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參數資料
| 型號： | AR8618ARU |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:8; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:24; Circular Contact Gender:Socket; Circular Shell Style:Cable Receptacle; Insert Arrangement:24-6 RoHS Compliant: No |
| 中文描述： | 精密20兆赫的CMOS軌到軌輸入/輸出運算放大器 |
| 文件頁數： | 13/16頁 |
| 文件大小： | 495K |
| 代理商： | AR8618ARU |
AD8616/AD8618
OVERLOAD RECOVERY TIME
Overload recovery time is the time it takes the output of the
amplifier to come out of saturation and recover to its linear
region. Overload recovery is particularly important in
applications where small signals must be amplified in the
presence of large transients. Figure 42 and Figure 43 show the
positive and negative overload recovery times of the AD8616. In
both cases, the time elapsed before the AD8616 comes out of
saturation is less than 1 μs. In addition, the symmetry between
the positive and negative recovery times allows for excellent
signal rectification without distortion to the output signal.
Rev. A | Page 13 of 16
TIME (1
μ
s/DIV)
V
S
= ±2.5V
R
L
= 10k
A
V
= 100
V
IN
= 50mV
–50mV
+2.5V
0V
0V
0
Figure 42. Positive Overload Recovery
TIME (1
μ
s/DIV)
V
S
= ±2.5V
R
L
= 10k
A
V
= 100
V
IN
= 50mV
+50mV
–2.5V
0V
0V
0
Figure 43. Negative Overload Recovery
D/A CONVERSION
The AD8616 can be used at the output of high resolution DACs.
Their low offset voltage, fast slew rate, and fast settling time
make the parts suitable to buffer voltage output or current
output DACs.
Figure 44 shows an example of the AD8616 at the output of the
AD5542. The AD8616’s rail-to-rail output and low distortion
help maintain the accuracy needed in data acquisition systems
and automated test equipment.
AD5542
V
OUT
UNIPOLAR
OUTPUT
AGND
DGND
REFS
1/2
AD8616
REFF
V
DD
SERIAL
INTERFACE
0.1
μ
F
0.1
μ
F
10
μ
F
+
5V
2.5V
CS
DIN
SCLK
LDAC*
0
Figure 44. Buffering DAC Output
LOW NOISE APPLICATIONS
Although the AD8618 typically has less than 8 nV/√Hz of
voltage noise density at 1 kHz, it is possible to reduce it further.
A simple method is to connect the amplifiers in parallel, as
shown in Figure 45. The total noise at the output is divided by
the square root of the number of amplifiers. In this case, the
total noise is approximately 4 nV/√Hz at room temperature.
The 100 resistor limits the current and provides an effective
output resistance of 50 .
V–
R3
100
R1
10
V+
V
IN
0
3
2
1
R2
1k
V–
R6
100
R4
10
V+
3
2
1
R5
1k
V–
R9
100
R7
10
V+
3
2
1
R8
1k
V–
R12
100
R10
10
V+
3
2
1
R11
1k
V
OUT
Figure 45. Noise Reduction
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