INTEGRATED CIRCUITS DATA SHEET TDA2579B Horizontal/vertical synchronization circuit Preliminary specification File under Integrated Circuits, IC02 September 1990 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit TDA2579B GENERAL DESCRIPTION The TDA2579B generates and synchronizes horizontal and vertical signals. The device has a 3 level sandcastle output; a transmitter identification signal and also 50/60 Hz identification. Features • Horizontal phase detector, (sync to oscillator), sync separator and noise inverter • Triple current source in the phase detector with automatic selection • Second phase detector for storage compensation of the horizontal output • Stabilized direct starting of the horizontal oscillator and output stage from mains supply • Horizontal output pulse with constant duty cycle value of 29 µs • Internal vertical sync separator, and two integration selection times • Divider system with three different reset enable windows • Synchronization is set to 628 divider ratio when no vertical sync pulses and no video transmitter is identified • Vertical comparator with a low DC feedback signal • 50/60 Hz identification output combined with mute function • Automatic amplitude adjustment for 50 and 60 Hz and blanking pulse duration • Automatic adaption of the burst-key pulsewidth PACKAGE OUTLINE 18-lead dual in line; plastic (SOT 102); SOT102-1; 1996 November 19. September 1990 2 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit TDA2579B QUICK REFERENCE DATA PARAMETER CONDITION SYMBOL MIN. TYP. MAX. UNIT Supply Minimum required current for starting I16 6.2 − − mA Main supply voltage V10 − 12 − V Supply current I10 − 70 − mA Sync pulse input amplitude V5(p-p) 0.05 − 1.0 V Horizontal flyback pulse input current I12 − 1 − mA Voltage AC V2 − 0.8 − V Voltage DC V2 − 1 − V V11 − − 0.5 V V1 5 − − V V17 burst-key V17 9.8 − − V horizontal blanking V17 − 4.5 − V vertical blanking V17 − 2.5 − V V13 − − 0.5 V I13 − − 5 mA divider ratio > 576 V13 − V10 − V divider ratio < 576 V13 − 7.65 − V horizontal oscillator and output stage Input signals Vertical comparator input signal Output signals Horizontal output (open collector) I11 = 25 mA Vertical output stage driver (emitter follower) I1 = 1.5 mA Sandcastle output levels Video transmitter identification output stage (open collector loaded with external resistor to positive supply). No sync. pulse present Sync pulse present September 1990 3 Philips Semiconductors Preliminary specification TDA2579B Fig.1 Block diagram. Horizontal/vertical synchronization circuit September 1990 4 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit TDA2579B FUNCTIONAL DESCRIPTION Vertical part (pins 1,2,3,4) The IC embodies a synchronized divider system for generating the vertical sawtooth at pin 3. The divider system has an internal frequency doubling circuit, so the horizontal oscillator is working at its normal line frequency and one line period equals 2 clock pulses. Due to the divider system no vertical frequency adjustment is needed. The divider has a discriminator window for automatically switching over from the 60 Hz to 50 Hz system. The divider system operates with 3 different divider reset windows for maximum interference/disturbance protection. The windows are activated via an up/down counter. The counter increases its counter value by 1 for each time the separated vertical sync pulse is within the searched window. The count is decreased by 1 when the vertical sync pulse is not present. Large (search) window: divider ratio between 488 and 722 This mode is valid for the following conditions: 1. Divider is looking for a new transmitter. 2. Divider ratio found, not within the narrow window limits. 3. Up/down counter value of the divider system operating in the narrow window mode decreases below count 1. 