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MC13280AY MC13281A/B
Advance Information
80/100 MHz Video Processor
The MC13280AY and MC13281A/B are three channel wideband amplifiers designed for use as a video pre-amplifier in high resolution RGB color monitors. Features:
80/100 MHz VIDEO PROCESSOR
* * * * * * * *
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)
20 1 24 1
P SUFFIX PLASTIC PACKAGE CASE 724
P SUFFIX PLASTIC PACKAGE CASE 738
ORDERING INFORMATION
Device MC13280AYP MC13281AP MC13281BP TA = 0 to +70C Operating Temperature Range Package Plastic DIP Plastic DIP Plastic DIP
PIN CONNECTIONS
R Subcontrast 1 R Input 2 G Subcontrast 3 G Input 4 B Input 6 Gnd 7 N/C 8 VCC 9 N/C 10 MC13281A (Top View) R Subcontrast 1 R Input 2 G Subcontrast 3 G Input 4 B Subcontrast 5 B Input 6 Gnd 7 VCC 8 Contrast 9 Fast Commutate 10 (Top View) MC13280AY MC13281B 20 Blank 19 Clamp 18 R Emitter 17 R Clamp 16 V5 15 G Emitter 14 G Clamp 13 Video VCC 12 B Clamp 11 B Emitter B Subcontrast 5 24 Blank 23 Clamp 22 R Emitter 21 R Clamp 20 V5 19 G Emitter 18 G Clamp 17 Video VCC 16 B Clamp 15 B Emitter 14 Fast Commutate 13 Contrast
ABSOLUTE MAXIMUM RATINGS
Rating Power Supply Voltage Voltage at Video Amplifier Inputs Collector-Emitter Current (Three Channels) Storage Temperature Junction Temperature Pin VCC Video VCC 2, 4, 6 Video VCC - - Value -0.5, 10 -0.5, 10 -0.5, +5.0 120 -65 to +150 150 Unit Vdc Vdc mA C C
N/C 11 N/C 12
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.
This document contains information on a new product. Specifications and information herein are subject to change without notice.
(c) Motorola, Inc. 1996
Rev 0
MOTOROLA ANALOG IC DEVICE DATA
1
MC13280AY MC13281A/B
RECOMMENDED OPERATING CONDITIONS
Characteristic Power Supply Voltage Contrast Control Subcontrast Control Blanking Input Signal Amplitude Clamping Input Signal Amplitude Video Signal Amplitude (with 75 Termination) Collector-Emitter Current (Total for Three Channels) Clamp Pulse Width Operating Ambient Temperature Pin VCC, Video VCC Contrast 1, 3, 5 Blank Clamp 2, 4, 6 Video VCC Clamp - Min 7.6 0 0 0 0 - 0 500 0 Typ 8.0 - - - - 0.7 - - - Max 8.4 5.0 5.0 5.0 5.0 1.0 50 - 70 Unit Vdc Vdc Vdc V V Vpp mA ns C
ELECTRICAL CHARACTERISTICS (Refer to Test Circuit Figure 1, TA = 25C, VCC = 8.0 Vdc.)
Characteristic Input Impedance Internal DC Bias Voltage Output Signal Amplitude Voltage Gain Contrast Control Subcontrast Control Emitter DC Level Blanking Input Threshold Clamping Input Threshold Video Rise Time MC13280AY MC13281A/B Video Fall Time MC13280AY MC13281A/B Video Bandwidth MC13280AY MC13281A/B Power Supply Current
NOTE:
Condition -
Pin 2, 4, 6
Min 100 -
Typ - 2.4 4.0 5.6 -26 -26 1.2 1.25 3.75 4.3 3.5 4.3 3.5 80 100 70
Max - - - - - - 1.4 - - - -
Unit k Vdc Vpp V/V dB dB Vdc V V ns
V2, V4, V6 = 0.7 Vpp V1, V3 V1 V3, V5 = 5 0 V 5.0 Contrast = 5.0 V Contrast = 5.0 to 0 V V1, V3, V5 = 5.0 V V1, V3, V5 = 5.0 to 0 V Contrast = 5.0 V - - - V2, V4, V6 = 0.7 Vpp Vout = 4.0 Vpp RL > 300 , CL < 5.0 pF V2, V4, V6 = 0.7 Vpp Vout = 4.0 Vpp RL > 300 , CL < 5.0 pF V2, V4, V6 = 0.7 Vpp V1, V3, V5, Contrast = 5.0 V RL > 300 , CL < 5.0 pF VCC, Video VCC = 8.0 V
R, G, B Emitters Contrast 1, 3, 5 - Blank Clamp R, G, B Emitters R, G, B Emitters R, G, B Emitters -
3.6 - - - 1.0 - - - - - - - - -
ns - - MHz - - - mA
It is recommended to use a double sided PCB layout for high frequency measurement (e.g., rise/fall time, bandwidth).
