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MC14551BFG Datasheet PDF : 10 Pages
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MC14551B
APPLICATIONS INFORMATION
Figure A illustrates use of the on−chip level converter
detailed in Figure 2. The 0−to−5.0 V Digital Control signal is
used to directly control a 9 Vp−p analog signal.
The digital control logic levels are determined by VDD and
VSS. The VDD voltage is the logic high voltage; the VSS
voltage is logic low. For the example, VDD = + 5.0 V = logic
high at the control inputs; VSS = GND = 0 V = logic low.
The maximum analog signal level is determined by VDD
and VEE. The VDD voltage determines the maximum
recommended peak above VSS. The VEE voltage determines
the maximum swing below VSS. For the example, VDD – VSS
= 5.0 V maximum swing above VSS; VSS – VEE = 5.0 V
maximum swing below VSS. The example shows a ± 4.5 V
signal which allows a 1/2 V margin at each peak. If voltage
transients above VDD and/or below VEE are anticipated on the
analog channels, external diodes (Dx) are recommended as
shown in Figure B. These diodes should be small signal types
able to absorb the maximum anticipated current surges during
clipping.
The absolute maximum potential difference between VDD
and VEE is 18 V. Most parameters are specified up to 15 V
which is the recommended maximum difference between
VDD and VEE.
Balanced supplies are not required. However, VSS must be
greater than or equal to VEE. For example, VDD = + 10 V, VSS
= + 5.0 V, and VEE = – 3.0 V is acceptable. See the table below.
+5 V
−5 V
+5 V
EXTERNAL
CMOS
DIGITAL
CIRCUITRY
VDD VSS
VEE
9 Vp−p
ANALOG SIGNAL
0−TO−5 V DIGITAL
CONTROL SIGNAL
SWITCH
I/O
COMMON
O/I
MC14551B
CONTROL
9 Vp−p
ANALOG SIGNAL
+ 4.5 V
GND
− 4.5 V
Figure A. Application Example
VDD
VDD
Dx
SWITCH
I/O
Dx
Dx
COMMON
O/I
Dx
VEE
VEE
Figure B. External Schottky or Germanium Clipping Diodes
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ POSSIBLE SUPPLY CONNECTIONS
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ VDD
In Volts
VSS
In Volts
VEE
In Volts
Control Inputs
Logic High/Logic Low Maximum Analog Signal Range
In Volts
In Volts
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ + 8
0
–8
+ 8/0
+ 8 to – 8 = 16 Vp–p
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ + 5
0
– 12
+ 5/0
+ 5 to – 12 = 17 Vp–p
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ + 5
0
0
+ 5/0
+ 5 to 0 = 5 Vp–p
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ + 5
0
–5
+ 5/0
+ 5 to – 5 = 10 Vp–p
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ + 10
–5
+ 10/ + 5
+ 10 to – 5 = 15 Vp–p
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