SLFS  MARC H   REVISED OCTOBER  POST OFFICE BOX  DALLAS TEXAS  Copyright  Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date
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SLFS MARC H REVISED OCTOBER POST OFFICE BOX DALLAS TEXAS Copyright Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date

Products conform to specifications per the terms of Te xas Instruments standard warranty Production processing does not necessarily include testing of all parameters BW 87223 dB 70 MHz Matched 05dB Attenuators for Contrast Control Three Externall

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SLFS MARC H REVISED OCTOBER POST OFFICE BOX DALLAS TEXAS Copyright Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date




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Presentation on theme: "SLFS MARC H REVISED OCTOBER POST OFFICE BOX DALLAS TEXAS Copyright Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date"— Presentation transcript:


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SLFS048 − MARC H 1990 − REVISED OCTOBER 1991 POST OFFICE BOX 655303 DALLAS, TEXAS 75265 Copyright 1991, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Te xas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. BW (−3 dB) . . . 70 MHz Matched 0.5-dB Attenuators for Contrast Control Three Externally-Gated Comparators for Brightness Control Independent Gain Control of Each Video Amplifier ...A = 4 to 10 Video

Input Voltage Reference Low-Impedance Output Driver ESD Protection Exceeds 2000 V Per MIL Standard 833C, Method 3015 Designed to Be an Improved Replacement for National Semiconductor LM1203 description The LM1203 and LM1203A are wide-band video amplifier systems intended for high-resolution RGB color monitor applications. In addition to three matched video amplifiers, the LM1203 and LM1203A contain three gated differential input black-level clamp comparators for brightness control and three matched attenuator circuits for contrast control. Each video amplifier contains a gain set for adjusting

maximum system gain (A = 4 to 10) as well as providing trim capability. The LM1203 and LM1203A also contain a voltage reference for the video inputs. The LM1203 and LM1203A are characterized for operation from 0 C to 70 C. 4 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 CC1 CONTRAST CAP CONTRAST CAP R VIDEO IN R CLAMP CAP G VIDEO IN GND G CLAMP CAP B VIDEO IN B CLAMP CAP REF CONTRAST CC1 CLAMP GATE CC1 R GAIN ADJUST R CLAMP(−) R VIDEO OUT R CLAMP(+) CC2 G GAIN ADJUST G CLAMP(−) G VIDEO OUT G CLAMP(+) B GAIN ADJUST B CLAMP(−) B VIDEO OUT B CLAMP(+) N PACKAGE (T0P

VIEW)
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SLFS048 MARCH 1990 − REVISED OCTOBER 1991 POST OFFICE BOX 655303 DALLAS, TEXAS 75265 functional block diagram 14 1.4 V 13 CONTRAST 12 REF 11 CAP B CLAMP 10 ref 2.4 V B VIDEO IN CAP G CLAMP GND G VIDEO IN R CLAMP CAP R VIDEO IN CONTRAST CAP CONTRAST CAP Control Contrast B CLAMP(+) 15 B CLAMP(−) 17 B GAIN ADJUST 18 B VIDEO OUT 16 G CLAMP(+) 19 G CLAMP(−) 21 G GAIN ADJUST 22 G VIDEO OUT 20 23 R CLAMP(+) 24 R CLAMP(−) 26 R GAIN ADJUST 27 R VIDEO OUT 25 CC1 CC1 CLAMP GATE CC2 40 1 k 100 CC1 28 1 k 1 k 100 100 40 40 RED GREEN BLUE absolute maximum

ratings over operating free-air temperature range (unless otherwise noted) Supply voltage, V CC (see Note 1) 13.5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input voltage range, V V CC V GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Video output current 28 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Total power dissipation at (or below) 25 C free-air