4. Externally setting. This can be reached by loading pin 18 with a resistor of 220 kΩ to earth or connecting a 3.6 V diode stabistor between pin 18 and ground. Narrow window: divider ratio between 522-528 (60 Hz) or 622-628 (50 Hz). The divider system switches over to this mode when the up/down counter has reached its maximum value of 12 approved vertical sync pulses. When the divider operates in this mode and a vertical sync pulse is missing within the window the divider is reset at the end of the window and the counter value is decreased by 1. At a counter value below count 1 the divider system switches over to the large window mode. Standard TV-norm When the up/down counter has reached its maximum value of 12 in the narrow window mode, the information applied to the up/down counter is changed such that the standard divider ratio value is tested. When the counter has reached a value of 14 the divider system is changed over to the standard divider ratio mode. In this mode the divider is always reset at the standard value even if the vertical sync pulse is missing. A missed vertical sync pulse decreases the counter value by 1. When the counter reaches the value of 10 the divider system is switched over to the large window mode. The standard TV-norm condition gives maximum protection for video recorders playing tapes with anti-copy guards. No-TV-transmitter found: (pin 18 < 1.2 V) In this condition, only noise is present, the divider is rest to count 628. In this way a stable picture display at normal height is achieved. Video tape recorders in feature mode It should be noted that some VTRs operating in the feature modes, such as picture search, generate such distorted pictures that the no-TV-transmitter detection circuit can be activated as pin V18 drops below 1.2 V. This would imply a rolling picture (see Phase detector, sub paragraph d). In general VTR-machines use a re-inserted vertical sync pulse in the feature mode. Therefore the divider system has been made such that the automatic reset of the divider at count 628 when V18 is below 1.2 V is inhibited when a vertical sync pulse is detected. The divider system also generates the anti-top-flutter pulse which inhibits the Phase 1 detector during the vertical sync. pulse. The width of this pulse depends on the divider mode. For the divider mode a the start is generated at the reset of the divider. In mode b and c the anti-top-flutter pulse starts at the beginning of the first equalizing pulse. September 1990 5 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit TDA2579B The anti-top-flutter pulse ends at count 8 for 50 Hz and count 10 for 60 Hz. The vertical blanking pulse is also generated via the divider system. The start is at the reset of the divider while the pulse ends at count 34 (17 lines) for 60 Hz, and at count 44 (22 lines) for 50 Hz systems. The vertical blanking pulse generated at the sandcastle output pin 17 is made by adding the anti-top-flutter pulse and the blanking pulse. In this way the vertical blanking pulse starts at the beginning of the first equalizing pulse when the divider operates in the b or c mode. For generating a vertical linear sawtooth voltage a capacitor should be connected to pin 3. The recommended value is 150 nF to 330 nF (see Fig.1). The capacitor is charged via an internal current source starting at the reset of the divider system. The voltage on the capacitor is monitored by a comparator which is activated also at reset. When the capacitor has reached a voltage value of 5.85 V for the 50 Hz system or 4.85 V for the 60 Hz system the voltage is kept constant until the charging period ends. The charge period width is 26 clock pulses. At clock pulse 26 the comparator is switched off and the capacitor is discharged by an npn transistor current source, the value of which can be set by an external resistor between pin 4 and ground (pin 9). Pin 4 is connected to a pnp transistor current source which determines the current of the npn current source at pin 3. The pnp current source on pin 4 is connected to an internal zener diode reference voltage which has a typical voltage of ≈ 7.5 volts. The recommended operating current range is 10 to 75 µA. The resistance at pin R4 should be 100 to 770 kΩ. By using a double current mirror concept the vertical sawtooth pre-correction can be set on the desired value by means of external components between pin 4 and pin 3, or by connecting the pin 4 resistor to the vertical current measuring resistor of the vertical output stage. The vertical amplitude is set by the current of pin 4. The vertical feedback voltage of the output stage has to be applied to pin 2. For the normal amplitude adjustment the values are DC = 1 V and AC = 0.8 V. Due to the automatic system adaption both values are valid for 50 Hz and 60 Hz. The low DC voltage value improves the picture bounce behaviour as less parabola compensation is necessary. Even a fully DC coupled feedback circuit is possible. Vertical guard The IC also contains a vertical guard circuit. This circuit monitors the vertical feedback signal on pin 2. When the level on pin 2 is below 