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參數(shù)資料
| 型號(hào)： | HMC109 |
| 英文描述： | Analog Attenuator |
| 中文描述： | 模擬衰減器 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 190K |
| 代理商： | HMC109 |
HMC10XX FAMILY
11
Low Power—For low power application, down to 3.3 volt
supply, the circuit shown in Figure 14 can be used. These
low threshold FETs provide low on-resistance (0.3W) at
V
GS
=2.7V. The set/reset pulsing does not need to be
continuous. To save power, the SET pulse can be initially
applied followed by a single RESET pulse. The offset (OS)
can be calculated as:
OS = (Vset + Vrst)/2
This offset term will contain the DC offset of both the sensor
bridge and interface electronics, as well as the temperature
drift of the bridge and interface electronics. Store this value
and subtract it from all future bridge output readings. Once
the bridge is RESET, it will remain in that state for years—
or until a disturbing field (>20 gauss) is applied. A timer can
be set, say every 10 minutes, to periodically update the
offset term. A flow chart is shown in Figure 13 along with a
timing diagram in Figure 14 to illustrate this process.
Figure 13—Low Power Set/Rst Flowchart
Figure 12—Set/Reset Pulse With Clock Control(1021/1022)
9,15
1μF (1)
+5 to 15V
14
HMC1022
Clock
S/R
1
2
4
3
5,6
7,8
(1) Tantalum, low R
(2) Rds ~0.2 ohm
200
8
set
rst
set
Clock
S/R
4 to14V
-4 to -14V
T
PW ~ 2 μsec
5V
set
reset
IRF7105 (2)
DI9952 (2)
0.1μF
Figure 14—Single Clock Set/Reset Pulse Circuit (1021/1022)
T
a
Reset
Set
S/R
Vp
-Vp
T
a > 5 μsec
T
b > 1 μsec
T
c > 20 μsec, 50 msec(max)
T
d > 20 μsec
T
PW ~ 2 μsec
Vp > 3 V
T
PW
set
reset
T
b
T
a
T
c
read
Vset
read
Vrst
T
d
T
d
Vout
1μF (1)
+3.3 to 6.5V
Reset
NDS9933
2,4
1,3
5,6,7,8
(1) Tantalum, low R
(2) Rds ~0.2 ohm
NDS8926
Set
200
5,6,7,8
1,3
2,4
9,15
14
HMC1022
S/R
8
0.1μF
+
SET Pulse
Read Vset
RESET Pulse
Read Vrst
OS = (Vset+Vrst)/2
Vout = Vrst - OS
Timer
expired
Read Vrst
y
n
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