Download: PRELIMINARY LM1889 TV Video Modulator General Description Features Block Diagram DC Test Circuit

PRELIMINARY April 1987 LM1889 TV Video Modulator General Description Features The LM1889 is designed to interface audio, color difference, Y dc channel switching and luminance signals to the antenna terminals of a TV re- Y 12V to 18V supply operation ceiver. It consists of a sound subcarrier oscillator, chroma Y Excellent oscillator stability subcarrier oscillator, quadrature chroma modulators, and Y Low intermodulation products RF oscillators and modulators for two low-VHF channels. Y 5 Vp-p chroma reference signal The LM1889 allows video information from VTR’s, games, Y May be used to encode...
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PRELIMINARY

April 1987

LM1889 TV Video Modulator General Description Features

The LM1889 is designed to interface audio, color difference, Y dc channel switching and luminance signals to the antenna terminals of a TV re- Y 12V to 18V supply operation ceiver. It consists of a sound subcarrier oscillator, chroma Y Excellent oscillator stability subcarrier oscillator, quadrature chroma modulators, and Y Low intermodulation products RF oscillators and modulators for two low-VHF channels. Y 5 Vp-p chroma reference signal The LM1889 allows video information from VTR’s, games, Y May be used to encode composite video test equipment, or similar sources to be displayed on black and white or color TV receivers. When used with the MM57100 and MM53104, a complete TV game is formed.

Block Diagram DC Test Circuit

Dual-In-Line Package TL/H/7917–2 TL/H/7917–1 Order Number LM1889N See NS Package Number N18A C1995 National Semiconductor Corporation TL/H/7917 RRD-B30M115/Printed in U. S. A.

LM1889 TV Video Modulator

,

Absolute Maximum Ratings

If Military/Aerospace specified devices are required, Storage Temperature Range b55§C to a150§C please contact the National Semiconductor Sales Chroma Osc Current I17 max 10 mADC Office/Distributors for availability and specifications. (V16–V15) max g5 VDC Supply Voltage V14, V16 max 19 VDC (V14–V10) max 7V Power Dissipation Package (Note 1) 1800 mW (V14–V11) max 7V Operating Temperature Range 0§C to a70§C Lead Temperature (Soldering, 10 sec.) 260§C

DC Electrical Characteristics (dc Test Circuit, All SW Normally Pos. 1, VA e 15V, VB e VC e 12V)

Symbol Parameter Conditions Min Typ Max Units IS Supply Current 20 35 45 mA DI15 Sound Oscillator, Current Change VA from 12.5 to 0.3 0.6 0.9 mA Change 17.5V V17 Chroma Oscillator Balance 9.5 11.0 12.5 V V13 Chroma Modulator Balance 7.0 7.4 7.8 V DV13 R-Y Modulator Output Level SW 3, Pos. 2, Change SW 1 0.6 0.9 1.2 V from Pos. 1 to Pos. 2 DV13 B-Y Modulator Output Level SW 3, Pos. 2, Change SW 2 0.6 0.9 1.2 V from Pos. 1 to Pos. 2 DV13/DV3 Chroma Modulator SW 3, Pos. 2, Change SW 0 Conversion Ratio from Pos. 1 to Pos. 2 Divide 0.45 0.70 0.95 V/V DV13 by DV3 V8, V9 Ch. A Oscillator ‘‘OFF’’ Voltage SW 4, Pos. 2 1.0 3.0 V I9 Ch. A Oscillator Current Level VB e 12V, VC e 13V 3.0 4.0 5.5 mA V6, V7 Ch. B Oscillator ‘‘OFF’’ Voltage 1.0 3.0 V I6 Ch. B Oscillator Current Level SW 4, Pos. 2, VB e 12V, 3.0 4.0 5.5 mA VC e 13V DV11/(V13–V12) Ch. A Modulator Conversion Ratio SW 1, SW2, SW 3, Pos. 2, Measure DV11(V10) by Changing from VB e 12.5V, 0.35 0.55 0.75 V/V VC e 11.5V to VB e 11.5V, VC e 12.5V and Divide by V13–V12 DV10/(V13–V12) Ch. B Modulator Conversion Ratio Divide as Above 0.35 0.55 0.75 V/V