0.35 V or higher than 1.85 V the guard circuit inserts a continuous level of 2.5 V in the sandcastle output signal of pin 17. This results in the blanking of the picture displayed, thus preventing a burnt-in horizontal line. The guard levels specified refer to the zener diode reference voltage source level. Driver output The driver output is at pin 1, it can deliver a drive current of 1.5 mA at 5 V output. The internal impedance is approximately 170 Ω. The output pin is also connected to an internal current source with a sink current of 0.25 mA. Sync separator, phase detector and TV-station identification (pins 5,6,7,8 and 18) The video input signal is connected to pin 5. The sync separator is designed such that the slicing level is independent of the amplitude of the sync pulse. The black level is measured and stored in the capacitor at pin 7. The slicing level value is stored in the capacitor at pin 6. The slicing level value can be chosen by the value of the external resistor between pins 6 and 7. The value is given by the formula: Rs P = --------------------- × 100 ( R s value in kΩ ) 5.3 + R s Where Rs is the resistor between pins 6 and 7 and top sync level equals 100%. The recommended resistor value is 5.6 kΩ. September 1990 6 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit TDA2579B Black level detector A gating signal is used for the black level detector. This signal is composed of an internal horizontal reference pulse with a duty factor of 50% and the flyback pulse at pin 12. In this way the TV-transmitter identification operates also for all DC conditions at input pin 5 (no video modulation, plain carrier only). During the frame interval the slicing level detector is inhibited by a signal which starts with the anti-top flutter pulse and ends with the reset vertical divider circuit. In this way shift of the slicing level due to the vertical sync signal is reduced and separation of the vertical sync pulse is improved. Noise level detector An internal noise inverter is activated when the video level at pin 5 decreases below 0.7 V. The IC also embodies a built-in sync pulse noise level detection circuit. This circuit is directly connected to pin 5 and measures the noise level at the middle of the horizontal sync pulse. When a signal-to-noise level of 19 dB is detected a counter circuit is activated. A video input signal is processed as “acceptable noise free” when 12 out of 15 sync pulses have a noise level below 19 dB for two successive frame periods. The sync pulses are processed during a 15 line width gating period generated by the divider system. The measuring circuit has a built-in noise level hysteresis of approximately 3 dB. When the “acceptable noise free” condition is found the phase detector of pin 8 is switched to not gated and normal time constant. When a higher sync pulse noise level is found the phase detector is switched over to slow time constant and gated sync pulse phase detection. At the same time the integration time of the vertical sync pulse separator is adapted. Video voltage ( black to white p-p ) S ⁄ N = 20 Log --------------------------------------------------------------------------------------------------Noise rms Phase detector The phase detector circuit is connected to pin 8. This circuit consists of 3 separate phase detectors which are activated depending on the voltage of pin 18 and the state of the sync pulse noise detection circuit. For normal and fast time constants all three phase detectors are activated during the vertical blanking period, this with the exception of the anti-top-flutter pulse period, and the separated vertical sync-pulse time. As a result, phase jumps in the video signal related to the video head, take over of video recorders are quickly restored within the vertical blanking period. At the end of the blanking period the phase director time constant is increased by 1.5 times. In this way there is no requirement for external VTR time constant switching, and so all station numbers are suitable for signals from VTR, video games or home computers. For quick locking of a new TV station starting from a noise only signal condition (normal time constant) a special circuit is incorporated. A new TV station which is not locked to the horizontal oscillator will result in a voltage decrease below 0.1 V at pin 18. This will activate a frame period counter which switches the phase detector to fast for 3 frame periods during the vertical scan