Video ICs Equalizer and ATF circuit IC for Digital VCRs BH7273KV The BH7273KV is an equalizer and ATF circuit IC developed for use with digital video cassettes (DVC). By using this IC, it is simple to design the filter for the equalizer required for DVD sets. In addition, the ATF circuit detects the pilot signals and generates error signals. Applications •Equalizers and ATFs for digital VCRs •1)Features Enables the configuring of all pass filters, 1 + D circuits, and transversal filters (TVF). 2) Built-in VCA, amplifier, buffer, and mixer amplifier. 3) Detects the ATF pilot signal and generates an ATF error signal. 4) Built-in 1.5MHz LPF, VCA, 465kHz BPF, 697.5kHz BPF, 25dB amplifier, peak detector, and subtractor. 5) Intermediate frequencies are variable by controlling the voltages for the 465kHz BPF and 697.5kHz BPF. •Absolute maximum ratings (Ta = 25°C) Parameter Symbol VCC Applied voltage Power dissipation Limits Unit 7.0 V ∗ 1000 Pd mW Operating temperature Topr – 20 ~ + 65 °C Storage temperature Tstg – 55 ~ + 125 °C ∗ When mounted on a 70mm × 70mm × 1.6mm glass epoxy board. ∗ Reduced by 10.0mW for each increase in Ta of 1°C over 25°C. •Recommended operating conditions (Ta = 25°C) Parameter Power supply voltage Symbol Min. Typ. Max. Unit VCC 5V 4.6 4.9 5.2 V Conditions 2, 15, 21, 33, 44, 48, 60pin 䊊Not designed for radiation resistance. 1 Video ICs BH7273KV MIX + OUT MIX – OUT MIX IN2 MIX IN1 GND Vcc 4.9V 44 GND Vcc 4.9V 45 N.C. F1 DET OUT 46 OFFSET BIAS F2 DET OUT 47 OFFSET BIAS OUT GND 48 SUBSTRACT OUT Vcc 4.9V •Block diagram 43 42 41 40 39 38 37 36 35 34 33 32 N.C. 31 N.C. 30 N.C. 29 N.C. 53 28 BF OUT2 54 27 BF OUT1 26 BF IN 25 GND 24 TVF2AMP OUT 23 TVF2AMP – IN F1 AMP OUT 50 F2 AMP OUT 51 F2 AMP IN 52 F1 AMP IN F1 BPF OUT SUBTRACT DET 49 DET N.C. Mix 47k 47k AMP 25dB AMP BF BF F2 BPF OUT 55 F2 adj 56 F1 adj 57 GCA OUT 58 GND 59 22 TVF2AMP + IN Vcc 4.9V 60 21 Vcc 4.9V GAIN adj 61 20 GND GAIN SW 62 19 TVF1AMP OUT ATF IN 63 18 TVF1AMP – IN GND 64 17 TVF1AMP + IN 697.5kHz BPF BH7273KV 465.0kHz BPF AMP 14 / 24dB VCA VCA AMP 1.5MHz LPF AMP 6 7 8 9 10 11 Vcc 4.9V BIAS FILTER BF2 IN BF2 OUT APF1AMP + IN APF1AMP – IN APF1AMP OUT DRIVER IN DRIVER OUT GND 12 13 14 15 16 GND 5 Vcc 4.9V 4 TVF1VCA OUT 3 TVF1CTRL 2 TVF1VCA + IN 1 SLEEP CTRL CTRL •Vcc-GND pin table Pin No. Pin name 2 11 VCC 4.9V GND All pass filter for pins 3 to 10 Same as above Function 15 16 VCC 4.9V GND 12-14pin VCA, 17-19pin AMP Same as above 21 20 25 VCC 4.9V GND GND 22-24pin AMP, 26-28pin BUFF 22-24pin AMP 26-28pin BUFF 33 34 VCC 4.9V GND 35-38pin MIX AMP 35-38pin MIX AMP 44 39 VCC 4.9V GND Detector, subtractor circuit Same as above 48 47 VCC 4.9V GND BPF, 25dBAMP Same as above 60 59 VCC 4.9V GND LPF, GCA Same as above 64 GND N.C. (Connected to GND to lower impedance) ∗ Make sure that Vcc and GND do not sway. ∗ Separate the equalizer and ATF grounds. ∗ Since the gain of the ATF circuit is high, make sure that there is no return from the output to input. 