2
MOTOROLA ANALOG IC DEVICE DATA
MC13280AY MC13281A/B
Figure 1. Internal Block Diagram
Fast Commutate Vref1 Vref2
R Clamp
Video VCC R Input R Emitter
R Subcontrast
Contrast and Subcontrast Control Processor
R Channel G Clamp
Contrast Vref1 Vref2
G Input G Emitter
Blank Clamp Blank Decoder G Subcontrast Contrast and Subcontrast Control Processor Clamp
G Channel
B Clamp
Vref1
Vref2
B Input B Emitter
VCC B Channel V5 B Subcontrast Contrast and Subcontrast Control Processor Gnd
This device contains 272 active transistors.
MOTOROLA ANALOG IC DEVICE DATA
3
MC13280AY MC13281A/B
PIN FUNCTION DESCRIPTION
MC13280AY MC13281B Pin 1 MC13281A Pin 1
Name R Subcontrast Control G Subcontrast Control B Subcontrast Control R Input
Equivalent Internal Circuit VCC 50 k
Description 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.
3
3
5.0 V
5
5
2
2
Vref 4 4 G Input 0.1 75 6 6 B Input Cl Clamp 5.0 V
The input coupling capacitor is used for input clamping storage. The maximum source impedance is 100 . I t l it f th id i li Input polarity of the video signal is positive. Nominal 0.7 Vpp input signal is recommended (maximum 1.0 Vpp). 1 0 Vpp)
10 k
1.0 10k
7 N/A
7 8 10 11 12
Ground N/C N/C N/C N/C VCC Contrast 5.0 V 42 k 2.0 k 2.5 V
Ground pin. Connect to a clean, solid ground. Connected to ground.
8 9
9 13
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.
10 11
14 15
Fast Commutate B Emitter Output G Emitter Output R Emitter Output Video Signal Contrast RE = 330 Typical VCC
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 ).
15
19
18
22
4
MOTOROLA ANALOG IC DEVICE DATA
MC13280AY MC13281A/B
PIN FUNCTION DESCRIPTION (continued)
MC13280AY MC13281B Pin 12 MC13281A Pin 16
Name B Clamp Capacitor G Clamp Capacitor R Clamp Capacitor Video VCC
Equivalent Internal Circuit
Description A 100 nF capacitor is connected to each of these pins. The capacitor is used for video output dc restoration.
1.2 V Video Out VCC
14
18
17
21
13
17
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. VCC Band Gap Regulator 5.0 V regulator. Minimum 10 F capacitor is required for noise filtering and compensation. It can source up to 20 mA but not sink current. Output impedance is 10 . Recommended for use as a voltage reference only.
16
20
5.0 Vref (V5)
5.0 V 10 F R 0.8 R
19
23
Clamp
VCC Vref2 10 k
Vref1 30 k
This pin is used for video clamping. The threshold clamping level is 3.75 V.
3.75 V
20
24
Blank
VCC Vref2 10 k
Vref1 30 k
This pin is used for video blanking. The threshold blanking level is 1.25 V.
1.25 V
MOTOROLA ANALOG IC DEVICE DATA
5
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 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 ). 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%.