period. The horizontal oscillator will now lock to the new TV-station and as a result, the voltage on pin 18 will increase to approximately 6.5 V. When pin 18 reaches a level of 1.8 V the mute output transistor of pin 13 is switched OFF and the divider is set to the large window. In general the mute signal is switched OFF within 5 ms (pin C18 = 47 nF) after reception of a new TV-signal. When the voltage on pin 18 reaches a level of 5 V, usually within 15 ms, the frame counter is switched OFF and the time constant is switched from fast to normal during the vertical scan period. September 1990 7 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit TDA2579B If the new TV station is weak, the sync-noise detector is activated. This will result in a change over of pin 18 voltage from 6.5 V to ≈10 V. When pin 18 exceeds the level of 7.8 V the phase detector is switched to slow time constant and gated sync pulse condition. The current is also reduced during the vertical blanking period by 1 mA. When desired, most conditions of the phase detector can also be set by external means in the following way: a. Fast time constant TV transmitter identification circuit not active, connect pin 18 to earth (pin 9). b. Fast time constant TV transmitter identification circuit active, connect a resistor of 220 kΩ between pin 18 and ground. This condition can also be set by using a 3.6 V stabistor diode instead of a resistor. c. Slow time constant, (with exception of frame blanking period), connect pin 18 via a resistor of 10 kΩ to + 12 V, pin 10. In this condition the transmitter identification circuit is not active. d. No switching to slow time constant desired (transmitter identification circuit active), connect a 6.8 V zener diode between pin 18 and ground. Fig.2 illustrates the operation of the 3 phase detector circuits. Fig.2 Timing diagram, phase detectors. September 1990 8 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit TDA2579B Supply (pins 9, 10 and 16) The IC has been designed such that the horizontal oscillator and output stage can start operating by application of a very low supply current into pin 16. The horizontal oscillator starts at a supply current of approximately 4 mA. The horizontal output stage is forced into the non-conducting stage until the supply current has a typical value of 5 mA. The circuit has been designed so that after starting the horizontal output function a current drop of ≈ 1 mA is allowed. The starting circuit has the ability to derive the main supply (pin 10) from the horizontal output stage. The horizontal output signal can also be used as the oscillator signal for synchronized switched mode power supplies. The maximum allowed starting current is 9.7 mA (Tamb = 25 °C). The main supply should be connected to pin 10, and pin 9 should be used as ground. When the voltage on pin 10 increases from zero to its final value (typically 12 V) a part of the supply current of the starting circuit is taken from pin 10 via internal diodes, and the voltage on pin 16 will stabilize to a typical value of 9.4 V. In a stabilized condition (pin V10 > 10 V) the minimum required supply current to pin 16 is ≈ 2.5 mA. All other IC functions are switched on via the main supply voltage on pin 10. When the voltage on pin 10 reaches a value of ≈ 7 V the horizontal phase detector circuit is activated and the vertical ramp on pin 3 is started. The second phase detector circuit and burst pulse circuit are started when the voltage on pin 10 reaches the stabilized voltage value of pin 16 which is typically 9.4 V. To close the second phase detector loop, a flyback pulse must be applied to pin 12. When no flyback pulse is detected the duty factor of the horizontal output stage is 50%. For remote switch-off pin 16 can be connected to ground (via a npn transistor with a series resistor of ≈ 500 Ω) which switches off the horizontal output. Horizontal oscillator, horizontal output transistor, and second phase detector (pins 11, 12, 14 and 15) The horizontal oscillator is connected to pin 15. The frequency is set by an external RC combination between pin 15 and ground, pin 9. The open collector horizontal output stage is connected to pin 11. An internal zener diode configuration limits the open voltage of pin 11 to ≈ 14.5 V. The horizontal output transistor at pin 11 is blocked until the current into pin 16 reaches a value of ≈ 5 mA. A higher current results in a horizontal output signal at pin 11, which starts with