Page 1
Order this document by MC13280A Y/D
The MC13280A Y and MC13281A/B are three channel wideband amplifiers
designed for use as a video pre–amplifier in high resolution RGB color
monitors.
Features:
• 4.0 Vpp Output Swing
• 3.5 ns Rise/Fall Time, 100 MHz Bandwidth (MC13281A/B)
• 4.3 ns Rise/Fall Time, 80 MHz Bandwidth (MC13280AY)
• Subcontrast Controls for Each Channel
• Main Contrast Control
• Blanking and Clamping Inputs
• Packages: NDIP–24 and NDIP–20
• A Single PC Board Pattern Can Accept the MC13281A and the
MC13282A (Video Amplifier with OSD)
ORDERING INFORMATION
Operating
Device
MC13280A YP Plastic DIP
MC13281AP
MC13281BP Plastic DIP
ABSOLUTE MAXIMUM RATINGS
Rating
Power Supply Voltage V
Voltage at Video Amplifier Inputs 2, 4, 6 –0.5, +5.0 Vdc
Collector–Emitter Current (Three Channels) Video V
Storage Temperature – –65 to +150 °C
Junction Temperature – 150 °C
NOTES: 1.Devices should not be operated at these limits. Refer to “Recommended
Operating Conditions” section for actual device operation.
2.ESD data available upon request.
Temperature Range
TA = 0° to +70°C
Video V
Package
Plastic DIP
Pin Value Unit
CC
CC
CC
–0.5, 10
–0.5, 10
120 mA
Vdc
80/100 MHz VIDEO
PROCESSOR
24
1
20
1
PIN CONNECTIONS
R Subcontrast
G Subcontrast
B Subcontrast
R Subcontrast
G Subcontrast
B Subcontrast
Contrast
124
R Input
2
3
G Input
4
5
B Input
6
Gnd
7
8
N/C
V
9
CC
10
N/C
11
N/C
12
N/C
(Top View)
120
R Input
2
3
4
G Input
5
6
B Input
7
Gnd
8
V
CC
9
10Fast Commutate
(Top View)
P SUFFIX
PLASTIC PACKAGE
CASE 724
P SUFFIX
PLASTIC PACKAGE
CASE 738
Blank
23
Clamp
22
R Emitter
R Clamp
21
V5
20
G Emitter
19
G Clamp
18
MC13281A
Video V
17
16
15
14
13
19
18
17
16
15
MC13281B
14
MC13280AY
13
12
11
CC
B Clamp
B Emitter
Fast Commutate
Contrast
Blank
Clamp
R Emitter
R Clamp
V5
G Emitter
G Clamp
Video V
CC
B Clamp
B Emitter
This document contains information on a new product. Specifications and information herein
are subject to change without notice.
MOTOROLA ANALOG IC DEVICE DATA
Motorola, Inc. 1996 Rev 0
1
Page 2
MC13280AY MC13281A/B
V1, V3, V5
V
Emitt
RECOMMENDED OPERATING CONDITIONS
Characteristic Pin Min Typ Max Unit
Power Supply Voltage VCC,
Contrast Control Contrast 0 – 5.0 Vdc
Subcontrast Control 1, 3, 5 0 – 5.0 Vdc
Blanking Input Signal Amplitude Blank 0 – 5.0 V
Clamping Input Signal Amplitude Clamp 0 – 5.0 V
Video Signal Amplitude
(with 75 Ω Termination)
Collector–Emitter Current (Total for Three
Channels)
Clamp Pulse Width Clamp 500 – – ns
Operating Ambient Temperature – 0 – 70 °C
Video V
2, 4, 6 – 0.7 1.0 Vpp
Video V
7.6 8.0 8.4 Vdc
CC
CC
0 – 50 mA
ELECTRICAL CHARACTERISTICS (Refer to Test Circuit Figure 1, T
Characteristic Condition Pin Min Typ Max Unit
Input Impedance
Internal DC Bias Voltage
Output Signal Amplitude
Voltage Gain
Contrast Control Contrast = 5.0 to 0 V
Subcontrast Control V1, V3, V5 = 5.0 to 0 V
Emitter DC Level – – 1.0 1.2 1.4 Vdc
Blanking Input Threshold – Blank – 1.25 – V
Clamping Input Threshold – Clamp – 3.75 – V
Video Rise Time
MC13280A Y
MC13281A/B
Video Fall Time
MC13280A Y
MC13281A/B
Video Bandwidth
MC13280A Y
MC13281A/B
Power Supply Current VCC, Video VCC = 8.0 V – – 70 – mA
NOTE: It is recommended to use a double sided PCB layout for high frequency measurement (e.g., rise/fall time, bandwidth).
