LM1204.PDF

December 1994

LM1204 150 MHz RGB Video Amplifier System

General Description

The LM1204 is a triple 150 MHz video amplifier system

designed specifically for high resolution RGB video display

applications. In addition to three matched video amplifiers,

the LM1204 contains a DC operated contrast control, a DC

operated drive control for each amplifier, and a dual clamp-

ing system for both brightness control and video blanking.

The LM1204 also contains a back porch clamp pulse gener-

ator which is activated by an externally supplied g H/HV

sync signal or by an external composite video signal. The

g H/HV sync input will have priority over the composite vid-

eo input. A single b H/HV sync output is provided for the

automatically selected sync input signal. The back porch

clamp pulse width is user adjustable from 0.3 m sto4 m s.

The LM1204 video output stage will directly drive most

Hybrid or discrete CRT amplfier input stages without the

need for an external buffer transistor. The device has been

designed to operate from a 12V supply with all DC controls

operating over a 0V to 4V range providing for an easy inter-

face to serial digital buss controlled monitors.

Features

Y Built-in video blanking function

Y Built-in sync separator for composite video input

Y Includes DC restoration of video signals

Y Back porch clamp pulse width user adjustable

Y DC control of brightness, contrast, blanking level, drive

and cutoff

Y DC controls are 0V to 4V for easy interfacing to a

digitally controlled system

Key Specifications

Y 150 MHz large signal bandwidth (typ)

Y 2.3 ns rise/fall times (typ)

Y 0.1 dB contrast tracking (typ)

Y g 3 dB drive ( D gain) adjustments on R, G, B channels

(typ)

Applications

Y High resolution CRT monitors

Y Video AGC amplifier

Y Wideband amplifier with gain and DC offset control

Block Diagram and Connection Diagram

Top View

TL/H/11238±1

Ordering Information

Order Number LM1204V

See NS Package Number V44A

C 1995 National Semiconductor Corporation

TL/H/11238

RRD-B30M115/Printed in U. S. A.

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales

Office/Distributors for availability and specifications.

Supply Voltage, V CC

Pins 2, 4, 6, 19, 31, 41, 44 (Note 3)

Thermal Resistance, i JA

52 § C/W

Junction Temperature, T J

150 § C

ESD Susceptibility (Note 4)

2.5 kV

13.5V

Storage Temperature

b 65 § Cto150 § C

Lead Temperature

Vapor Phase (60 seconds)

Peak Video Output Source Current

(Any One Amplifier) Pins 30, 35 or 39

30 mA

215 § C

Infrared (15 seconds)

220 § C

Voltage at Any Input Pin, V IN

GND s V IN s V CC

Maximum g H Sync Input Voltage

5.5 V PP

Operating Ratings (Note 2)

Temperature Range

Power Dissipation, PD (Above 25 § C

Derate Based on i JA and T J )

0 § Cto70 § C

2.4W

Supply Voltage, V CC

10.8V s V CC s 13.2V

DC Electrical Characteristics (Video Amplifier Section)

The following specifications apply for V CC (pins 2, 4, 6, 19, 31, 36, 41 and 44) e 12V and T A e 25 § C unless otherwise specified.

S1 e B, S2 e B, S3, 4, 5 closed, V9, 13, 15 e 2V, V20, 21, 22, 24, 43 e 0.5V unless otherwise specified; see test circuit,

Figure1.

Symbol

Parameter

Conditions

Typical

Limit

Units

(Note 5)

(Note 6)

I S

Supply Current

No Video or Sync Input

100

125

Signals, S1 e A

(Max)

I B

Input Bias Current

S1 e A

0.3

m A

(Pin 9, 13, 15, 20, 21 or 22)

(Max)

I 24h

Blank Gate Input High Current

V24 e 4V

0.01

m A

(Max)

I 24l

Blank Gate Input Low Current

V24 e 0V

m A

(Max)

I FB

Feedback Input Current

150

(Pin 28, 33 or 38)

I Blank a Blank Cap Charge Current

V 32,37,42 e 0V

185

m A (Min)