a duty factor of ≈ 40% HIGH. The duty factor is set by an internal current-source-loaded npn emitter follower stage connected to pin 14 during starting. When pin 16 changes over to voltage stabilization the npn emitter follower and current source load at pin 14 are switched OFF and the second phase detector circuit is activated, provided a horizontal flyback pulse is present at pin 12. When no flyback pulse is detected at pin 12 the duty factor of the horizontal output stage is set to 50%. The phase detector circuit at pin 14 compensates for storage time in the horizontal deflection output stage. The horizontal output pulse duration is 29 µs HIGH for storage times between 1 µs and 17 µs (flyback pulse of 12 µs). A higher storage time increases the HIGH time. Horizontal picture shift is possible by forcing an external charge or discharge current into the capacitor at pin 14. September 1990 9 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit TDA2579B Mute output and 50/60 Hz identification (pin 13) The collector of an npn transistor is connected to pin 13. When the voltage on pin 18 drops below 1.2 V (no TV-transmitter) the npn transistor is switched ON. When the voltage on pin 18 increases to a level of ≈ 1.8 V (new TV-transmitter found) the npn transistor is switched OFF. Pin 13 has also the possibility for 50/60 Hz identification. This function is available when pin 13 is connected to pin 10 (+ 12 V) via an external pull-up resistor of 10 to 20 kΩ. When no TV-transmitter is identified the voltage on pin 13 will be LOW (< 0.5 V). When a TV-transmitter with a divider ratio > 576 (50 Hz) is detected the output voltage of pin 13 is HIGH (+ 12 V). When a TV-transmitter with a divider ratio < 576 (60 Hz) is found an internal pnp transistor with its emitter connected to pin 13 will force this pin output voltage down to ≈ 7.6 V. Sandcastle output (pin 17) The sandcastle output pulse generated at pin 17, has three different voltage levels. The highest level, (10.4 V), can be used for burst gating and black level clamping. The second level (4.5 V) is obtained from the horizontal flyback pulse at pin 12, and is used for horizontal blanking. The third level (2.5 V) is used for vertical blanking and is derived via the vertical divider system. For 50 Hz the blanking pulse duration is 44 clock pulses and for 60 Hz it is 34 clock pulses started from the vertical divider reset. For TV-signals which have a divider ratio between 622 and 628 or between 522 and 528 the pulse is started at the first equalizing pulse. With the 50/60 Hz information the burst-key pulse width is switched to improve the behaviour in multi-norm concepts. September 1990 10 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit TDA2579B RATINGS Limiting values in accordance with Absolute Maximum System (IEC 134) PARAMETER SYMBOL MIN. MAX. UNIT Start current I16 − 9.7 mA Supply voltage V10 − 13.2 V Total power dissipation Ptot − 1.2 W Storage temperature range Tstg −55 + 150 °C Operating ambient temperature range Tamb −25 + 70 °C Rth j-a 50 K/W Thermal resistance From junction to ambient in free air September 1990 11 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit TDA2579B CHARACTERISTICS Tamb = 25 °C; I16 = 6.2 mA; V10 = 12 V; unless otherwise specified Voltage measurements are taken with respect to pin 9 (ground) PARAMETER CONDITIONS SYMBOL MIN. TYP. MAX. UNIT Supply Supply current (pin 16) V10 = 0 V I16 6.2 − 9.7 mA V10 = 10 V I16 2.5 − 9.7 mA Stabilized voltage (pin 16) V16 8.8 9.3 9.7 V Current consumption (pin 10) I10 − 70 85 mA Supply voltage range (pin 10) VP 10 12 13.2 V V5 1.5 3.1 3.75 V V5(p-p) 0.05 0.6 1.0 V 35 50 65 % 0.2 0.3 0.55 µs − 19 − dB − 3 − dB V5 − + 0.7 +1 V Holding range ∆f − ± 800 Catching range ∆f ± 700 ± 800 ± 1100 − 2 − Video input (pin 5) Top sync level Sync pulse amplitude (peak-to-peak value) Slicing level note 1 note 2 Delay between video input and detector output (see also Fig.3) Sync pulse noise level detector circuit active note 3 S/N Sync pulse Noise level detector circuit hysteresis Noise gate (pin 5) Switching level First control loop (pin 8) (horizontal oscillator to sync) Hz Control sensitivity video with respect to burst-key and flyback-pulse Slow time constant kHz/µs Normal time constant − 5 − kHz/µs Fast time constant − 3 − kHz/µs note 4 − 0.2 − µs/Vtt note 4 − 0.08 − µs/Vtt Phase modulation due to hum on the supply line (pin 10) Phase modulation due to hum on input current (pin 16) September 