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| TECHNICAL DATA SECAM decoder FEATURES *Fully integrated filters *Alignment free *For use with baseband delay KKA8395N GENERAL DESCRIPTION The KKA8395N is a self-calibrating, fully integrated SECAM decoder. The IC should preferably be used in conjunction with the PAL/NTSC decoder KKA8362ANS (TDA8362A) or TDA8366 and with the switched capacitor baseband delay circuit ILA4661 (TDA4661, TDA4660). The IC incorporates HF and LF filters, a demodulator and an identification circuit (luminance is not processed in this IC). The IC needs no adjustments and very few external components are required. A highly stable reference frequency is required for calibration and a two-level sandcastle pulse for blanking and burst gating. 16 1 8 ORDERING INFORMATION KKA8395N DIP TA = -40 to 125C QUICK REFERENCE DATA SYMBOL Vp V16(p-p) Tstg Tamb PARAMETER Positive supply voitage; pin 3 Composite video input voltage (peak -to- peak value); pin 16 Storage temperature range Operation ambient temperature range MIN. MAX. UNIT 7.2 -25 -25 8.8 1.5 +150 +70 V V C C 1 KKA8395N Fig.1 Block diagram. 2 KKA8395N FUNCTIONAL DESCRIPTION The KKA8395N is a self-calibrating SECAM decoder designed for use with a baseband delay circuit. During frame retrace a 4.433619 MHz reference frequency is used to calibrate the filters and the demodulator. The reference frequency should be very stable during this period. The Cloche filter is a gyrator-capacitor type filter the resonance frequency of which is controlled during the calibration period and offset during scan; this ensures the correct frequency during calibration. The demodulator is a Phase-Locked Loop (PLL) type demodulator which uses the frequency reference and the bandgap reference to force the PLL to the required demodulation characteristic. The low frequency de-emphasis is matched to the PLL and is controlled by the tuning voltage of the PLL. A digital identification circuit scans the incoming signal for SECAM (only line-identification is implemented). The identification circuit needs to communicate with the KKA8362ANS to guarantee that the output signal from the decoder is only available when no PAL signal has been identified. If a SECAM signal is decoded a request for colour-on is transmitted to pin 1 (current is sunk). If the signal request is granted (i.e. pin 1 is HIGH therefore no PAL) the colour difference outputs ((BY) and (RY)) from the KKA8362 are high impedance and the output signals from the KKA8395N are switched ON. If no SECAM signal is decoded during a two-frame period the demodulator will be initialized before another attempt is made also during a two-frame period. The CD outputs will be blanked or high-impedance depending on the logic level at pin 1. A two-level sandcastle pulse generates the required blanking periods and, also, clocks the digital identification pulse on the falling edge of the burst gate pulse. To enable the calibration period to be defined the vertical retrace is discriminated from the horizontal retrace, this is achieved by measuring the width of the blanking period. APPLICATION INFORMATION The leakage current at pin 8 should be well below 20 nA to meet the specification of the black levels (C8 = 220 nF). The leakage current at pin 7 should be well below 60 nA to meet the specification of the Cloche resonance frequency (C7 = 100 nF). The capacitors C7 and C8 should be connected to the ground pin as close as possible to the package. If not, this can result in a black level error for both channels. TEST INFORMATION The performance of the Cloche filter can be measured at pin 2. The use of a FET-probe is advised for low capacitive loading. 3 KKA8395N CHARACTERISTICS VP = 8.0 V; Tamb = 25 C; unless otherwise specified SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Supply (pin 3) Vp positive supply voltage Ip supply current Ptot Total power dissipation CVBS input (pin 10) composite video input voltage V16(p-p) (peak to peak value) chrominance video input V16(p-p) voltage (peak to peak value) Z1 Input impedance CLOCHE (pin 7) Vtd tuning voltage; pin 7 f0 resonance frequency B bandwidth Demodulator Vtd tuning voltage; pin 8 V0(p-p) V0(p-p) NLE -(B-Y) /(R-Y) Fbe-(R-Y) Fbe-(B-Y) Vo Bo S/N fp fp/fo Vrh(p-p) Zo(e) Zo(d) non-lineanty error ratio of -(B-Y) and -(R-Y) black level error - (R-Y) black level error - (B-Y) Output voltage levelduring blanking Output bankwidth signal-to-noise ratio pole-frequency LF deemphasis ratio of pole and zero frequency residual harmonic voltage (peak to peak value) output impedance SECAM enabled output impedance SECAM disabled 7.2 Note 1 Note 2 15 2.5 4.266 241 3.5 0.97 1.23 1.23 Note 6 40 77 Pin 1 HIGH Pin 1 LOW 1 1.0 3.5 8.5 Note 7 0.20 8.0 18 144 1.0 15 3.5 4.286 268 1.05 1.33 1.27 2.8 1.3 85 3 1.25 3.85 9.0 4.4336 - 8.8 25 220 1.5 300 4.5 4.306 295 4.8 1.13 1.43 3 1.32 5 7 93 10 600 1.5 4.2 9.5 0.50 V mA mV V mV k V MHz kHz V V V % kHz kHz V MHz dB kHz mV Note 3 100/75 color bar 100/75 color bar 100/75 color bar note 4 Note 5 Note 5 M V V s Sandcastle pulse Vbl blanking detection level Vb0 burst gate detection level falling edge of burst gate to tf start syne Reference/communication fref reference frequency reference voltage amplitude Vref(p-p) (peak to peak value) MHz V 4 KKA8395N SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Ved Vdd Is Identification ti H SECAM enable detection level; pin 1 SECAM disabled detection level; pin 1 sink current at SECAM identification; pin 1 Identification time colour on/off hysteresis Note 8 Note 9 1.5 3 2.8 2.0 150 4 - 3.3 - V V A frames dB Notes to the characteristics 1.If measured in the burst-period of a blue line. 2.The video input is AC-coupled. 3.During scan. 4. Measured as 100% x (IVuI - IVII) / (IVuI + IVlI); see Fig.3. 5. Converted to input frequency error. 6. Defined as the ratio between the peak-to-peak value of the B-Y component of the demodulated 100/75 colour bar and the peak-to-peak value of the noise. 7. The reference should be stable during frame blanking. 8. The SECAM enable and disable timing should preferably be at the end of the frame blanking. 9. The externally supplied voltage should exceed 0.5 V. 5 KKA8395N 6 KKA8395N SANDD CVBS 16 15 14 13 12 11 10 09 -(B-Y) OUTPUT -(R-Y) OUTPUT KKA8395 01 fref/IDENT 02 03 V p+ 04 05 06 07 08 100n 220n N SUFFIX PLASTIC DIP (MS - 001BB) A Dimension, mm 16 9 B 1 8 Symbol A B C MIN 18.67 6.1 MAX 19.69 7.11 5.33 F L D F 0.36 1.14 2.54 7.62 0 2.92 7.62 0.2 0.38 0.56 1.78 C -T- SEATING N G D 0.25 (0.010) M T K PLANE G H H J M J K L M N 10 3.81 8.26 0.36 NOTES: 1. Dimensions "A", "B" do not include mold flash or protrusions. Maximum mold flash or protrusions 0.25 mm (0.010) per side. 7 |
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