V2, V4, V6 = 0.7 Vpp
V1, V3, V5 = 5.0 V
V2, V4, V6 = 0.7 Vpp
RL > 300 Ω, CL < 5.0 pF
V2, V4, V6 = 0.7 Vpp
RL > 300 Ω, CL < 5.0 pF
V2, V4, V6 = 0.7 Vpp
V1, V3, V5, Contrast = 5.0 V
RL > 300 Ω, CL < 5.0 pF
– 2, 4, 6
= 4.0 Vpp
out
= 4.0 Vpp
out
= 5.0
Contrast = 5.0 V
Contrast = 5.0 V
V
V
= 25°C, VCC = 8.0 Vdc.)
A
100 – – kΩ
– 2.4 – Vdc
R, G, B
ers
Contrast – –26 – dB
1, 3, 5 – –26 – dB
R, G, B
Emitters
R, G, B
Emitters –
R, G, B
Emitters –
3.6 4.0 – Vpp
– 5.6 – V/V
–
–
–
–
4.3
3.5
4.3
3.5
80
100
–
–
–
–
–
–
ns
ns
MHz
2
MOTOROLA ANALOG IC DEVICE DATA
Page 3
MC13280AY MC13281A/B
Figure 1. Internal Block Diagram
Fast Commutate
R Input
R Subcontrast
Contrast
G Input
V
ref1
Contrast and Subcontrast
Control Processor
V
ref1
R Channel
V
V
ref2
ref2
R Clamp
Video V
CC
R Emitter
G Clamp
G Emitter
G Subcontrast
B Input
B Subcontrast
Contrast and Subcontrast
Control Processor
V
ref1
Contrast and Subcontrast
Control Processor
This device contains 272 active transistors.
Clamp Blank
Decoder
G Channel
B Channel
V
ref2
Blank
Clamp
B Clamp
B Emitter
V
CC
V5
Gnd
MOTOROLA ANALOG IC DEVICE DATA
3
Page 4
MC13280AY
5.0 V
R
330
Contrast
The dc current through the output
MC13281B
Pin
1 1 R
3 3 G
5 5 B
2 2 R Input
4 4 G Input
6 6 B Input
MC13281A
Pin
MC13280AY MC13281A/B
PIN FUNCTION DESCRIPTION
Name Equivalent Internal Circuit Description
Subcontrast
Control
Subcontrast
Control
Subcontrast
Control
75
0.1
5.0 V
Ω
Clamp
V
CC
V
5.0 V
50 k
ref
1.0 k10 k
These pins provides a maximum of
26 dB attenuation to vary the gain of
each video amplifier separately.
Input voltage is from 0 to 5.0 V .
Increasing the voltage will increase
the contrast level.
The input coupling capacitor is used
for input clamping storage. The
maximum source impedance is 100 Ω.
Input polarity of the video signal is
positive.
Nominal 0.7 Vpp input signal is
recommended (maximum 1.0 Vpp).
7 7 Ground Ground pin. Connect to a clean, solid
N/A 8 N/C
10 N/C
11 N/C
12 N/C
8 9 V
9 13 Contrast
10 14 Fast
11 15 B Emitter
15 19 G Emitter
18 22 R Emitter
CC
Commutate
Output
Output
Output
5.0 V
Video
Signal
42 k
2.5 V
2.0 k
V
CC
=
E
Typical
ground.
Connected to ground.
Connect to 8.0 Vdc supply, ±5%.
Decoupling is required at this pin.
Overall Contrast Control for the three
channels.
The input range is 0 V to 5.0 V. An
increase of voltage increases the
contrast.
Must be connected to ground.
The video outputs are configured as
emitter–followers with a driving
capability of about 15 mA each.
