LH0032C 查看數據表（PDF） - Calogic, LLC
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LH0032C Datasheet PDF : 9 Pages
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LH0032 / LH0032C
LLC
TYPICAL APPLICATIONS (Continued)
High Speed Current Mode MUX
R1
A1
5.1k
R2
A2
5.1k
R3
A3
5.1k
R4
A4
5.1k
2
AM9710
G1
63
1
G2
95
7
G3
3.8pF
4 5 R5 6
V-
18µF
12
11 5
-
2
3
11
LH0032
6
+
10
V-
13 10 8
G4
12 14
VOUT
APPLICATION INFORMATION:
Power Supply Decoupling
The LH0032, like most high speed circuits, is sensitive to
layout and stray capacitance. Power supplies should be
bypassed as near to pins 10 and 12 as practicable with low
inductance capacitors such as 0.01µF disc ceramics.
Compensation components should also be located close to
the appropriate pins to minimize stray reactances.
Input Current
Because the input devices are FETs, the input bias current
may be expected to double for each 11oC junction
temperature rise. This characteristic is plotted in the typical
performance characteristics graphs. The device will self-heat
due to internal power dissipation after application of power
thus raising the FET junction temperature 40-60oC above
free-air ambient temperature when supplies are ±15V. The
device temperature will stabilize within 5-10 minutes after
application of power, and the input bias currents measured at
that time will be indicative of normal operating currents. An
additional rise would occur as power is delivered to a load due
to additional internal power dissipation.
There is an additional effect on input bias current as the input
voltage is changed. The effect, common to all FETs, is an
avalanche-like increase in gate current as the FET
gate-to-drain voltage is increased above a critical value
depending on FET geometry and doping levels. This effect
will be noted as the input voltage of the LH0032 is taken
below ground potential when the supplies are ±15V. All of the
effects described here may be minimized by operating the
device with VS ≤ ±15V.
These effects are indicated in the typical performance curves.
Input Capacitance
The input capacitance to the LH0032/LH0032C is typically
5pF and thus may form a significant time constant with high
value resistors. For optimum performance, the input
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