参数资料
型号: AD8512ARZ-REEL7
厂商: Analog Devices Inc
文件页数: 8/20页
文件大小: 0K
描述: IC OPAMP JFET 8MHZ DUAL LN 8SOIC
设计资源: Precision, Bipolar Configuration for the AD5546/56 DAC (CN0024)
Precision, Bipolar, Configuration for AD5547/AD5557 DAC (CN0028)
标准包装: 1,000
放大器类型: J-FET
电路数: 2
转换速率: 20 V/µs
增益带宽积: 8MHz
电流 - 输入偏压: 25pA
电压 - 输入偏移: 100µV
电流 - 电源: 2.2mA
电流 - 输出 / 通道: 70mA
电压 - 电源,单路/双路(±): ±4.5 V ~ 18 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SO
包装: 带卷 (TR)
AD8510/AD8512/AD8513
Rev. I | Page 16 of 20
PRECISION RECTIFIERS
TIME (1ms/DIV)
VOL
TA
G
E
(
1V/
D
IV)
02
72
9-
04
6
Rectifying circuits are used in a multitude of applications. One
of the most popular uses is in the design of regulated power
supplies, where a rectifier circuit is used to convert an input
sinusoid to a unipolar output voltage.
However, there are some potential problems with amplifiers
used in this manner. When the input voltage (VIN) is negative,
the output is zero, and the magnitude of VIN is doubled at the
inputs of the op amp. If this voltage exceeds the power supply
voltage, it may permanently damage some amplifiers. In addition,
the op amp must come out of saturation when VIN is negative.
This delays the output signal because the amplifier requires
time to enter its linear region.
Although the AD8510/AD8512/AD8513 have a very fast
overdrive recovery time, which makes them great choices for the
rectification of transient signals, the symmetry of the positive
and negative recovery times is also important to keep the output
signal undistorted.
Figure 51. Half-Wave Rectifier Signal (OUT A in Figure 50)
TIME (1ms/DIV)
VO
LT
A
G
E
(
1V/
D
IV)
02
72
9-
0
47
Figure 50 shows the test circuit of the rectifier. The first stage of
the circuit is a half-wave rectifier. When the sine wave applied at
the input is positive, the output follows the input response.
During the negative cycle of the input, the output tries to swing
negative to follow the input, but the power supply restrains it to
zero. In a similar fashion, the second stage is a follower during
the positive cycle of the sine wave and an inverter during the
negative cycle.
8
4
2
1
3
1/2
AD8512
4
8
5
7
6
2/2
AD8512
R2
10k
R3
10k
R1
1k
OUT A
(HALF WAVE)
OUT B
(FULL WAVE)
10V
VIN
3V p-p
02729-
045
Figure 52. Full-Wave Rectifier Signal (OUT B in Figure 50)
Figure 50. Half-Wave and Full-Wave Rectifiers
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