The dc voltage at these three emitters
is set to 1.2 V (black level).
The dc current through the output
stage is determined by the emitter
resistors (typically 330 Ω).
4
MOTOROLA ANALOG IC DEVICE DATA
Page 5
MC13280AY
p
Video Out
The capacitor is used for video output
MC13281B
Pin
12 16 B Clamp
14 18 G Clamp
MC13281A
Pin
Capacitor
Capacitor
MC13280AY MC13281A/B
PIN FUNCTION DESCRIPTION (continued)
1.2 V
V
CC
DescriptionEquivalent Internal CircuitName
A 100 nF capacitor is connected to
each of these pins.
The ca
acitor is used for video output
dc restoration.
17 21 R Clamp
13 17 Video V
16 20 5.0 V
19 23 Clamp
Capacitor
ref
CC
(V5)
5.0 V
10
Connect to 8.0 V dc supply, ±5%. The
VCC is for the video output stage. It is
internally connected to the collectors
of the output transistors.
V
CC
Band Gap
Regulator
V
0.8 RR
ref1
30 k
µ
F
V
CC
V
ref2
10 k
5.0 V regulator. Minimum 10 µF
capacitor is required for noise filtering
and compensation. It can source up
to 20 mA but not sink current. Output
impedance is ≈ 10 Ω. Recommended
for use as a voltage reference only.
This pin is used for video clamping.
The threshold clamping level is 3.75 V .
3.75 V
20 24 Blank
MOTOROLA ANALOG IC DEVICE DATA
V
ref2
10 k
V
V
CC
ref1
30 k
This pin is used for video blanking.
The threshold blanking level is 1.25 V .
1.25 V
5
Page 6
MC13280AY MC13281A/B
FUNCTIONAL DESCRIPTION
The MC13280AY and MC13281A/B are composed of
three video amplifiers, clamping and blanking circuitry with
contrast and subcontrast controls. Each video amplifier is
designed to have a –3.0 dB bandwidth of 100 MHz
(MC13281, 80 MHz for the MC13280) with a gain of up to
about 5.6 V/V, or 15 dB.
Video Input
The video input stages are high impedance and designed
to accept a maximum signal of 1.0 Vpp with 75 Ω termination
(typically) provided externally. During the clamping period, a
current is provided to the input capacitor by the clamping
circuit which brings the input to a proper dc level (nominal
2.0 V). The blanking and clamping signals are to be provided
externally, with their thresholds at 1.25 V and 3.75 V,
respectively.
Video Output
The video output stages are configured as emitter–
followers, with a driving capability of about 15 mA for each
channel. The dc voltage at these three emitters is set to 1.2 V
(black level). The dc current through each output stage is
determined by the emitter resistor (typically 330 Ω).
Figure 2. T est Circuit
R Input
G Input
B Input
R175R275R3
75
C1
0.1
C2
0.1
C3
0.1
Blank
Input
Blank Clamp Fast
R Input
G Input
B Input
Clamp
Input
Contrast Control
The contrast control varies the gain of three video
amplifiers from a minimum of 0.3 V/V to a maximum of
5.6 V/V when all subcontrast levels are set to 5.0 V.
Subcontrast Control
Each subcontrast control provides a maximum of 26 dB
attenuation on each video amplifier separately.
Clamp Pulse Input
The clamping pulse is provided externally, and the pulse
width must be no less than 500 ns.
Blank Pulse Input
The blanking pulse is used to blank the video signal during
the horizontal sync period, or used as a control pin for video
mute function.
Fast Commutate
This pin should be connected to ground.
Power Supplies
VCC and Video VCC supplies are to be 8.0 V ±5%.