2 Video ICs BH7273KV •Electrical characteristics (unless otherwise noted, Ta = 25°C, V CC Parameter = 4.9V, f = 4.0MHz) Symbol Min. Typ. Max. Unit Quiescent current Iq — 63 100 mA No signal Quiescent current Iq(S) — 16 30 mA No signal, sleep mode GVA – 3.0 ± 0.0 + 3.0 dB Input at pin 4 = 300mVP-P Measure output at pin 10 ∆GVA – 3.0 ± 0.0 — dB f = 8.0 / 1.0MHz, VIN = 300mVP-P Output level difference for pin 10 Voltage gain GVV1 – 1.0 2.0 — dB Input at pin 12 = 150mVP-P, pin 13 = 3.0V Measure output at pin 14 Voltage gain GVV2 — – 28.0 dB Input at pin 12 = 150mVP-P, pin 13 = 0.25V Measure output at pin 14 Frequency characteristics ∆GVV – 3.0 ± 0.0 — dB f = 8.0 / 1.0MHz, VIN = 150mVP-P Output level difference for pin 14; pin 13 = 3.0V 3.9 6.9 9.9 dB Input at pins 17, 18, 22, and 23 = 150mVP-P Measure output at pins 19 and 24 ∆GVT – 3.0 ± 0.0 — dB f = 8.0 / 1.0MHz, VIN = 150mVP-P Output level difference for pins 19 and 24 GVB – 4.2 – 1.2 — dB Input at pin 26 = 300mVP-P Measure output at pins 27 and 28 ∆GVB – 3.0 ± 0.0 — dB f = 8.0 / 1.0MHz, VIN = 300mVP-P Output level difference for pins 27 and 28 GVM 5.0 8.0 11.0 dB Input at pins 35 and 36 = 150mVP-P Measure output at pins 37 and 38 ∆GVM – 3.0 0.0 — dB f = 8.0 / 1.0MHz, VIN = 150mVP-P Output level difference for pins 37 and 38 VCA voltage gain 1 GVF1 11 14 17 dB Input at pin 63 = 2.0mVP-P, pin 62 = low Measure output at pin 58, f = 697.5kHz VCA voltage gain 2 GVF2 21 24 27 dB Input at pin 63 = 2.0mVP-P, pin 62 = high Measure output at pin 58, f = 697.5kHz 465.0kHz BPF voltage gain GVB1 44 48 52 dB Input at pin 63 = 0.3mVP-P, pin 62 = high Measure output at pin 50, f = 465.0kHz 697.5kHz BPF voltage gain GVB2 44 48 52 dB Input at pin 63 = 0.3mVP-P, pin 62 = high Measure output at pin 51, f = 697.5kHz ATF OUT output level 1 VATF1 1.30 1.50 1.70 V No signal Conditions [Equalizer block] 〈All pass filter〉 Voltage gain Frequency characteristics 〈VCA〉 – 12.0 〈TVF AMP〉 Voltage gain Frequency characteristics GVT 〈BUFF AMP〉 Voltage gain Frequency characteristics 〈MIX AMP〉 Voltage gain Frequency characteristics [ATF block] ATF OUT output level 2 VATF2 1.50 1.80 2.10 V 50pin = 100mVP-P 51pin = 300mVP-P, 41pin = 1.5V ATF OUT output level 3 VATF3 0.60 0.90 1.20 V 50pin = 500mVP-P 51pin = 100mVP-P, 41pin = 1.5V SLEEP hold voltage VTH1H 2.0 — 4.9 V Pin 1 voltage for SLEEP mode SLEEP hold voltage VTH1L 0.0 — 1.0 V Pin 1 voltage for SLEEP mode VCA gain switch low VTH62L 0.0 — 1.0 V Pin 62 voltage for ATF VCA gain to be low VCA gain switch high VTH62H 2.0 — 4.9 V Pin 62 voltage for ATF VCA gain to be high [Logic block] 3 MIX IN MIX OUT Offset BIAS 1000p∗ ATF OUT 1000p∗ Vcc 4.9V Vcc 4.9V •Measurement circuit Vcc 4.9V 0.1µ 2.2k 0.1µ 0.1µ 48 47 46 45 44 697.5kHz BPF OUT 42 41 40 39 38 37 0.1µ 36 35 34 33 32 DET DET 50 MIX 31 47k 47k 51 52 0.1µ 43 SUBTRACT 49 465.0kHz BPF OUT MIX IN BH7273KV