LM1203A

LM1203A NSC | Alldatasheet

Document overview

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Technical content

Features

Y Three wideband video amplifiers 150 MHz @ b3d B Y Matched ( g0.1 dB or 1.2%) attenuators for contrast control Y Three externally gated comparators for brightness control Y Provisions for individual gain control (Drive) of each video amplifier Y Video input voltage reference Y Low impedance output driver Improvements over LM1203 Y 150 MHz vs 70 MHz bandwidth Y VOUT low: 0.15V vs 0.9V Y tr,t f:4n sv s7n s Y Built in power down spot killer

Applications

Y High resolution RGB CRT monitors Y Video AGC amplifiers Y Wideband amplifiers with gain and DC offset controls Block and Connection Diagrams TL/H/11441–1 FIGURE 1 Order Number LM1203AN See NS Package Number N28B C1996 National Semiconductor Corporation RRD-B30M66/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 1, 13, 23, 28 (Note 3) 13.5V Peak Video Output Source Current (Any One Amp) Pins 16, 20 or 25 28 mA Voltage at Any Input Pin (V IN)V CC t VIN t GND Power Dissipation, (P D) (Above 25 §C derate based on iJA and T J) 2.5W Thermal Resistance ( iJA)5 0 §C/W Junction Temperature (T J) 150 §C ESD Susceptibility (Note 4) 2 kV Storage Temperature b65§Ct o1 5 0 §C Lead Temperature (Soldering, 10 sec.) 265 §C Operating Ratings (Note 2) Temperature Range b20§Ct o a80§C Supply Voltage (V CC) 10.8V s VCC s 13.2V Open; V12 e 6V; V14 e 0V; V15 e 2.0V unless otherwise stated. Symbol Parameter Conditions Typical Limit Units(Note 5) (Note 6) IS Supply Current V CC1 a VCC2,R L e % (Note 7) 70 95 mA (max) V11 Video Input Reference Voltage 2.8

2.5 V (min)

3.1 V (max)

IB Video Input Bias Current Any One Amplifier 7 20 mA (max) V14L Clamp Gate Low Input Voltage Clamp Comparators On 1.2 0.8 V (max) V14H Clamp Gate High Input Voltage Clamp Comparators Off 1.6 2.0 V (min) I14L Clamp Gate Low Input Current V14 e 0V b1 b5.0 mA (max) I14H Clamp Gate High Input Current V14 e 12V 0.07 0.2 mA (max) ICLAMPa Clamp Cap Charge Current V5, 8 or 10 e 0V 750 500 mA (min) ICLAMPb Clamp Cap Discharge Current V5, 8 or 10 e 5V b750 b500 mA (min) VOL Video Output Low Voltage V5, 8 or 10 e 0V 0.15 0.5 V (max) VOH Video Output High Voltage V5, 8 or 10 e 5V 7.5 7 V (min) DVO(2V) Video Output Offset Voltage Between Any Two 2 g25 mV (max)Amplifiers, V15 e 2V DVO(4V) Video Output Offset Voltage Between Any Two 2 g25 mV (max)Amplifiers, V15 e 4V http:/ /www.national.com 2

Closed; V14 e 0V; V15 e 4V unless otherwise stated. Symbol Parameter Conditions Typical Limit Units(Note 5) (Note 6) AV max Video Amplifier Gain V12 e 12V, V IN e 560 mV PP 6.5 4.5 V/V (min) DAV5 V Attenuation @ 5V Ref: A V max, V12 e 5V b8d B DAV2 V Attenuation @ 2V Ref: A V max, V12 e 2V b30 dB AV match Absolute Gain Match @ AV max V12 e 12V (Note 8) g0.3 dB DAV track 1 Gain Change Between Amplifiers V12 e 5V (Notes 8, 9) g0.1 dB DAV track 2 Gain Change Between Amplifiers V12 e 5V (Notes 8, 9) g0.3 dB THD Video Amplifier Distortion V12 e 3V, V O e 1V PP 1% f( b3 dB) Video Amplifier Bandwidth V12 e 12V, V O e 4V PP 100 MHz(Notes 10, 11) (No External Peaking Capacitor) f( b3 dB) Video Amplifier Bandwidth V12 e 12V, V O e 4V PP (Notes 10, 11) With 18 pF Peaking Cap from 150 MHz Pins 18, 22 and 27 to GND tr Output Rise Time (Note 10) V O e 4V PP 3n s(No External Peaking Capacitor) tf Output Fall Time (Note 10) V O e 4V PP 4n s(No External Peaking Capacitor) Vsep 10 kHz Video Amplifier 10 kHz Isolation V12 e 12V (Note 12) b70 dB Vsep 10 MHz Video Amplifier 10 MHz Isolation V12 e 12V (Notes 10, 12) b50 dB 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 1, 13, 23, 28 must be externally wired together to prevent internal damage during V CC power on/off cycles. Note 4: Human body model, 100 pF discharged through a 1.5 k X resistor. Note 5: Typical specifications are specified at a25§C and represent the most likely parametric norm. Note 6: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). Note 7: The supply current specified is the quiescent current for V CC1 and V CC2 with R L e %, see Figure 2’s test circuit. The supply current for V CC2 (pin 23) also depends on the output load. With video output at 2V DC, the additional current through V CC2 is 18 mA for Figure 2’s test circuit. Note 8: Measure gain difference between any two amplifiers. V IN e 1V PP. Note 9: D AV track 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 (V12) at either 5V or 2V measured relative to an A V max condition, V12 e 12V. For example, at measured typical g0.1 dB channel tracking. Note 10: When measuring video amplifier bandwidth or pulse rise and fall times, a double sided full ground plane printed circuit board without socket is recommended. Video amplifier 10 MHz isolation test also requires this printed circuit board. Note 11: Adjust input frequency from 10 kHz (A V max reference level) to the b3 dB corner frequency (f b3d B ). Note 12: Measure output levels of the other two undriven amplifiers relative to the driven amplifier to determine channel separation. Terminate the undriven amplifier inputs to simulate generator loading. Repeat test at f IN e 10 MHz for V sep e 10 MHz. http:/ /www.national.com3