8.0 V
C14
µ
F
47
Commutate
MC13280AY
MC13281A/B
Video
V
CC
V
CC
R Emitter
G Emitter
B Emitter
R Clamp
R4
330R5330R6330
C15
0.1
R Output
G Output
B Output
G Clamp
Gnd
V5
C4
0.1
C5
10
Subcontrast Control
G
µ
F
C6
0.1
5.0 V 5.0 V 5.0 V 5.0 V
C7
0.1
B
C8
0.1
6
B Clamp
C11
0.1
Clamp Capacitor
ContrastR
C10
0.1
MOTOROLA ANALOG IC DEVICE DATA
C12
0.1
C13
0.1
Page 7
MC13280AY MC13281A/B
APPLICATION INFORMATION
PCB Layout
Care should be taken in the PCB layout to minimize the
noise effects. The most sensitive pins are VCC, Video VCC,
V5 and Clamp. It is strongly recommended to make a ground
plane and connect VCC/Video VCC and ground traces, to the
power supply directly. Separate power supply traces should
be used for VCC and Video VCC and decoupling capacitors
should be connected as close as possible to the device.
Multi–layer ceramic and tantalum capacitors are
recommended. V5 is designed as a 5.0 V voltage reference
for contrast, and RGB subcontrast controls, so the same
precautions for VCC should also be applied at this pin. The
Clamp capacitors should be connected to ground close to
IC’s ground pin, or power supply ground. The copper trace of
video signal inputs and outputs should be as short as
possible and separated by ground traces to avoid any RGB
cross–interference. A double sided PCB should be used to
optimize the device’s performance.
RGB Input and Output
The RGB output stages are designed as emitter–followers
to drive the CRT driver circuitry directly . The emitter resistors
used are 330 Ω (typically) and the driving current is 15 mA
maximum for each channel. The loading impedance
connected to the output stages should be greater than 330 Ω
and less than 5.0 pF for optimum performance (e.g., rise/fall
time, bandwidth, etc.). Decreasing the resistive load will
reduce the rise/fall time by increasing the driving current, but
the output stage may be damaged due to increasing power
dissipation at the same time. The frequency response is
affected by the loading capacitance. The typical value is 3.0
to 5.0 pF. Figure 3 shows a typical interface with a video
output driver. For high resolution color monitor application, it
is recommended to use coaxial cable or shielded cable for
input signal connections.
Clamp and Blank Input
The clamp input is normally (except for Sync–on–Green)
connected to a positive horizontal sync pulse and has a
threshold level of 3.75 V. It is used as a timing reference for
the dc restoration process, so it cannot be an open circuit. If
Sync–on–Green timing mode is used, the clamping pulse
should be located at the horizontal back porch period instead
of horizontal sync. Otherwise, the black level will be clamped
at the wrong dc level.
The blank input is used as a video mute, or horizontal
blanking control pin, and is normally connected to a blanking
pulse generated from the flyback or MCU. The threshold level
is 1.25 V. The blanking pulse width should be equal to the
flyback retrace period to make sure that the video signal is
blanked properly during retrace. It is necessary to limit the
amplitude and avoid any negative undershoot if the flyback
pulse is used. The blanking input pin cannot accept a
negative voltage. This pin should be grounded if it is not used.
MOTOROLA ANALOG IC DEVICE DATA
7
Page 8
MC13280AY MC13281A/B
Figure 3. Interfacing with Video Output Drivers
Reference Voltage
VR1
50 k
VR2
50 k
VR3
50 k
5.0 V
C11
10
C10
0.1
CRT Driver V
8.0 V
C12
R4
µ
F
µ
F
47
10
C9
0.1
CC
C7
47
C
L
µ
FC30.1
R Input
G Input
B Input
R175R275R3
75
C1 0.1
C2 0.1
C3 0.1
Clamp
Input
Blank
Input
R
Contrast
R Input
G Input
B Input
Clamp
Blank
G
Contrast
V5
B
Contrast
MC13280AY
MC13281A/B
Video Processor
Fast
Commutate
Gnd
Contrast
V
CC
5.0 V
Video
V
CC
R Emitter
G Emitter
B Emitter
R Clamp
G Clamp
B Clamp
VR5
50 k
C4
0.1
C5
0.1
R5
330
R6
330
R7
330
RGB Output
C6
0.1
8
MOTOROLA ANALOG IC DEVICE DATA
Page 9
MC13280AY MC13281A/B
4.5
4.0
3.5
3.0
2.5
2.0
1.5
VIDEO OUTPUT (Vpp)
1.0
0.5
4.5
4.0
3.5
3.0
2.5
2.0
1.5
VIDEO OUTPUT (Vpp)
1.0
0.5
Figure 4. RGB In/Out Linearity
4.5
4.0
3.5
3.0
2.5
2.0
1.5
VIDEO OUTPUT (Vpp)
1.0
0.5
0
0
0.2 4.0
0.4 0.6 6.0
VIDEO INPUT (Vpp)
0.8
0
0
Figure 5. Contrast Control
2.0
CONTRAST CONTROL VOLTAGE (V)
Figure 7. Crosstalk From Green to Red
Figure 6. Subcontrast Control
0
–10
–20
–30
–40
–50
ATTENUATION (dB)
–60
–70
–800
0
2.0
SUBCONTRAST VOLTAGE (V)
1.0
and Blue Channels
Blue Channel
Red Channel
104.0
f, FREQUENCY (MHz)
1006.0
1000
MOTOROLA ANALOG IC DEVICE DATA
9
Page 10
MC13280AY MC13281A/B
Figure 8. Rise Time for MC13281B Figure 9. Fall Time for MC13281B
100 mV/DIV
5.0 ns/DIV
10x PROBE
NOTE: Recommend to use a double sided PCB without any socket for rise/fall time measurements, using an input pulse with
1.5 ns rise/fall time and an active probe with 1.7 pF capacitance loading.
