ILA4661 BASEBAND DELAY LINE GENERAL DESCRIPTION The ILA4661 is an integrated baseband delay line circuit with one line delay. It is suitable for decoders with colour-difference signal outputs ± (R-Y) and ± (B-Y). Device is functionally identical to the TDA4661 Philips. FEATURES • Two comb filters, using the switched-capacitor technique, for one line delay time (64 µS) • 3 MHz internal clock signal derived from a 6 MHz CCO, line-locked by the sandcastle pulse (64 µS line) • Comb filtering functions for NTSC colour-difference signals to suppress cross-colour • Clamping of AC-coupled input signals ± (R-Y) and ± (B-Y) QUICK REFERENCE DATA Parameter Symbol Analogy supply current, mA Digital supply current, mA Input fixing voltage (on pins 14 and 16), V Output voltage (on pins 11 and 12), V Output signal (peak-to peak value) ± (R-Y) on pin 11 ± (B-Y) on pin 12 Ratio of output amplitudes at equal input signals (U14=U16=1.33V), dB Ratio of output signals on pins 11 and 12 for adjacent time samples at constant input signals (U14=U16=1.33V), dB Gain for PAL and NTSC Gain for SECAM (ratio UO/UI), dB Delay of delayed signals, µS Delay of non-delayed signals, nS Transient time of delayed signal on pins 11 respectively 12, nS Transient time of non-delayed signal on pins 11 respectively 12, nS Noise voltage (RMS value; pins 11 and 12), mV Weighted signal-to-noise ratio, dB 1 Ip1 Ip2 U14,16 U11,12 Min. 1.3 2.5 Type UVCC=5.0 V Type - Max 6.0 1.0 1.7 3.3 U011 U012 - 1.05 1.33 - U11/U12 -0.4 - 0.4 Un/Un+1 -0.1 - 0.1 Gv td tdn 5.3 -0.6 63.94 40 - 6.3 0.4 64.06 80 ttr - 350 - ttrn Un S/N(w) - 320 54 1.2 - ILA4661 PIN CONFIGURATION 16 15 14 13 UI(R-Y) n.c. UI(B-Y) n.c. 12 11 UO(B-Y) UO(R-Y) 10 9 GND1 UP1 ILA4661 UP2 n.c. GND2 i.c. SAND n.c. i.c. i.c. 1 2 3 4 5 6 7 8 BLOCK DIAGRAM ±(R-Y) 16 SIGNAL CLAMPING SAMPLEANDHOLD LINE MEMORY LP sandcastle pulse input 14 5 SIGNAL CLAMPING SANDCASTLE DETECTOR SAMPLEANDHOLD LINE MEMORY FREQUENCY PHASE DETECTOR addition stages pre-amplifiers ±(B-Y) + LP 1 Vp2 3 GND2 11 ±(R-Y) 12 ±(B-Y) 7 i.c. 13 n.c. 2 n.c. 6 n.c. 15 n.c. output stages + 3 MHz DIVIDER BY 192 LP CCO 6 MHz DIVIDER BY 2 9 10 4 8 Vp GND1 Test Test 2