FIGURE 2. LM1203A Test Circuit

Typical Performance Characteristics VCC e 12V, T A e 25§C unless otherwise specified (Continued) Crosstalk vs Frequency TL/H/11441–4 Frequency Response Using Various Peaking Caps TL/H/11441–5 Attenuation vs Contrast Voltage TL/H/11441–6 http:/ /www.national.com5

the rise and fall times of the LM1203A can be increased for EMI considerations. FIGURE 3. LM1203A Typical Application

be connected between the video output pin and ground. FIGURE 5. Block Diagram of LM1203A Video Amplifier with Contrast and Black Level Control

FIGURE 6. Simplified Schematic of LM1203A Video Amplifier Section with Recommended External Components

FIGURE 8. Simplified Schematic of LM1203A Clamp Gate Circuit

FIGURE 9. Simplified Schematic of LM1203A Clamp Comparator Circuits

FIGURE 11. LM1203A Applications Circuit

LM1203A is an improved version of the LM1203 RGB video amplifier system and is pin and function compatible with the LM1203. LM1203A’s output voltage can swing as low as 0.15V as opposed to 0.9V for the LM1203. This eliminates the need for a level shift stage between the preamplifier and the CRT driver in most applications. The LM1203A also offers faster rise and fall times of 4 ns vs 7 ns for the LM1203 and 100 MHz bandwidth vs 70 MHz for LM1203. With a peaking capacitor across the drive resistor, LM1203A’s bandwidth can be extended to 150 MHz. Be- cause of LM1203A’s wide bandwidth, the device may oscil- late if plugged directly into an existing LM1203 board. For optimum performance and stable operation, a double sided printed circuit board with adequate ground plane and power supply decoupling as close to the V CC pins as possible is recommended. Figure 12 shows the layout of the PC board for Figure 11’s circuit. For suggestions on optimum PC board layout, please see the reference section below. The LM1203A also includes a built-in power down spot killer to prevent a flash on the screen upon power down. In some preamplifiers, the video output signal may go high as the device is being powered down. This may cause a whiter than white level at the output of the CRT driver, thus caus- ing a flash on the screen. REFERENCE Ott, Henry W. Noise Reduction Techniques in Electronic Systems, John Wiley & Sons, New York, 1976. TL/H/11441–16 FIGURE 12(a). PC Board Silk Screen http:/ /www.national.com15

Additional Applications of the LM1203A (Continued) TL/H/11441–17 FIGURE 12(b). PC board layout of bottom side. Top side of PC board (not shown) is full ground plane. http:/ /www.national.com 16

http:/ /www.national.com17

LM1203A 150 MHz RGB Video Amplifier System Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM1203AN LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.

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a49 (0) 180-530 85 86 13th Floor, Straight Block, Tel: 81-043-299-2308 Arlington, TX 76017 Email: europe.support @ nsc.com Ocean Centre, 5 Canton Rd. Fax: 81-043-299-2408 Tel: 1(800) 272-9959 Deutsch Tel: a49 (0) 180-530 85 85 Tsimshatsui, Kowloon Fax: 1(800) 737-7018 English Tel: a49 (0) 180-532 78 32 Hong Kong Fran3ais Tel: a49 (0) 180-532 93 58 Tel: (852) 2737-1600 http:/ /www.national.com Italiano Tel: a49 (0) 180-534 16 80 Fax: (852) 2736-9960 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.