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參數(shù)資料
| 型號(hào)： | AD8026AR-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Quad High Speed Amplifier |
| 中文描述： | QUAD OP-AMP, 6000 uV OFFSET-MAX, PDSO14 |
| 封裝： | PLASTIC, SOIC-14 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 217K |
| 代理商： | AD8026AR-REEL |
AD8026
–7–
REV. 0
In a system application, the part is designed assuming that each
–Input will be driven from a low impedance source, while each
+Input will be driven by a current-output DAC with a 500
termination resistor. Thus, to first order, each on-chip series
input resistor to each +Input is 500
less than the parallel
combination of the gain-setting resistors. The offset-inducing
effect of the bias currents is minimized by this scheme.
Figure 18 shows how to drive the AD8026 with a fixed positive
gain of 8/3 from a current output DAC. The gain and offset
errors are minimized by using a 500
resistor (R
I
) to convert
the DAC output current into a voltage. The gain resistor (R
G
)
should be directly connected to ground, or driven from a low
output impedance source to ensure minimum offset and maxi-
mum gain accuracy.
If the +Input of any of the op amps is driven from a voltage
source, the low offset voltage of the AD8026 can be maintained
by adding a series resistance of 500
between the source and
the +Input to the AD8026. This is illustrated in Figure 19. If
the –Input is to be driven, such as when creating an offset volt-
age, then a low source impedance should be provided in order
to maintain both gain and offset accuracy.
+I
B
–I
B
R
P
1/4 AD8026
R
F
R
G
R
I
500
V
V
IN
CURRENT-
OUTPUT
DAC
V
OUT
–V
S
10
m
F
0.1
m
F
+V
S
R
S
C
L
10
m
F
0.1
m
F
Figure 18. Low Offset and High Gain Accuracy Circuit for
Driving the AD8026 from a Current Output DAC
VOLTAGE-
OUTPUT
DRIVER
+I
B
–I
B
R
P
1/4 AD8026
R
F
R
G
R
I
500
V
V
IN
V
OUT
–V
S
10
m
F
0.1
m
F
+V
S
R
S
C
L
10
m
F
0.1
m
F
Figure 19. Low Offset and High Gain Accuracy Circuit for
Driving the AD8026 from a Voltage Source
QUAD AMPLIFIER CHARACTERIZATION BOARD
Figure 20. Component Side
Figure 21. Solder Side
Figure 22. Silkscreen
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