicates the maximum common-mode voltage expected at the
input of the AD8426.
Table 13. Minimum Positive Supply Voltage
Temperature
Equation
Less than 10°C
+VS > (VCM_MAX + VBIAS)/2 + 1.4 V
10°C to +25°C
+VS > (VCM_MAX + VBIAS)/2 + 1.25 V
More than +25°C
+VS > (VCM_MAX + VBIAS)/2 + 1.1 V
DRIVING A CABLE
All cables have a certain capacitance per unit length, which varies
widely with cable type. The capacitive load from the cable may
cause peaking in the output response of the AD8426. To reduce
the peaking, use a resistor between the AD8426 outputs and the
cable (see Figure 71). Because cable capacitance and desired output
response vary widely, this resistor is best determined empirically.
A good starting point is 50 Ω.
AD8426
09
49
0-
1
65
DIFFERENTIAL OUTPUT
SINGLE OUTPUT
Figure 71. Driving a Cable
The AD8426 operates at such a relatively low frequency that
transmission line effects are rarely an issue; therefore, the resistor
need not match the characteristic impedance of the cable.
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