I Blank b Blank Cap Discharge Current

V 32,37,42 e 5V

b 185 b 75

m A (Min)

I BB

Blank Cap Bias Current (Pins 32, 37, 42)

I Clamp a

Clamp Cap Charge Current

V 5,10,14 e 0V

185

m A (Min)

I Clamp b

Blank Cap Discharge Current

V 5,10,14 e 5V

b 185 b 75

m A (Min)

I CB

Clamp Cap Bias Current (Pins 5, 10, 14)

V 24h Blank Gate High Input Voltage

Input Signal is Not Blanked

V (Min)

V 24l

Blank Gate Low Input Voltage

Input Signal is Blanked

0.8

V (Max)

Blank Comparator Offset Voltage

Voltage between V43 and

Any One Video Output

(Max)

V H

Video Output High Voltage

R L e 350 X

8.7

V(Min)

(Pins 30, 35, 40)

V28, 33, 38 e 0V

V L

Video Output Low Voltage

R L e 350 X

0.1

0.5

V(Max)

(Pins 30, 35, 40)

V28, 33, 38 e 4V

V CM43 Common Mode Range of Blank

0.5

V(Min)

Comparator (Pins 43, 28, 33, 38)

V(Max)

DC Electrical Characteristics (Sync Separator/Processor Section)

The following specifications apply for V CC (Pins 2, 4, 6, 19, 31, 36, 41 and 44) e 12V and T A e 25 § C, unless otherwise

specified. S1 e B, S2 e B, S3, 4, 5 closed, V9, 13, 15 e 2V, V20, 21, 22, 24, 43 e 0.5V, unless otherwise specified; see Test

Circuit Figure1.

Symbol

Parameter

Conditions

Typical

Limit

Units

(Note 5)

(Note 6)

b HV OH b H Sync Output Logic High (Pin 26)

4.2

2.4

V(Min)

b HV OL b H Sync Output Logic Low (Pin 26)

0.1

0.4

V(Max)

V 23

Quiescent DC Voltage at g H

Sync Input

AC Electrical Characteristics (Video Amplifier Section)

The following specifications apply for V CC (Pins 2, 4, 6, 19, 31, 36, 41 and 44) e 12V and T A e 25 § C, unless otherwise

specified. S1 e B, S2 e B, S3, 4, 5 closed, V9, 13, 15, 21, 24, 43 e 4V, V20 e 2V, unless otherwise specified; see Test Circuit

Figure1.

Symbol

Parameter

Conditions

Typical Limit

Units

(Note 5)

(Note 6)

R IN

Video Amplifier Input Resistance

k X

A Vmax

Maximum Video Amplifier Gain

f IN e 12 kHz

5.5 V/V(Min)

D A Vtrack

Amplifier Gain (Contrast)

0.1

Tracking (Note 7)

D A V2V

Attenuation at 2V

Ref: A V max

V21 e 2V

D A V0.5V

Attenuation at 0.5V

Ref: A V max

V21 e 0.5V

dB(Min)

D Gain

D Gain Range (Pins 9, 13, 15)

V9, 13, 15 e 0V to 4V

g 3

D V O

Max Brightness Tracking Error (Note 8)

100

f b 3dB

Video Amplifier Bandwidth (Note 9)

V OUT e 3.5 V PP

150

MHz

THD

Video Amplifier Distortion

V OUT e 1V PP ,f e 12 kHz

0.3

t R

Video Output Rise Time (Note 9)

Square Wave Input

2.0

V OUT e 3.5 V PP ,R L e 350 X

t F

Video Output Fall Time (Note 9)

Square Wave Input

2.3

V OUT e 3.5 V PP ,R L e 350 X

V ISO (1 MHz) Video Amplifier 1 MHz

b 50

Isolation (Notes 9, 10)

V ISO (130 MHz) Video Amplifier 130 MHz

b 10

Isolation (Notes 9, 10)

AC Electrical Characteristics (Sync Separator/Processor Section)

The following specifications apply for V CC (Pins 2, 4, 6, 19, 31, 36, 41 and 44) e 12V and T A e 25 § C, unless otherwise

specified. S1 e A, S2 e B, S3, 4, 5 closed, V9, 13, 15, 20, 21, 43 e 2V, unless otherwise specified; see Test Circuit Figure1

and Timing Diagram for input waveform.