temperature (see Note 2) 2.5 W . . . . . . . . . . . . . . . . . . . . . Operating junction temperature 150 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating free-air temperature range 0 C to 70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage temperature range −65 C to 150 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260 . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . NOTES: 1. All V CC pins must be externally wired together to prevent internal damage during V CC power-on/off cycles. 2. For operating above 25 C free-air temperature, derate linearly at the rate of 20 mW/ C.
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Odiff Output voltage difference between any two channels mV 0.5 50 40 SLFS048 − MARCH 1990 − REVISED OCTOBER 1991 POST OFFICE BOX 655303 DALLAS, TEXAS 75265 electrical characteristics at 25 C free-air temperature, V 12 = 6 V, V 14 = 0, V 15 = 2 V, V CC1 = V CC2 = 12 V (see Figure 1) (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT CC Supply current CC1 only 60 90 mA ref Video input reference voltage 2.2 2.4 2.6 IB Video input bias current Any amplifier 20 IL(14) Clamp gate low-level input voltage Clamp comparators on 0.8 1.2 IH(14) Clamp gate high-level input voltage Clamp comparators off 1.6 IL(14) Clamp gate low input current 14 = 0 −0.5 −5 IH(14) Clamp gate high input current 14 = V CC 0.005 K(chg) Clamp capacitor charge current 5,8 or 10 = 0 850 K(dschg) Clamp capacitor discharge current 5,8 or 10 = 5 V −850 OL Low-level output voltage 5,8 or 10 = 0 1.2 OH

High-level output voltage 5,8 or 10 = 5 V 8.9 15 = 2 V 15 = 4 V operating characteristics at 25 C free-air temperature, V 14 = 0 V, V 15 = 4 V, f in = 10 kHz (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Vmax Maximum voltage amplification 12 = 12 V, I(PP) = 560 mV LM1203 LM1203A 8.8 7.8 V/V Vmid Mid-range voltage amplification 12 = 5 V, I(PP) = 560 mV LM1203 LM1203A 3.5 2.5 V/V 12low Contrast voltage for minimum amplification I(PP) = 1 V, See Note 3 Vmax(diff) Amplification match at A max 12 = 12 V, See Note 4 0.2 dB Vmid(diff) Amplification match at A mid 12 = 5 V, See

Note 3 0.2 dB Vlow(diff) Amplification match at A low 12 = V 12low See Notes 3 and 4 0.2 dB THD Total harmonic distortion 12 = 3 V, I(PP) = 1 V 0.5 BW(−3 dB) Amplifier bandwidth 12 = 12 V, See Notes 5 and 7 70 MHz 12 = 12 V, f = 10 kHz, See Note 6 60 Crosstalk attenuation V 12 = 12 V, f = 10 MHz, dB See Notes 6 and 7 NOTES: 3. Determine V 12low for −40-dB attenuation of output. Reference to A maximum. 4. Measure gain difference between any two amplifiers, V I(PP) = 1 V. 5. Adjust input frequency from 10 kHz (A maximum ref level) to the −3-dB corner frequency (f −3 dB).

V I(PP) = 560 mV. 6. V I(PP) = 560 mV at f = 10 kHz to any amplifier. Measure output levels of the other two undriven amplifiers relative to driven amplif ier to determine channel separation. Terminate the undriven amplifier inputs to simulate generator loading. Repeat test at f = 10 M Hz for = 10 MHz. 7. A special text fixture without a socket is required.
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SLFS048 MARCH 1990 − REVISED OCTOBER 1991 POST OFFICE BOX 655303 DALLAS, TEXAS 75265 D.U.T. LM1203A R GAIN ADJUST R CLAMP(−) R VIDEO OUT R CLAMP(+) G GAIN ADJUST G CLAMP(−) G VIDEO OUT G CLAMP(+) B GAIN

