MC13081X
PIN FUNCTION DESCRIPTION (continued)
Equivalent Internal Circuit
Pin
Name
5.0 V
Regulator
Output
Description
9
5.0 V (±5%) regulator. Minimum 10 µF capacitor is
required for noise filtering and compensation. Up to
20 mA can be supplied to external circuitry. It can
source but not sink current. Output impedance is
≈ 10 Ω.
V
CC
Band Gap
Regulator
9
5.0 V
10 µF
This 5.0 V regulator is recommended for use as a
reference only.
R
0.8 R
10
Phase
Detector 1
Filter
External components at this pin will determine the
PLL gain and phase characteristics. The capacitors
should be non–polarized.
400
400
µ
A
C10A
10
Phase
Detector #1
5.0 V
The voltage at this pin nominally ranges from 1.5 V to
5.0 V with corresponding horizontal frequency from
25 kHz to 68 kHz.
µ
A
R10 C10B
Horiz
OSC
Sync
11
12
Automatic
Frequency
Control
Pin 11 is a buffered equivalent of Pin 10, and ranges
from a minimum of 1.5 V at horizontal high frequency
to near 5.0 V at low frequency. Pin 11 can sink a
maximum of 1.0 mA, but cannot source current.
11
From
Pin 10
V
CC
R11A
R11B
64x
Oscillator
5.0 V
Horizontal
Frequency
Range
The current out of Pin 12 determines the horizontal
frequency by a current transfer constant of
≈ 122 Hz/µA.
12
R11C
Pin 12 is internally maintained at 5.0 V.
13
Timebase
Ground
Ground for the timebase section. Connect to a clean,
low impedance ground.
14, 16
FH Switch A, B
Pin 14 (Switch A), and Pin 16 (Switch B) are open
collector NPN switches to ground. Each switch is
“on” when the horizontal frequency is higher than the
set points set by resistors at Pins 15 and 17,
respectively.
14
16
Maximum voltage is 8.0 V, and maximum sink
current is 20 mA.
V
15, 17
FH Switch A, B
Threshold
Setting
Pin 15 and Pin 17 are current mirror at 1/2 of Pin 12
current. External resistors at these pins set the
horizontal frequency at which Pins 14 and 16 will
switch, respectively. The threshold voltage is 5.0 V.
CC
I12
2
1.0 k
15,17
To Output
Switches
3.0 k
R15
(R17)
5.0 V
V
18
19
Contrast
Control
The input control range is from 0 to 5.0 V. An increase
of voltage increases contrast.
CC
50 k
5.0 V
18,19
R18
(R19)
Brightness
Control
The input control range is from 0 to 5.0 V. An increase
of voltage increases brightness.
7
MOTOROLA ANALOG IC DEVICE DATA