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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15页  
AD822  
+3V  
3
Low D r opout Bipolar Br idge D r iver  
T he AD822 can be used for driving a 350 ohm Wheatstone  
bridge. Figure 47 shows one half of the AD822 being used to  
buffer the AD589—a 1.235 V low power reference. T he output  
of +4.5 V can be used to drive an A/D converter front end. T he  
other half of the AD822 is configured as a unity-gain inverter,  
and generates the other bridge input of –4.5 V. Resistors R1 and  
R2 provide a constant current for bridge excitation. T he AD620  
low power instrumentation amplifier is used to condition the  
differential output voltage of the bridge. T he gain of the AD620  
is programmed using an external resistor RG, and determined  
by:  
0.1µF  
0.1µF  
95.3k  
47.5k  
1µF  
8
CHANNEL 1  
1/2  
AD822  
1
MYLAR  
500µF  
2
L
4.99k  
95.3k  
10k  
10k  
HEADPHONES  
32IMPEDANCE  
R
4.99k  
7
49.4 kΩ  
6
G =  
+1  
1/2  
47.5k  
1µF  
AD822  
RG  
500µF  
CHANNEL 2  
5
4
MYLAR  
+V  
S
49.9k  
Figure 46. 3 Volt Single Supply Stereo Headphone Driver  
R1  
20Ω  
+1.235V  
8
3
2
3 Volt, Single Supply Ster eo H eadphone D r iver  
T he AD822 exhibits good current drive and T HD+N perfor-  
mance, even at 3 V single supplies. At 1 kHz, total harmonic  
distortion plus noise (T HD+N) equals –62 dB (0.079%) for a  
300 mV p-p output signal. T his is comparable to other single  
supply op amps which consume more power and cannot run on  
3 V power supplies.  
1/2  
AD822  
TO A/D CONVERTER  
REFERENCE INPUT  
1
AD589  
26.4k, 1%  
350Ω  
10k  
1%  
+V  
S
350Ω  
7
3
2
AD620  
R
6
G
350Ω  
350Ω  
5
4
In Figure 46, each channel s input signal is coupled via a 1 µF  
Mylar capacitor. Resistor dividers set the dc voltage at the non-  
inverting inputs so that the output voltage is midway between  
the power supplies (+1.5 V). T he gain is 1.5. Each half of the  
AD822 can then be used to drive a headphone channel. A 5 Hz  
high-pass filter is realized by the 500 µF capacitors and the head-  
phones, which can be modeled as 32 ohm load resistors to  
ground. T his ensures that all signals in the audio frequency  
range (20 Hz–20 kHz) are delivered to the headphones.  
10k  
1%  
V
REF  
–V  
S
10k  
1%  
6
5
1/2  
AD822  
+V  
S
+5V  
–5V  
–4.5V  
7
1µF  
1µF  
0.1µF  
4
R2  
20Ω  
GND  
0.1µF  
+V  
S
–V  
S
Figure 47. Low Dropout Bipolar Bridge Driver  
O UTLINE D IMENSIO NS  
D imensions shown in inches and (mm).  
Mini-D IP (N) P ackage  
Cer dip (Q ) P ackage  
SO IC (R) P ackage  
0.005 (0.13) MIN  
0.055 (1.35) MAX  
0.150 (3.81)  
8
5
0.25  
(6.35)  
8
5
0.31  
8
1
5
4
PIN 1  
0.310 (7.87)  
0.244 (6.20)  
0.228 (5.79)  
(7.87)  
0.157 (3.99)  
0.150 (3.81)  
0.220 (5.59)  
1
4
1
4
PIN 1  
0.070 (1.78)  
0.030 (0.76)  
0.39 (9.91) MAX  
0.035±0.01  
(0.89±0.25)  
0.405 (10.29) MAX  
0.165±0.01  
(4.19±0.25)  
0.200  
0.060 (1.52)  
0.015 (0.38)  
0.197 (5.01)  
0.189 (4.80)  
(5.08)  
MAX  
0.18±0.03  
(4.57±0.76)  
0.125  
(3.18)  
MIN  
0.102 (2.59)  
0.094 (2.39)  
0.150  
(3.81)  
MIN  
0.010 (0.25)  
0.004 (0.10)  
0.200 (5.08)  
0.125 (3.18)  
0.10  
(2.54)  
0.018±0.003  
(0.46±0.08)  
0.033  
(0.84)  
NOM  
0.019 (0.48)  
0.014 (0.36)  
0.050  
(1.27)  
BSC  
SEATING  
PLANE  
SEATING  
PLANE  
0.023 (0.58)  
0.014 (0.36)  
0.100 (2.54)  
BSC  
BSC  
0.30 (7.62)  
REF  
0.320 (8.13)  
0.020 (0.051) x 45  
CHAMF  
°
0.290 (7.37)  
0.190 (4.82)  
0.170 (4.32)  
8
0
°
°
0.090  
(2.29)  
0.011±0.003  
(0.28±0.08)  
10  
°
0.015 (0.38)  
0.008 (0.20)  
0°  
0.030 (0.76)  
0.018 (0.46)  
0.098 (0.2482)  
0.075 (0.1905)  
15  
°
0
°
0°-15°  
REV. A  
–16–