AD542JH

更新时间： 2024-01-15 06:42:20

品牌	Logo	应用领域
亚德诺 - ADI		运算放大器放大器电路
页数	文件大小	规格书
12页	375K
描述
High Performance, BiFET Operational Amplifiers

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技术参数
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AD542JH 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	TO-99	包装说明：	HERMETICALLY SEALED, METAL CAN, TO-99, 8 PIN
针数：	8	Reach Compliance Code：	unknown
风险等级：	5.89	放大器类型：	OPERATIONAL AMPLIFIER
最大平均偏置电流 (IIB)：	0.000025 µA	标称共模抑制比：	80 dB
最大输入失调电压：	1000 µV	JESD-30 代码：	O-MBCY-W8
JESD-609代码：	e0	湿度敏感等级：	NOT SPECIFIED
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：	METAL
封装形状：	ROUND	封装形式：	CYLINDRICAL
峰值回流温度（摄氏度）：	NOT SPECIFIED	标称压摆率：	3 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：	BIPOLAR	温度等级：	MILITARY
端子面层：	TIN LEAD	端子形式：	WIRE
端子位置：	BOTTOM	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	Base Number Matches：	1

AD542JH 数据手册

AD542/AD544/AD547

The oscilloscope photo of Figure 31b shows the output of the

circuit of Figure 31a. The upper trace represents the reference

input, and the bottom trace shows the output voltage for a

digital input of all ones on the DAC (Gain 1–2^–n). The 47 pF

capacitor across the feedback resistor compensates for the DAC

output capacitance, and the 150 pF load capacitor serves to

minimize output glitches.

USING THE AD547 IN LOG AMPLIFIER APPLICATIONS

Log amplifiers or log ratio amplifiers are useful in applications

requiring compression of wide-range analog input data, linear-

ization of transducers having exponential outputs, and analog

computing, ranging from simple translation of natural relation-

ships in log form (e.g., computing absorbance as the log-ratio of

input currents), to the use of logarithms in facilitating analog

computation of terms involving arbitrary exponents and

multi-term products and ratios.

The picoamp level input current and low offset voltage of the

AD547 make it suitable for wide dynamic range log amplifiers.

Figure 33 is a schematic of a log ratio circuit employing the

AD547 that can achieve less than 1% conformance error over 5

decades of current input, 1 nA to 100 µA. For voltage inputs,

the dynamic range is typically 50 mV to 10 V for 1% error,

limited on the low end by the amplifiers’ input offset voltage.

Figure 31b. Voltage Output DAC Settling Characteristic

Figure 32a illustrates the 10-bit digital-to-analog converter,

AD7533, connected for bipolar operation. Since the digital

input can accept bipolar numbers and V_REFcan accept a bipolar

analog input, the circuit can perform a 4-quadrant multiplying

function.

Figure 33. Log-Ratio Amplifier

The conversion between current (or voltage) input and log out-

put is accomplished by the base emitter junctions of the dual

transistor Q1. Assuming Q1 has β > 100, which is the case for

the specified transistor, the base-emitter voltage on side 1 is to a

close approximation:

Figure 32a. AD544 Used as DAC Output Amplifiers

The photos exhibit the response to a step input at V_REF. Figure

32b is the large signal response and Figure 32c is the small sig-

nal response. C1 phase compensation (15 pF) is required for

stability when using high speed amplifiers. C1 is used to cancel

the pole formed by the DAC internal feedback resistance and

the output capacitance of the DAC.

_{BE A}= kT/q ln I₁/I_S1

This circuit is arranged to take the difference of the V_BE’s of

Q1A and Q1B, thus producing an output voltage proportional

to the log of the ratio of the inputs:

KkT

V_OUT= – K (V_{BE A}–V_{BE B}) = –

(ln I₁/I_S1– ln I₂/I_S2)

V_OUT= −K kT /q ln I₁/I₂

The scaling constant, K is set by R1 and R_TCto about 16, to

produce 1 V change in output voltage per decade difference in

input signals. R_TCis a special resistor with a +3500 ppm/°C

temperature coefficient, which makes K inversely proportional

to temperature, compensating for the “T” in kT/q. The log-

ratio transfer characteristic is therefore independent of

temperature.

Figure 32b. Large Signal

Response

Figure 32c. Small Signal

Response

REV. B

–9–

1...6 7 8910 11 12

中文翻译

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与AD542JH相关器件

型号	品牌	获取价格	描述	数据表
AD542JH/+	ADI	获取价格	IC IC,OP-AMP,SINGLE,BIPOLAR/JFET,CAN,8PIN,METAL, Operational Amplifier
AD542KCHIPS	ADI	获取价格	IC IC,OP-AMP,SINGLE,BIPOLAR/JFET,DIE, Operational Amplifier
AD542KH	ADI	获取价格	High Performance, BiFET Operational Amplifiers
AD542KH/+	ETC	获取价格	Operational Amplifier
AD542LH	ADI	获取价格	High Performance, BiFET Operational Amplifiers
AD542LH	ROCHESTER	获取价格	OP-AMP, 500uV OFFSET-MAX, 1MHz BAND WIDTH, MBCY8, HERMETICALLY SEALED, METAL CAN, TO-99, 8
AD542LH/+	ADI	获取价格	IC,OP-AMP,SINGLE,BIPOLAR/JFET,CAN,8PIN,METAL
AD542SCHIPS	ADI	获取价格	IC IC,OP-AMP,SINGLE,BIPOLAR/JFET,DIE, Operational Amplifier
AD542SH	ADI	获取价格	High Performance, BiFET Operational Amplifiers
AD542SH	ROCHESTER	获取价格	OP-AMP, 1000uV OFFSET-MAX, 1MHz BAND WIDTH, MBCY8, HERMETICALLY SEALED, METAL CAN, TO-99,

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