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參數(shù)資料
| 型號(hào)： | HA-5320883 |
| 廠商： | Intersil Corporation |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | High Speed Precision Sample and Hold Amplifier |
| 中文描述： | 高速精密采樣保持放大器 |
| 文件頁數(shù)： | 4/7頁 |
| 文件大小： | 85K |
| 代理商： | HA-5320883 |
4
Application Information
The HA-5320 has the uncommitted differential inputs of an
op amp, allowing the Sample and Hold function to be
combined with many conventional op amp circuits. See the
Intersil Application Note AN517 for a collection of circuit
ideas.
Layout
A printed circuit board with ground plane is recommended
for best performance. Bypass capacitors (0.01
μ
F to 0.1
μ
F,
ceramic) should be provided from each power supply
terminal to the Supply Ground terminal on pin 13.
The ideal ground connections are pin 6 (SIG. Ground)
directly to the system Signal Ground, and pin 13 (Supply
Ground) directly to the system Supply Common.
Hold Capacitor
The HA-5320 includes a 100pF MOS hold capacitor,
sufficient for most high speed applications (the Electrical
Specifications section is based on this internal capacitor).
Additional capacitance may be added between pins 7 and
11. This external hold capacitance will reduce droop rate at
the expense of acquisition time, and provide other trade-offs
as shown in the Performance Curves.
If an external hold capacitor C
EXT
is used, then a noise
bandwidth capacitor of value 0.1C
EXT
should be connected
from pin 8 to ground. Exact value and type are not critical.
The hold capacitor C
EXT
should have high insulation
resistance and low dielectric absorption, to minimize droop
errors. Polystyrene dielectric is a good choice for operating
temperatures up to 85
o
C. Teflon and glass dielectrics offer
good performance to 125
o
C and above.
Test Circuits and Waveforms
FIGURE 1. CHARGE TRANSFER AND DRIFT CURRENT
FIGURE 2. CHARGE TRANSFER TEST
FIGURE 3. DRIFT CURRENT TEST
FIGURE 4. HOLD MODE FEEDTHROUGH ATTENUATION
14
2
1
7
8
11
NC
NC
-INPUT
+INPUT
S/H CONTROL
CONTROL
INPUT
S/H
OUTPUT
V
O
(C
H
= 100pF)
HA-5320
S/H CONTROL
V
O
V
P
HOLD (+3.5V)
SAMPLE (0V)
NOTES:
13. Observe the “hold step” voltage V
P
.
14. Compute charge transfer: Q = V
P
C
H
.
S/H CONTROL
V
O
V
O
t
NOTES:
15. Observe the voltage “droop”,
V
O
/
t.
16. Measure the slope of the output during hold,
V
O
/
t, and
compute drift current: I
D
= C
H
V
O
/
t.
HOLD (+3.5V)
SAMPLE (0V)
VIN
ANALOG
MUX OR
SWITCH
A
IN
S/H CONTROL
SUPPLY
GND
+IN
-IN
OUT
V
OUT
7
1
2
14
V-
V+
S/H CONTROL
INPUT
9
5
10V
SINE WAVE
P-P
C
EXT
TO
SIGNAL
GND
TO
SUPPLY
COMMON
NC
13
11
6
NC
8
INT.
COMP.
REF
COM
HA-5320
NOTE:
Feedthrough in
where:
V
OUT
= V
P-P
, Hold Mode, V
IN
= V
P-P
.
dB
20
V
IN
--------------
log
=
HA-5320
Teflon is a registered Trademark of Dupont Corporation.
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