1990 12 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit PARAMETER CONDITIONS TDA2579B SYMBOL MIN. TYP. MAX. UNIT Second control loop (pin 14) (horizontal flyback to horizontal oscillator) Control sensitivity td = 10 µs Control range ∆ td / ∆ to 200 300 600 µs td 1 − >45 µs td 1 Control range for constant duty factor horizontal output 29 (−t flyback pulse) µs Controlled edge of horizontal output signal (pin 11) positive Phase adjustment (pin 14) (via second control loop) Control sensitivity td = 10 µs Maximum allowed control current Horizontal oscillator (pin 15) − 25 − µA/µs I14 − − ± 60 µA f − 15625 − Hz ∆f − − ±4 % ∆f − +5 +8 % TC − −1.10-4 − /K V11 − − 13.2 V V11 13 − 15.8 V I16 − 5.0 6.2 mA V11 − 0.1 0.5 V 50 60 70 % − 0.3 0.5 V C = 2.7 nF; Rosc = 34.8 kΩ Frequency (no sync) Spread (fixed external component, no sync) Frequency deviation between starting point output signal and stabilized condition Temperature coefficient Horizontal output (pin 11) (Open collector) Output voltage high Start voltage protection (internal zener diode) Low input current (pin 16) protection output enabled Output voltage low start condition I11 = 10 mA Duty factor output current during starting I16 = 6.2 mA Output voltage low normal condition I11 = 25 mA V11 Duty factor output current without flyback pulse (pin 12) Duration of the output pulse HIGH td = 10 µs Controlled edge September 1990 45 50 55 % 27 29 31 µs positive 13 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit PARAMETER CONDITIONS TDA2579B SYMBOL MIN. TYP. MAX. UNIT Temperature coefficient − −5.10-2 − µs/°C ∆HW/td − 0.16 − µs/µs burst-key V17 9.8 10.4 − V horizontal blanking V17 4.1 4.5 4.9 V IL = 0.3 mA V17 2.1 2.5 2.9 V Isink = 0.5 mA V17 − − 0.7 V burst-key (50 Hz) tp 3.85 4.15 4.6 µs burst-key (60 Hz) tp 3.40 3.65 4.0 µs V12 − 1.0 − V 2.3 2.7 3.1 µs (50 Hz) − 9.3 9.7 µs (60 Hz) − 8.8 9.2 µs I18 − 0.25 − mA V18 5.8 6.5 7.0 V V18 9 10 − V V18 − 0.3 − V V18 < 3.2 3.5 3.8 V V18 < 1.0 1.2 1.4 V V18 < 0.08 0.12 0.16 V horizontal output pulse Influence of delay time on pulse width of the horizontal output signal Sandcastle output signal (pin 17) IL = 1 mA Output voltage during: vertical blanking Zero level output voltage Pulse width: Horizontal blanking Vertical blanking note 5 Phase position burstkey time between middle sync pulse at pin 5 and start of burst pulse at pin 17 Time between start sync pulse and end of burst pulse at pin 17 Coincidence detector, video transmitter identification circuit and time constant switching levels (see also Fig.1) Detector output current Voltage level for in sync condition (ϕ1 normal) Voltage for noisy sync pulse (ϕ1 slow and gated) Voltage level for noise only note 6 Switching level normal to fast Switching level mute output active and fast to normal Switching level frame period counter (3 periods fast) September 1990 14 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit PARAMETER CONDITIONS TDA2579B SYMBOL MIN. TYP. MAX. UNIT Switching level: normal to fast (locking) V18 > 1.5 1.75 2.0 V V18 > 4.7 5.0 5.3 V V18 7.4 7.8 8.2 V I13 = 1 mA V13 − 0.15 0.32 V V13 < 1 V I13 − − 5 mA I13 − − 1 µA V13 7.2 7.65 8.1 V V13 − V10 − V Switching level V12 − +1 − V Input current I12 +0.2 − +3 mA Input pulse V12 − − 12 VP − 3.5 − kΩ td 2.1 2.5 2.9 µs Pulse width charge current − − 26 − clock pulses Charge current I3 − 3 − mA mute output inactive Switching level fast to normal (locking) Switching level normal to slow (gated sync pulse) Video transmitter identification output (pin 13) Output voltage active (no sync) Sink current active (no sync) Output current inactive (sync 50 Hz) 50/60 Hz identification (pin 13) (R13 positive supply 12 kΩ) Emitter follower, pnp: 60 Hz: 2 × f < 576 voltage H -------------fV 50 Hz: 2 × f H > 576 voltage -------------fV Flyback input pulse (pin 12) Input resistance Phase position without shift time between the middle of the sync pulse at pin 5 and the middle of the horizontal blanking pulse at pin 17 Vertical ramp generator (pin 3) Top level ramp signal voltage Divider in 50 Hz mode note 7 V3 5.5 5.85 6.3 V Divider in 60 Hz mode note 7 V3 4.55 4.85 5.25 V September 1990 15 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit PARAMETER CONDITIONS TDA2579B SYMBOL MIN. TYP. MAX. UNIT Ramp amplitude C3 = 150 nF, R4 = 330 kΩ 50 Hz note 7 − 3.1 − VP R4 = 330 kΩ 60 Hz note 7 − 2.5 − VP Temperature coefficient I4 = 30 µA I3 − + 100 − 10-6 /K I4 = 20 µA V4 7.0 7.5 7.9 V I4 10 − 75 µA TC − + 