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AD822AR-3V 参数 Datasheet PDF下载

AD822AR-3V图片预览
型号: AD822AR-3V
PDF下载: 下载PDF文件 查看货源
内容描述: 单电源,轨到轨低功耗FET输入运算放大器 [Single Supply, Rail-to-Rail Low Power FET-Input Op Amp]
分类和应用: 运算放大器
文件页数/大小: 16 页 / 322 K
品牌: ADI [ ADI ]
 浏览型号AD822AR-3V的Datasheet PDF文件第8页浏览型号AD822AR-3V的Datasheet PDF文件第9页浏览型号AD822AR-3V的Datasheet PDF文件第10页浏览型号AD822AR-3V的Datasheet PDF文件第11页浏览型号AD822AR-3V的Datasheet PDF文件第12页浏览型号AD822AR-3V的Datasheet PDF文件第13页浏览型号AD822AR-3V的Datasheet PDF文件第14页浏览型号AD822AR-3V的Datasheet PDF文件第16页  
AD822  
AP P LICATIO NS  
Table I. AD 822 In Am p P erform ance  
Single Supply Voltage-to-Fr equency Conver ter  
T he circuit shown in Figure 44 uses the AD822 to drive a low  
power timer, which produces a stable pulse of width t1. T he  
positive going output pulse is integrated by R1-C1 and used as  
one input to the AD822, which is connected as a differential  
integrator. T he other input (nonloading) is the unknown  
voltage, VIN. T he AD822 output drives the timer trigger input,  
closing the overall feedback loop.  
P aram eters  
VS = 3 V, 0 V  
VS = ؎5 V  
CMRR  
74 dB  
80 dB  
Common-Mode  
Voltage Range  
3 dB BW, G = 10  
G = 100  
–0.2 V to +2 V –5.2 V to +4 V  
180 kHz  
18 kHz  
180 kHz  
18 kHz  
tSET T LING  
2 V Step (VS = 0 V, 3 V)  
5 V (VS = ±5 V)  
Noise @ f = 1 kHz, G = 10  
2 µs  
+10V  
5 µs  
U4  
C5  
270 nV/Hz  
270 nV/Hz  
2.2 µV/Hz  
1.15 mA  
REF-02  
0.1µF  
2
VREF = 5V  
6
G = 100 2.2 µV/Hz  
CMOS  
ISUPPLY (T otal)  
1.10 mA  
3
5
RSCALE **  
10k  
OUT2  
OUT1  
74HCO4  
C3  
0.1µF  
U3A  
2
4
U3B  
4
3
1
5µs  
U2  
CMOS 555  
0.01µF, 2%  
100  
90  
4
8
R2  
R3*  
499k, 1%  
U1  
116k  
R
V+  
C1  
6
3
THR  
OUT  
1/2  
2
7
TR  
R1  
AD822B  
5
VIN  
CV  
DIS  
499k, 1%  
GND  
C6  
0V TO 2.5V  
FULL SCALE  
390pF  
1
C2  
5%  
C4  
0.01µF  
0.01µF, 2%  
10  
(NPO)  
0%  
NOTES:  
1V  
fOUT = VIN /(VREF*t1), t1 = 1.1*R3*C6  
= 25kHz fS AS SHOWN.  
* = 1% METAL FILM, <50ppm/°C TC  
** = 10%, 20T FILM, <100ppm/°C TC  
Figure 45a. Pulse Response of In Am p to a 500 m V p-p  
Input Signal; VS = +5 V, 0 V; Gain = 10  
t1 = 33µs FOR fOUT = 20kHz @ VIN = 2.0V  
R1  
R2  
9k  
R3  
1k  
R4  
1k  
R5  
9k  
R6  
Figure 44. Single Supply Voltage-to-Frequency Converter  
OHMTEK  
PART # 1043  
VREF  
90k  
90k  
T ypical AD822 bias currents of 2 pA allow megaohm-range  
source impedances with negligible dc errors. Linearity errors on  
the order of 0.01% full scale can be achieved with this circuit.  
T his performance is obtained with a 5 volt single supply which  
delivers less than 1 mA to the entire circuit.  
G =10  
G =100  
G =100  
G =10  
+VS  
1/2  
0.1µF  
Single Supply P rogram m able Gain Instrum entation Am plifier  
T he AD822 can be configured as a single supply instrumenta-  
tion amplifier that is able to operate from single supplies down  
to 3 V, or dual supplies up to ±15 V. Using only one AD822  
rather than three separate op amps, this circuit is cost and power  
efficient. AD822 FET inputs’ 2 pA bias currents minimize offset  
errors caused by high unbalanced source impedances.  
6
2
1
7
1/2  
AD822  
RP  
AD822  
5
3
VOUT  
VIN1  
VIN2  
4
1kΩ  
RP  
1kΩ  
R6  
R4 + R5  
(G =10) VOUT = (VIN1 –VIN2) (1+  
(G =100) VOUT = (VIN1 –VIN2) (1+  
) +VREF  
) +VREF  
R5 + R6  
R4  
An array of precision thin-film resistors sets the in amp gain to  
be either 10 or 100. T hese resistors are laser-trimmed to ratio  
match to 0.01%, and have a maximum differential T C of  
5 ppm/°C.  
FOR R1 = R6, R2 = R5, AND R3 = R4  
Figure 45b. A Single Supply Program m able  
Instrum entation Am plifier  
REV. A  
–15–