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AD548CH

更新时间： 2024-01-31 14:45:45
品牌 Logo 应用领域
亚德诺 - ADI 运算放大器
页数 文件大小 规格书
8页 200K
描述
IC OP-AMP, 400 uV OFFSET-MAX, 1 MHz BAND WIDTH, MBCY8, HERMETIC SEALED, METAL CAN, TO-99, 8 PIN, Operational Amplifier

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AD548CH 技术参数

是否无铅： 含铅是否Rohs认证： 不符合
生命周期：Active零件包装代码：DIP
包装说明：HERMETIC SEALED, CERDIP-8针数：8
Reach Compliance Code：unknown风险等级：5.45
放大器类型：OPERATIONAL AMPLIFIER最大平均偏置电流 (IIB)：0.00001 µA
标称共模抑制比：92 dB最大输入失调电压：500 µV
JESD-30 代码：R-GDIP-T8JESD-609代码：e0
湿度敏感等级：NOT SPECIFIED负供电电压上限：-18 V
标称负供电电压 (Vsup)：-15 V功能数量：1
端子数量：8最高工作温度：125 °C
最低工作温度：-55 °C封装主体材料：CERAMIC, GLASS-SEALED
封装代码：DIP封装形状：RECTANGULAR
封装形式：IN-LINE峰值回流温度（摄氏度）：NOT SPECIFIED
座面最大高度：5.08 mm标称压摆率：1.8 V/us
子类别：Operational Amplifier供电电压上限：18 V
标称供电电压 (Vsup)：15 V表面贴装：NO
技术：BIFET温度等级：MILITARY
端子面层：TIN LEAD端子形式：THROUGH-HOLE
端子节距：2.54 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT SPECIFIED标称均一增益带宽：1000 kHz
宽度：7.62 mmBase Number Matches：1

AD548CH 数据手册

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AD548  
Figure 22. Board Layout for Guarding Inputs  
Figure 24. AD548 Used as DAC Output Am plifier  
T hat is:  
INP UT P RO TECTIO N  
T he AD548 is guaranteed to withstand input voltages equal to  
the power supply potential. Exceeding the negative supply volt-  
age on either input will forward bias the substrate junction of  
the chip. T he induced current may destroy the amplifier due to  
excess heat.  
RFB  
RO  
VOS Output =VOS Input 1+  
RFB is the feedback resistor for the op amp, which is internal to  
the DAC. RO is the DAC’s R-2R ladder output resistance. T he  
value of RO is code dependent. T his has the effect of changing  
the offset error voltage at the amplifier’s output. An output am-  
plifier with a sub millivolt input offset voltage is needed to  
preserve the linearity of the DAC’s transfer function.  
Input protection is required in applications such as a flame  
detector in a gas chromatograph, where a very high potential  
may be applied to the input terminals during a sensor fault con-  
dition. Figure 23 shows a simple current limiting scheme that  
can be used. RPROT ECT should be chosen such that the maxi-  
mum overload current is 1.0 mA (l00 kΩ for a 100 V overload,  
for example).  
T he AD548 in this configuration provides a 700 kHz small sig-  
nal bandwidth and 1.8 V/µs typical slew rate. T he 33 pF capaci-  
tor across the feedback resistor optimizes the circuit’s response.  
T he oscilloscope photos in Figures 25 and 26 show small and  
large signal outputs of the circuit in Figure 24. Upper traces  
show the input signal VIN. Lower traces are the resulting output  
voltage with the DAC’s digital input set to all 1s. T he AD548  
settles to ±0.01% for a 20 V input step in 14 µs.  
Exceeding the negative common-mode range on either input  
terminal causes a phase reversal at the output, forcing the  
amplifier output to the corresponding high or low state. Exceed-  
ing the negative common-mode on both inputs simultaneously  
forces the output high. Exceeding the positive common-mode  
range on a single input doesn’t cause a phase reversal, but if  
both inputs exceed the limit the output will be forced high. In  
all cases, normal amplifier operation is resumed when input  
voltages are brought back within the common-mode range.  
5V  
20V  
5µS  
100  
90  
10  
0%  
Figure 25. Response to ±20 V p-p Reference Square Wave  
50mV  
200mV  
2µS  
Figure 23. Input Protection of IV Converter  
100  
90  
D /A CO NVERTER O UTP UT BUFFER  
T he circuit in Figure 24 shows the AD548 and AD7545 12-bit  
CMOS D/A converter in a unipolar binary configuration. VOUT  
will be equal to VREF attenuated by a factor depending on the  
digital word. VREF sets the full scale. Overall gain is trimmed by  
adjusting RIN. T he AD548’s low input offset voltage, low drift  
and clean dynamics make it an attractive low power output  
buffer.  
10  
0%  
Figure 26. Response to ±100 m V p-p Reference Square  
Wave  
T he input offset voltage of the AD548 output amplifier results  
in an output error voltage. T his error voltage equals the input  
offset voltage of the op amp times the noise gain of the  
amplifier.  
–6–  
REV. C  
1...345678

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