Datasheet > AD548JR

AD548JR

更新时间： 2024-02-11 19:44:08

品牌	Logo	应用领域
罗彻斯特 - ROCHESTER		放大器光电二极管
页数	文件大小	规格书
13页	897K
描述
OP-AMP, 3000 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDSO8, SOIC-8

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AD548JR 技术参数

是否无铅：	含铅	生命周期：	Active
零件包装代码：	SOIC	包装说明：	SOP,
针数：	8	Reach Compliance Code：	unknown
风险等级：	5.08	Is Samacsys：	N
放大器类型：	OPERATIONAL AMPLIFIER	最大平均偏置电流 (IIB)：	0.00002 µA
标称共模抑制比：	84 dB	最大输入失调电压：	3000 µV
JESD-30 代码：	R-PDSO-G8	JESD-609代码：	e0
长度：	4.9 mm	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：	70 °C	最低工作温度：
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	NOT SPECIFIED	认证状态：	COMMERCIAL
座面最大高度：	1.75 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：	YES
技术：	BIPOLAR	温度等级：	COMMERCIAL
端子面层：	TIN LEAD	端子形式：	GULL WING
端子节距：	1.27 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：	3.9 mm	Base Number Matches：	1

AD548JR 数据手册

AD548

TPC 19a. Unity Gain Follower

TPC 19b. Unity Gain Follower

Pulse Response (Large Signal)

TPC 19c. Unity Gain Follower

Pulse Response (Small Signal)

TPC 20c. Unity Gain Inverter

Pulse Response (Small Signal)

TPC 20b. Utility Gain Inverter

Pulse Response (Large Signal)

TPC 20a. Utility Gain Inverter

APPLICATION NOTES

The AD548 is a JFET-input op amp with a guaranteed maxi-

mum I_Bof less than 10 pA, and offset and drift laser-trimmed to

0.5 mV and 5 µV/°C, respectively (AD548B). AC specs include

1 MHz bandwidth, 1.8 V/µs typical slew rate and 8 µs settling time

for a 20 V step to 0.01%—all at a supply current less than

200 µA. To capitalize on the device’s performance, a number of

error sources should be considered.

The minimal power drain and low offset drift of the AD548

reduce self-heating or “warm-up” effects on input offset voltage,

making the AD548 ideal for on/off battery-powered applica-

tions. The power dissipation due to the AD548’s 200 µA supply

current has a negligible effect on input current, but heavy out-

put loading will raise the chip temperature. Since a JFET’s

input current doubles for every 10°C rise in chip temperature,

this can be a noticeable effect.

Figure 1. Offset Null Configuration

LAYOUT

To take full advantage of the AD548’s 10 pA max input current,

parasitic leakages must be kept below an acceptable level. The

practical limit of the resistance of epoxy or phenolic circuit

board material is between 1 × 10¹²Ω and 3 × 10¹²Ω. This can

result in an additional leakage of 5 pA between an input of 0 V

and a –15 V supply line. Teflon^®or a similar low leakage mate-

rial (with a resistance exceeding 10¹⁷Ω) should be used to

isolate high impedance input lines from adjacent lines carrying

high voltages. The insulator should be kept clean, since con-

taminants will degrade the surface resistance.

The amplifier is designed to be functional with power supply

voltages as low as 4.5 V. It will exhibit a higher input offset

voltage than at the rated supply voltage of 15 V, due to power

supply rejection effects. The common-mode range of the AD548

extends from 3 V more positive than the negative supply to 1 V

more negative than the positive supply. Designed to cleanly

drive up to 10 kΩ and 100 pF loads, the AD548 will drive a 2

kΩ load with reduced open-loop gain.

A metal guard completely surrounding the high impedance nodes

and driven by a voltage near the common-mode input potential

can also be used to reduce some parasitic leakages. The guarding

pattern in Figure 2 will reduce parasitic leakage due to finite

board surface resistance; but it will not compensate for a low

volume resistivity board.

OFFSET NULLING

Unlike bipolar input amplifiers, zeroing the input offset voltage

of a BiFET op amp will not minimize offset drift. Using balance

Pins 1 and 5 to adjust the input offset voltage as shown in

Figure 1 will induce an added drift of 0.24 µV/°C per 100 µV of

nulled offset. The low initial offset (0.5 mV) of the AD548B

results in only 0.6 µV/°C of additional drift.

Teflon is a registered trademark of DuPont.

REV. D

–7–

1...5 6 789 10 11...13

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AD548JR-REEL	ADI	Precision, Low Power BiFET Op Amp	获取价格
AD548JR-REEL7	ROCHESTER	OP-AMP, 3000 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDSO8, SOIC-8	获取价格
AD548JR-REEL7	ADI	IC OP-AMP, 3000 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDSO8, SOIC-8, Operational Amplifier	获取价格
AD548JRZ	ADI	Precision, Low Power BiFET Op Amp	获取价格
AD548JRZ	ROCHESTER	OP-AMP, 3000 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDSO8, SOIC-8	获取价格
AD548JRZ-REEL	ROCHESTER	OP-AMP, 3000 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDSO8, SOIC-8	获取价格

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