AC Electrical Characteristics (AC Test Circuit, V e 15V)

Symbol Parameter Conditions Min Typ Max Units V17 Chroma Oscillator Output Level CLOAD s 20 pF45Vp-p V15 Sound Carrier Oscillator Level Loaded by RC Coupling234Vp-p Network V8, V9 Ch. 3 RF Oscillator Level Ch. SW. Pos. 3, f e 61.25 MHz, 200 350 mVp-p Use FET Probe V6, V7 Ch. 4 RF Oscillator Level Ch. Sw. Pos. 4, f e 67.25 MHz 200 350 mVp-p Use FET Probe Note 1: For operation in ambient temperatures above 25§C, the device must be derated based on a 150§ maximum junction temperature and a thermal resistance of 70§C C/W junction to ambient.,

Design Characteristics (AC Test Circuit, V e 15V)

Parameter Typ Units Parameter Typ Units Oscillator Supply Dependence RF Modulator Chroma, fo e 3.579545 MHz 3 Hz/V Conversion Gain, f e 61.25 MHz, Sound Carrier, RF See Curves VOUT/(V13–V12) 10 mVrms/V Oscillator Temperature Dependence (IC Only) 3.58 MHz Differential Gain 5 % Chroma 0.05 ppm/§C Differential Phase 3 degrees Sound Carrier b15 ppm/§C 2.5 Vp-p Video, 87.5% mod. RF b50 ppm/§C Output Harmonics below Carrier Chroma Oscillator Output, Pin 17 2nd, 3rd b12 dB tRISE, 10–90% 20 ns 4th and above b20 dB tFALL, 90–10% 30 ns Input Impedances Duty Cycle (a) Half Cycle 51 % Chroma Modulator, Pins 2, 4 500k//2 pF (b) Half Cycle 49 % RF Modulator, Pin 12 1M//2 pF RF Oscillator Maximum Operating Frequency 100 MHz Pin 13 250k//3.5 pF (Temperature Stability Degraded) Chroma Modulator (f e 3.58 MHz) B-Y Conversion Gain V13/(V4–V3) 0.6 Vp-p/V R-Y Conversion Gain V13/(V2–V3) 0.6 Vp-p/V Gain Balance g0.5 dB Bandwidth See Curve,

AC Test Circuit

TL/H/7917–3,

Typical Performance Characteristics

Sound Carrier Oscillator RF Oscillator Frequency Chroma Modulator Supply Dependence Supply Dependence Transconductance Bandwidth (fo e 4.5 MHz) (fo e 67.25 MHz) IOUT 13/V1 or 18 Chroma Modulator RF Modulator Common-Mode Input Range Common-Mode Input Range Pins 2, 3, 4 Pins 12, 13 (Application Circuit) TL/H/7917–4

Circuit Description (Refer to Circuit Diagram)

The sound carrier oscillator is formed by differential amplifi- The channel B oscillator consists of devices Q56 and Q57 er Q3, Q4 operated with positive feedback from the pin 15 cross-coupled through level-shift zener diodes Q54 and tank to the base of Q4. Q55. A current regulator consisting of devices Q39–Q43 is The chroma oscillator consists of the inverting amplifier used to achieve good RF frequency stability over supply and Q16, Q17 and Darlington emitter follower Q11, Q12. An ex- temperature. The channel B modulator consists of multiplier ternal RC and crystal network from pin 17 to pin 18 provides devices Q58, Q59 and Q50–Q53. The top quad is coupled an additional 180 degrees phase lag back to the base of to the channel B tank through isolating devices Q48 and Q17 to produce oscillation at the crystal resonance frequen- Q49. A dc offset between pins 12 and 13 offsets the lower cy. (See AC test circuit). pair to produce an output RF carrier at pin 10. That carrier is then modulated by both the chroma signal at pin 13 and the The feedback signal from the crystal is split in a lead-lag video and sound carrier signals at pin 12. The channel A network to pins 1 and 18, respectively, to generate the sub- modulator shares pin 12 and 13 buffers Q45 and Q44 with carrier reference signals for the chroma modulators. The R- channel B and operates in an identical manner. Y modulator consists of multiplier devices Q29, Q30 and Q21–Q24, while the B-Y modulator consists of Q31, Q32 The current flowing through channel B oscillator diodes and Q25–Q28. The multiplier outputs are coupled through a Q54, Q55 is turned around in Q60, Q61 and Q62 to source balanced summing amplifier Q37, Q38 to the input of the RF current for the channel B RF modulator. In the same man- modulators at pin 13. With 0 offset at the lower pairs of the ner, the channel A oscillator Q71–Q74 uses turn around multipliers, no chroma output is produced. However, when Q77, Q78 and Q79 to source the channel A modulator. One either pin 2 or pin 4 is offset relative to pin3asubcarrier oscillator at a time may be activated by connecting its tank output current of the appropriate phase is produced at pin to supply (see ac test circuit). The corresponding modulator 13. is then activated by its current turn-around, and the other oscillator/modulator combination remains ‘‘OFF’’.,

