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參數(shù)資料
| 型號(hào)： | IH5151MJE |
| 廠商： | INTERSIL CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Dual SPDT, CMOS Analog Switch |
| 中文描述： | DUAL 1-CHANNEL, SGL POLE DOUBLE THROW SWITCH, CDIP16 |
| 封裝： | CERDIP-16 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 155K |
| 代理商： | IH5151MJE |
6
The circuit in Figure 7 nulls out charge injection effects on
switch pins 1 and 16; a similar circuit would be required on
switch pins 8 and 9.
Simply adjust the pot until V
OUT
= 0mV
P-P
pulse, with
V
ANALOG
= 0V.
If you do not desire to do any adjusting, but wish the least
amount of charge injection possible, then the circuit in Figure
8 should be used.
This configuration will produce a typical charge injection of
V
OUT
±
10mV
P-P
into the 1000pF S & H capacitor shown.
Fault Condition Protection
If your system has analog voltage levels which are
independent of the
±
15V (Power Supplies), and these
analog levels can be present when supplies are shut off, you
should add fault protection diodes as shown in Figure 9.
If the analog input levels are below
±
15V, the PN junctions of
Q
13
and Q
15
are reversed biased. However if the
±
15V
supplies are shut off and analog levels are still present, the
configuration becomes as shown in Figure 10.
The need for the diodes in this circumstance is shown in
Figure 11. If ANALOG INPUT is greater than 1V, then the PN
junction of Q
15
is forward biased and excessive current will
be drawn. The addition of 1N914 diodes prevents the fault
currents from destroying the switch. A similar event would
occur if ANALOG INPUT was less than or equal to -1V,
wherein Q
13
would become forward biased. The 1N914
diodes form a “back to back” diode arrangement with Q
13
and Q
15
bodies.
This structure provides a degree of overvoltage protection
when supplies are on normally, and analog input level
exceeds supplies.
This circuit will switch up to about
±
8V ANALOG
overvoltages. Beyond this drain (N) to body (P) breakdown
VOLTAGE of Q
13
limits overvoltage protection.
1000pF S&H
CAPACITOR
+5V
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
0V
3V
TTL
STROBE
+15V
-15V
10
k
27pF
39k
FIGURE 8. NO-ADJUST CHARGE INJECTION
COMPENSATION CIRCUIT
FIGURE 9. ADDING DIODES PROTECTS SWITCH
FIGURE 10. SWITCH WITHOUT PROTECTION DIODES
FIGURE 11. FAULT CONDITION WITHOUT PROTECTION
DIODES
FIGURE 12. FAULT CONDITION WITH PROTECTION DIODES
+5V
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
-15V
1N914
1N914+15V
5
+15
FROM DRIVER
Q
13
Q
15
P
P
N
OUTPUT SWITCH PAIR
P
N
N
FROM DRIVER
-15V
16
1
ANALOG INPUT
1
0V WHEN +15V SUPPLY
SHUT OFF
Q
13
Q
15
P
P
N
P
N
N
16
ANALOG INPUT
SAY -10V
TO +10V
0V WHEN -15V IS
SHUT OFF
16
+15V
Q
13
Q
15
P
N
1N914
P
N
P
N
1
OVERVOLTAGE
ANALOG INPUT
-15V
1N914
IH5151
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