Symbol

Parameter

Conditions

Typical

Limit

Units

(Note 5)

(Note 6)

V 18(Min)

Composite Video Input Voltage

S2 e A, Input e 10% Duty

0.15

V PP

(Pin 18)

Cycle, Test for Loss of BP

(Min)

V 18(Max) Composite Video Input Voltage

Pulse at Pin 26

V PP

(Pin 18)

(Max)

V 23

g H Sync Input Voltage (Pin 23)

Input e 10% Duty Cycle

1.6

V PP

(Min)

Back Porch Clamp Pulse Width

S2 e A, Pin 26 e BP Output

1.4

m s

at V 24 e 1V

(Max)

Back Porch Clamp Pulse Width

300

600

at V 24 e 4V

(Max)

Maximum g H Sync Input Frequency

600

KHz

D HI

Max Duty Cycle of Active High

Test for Loss of Sync

H Sync (Pin 23)

at Pin 26

D LO

Max Duty Cycle of Active Low

H Sync (Pin 23)

t pdl1

g H Sync Input to b H Sync

Input e 10% Duty Cycle

100

Output Low Delay

t pdh1

g H Sync Input to b H Sync

Input e 10% Duty Cycle

Output High Delay

t pd1

g H Sync Input Trailing Edge to

Input e 10% Duty Cycle,

Back Porch Clamp Output Delay

S2 e A

t pdl2

Composite Video Input to b H

Input e 10% Duty Cycle

106

Sync Output Low Delay

t pdh2

Composite Video Input to b H

Input e 10% Duty Cycle

Sync Output High Delay

t pd2

Composite Video Input Trailing

Input e 10% Duty Cycle

Edge to Back Porch Clamp Output Delay S2 e A

t pdl2 ±t pdl1 Composite Video and g H Sync Input

Input e 10% Duty Cycle

to b H Sync Output Delta Delay

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.

Note 2: Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications

and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics

may degrade when the device is not operated under the listed test conditions.

Note 3: V CC supply pins 2, 4, 6, 19, 31, 36, 41 and 44 must be externally wired together to prevent internal damage during V CC power on/off cycle.

Note 4: Human body model, 100 pF discharged through a 1.5 k X resistor.

Note 5: Typical specifications are specified at a 25 § C and represent the most likely parametric norm.

Note 6: Tested limits are guaranteed to National's AOQL (Average Outgoing Quality Level).

Note 7: D AV tracking is a measure of the ability of any two amplifiers to track each other and quantifies the matching of the three attenuators. It is the difference in

gain change between any two amplifiers with the contrast voltage, V21, at either 4V or 2V measured relative to an A V max condition V21 e 4V. For example, at A V

max, the three amplifier gains might be 17.4 dB, 16.9 dB and 16.4 dB and change to 7.3 dB, 6.9 dB and 6.5 dB respectively for V21 e 2V. This yields the measured

typical g 0.1 dB channel tracking.

Note 8: Brightness tracking error is measured with all three video channels set for equal gain. The measured value is limited by the resolution of the measurement

equipment.

Note 9: When measuring video amplifier bandwidth or pulse rise and fall times, a double sided full ground plane printed circuit board is recommended. Video

amplifier isolation tests also require this printed circuit board. The measured rise and fall times are effective rise and fall times, taking into account the rise and fall

times of the generator.

Note 10: Measure output levels of either undriven amplifier relative to the driven amplifier to determine channel isolation. Terminate the undriven amplifier inputs.

Typical Performance Characteristics V CC e 12V, T A e 25 § C unless otherwise specified

Attenuation vs Contrast

Attenuation vs Drive

Back Porch Clamp Pulse

Control Voltage ( f e 12 kHz)

Width vs Pin 22 Voltage

Minimum External g H

Sync Input Level (V PP )

Contrast vs Frequency

Drive Control vs Frequency

Crosstalk vs Frequency

TL/H/11238±2

vs Input Duty Cycle (%)

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