Circuit Diagram

TL/H/7917–5,

TV Game Schematic

Note: All capacitors in mF. All resistors in X. *CENTRALAB Model 2 ULTRALIFE potenti- ometer or equivalent. TL/H/7917–6,

Applications Information

Subcarrier Oscillator Sound Oscillator The oscillator is a crystal-controlled design to ensure the Frequency modulation is achieved by using a 4.5 MHz tank accuracy and stability required of the subcarrier frequency circuit and deviating the center frequency via a capacitor or for use with television receivers. Lag-lead networks (R2C2 a varactor diode. Switchinga5pF capacitor to ground at an and C1R1) define a quadrature phase relationship between audio frequency rate will cause a 50 kHz deviation from pins 1 and 18 at the subcarrier frequency of 3.579545 MHz. 4.5 MHz. A 1N5447 diode biassed b4V from pin 16 will give Other frequencies can be used and where high stability is g20 kHz deviation witha1Vp-p audio signal. The coupling not a requirement, the crystal can be replaced with a paral- network to the video modulator input and the varactor diode lel resonant L-C tank circuitÐto providea2MHz clock, for bias must be included when the tank circuit is tuned to cen- example. Note that since one of the chrominance modula- ter frequency. tors is internally connected to the feedback path of the os- A good level for the RF sound carrier is between 2% and cillator, operation of the oscillator at other than the correct 20% of the picture carrier level. For example, if the peak subcarrier frequency precludes chrominance modulation. video signal offset of pin 12 with respect to pin 13 is 3V, this When an external subcarrier source is available or pre- corresponds to a 30 mVrms picture RF carrier. The source ferred, this can be used instead. For proper modulator oper- impedance at pin 12 is defined by the external 2 kX resistor ation, a subcarrier amplitude of 500 mVp-p is required at and so a series network of 15 kX and 24 pF will give a pins 1 and 18. If the quadrature phase shift networks shown sound carrier level at b32 dB to the picture carrier. in the application circuit are retained, about 1 Vp-p subcarri- RF Modulation er injected at the junction of C1 and R2 is sufficient. The crystal, C4 and R3 are eliminated and pin 17 provides a Two RF channels are available, with carrier frequencies up 5 Vp-p signal shifted a125§C from the external reference. to 100 MHz being determined by L-C tank circuits at pins 6, 7, 8 and 9. The signal inputs (pins 12, 13) to both modula- Chrominance Modulation tors are common, but removing the power supply from an The simplest method of chroma encoding is to define the RF oscillator tank circuit will also disable that modulator. quadrature phases provided at pins 1 and 18 as the color As with the chrominance modulators, it is the offset be- difference axes R-Y and B-Y. A signal at pin 2 (R-Y) will give tween the two signal input pins that determines the level of a chrominance subcarrier output from the modulator with a RF carrier output. Since one signal input (pin 13) is also relative phase of 90§C compared to the subcarrier output internally connected to the chrominance modulators, the produced by a signal at pin 4 (B-Y). The zero signal dc level 2 kX load resistor at this point should be connected to a of the R-Y and B-Y inputs will determine the bias level re- bias source within the common-mode input range of the vid- quired at pin 3. For example, a pin 2 signal that is 1V posi- eo modulators. However, this bias source is independent of tive with respect to pin 3 will give 0.6 Vp-p subcarrier at a the chrominance modulator bias and where chrominance relative phase of 90§C. If pin 2 is 1V negative with repsect to modulation is not used, the 2 kX resistor is eliminated and pin 3, the output is again 0.6 Vp-p, but with a relative phase the bias source connected directly to pin 13. of 270§C. When a simultaneous signal exists at pin 4, the To preserve the dc content of the video signal, amplitude subcarrier output level and phase will be the vector sum of modulation of the RF carrier is done in one direction only, the quadrature components produced by pin 2 and 4 inputs. with increasing video (toward peak white) decreasing the Clearly, with the modulation axes defined as above, a nega- carrier level. This means the active composite video signal tive pulse on pin 4 during the burst gate period will produce at pin 12 must be offset with respect to pin 13 and the sync the chrominance synchronizing ‘‘burst’’ with a phase of pulse should produce the largest offset (i.e., the offset volt- 180§. Both color difference signals must be dc coupled to age of pin 12 with respect to pin 13 should have the same the modulators and the zero signal dc level of both must be polarity as the sync pulses. the same and within the common-mode range of the modu- lators. The largest video signal (peak white) should not be able to suppress the carrier completely, particularly if sound trans- The 0.6 Vp-p/Vdc conversion gain of the chrominance mod- mission is needed. For example, a signal with 1V sync am- ulators is obtained witha2kX resistor connected at pin 13. plitude and 2.5V peak white (3.5 Vp-p, negative polarity Larger resistor values can be used to increase the gain, but sync) and a black level at5Vwill require a dc bias of 8V capacitance at pin 13 will reduce the bandwidth. Notice that dc on pin 13 for correct modulation. A simple way of obtaining equi-bandwidth encoding of the color difference signals is the required offset is to bias pin 13 at4x(sync amplitude) implied as both modulator outputs are internally connected from the sync tip level at pin 12. and summed into the same load resistor.,