Figure 10. Single Sided PCB Layout
(Component Side) for MC13280AY, MC13281B
Blank Clamp
R In
C12
R7
C13
C4
R5
C17
C11
R6
C5
C16
R4
R Out
G Out
B Out
G In
B In
R VR1 G VR2 B VR3
R1
J1
C6
C1
C7
C2
R2
C8
C3
C14
C15
R3
C10
J3
IC1
J4
J2
100 mV/DIV
5.0 ns/DIV
10x PROBE
10
V
Gnd
8.0 V
NOTE: J = Jumper
CC
VR5
Main
Contrast
MOTOROLA ANALOG IC DEVICE DATA
Page 11
MC13280AY MC13281A/B
OUTLINE DIMENSIONS
P SUFFIX
PLASTIC PACKAGE
CASE 724–03
ISSUE D
–T–
SEATING
PLANE
–T–
SEATING
PLANE
–A–
24 13
1
E
G
F
–A–
20
1
E
FG
12
D
24 PL
0.25 (0.010) T
11
10
N
D
20 PL
0.25 (0.010) T
N
–B–
B
C
K
M
M
A
P SUFFIX
PLASTIC PACKAGE
CASE 738–03
ISSUE E
C
K
M
M
A
L
NOTE 1
M
24 PLJ
0.25 (0.010) T
L
J
20 PL
0.25 (0.010) T
NOTES:
1. CHAMFERED CONTOUR OPTIONAL.
2. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
3. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
4. CONTROLLING DIMENSION: INCH.
DIM MIN MAX MIN MAX
A 1.230 1.265 31.25 32.13
B 0.250 0.270 6.35 6.85
C 0.145 0.175 3.69 4.44
D 0.015 0.020 0.38 0.51
E 0.050 BSC 1.27 BSC
F 0.040 0.060 1.02 1.52
G 0.100 BSC 2.54 BSC
J 0.007 0.012 0.18 0.30
M
M
B
M
M
B
K 0.110 0.140 2.80 3.55
L 0.300 BSC 7.62 BSC
M 0 15 0 15
____
N 0.020 0.040 0.51 1.01
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD
FLASH.
DIM MIN MAX MIN MAX
A 25.66 27.171.010 1.070
B 6.10 6.600.240 0.260
C 3.81 4.570.150 0.180
D 0.39 0.550.015 0.022
E
F
G 2.54 BSC0.100 BSC
J 0.21 0.380.008 0.015
K 2.80 3.550.110 0.140
L 7.62 BSC0.300 BSC
M
M 0 15 0 15
N 0.51 1.010.020 0.040
MILLIMETERSINCHES
MILLIMETERSINCHES
1.27 BSC0.050 BSC
1.27 1.770.050 0.070
____
MOTOROLA ANALOG IC DEVICE DATA
11
Page 12
MC13280AY MC13281A/B
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty , representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “T ypical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.
How to reach us:
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12
◊
MOTOROLA ANALOG IC DEVICE DATA
MC13280AY/D
*MC13280AY/D*
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