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參數(shù)資料
| 型號： | AD526 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Software Programmable Gain Amplifier(軟件可編程增益放大器) |
| 中文描述： | 軟件可編程增益放大器（軟件可編程增益放大器） |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 397K |
| 代理商： | AD526 |
AD526
REV. C
–8–
T he specifications on page 3 in combination with Figure 35 give
the timing requirements for loading new gain codes.
Figure 35. AD526 Timing
Figure 36. Using an External Latch to Minimize Digital
Feedthrough
T IMING AND CONT ROL
T able I. Logic Input T ruth T able
Gain Code
A2 A1 A0 B
Control
CLK
(
CS
= 0)
Condition
Gain
Condition
X
0
0
0
0
1
X
X
0
0
0
0
1
X
0
0
1
1
X
X
X
0
0
1
1
X
X
0
1
0
1
X
X
X
0
1
0
1
X
X
1
1
1
1
1
0
0
1
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
Previous State
1
2
4
8
16
1
1
1
2
4
8
16
Latched
T ransparent
T ransparent
T ransparent
T ransparent
T ransparent
T ransparent
Latched
Latched
Latched
Latched
Latched
Latched
NOT E: X = Don’t Care.
DIGIT AL FE E DT HROUGH
With either
CS
or
CLK
or both held high, the AD526 gain state
will remain constant regardless of the transitions at the A0, A1,
A2 or B inputs. However, high speed logic transitions will un-
avoidably feed through to the analog circuitry within the AD526
causing spikes to occur at the signal output.
T his feedthrough effect can be completely eliminated by operat-
ing the AD526 in the transparent mode and latching the gain
code in an external bank of latches (Figure 36).
T o operate the AD526 using serial inputs, the configuration
shown in Figure 36 can be used with the 74LS174 replaced by a
serial-in/parallel-out latch, such as the 54LS594.
GROUNDING AND BY PASSING
Proper signal and grounding techniques must be applied in
board layout so that specified performance levels of precision
data acquisition components, such as the AD526, are not
degraded.
As is shown in Figure 37, logic and signal grounds should be
separate. By connecting the signal source ground locally to the
AD526 analog ground Pins 5 and 6, gain accuracy of the
AD526 is maintained. T his ground connection should not be
corrupted by currents associated with other elements within the
system.
Utilizing the force and sense outputs of the AD526, as shown in
Figure 38, avoids signal drops along etch runs to low impedance
loads.
Figure 37. Grounding and Bypassing
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