Applications Information (Continued)

Split Power Supplies DC Clamped Inputs The LM1889 is designed to operate over a wide range of Utilizing a DC clamp will make matching the LM1889 to supply voltages so that much of the time it can utilize the available signal generator outputs a simple process. Figure signal source power supplies. An example of this is shown 3 shows the LM1889 configured to accept the composite in Figure 2 where the composite video signal from a charac- video patterns available from a Tektronix Type 144 genera- ter generator is modulated onto an RF carrier for display on tor that has black level at ground and negative polarity a conventional home TV receiver. The LM1889 is biased syncs. In this application, the chroma oscillator amplifier is between the b12V and a5V supplies and pin 13 is put at used to provide a gain of two. The 100k pot adjusts the ground. A 9.1 kX resistor from pin 12 to b12V dc offsets overall DC level of the amplified signal which determines the the video input signal (which has sync tips at ground) to modulation depth of the RF output. Clamping the input re- establish the proper modulation depth b R1/R2 e VIN/12 quires a minimum of DC correction to obtain the correct DC x 0.875. This design is for monochrome transmission and output level. This allows the adjustment to be a high imped- features an extremely low external parts count. ance that will have minimum effect on the amplifier closed loop gain. TL/H/7917–7 FIGURE 1. Luminance and Chrominance Encoding Composite Video or RF Output,

Applications Information (Continued)

TL/H/7917–8 FIGURE 2. Low-Cost Monochrome Modulator for Character Generator Display TL/H/7917–9 FIGURE 3. DC Clamped Modulator for NTSC Pattern Generators,

Physical Dimensions inches (millimeters) Molded Dual-In-Line Package (N) Order Number LM1889N See NS Package Number N18A 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. 1111 West Bardin Road Fax: (a49) 0-180-530 85 86 13th Floor, Straight Block, Tel: 81-043-299-2309 Arlington, TX 76017 Email: cnjwge@ tevm2.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 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.

LM1889 TV Video Modulator

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