50 − 10-6 /K V2 0.97 1.07 1.17 V V2 − 0.8 − VP − 1.75 2.5 % Current source (pin 4) Output voltage Allowed current range Temperature coefficient output voltage Comparator (pin 2) I4 = 30 µA C3 = 150 nF; R4 = 330 kΩ Input voltage DC level note 7 AC level Deviation amplitude 50/60 Hz Vertical output stage (pin 1) (npn emitter follower) Output voltage Io pin 1 = +1.5 mA note 7 V1 5.0 5.5 6.3 V Rs, sync separator resistor − 170 − Ω Continuous sink current − 0.25 − mA Vertical guard circuit (pin 2) Active (V17 = 2.5 V) Switching level LOW note 7 V2 > 1.7 1.85 2.0 V Switching level HIGH note 7 V2 < 0.25 0.35 0.45 V Notes 1. Up to 1 V peak-to-peak the slicing level is constant, at amplitudes exceeding 1 V peak-to-peak the slicing level will increase. 2. The slicing level is fixed by the formula: Rs P = --------------------- × 100% ( R s value in kΩ ) 5.3 + R s 3. video voltage black to white (p-p) S ⁄ N = 20 log --------------------------------------------------------------------------------------noise ( rms ) measured with 1 Vp-p video input 4. Measured between pin 5 and sandcastle output pin 17. September 1990 16 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit TDA2579B 5. Divider in search (large) mode: start: reset divider = start vertical sync plus 1 clock pulse stop: 2 × fH n = -------------- > 576 clock pulse 44 fV 2 × fH n = -------------- < 576 clock pulse 34 fV Divider in small window mode: start: clock pulse 517 (60 Hz) clock pulse 618 (50 Hz) stop: clock pulse 34 (60 Hz) clock pulse 44 (50 Hz) 6. Depends on DC level of pin 5, given value is valid for V5 ≈ 5 V. 7. Value related to internal zener diode reference voltage source spread includes the complete spread of reference voltage. September 1990 17 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit Fig.3 Timing diagram of the TDA2579B. September 1990 18 TDA2579B Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit APPLICATION INFORMATION Fig.4 TDA2579B 110° application circuit (45AX). September 1990 19 TDA2579B Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit TDA2579B PACKAGE OUTLINE DIP18: plastic dual in-line package; 18 leads (300 mil) SOT102-1 ME seating plane D A2 A A1 L c e Z w M b1 (e 1) b b2 MH 10 18 pin 1 index E 1 9 0 5 10 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 min. A2 max. b b1 b2 c D (1) E (1) e e1 L ME MH w Z (1) max. mm 4.7 0.51 3.7 1.40 1.14 0.53 0.38 1.40 1.14 0.32 0.23 21.8 21.4 6.48 6.20 2.54 7.62 3.9 3.4 8.25 7.80 9.5 8.3 0.254 0.85 inches 0.19 0.020 0.15 0.055 0.044 0.021 0.015 0.055 0.044 0.013 0.009 0.86 0.84 0.26 0.24 0.10 0.30 0.15 0.13 0.32 0.31 0.37 0.33 0.01 0.033 Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION REFERENCES IEC JEDEC EIAJ ISSUE DATE 93-10-14 95-01-23 SOT102-1 September 1990 EUROPEAN PROJECTION 20 Philips Semiconductors Preliminary specification Horizontal/vertical synchronization circuit TDA2579B SOLDERING Introduction There is no soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. However, wave soldering is not always suitable for surface mounted ICs, or for printed-circuits with high population densities. In these situations reflow soldering is often used. This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in our “IC Package Databook” (order code 9398 652 90011). Soldering by dipping or by wave The maximum permissible temperature of the solder is 260 °C; solder at this temperature must not be in contact with the joint for more than 5 seconds. The total contact time of successive solder waves must not exceed 5 seconds. The device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified maximum storage temperature (Tstg max). If the printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit. Repairing soldered joints Apply a low voltage soldering iron (less than 24 V) to the lead(s) of the package, below the seating plane or not more than 2 mm above it. If the temperature of the soldering iron bit is less than 300 °C it may remain in contact for up to 10 seconds. If the bit temperature is between 300 and 400 °C, contact may be up to 5 seconds. DEFINITIONS Data sheet status Objective specification This data sheet contains target or goal specifications for product development. Preliminary specification This data sheet contains preliminary data; supplementary data may be published later. Product specification This data sheet contains final product specifications. Limiting values Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. September 1990 21