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SAA4961:
The SAA4961 is an adaptive alignment-free one chip comb filter compatible with both PAL and NTSC systems and provides high
performance in Y/C separation.
Features:
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One chip adaptive multi-standard comb filter
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Time discrete but continuous amplitude signal processing with analogue interfaces
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Internal delay lines, filters, clock processing and signal switches
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Alignment-free
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No hanging dots or residual cross colour on vertical transients
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Few external components
It is possible to switch the comb filter into one of the following 3 modes:
1. Comb mode
: In this mode, luminance and chrominance comb filter function are active.
Chrominance output pin (pin 12) outputs comb filtered chrominance signal, luminance output pin (pin 14)
outputs comb filtered luminance signal and CVBS output pin (pin 15) outputs delay compensated CVBS signal.
2. Comboff mode
: In this mode, luminance comb filter function is turned off, but chrominance comb filter function operates.
Chrominance output pin (pin 12) outputs comb filtered chrominance signal, luminance output pin (pin 14) outputs
delay compensated CVBS signal and CVBS output pin (pin 15) outputs delay compensated CVBS signal.
3. Bypass mode
: In this mode, no IC-function is active. Cext is bypassed to chrominance output pin (pin 12) and Yext/CVBS
is bypassed to luminance output pin (pin 14) and CVBS output pin (pin 15).
PINNING
PIN VALUE
1. Subcarrier frequency input
: 200mVpp, Min : 100mVpp, Max : 400mVpp
2. Internal connected
3. Bypass mode forcing
: HIGH level input voltage Min : 2.4VDC, Max : Vcc
4. Internal connected
5. Decoupling capacitor
: 1.25VDC, Min : 1.1VDC, Max : 1.4VDC
6. Internal connected
7. Analogue supply voltage
: 5VDC, Min : 4.75VDC, Max : 5.5VDC
8. Analogue supply voltage output buffer
: 5VDC, Min : 4.75VDC, Max : 5.5VDC
9. Analogue ground
10. External chrominance input
: 0.7Vpp, Max : 1Vpp
11. Analogue ground output buffer
12. Chrominance output signal
: 0mV, Min : -400mV, (DC offset voltage related to input) Max : +400mV
BYPASS-mode:Co/Cext : 0dB, Min : -1dB, Max : +1dB
13. fsc reference selection
: HIGH level input voltage Min : 2V, Max : Vcc
: Low level input voltage Min : 0V, Max : 0.8V
14. Luminance output signal
: 1Vpp, Min : 0.6Vpp, Max : 1.54Vpp
15. CVBS and Y output signal
: 1Vpp, Min : 0.6Vpp, Max : 1.54Vpp
16. Internal connected
17. CVBS and Y input signal
: 1Vpp, Min : 0.7Vpp, Max : 1.4Vpp
18. Disable prefilter
: HIGH level input voltage Min : 2.0VDC, Max : Vcc
LOW level input voltage Min : 0VDC, Max : 0.8VDC
19. Storage Capacitor
: 2.5VDC, Min : 1.8VDC, Max : Vcc
20. Standard select 1
: HIGH level input voltage Min : 2.0VDC, Max : Vcc
LOW level input voltage Min : 0VDC, Max : 0.8VDC
21. Digital ground
22. Digital supply voltage
: 5VDC, Min : 4.75VDC, Max : 5.5VDC
23. Standard select 2
: HIGH level input voltage Min : 2.0VDC, Max : Vcc
LOW level input voltage Min : 0VDC, Max : 0.8VDC
24. Decoupling capacitor
: 1.25VDC, Min : 1.1VDC, Max : 1.4VDC
25. Controlling I/O pin
: HIGH level input voltage Min : 2.4VDC, Max : Vcc
LOW level input voltage
Min : 0VDC, Max : 1.5VDC
26. Analogue ground PLL
27. Analogue supply voltage PLL
: 5VDC, Min : 4.75VDC, Max : 5.5VDC
28. Internal connected
MC44604:
General description:
The MC44604 is an enhanced high performance controller that is specifically designed for off-line and DC-to-DC converter applications.
It offers a really safe and reliable power management thanks particularly to its protection features (foldback, overvoltage detection,
soft start, accurate demagnetization detection). Its high current totem pole output is also ideally suited for driving a power
MOSFET, but can also be used for driving a bipolar transistor in low power converters. In addition to these features,
the MC44604 offers an efficient stand-by mode.
Features:
Current Mode Controller
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Operation up to 250 kHz Output Switching Frequency
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Inherent Feed Forward Compensation
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Latching PWM for Cycle-by-Cycle Current Limiting
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Oscillator with Precise Frequency Control
High Flexibility
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Externally Programmable Reference Current
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Secondary or Primary Sensing
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High Current Totem Pole Output
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Undervoltage Lockout with Hysteresis
