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LM321
Semiconductor
Compiance
GENERAL DESCRIPTION
LM321 是一款单路输出的低功耗差分式运算放大器,
可以单电源或双电源供电。
具有较高的开环增益、
内部补偿、高共模范围和良好的温度稳定性,以及具有输出短路保护的特点。可应用于传感器的放大电路、
直流放大模块,音频放大电路和传统的运算放大电路中。
FEATURES
●
单电源电压范围:3V~36V
●
输出短路保护
●
双电源电压范围:±18V
●
低功耗:0.5mA @ V+=5V
●
单位增益带宽:可达 1.2MHZ
●
封装形式:SOT23-5
●
●
音频放大器
其它应用领域
APPLICATION
●
●
传感器信号放大器
直流增益
PIN CONFIGURATION
SOT23-5
SOT23-5 管脚序号
管脚定义
功能说明
1
IN+
正相输入
2
V-
电源负
3
IN-
反相输入
4
OUTPUT
输出
5
V+
电源正
极限参数
(1)
项目
符号
单电源供电电压
V+
40
V
双电源供电电压
Vs
±20
V
VIDR
±40
V
共模输入电压
VICR
-0.3~40V
V
输出短路时间
tsc
连续
耗散功率
PD
300
mW
工作温度
TA
0-70
℃
储存温度
TS
-65-150
℃
焊接温度
TW
260,10s
℃
(2)
差分输入电压
极限值
单位
注:
(1)极限值是指无论在任何条件下都不能超过的极限值。如果达到此极限值,将有可能造成产品劣化等物理性损
伤;同时在接近极限参数下,不能保证芯片可以正常工作。
(2)输入IN+与IN-之间的电压差。
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LM321
Semiconductor
Compiance
等效原理图
直流电学特性
(TA=25℃,V+ =5V,V- =GND 除非特别指定)
项目
符号
测试条件
最小值
典型值
最大值
单位
输入失调电压
VIO
V+ =5V to MAX,VIC=VICR(min),VO=1.4V
-
5
-
mV
输入失调电流
IIO
VO = 1.4 V
-
10
50
nA
偏置电流
IBIAS
VO = 1.4 V
-
50
250
nA
共模输入电压
VICR
V+=5V to 36V
V-
-
V+ -1.5V
V
开环电压增益
AOL
V+=15V,VO=1V to 11V,RL≥2kΩ
100
-
V/mV
共模抑制比
CMRR
V+=5V to MAX,VIC=VICR(min)
-
80
-
dB
单位增益带宽
GBWP
-
1.2
-
MHZ
电源电压抑制比 PSSR
∆VVDD/∆VIO
-
90
-
dB
Iout =-50uA
-
13.6
-
V
Iout =-1mA
-
13.5
-
V
Iout =-5mA
-
13.4
-
V
26
-
V
输出高电平电压
VOH
V+=5V to MAX, f=20kHz
V+ =15V, VID=1V
V+ =28V
输出低电平电压
VOL
RL=2k
Iout =50uA
-
0.1
-
V
Iout =1mA
-
0.7
-
V
Iout =5mA
-
1.0
-
V
RL=2k
-
0.85
-
V
V+ =5V,VO=1/2V+, No load
-
0.5
-
mA
V+ =36,VO=1/2V+, No load
-
0.8
-
mA
3
-
36
V
-18
-
+18
V
V+ =15V, VID=-1V
V+ =28V
电源工作电流
ICC
单电源工作电压
V+
V- =0V(GND)
双电源工作电压
VS
V+,V-
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LM321
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Compiance
典型应用
1、线路图
2、设计要求
必须选择大于输入电压范围和输出范围的电源电压。
例如,将信号源 VIN 从±0.5 V 放大到±1.8V。将电源设置为±5V 足以适应此应用要求。
3、设计过程
根据公式(1)计算放大倍数(增益) AV
AV =-VO/VIN
------(1)
AV =-VO/VIN=-1.8/0.5=-3.6
一旦确定了所需的增益 AV,就要为 RI 或 RF 电阻选择一个值。根据运放的电特性及功耗的需要,
可选择 1kΩ-100kΩ范围内的值。本例将选择 RI=10 kΩ,则 RF=36kΩ。这由方程式 2 确定。
AV =-RF/RI --------(2)
RF= -AV * RI=3.6*10 = 36 kΩ
4、应用曲线图
反相放大器的输入电压 VS 输出电压
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LM321
Semiconductor
Compiance
SOT23-5
单位:英寸/毫米
REEL SPECIFICATION
P/N
LM321
PKG
QTY
SOT-23-5
3000
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LM321
Semiconductor
Compiance
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