Figure 2. Test Circuit
Blank Input Clamp Input 8.0 V C14 47 F Blank C1 0.1 C2 0.1 C3 0.1 R1 75 R2 75 R3 75 Clamp Fast Commutate Video VCC VCC R Output G Output B Output B Input B Emitter R4 330 MC13280AY MC13281A/B R Clamp G Clamp Gnd V5 Clamp Capacitor R C4 0.1 C5 10 F 5.0 V Subcontrast Control G C6 0.1 5.0 V C7 0.1 5.0 V B C8 0.1 Contrast C10 0.1 5.0 V B Clamp C11 0.1 C12 0.1 R5 330 R6 330 C15 0.1
R Input G Input B Input
R Input G Input
R Emitter G Emitter
C13 0.1
6
MOTOROLA ANALOG IC DEVICE DATA
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 (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 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
MC13280AY MC13281A/B
Figure 3. Interfacing with Video Output Drivers
CRT Driver VCC
Reference Voltage
CL
5.0 V
8.0 V R4 10
C11 C12 10 F 47 F VR1 50 k VR2 50 k VR3 50 k C10 0.1 C9 0.1
C7 47 F
C3 0.1
R G B V5 Contrast Contrast Contrast R Input G Input B Input R1 75 R2 75 R3 75 C1 0.1 R Input C2 0.1 C3 0.1
Gnd
VCC
Video VCC R Emitter G Emitter R5 330 R6 330 R7 330 RGB Output
G Input B Input MC13280AY MC13281A/B Video Processor Clamp Blank Fast Commutate Contrast B Emitter R Clamp G Clamp B Clamp C4 0.1 C5 0.1
C6 0.1
5.0 V Clamp Input Blank Input VR5 50 k
8
MOTOROLA ANALOG IC DEVICE DATA
MC13280AY MC13281A/B
Figure 4. RGB In/Out Linearity
4.5 4.0 VIDEO OUTPUT (Vpp) VIDEO OUTPUT (Vpp) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 0.2 0.4 VIDEO INPUT (Vpp) 0.6 0.8 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 2.0 4.0 6.0
Figure 5. Contrast Control
CONTRAST CONTROL VOLTAGE (V)
Figure 6. Subcontrast Control
4.5 4.0 VIDEO OUTPUT (Vpp) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 2.0 4.0 6.0 ATTENUATION (dB) 0 -10 -20 -30 -40 -50 -60 -70 -80 1.0
Figure 7. Crosstalk From Green to Red and Blue Channels
Blue Channel
Red Channel 10 100 1000
SUBCONTRAST VOLTAGE (V)
f, FREQUENCY (MHz)
MOTOROLA ANALOG IC DEVICE DATA
9
MC13280AY MC13281A/B
Figure 8. Rise Time for MC13281B Figure 9. Fall Time for MC13281B
100 mV/DIV 5.0 ns/DIV 10x PROBE
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 R VR1 R1 G In C6 C1 C7 C2 R2 C8 C3 J1 J3 IC1 G VR2 B VR3 R7 R Out
J4 J2
B In C14 C15 R3 C10
R6 C13 C5 C4 R5 C12 C17 C16 C11 R4
G Out
B Out
Gnd
VCC 8.0 V
VR5 Main Contrast
NOTE:
J = Jumper
10
MOTOROLA ANALOG IC DEVICE DATA
MC13280AY MC13281A/B
OUTLINE DIMENSIONS
P SUFFIX PLASTIC PACKAGE CASE 724-03 ISSUE D
-A-
24 1 13
-B-
12
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.
C -T-
SEATING PLANE
L
K E G F D
24 PL
NOTE 1
N J 0.25 (0.010) TA
24 PL
M
0.25 (0.010)
M M
M
TB
M
DIM A B C D E F G J K L M N
INCHES MIN MAX 1.230 1.265 0.250 0.270 0.145 0.175 0.015 0.020 0.050 BSC 0.040 0.060 0.100 BSC 0.007 0.012 0.110 0.140 0.300 BSC 0_ 15_ 0.020 0.040
MILLIMETERS MIN MAX 31.25 32.13 6.35 6.85 3.69 4.44 0.38 0.51 1.27 BSC 1.02 1.52 2.54 BSC 0.18 0.30 2.80 3.55 7.62 BSC 0_ 15_ 0.51 1.01
P SUFFIX PLASTIC PACKAGE CASE 738-03 ISSUE E -A-
20 11 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. INCHES MIN MAX 1.010 1.070 0.240 0.260 0.150 0.180 0.015 0.022 0.050 BSC 0.050 0.070 0.100 BSC 0.008 0.015 0.110 0.140 0.300 BSC 0_ 15 _ 0.020 0.040 MILLIMETERS MIN MAX 25.66 27.17 6.10 6.60 3.81 4.57 0.39 0.55 1.27 BSC 1.27 1.77 2.54 BSC 0.21 0.38 2.80 3.55 7.62 BSC 0_ 15_ 0.51 1.01
B
1 10
C
L
-T-
SEATING PLANE
K M E G F D
20 PL
N J 0.25 (0.010)
M 20 PL
0.25 (0.010) TA
M
M
TB
M
DIM A B C D E F G J K L M N
MOTOROLA ANALOG IC DEVICE DATA
11
MC13280AY MC13281A/B
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*MC13280AY/D*
MOTOROLA ANALOG ICMC13280AY/D DEVICE DATA

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