ADJUST B CLAMP(−) B VIDEO OUT B CLAMP(+) 14 CONTRAST REF B CLAMP CAP B VIDEO IN G CLAMP CAP GND G VIDEO IN R CLAMP CAP R VIDEO IN CONTRAST CAP CONTRAST CAP 28 27 26 25 24 12 V 10 S26 S21 330 3.3 k SET LEVEL BLACK 23 22 21 20 19 100 18 B OUT 330 S17 17 16 15 CLAMP GATE 0.01 13 12 CONTRAST V REF 11 10 0.01 CC1 CC1 CC1 CC2 CC 5 50 5 50 5 50 5 330 100 100 10 k 10 k 10 k 10 k 10 k 10 k 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 CLAMP GATE R IN G IN B IN 11 12 14 G OUT R OUT Figure 1. Test Circuit
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SLFS048 − MARCH 1990 − REVISED OCTOBER 1991 POST OFFICE

BOX 655303 DALLAS, TEXAS 75265 0.01 Control (Brightness) Black Level Driver Cascode To Blue Adj. Cutoff Green Cascode Driver Supply To LV 60 V P−P VIDEO OUT Supply To HV Green Drive Driver Cascode To Red 100 GATE IN BLACK LEVEL Control Contrast MIN Max VIDEO IN VIDEO IN VIDEO IN R GAIN ADJUST R CLAMP(−) R VIDEO OUT R CLAMP(+) G GAIN ADJUST G CLAMP(−) G VIDEO OUT G CLAMP(+) B GAIN ADJUST B CLAMP(−) B VIDEO OUT B CLAMP(+) CLAMP GATE 14 CONTRAST REF B CLAMP CAP B VIDEO IN G CLAMP CAP GND G VIDEO IN R CLAMP CAP R VIDEO IN CONTRAST CAP CONTRAST CAP 28 27 26 25 24 12 V 23 22

21 20 19 18 17 16 15 13 12 11 10 CC1 CC CC1 0.1 0.1 0.1 0.1 0.1 0.1 0.01 0.1 10 k 5 75 10 k 5 75 10 k 5 10 k 75 5 10 k CC2 51 100 390 51 100 390 91 390 10 k 10 k 1 k CC1 51 Red Drive Figure 2. Typical Application
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SLFS048 MARCH 1990 − REVISED OCTOBER 1991 POST OFFICE BOX 655303 DALLAS, TEXAS 75265 To Clamp Comparator (+) Input or To Clamp Comparator (−) Input VIDEO OUT 27 500 RL H V L V 23 40 16,20,or 25 VIDEO OUT −V 390 R19 Q12 28 5,8,or10 Clamp Cap 0.1 700 Q11 Q10 91 51 100 R11 Q9 1 k R10 Q8 5.4 V Z1 700 12 V 100 13 LM1203A 1 k R3 Q7 R5 Q6 Q5 500 R2 R1 Q2 Q1

Optional 16 k 11 IN VIDEO 10 k 10 4,6,or9 0.02 CONTRAST CAP Q4 Q3 75 CC1 CC1 1.6 k 100 CC1 CC2 40 Figure 3. Simplified Video Amplifier Section With Recommended External Components To Video Input 10 k 11 1 k R22 D2 D1 Z3 4.3 k R21 D4 D3 R24 5 k R23 CONTRAST CAP CAP CONTRAST CONTROL CONTRAST 12 8 k R29 Q17 Q15A R30 Q16 Q15 4.7 k R27 12 k R28 R27A Q14 10 k R26 128 R25 Q13 10 k 10 k 5 k 320 CC1 10 Figure 4. Input Voltage Reference and Contrast Control Circuits
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SLFS048 − MARCH 1990 − REVISED OCTOBER 1991 POST OFFICE BOX 655303 DALLAS, TEXAS 75265 850 GATE CLAMP 14 Q18 5

k R23 Q21 Q19 To Other Channels Q28 Q26 10 k R34 CLAMP+ 15,19, or 24 CLAMP 17,21, or 28 CAP CLAMP 5,8,or 10 Q27 Q25 20 k R23 Q22 Q23 Q24 CC1 R35 20 k Figure 5. Simplified Schematic of LM1203A Clamp Gate (Common to Each Channel) and Clamp Comparator Circuits
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