MIX OUT Video ICs 30 29 AMP 25dB AMP 300 53 28 54 27 BUFF OUT 0.1µ 300 0.1µ BF 55 BF 26 BUFF OUT 0.1µ BUFF IN 0.1µ f2 adj 25 697.5kHz BPF 56 BH7273KV f1 adj TVF AMP OUT 24 465.0kHz BPF 57 AMP 58 ATF VCA OUT 23 59 22 60 21 0.1µ 600 TVF AMP IN 0.1µ TVF AMP IN 0.1µ Vcc 4.9V Vcc 4.9V Gain adj 61 20 14 / 24dB VCA Gain SW TVF AMP OUT 19 62 600 VCA ATF IN 63 AMP 1.5MHz LPF 18 AMP 0.1µ 64 17 CTRL 1 2 3 4 5 6 7 8 9 0.1µ SLEEP 10 11 12 13 14 15 0.1µ 47p 1k Vcc 4.9V 33p Vcc 4.9V 600 470 0.1µ APF IN 300 0.1µ APF OUT Fig. 1 4 0.1µ VCA IN VCA OUT 16 0.1µ 0.1µ TVF AMP IN TVF AMP IN Video ICs BH7273KV •Input / output circuits Pin No. Pin name Pin voltage Internal circuit Function 1 35k 15k 1 SLEEP CTRL 0.0 15k Sleep control 100k 2 VCC 5V — — 3 BIAS FILTER 2.2 20k VCC for all pass filter of pins 3 to10 21k Filter for BF amplifier bias of pins 4 and 5 3 22k 4 5 BF2 IN BF2 OUT 3.0 2.2 6 7 APF1 AMP + IN APF1 AMP – IN — — 4 5k 5 6 7 Buffer amplifier input Buffer amplifier output APF amplifier positive input APF amplifier negative input 150 8 APF1 AMP OUT APF amplifier output — 8 9 10 DRIVER IN DRIVER OUT — — 9 10 Driver input Driver output 5 Video ICs BH7273KV Pin No. Pin name Pin voltage Internal circuit 11 GND — — Function GND for all pass filter of pins 3 to 10 12 12 TVF1 VCA + IN 1k 2.2 5k 13 13 TVF1 CTRL 0.0 TVF1 VCA positive input 5k 15k TVF1 VCA gain control 5k 400 400 TVF1 VCA positive output 14 TVF1 VCA OUT 1.7 15 VCC 5V — — VCC for VCA of pins 12 to 14 and for amplifier of pins 17 to 19 16 GND — — GND for VCA of pins 12 to 14 and for amplifier of pins 17 to 19 14 17 17 18 6 TVF1 AMP + IN TVF1 AMP – IN 2.2 2.2 18 400 5k 5k TVF1 amplifier positive input TVF1 amplifier negative input Video ICs BH7273KV Pin No. Pin name Pin voltage Internal circuit 19 TVF1 AMP OUT 2.7 20 GND — — GND for amplifier of pins 22 to 24 21 VCC 5V — — VCC for amplifier of pins 22 to 24 and for BF of pins 26 to 28 TVF1 amplifier output 19 22 22 23 TVF2 AMP + IN TVF2 AMP – IN 2.2 2.2 24 TVF2 AMP OUT 2.7 25 GND — 26 27 28 BF IN BF OUT1 BF OUT2 2.1 1.3 1.3 23 TVF2 amplifier positive input TVF2 amplifier negative input 400 5k 5k TVF2 amplifier output 24 GND for BF of pins 26 to 28 — 26 5k Function 27 28 BF input BF output 1 BF output 2 7 Video ICs 8 BH7273KV Pin No. Pin name Pin voltage Internal circuit Function 29 30 31 32 N.C. — — — 33 VCC 5V — — VCC for VCA of pins 30 to 32 and MIX amplifier of pins 35 to 38 34 GND — — 35 36 MIX IN1 MIX IN2 2.2 2.2 37 38 MIX – OUT MIX + OUT 3.2 3.2 39 GND — — GND for detector, subtractor, and reverse polarity circuits 40 N.C. — — — 35 GND for MIX amplifier of pins 35 to 38 36 5k MIX amplifier input 1 MIX amplifier input 2 5k — 37 38 MIX amplifier output 1 MIX amplifier output 2 Video ICs BH7273KV Pin No. Pin name Pin voltage 41 OFFSET BIAS 1.5 Internal circuit 35k Function 14k Bias adjustment 41 15k 4k 42 OFFSET BIAS OUT 2.5 Bias output 42 1k 43 SUBTRACT OUT — ATF output 43 1k 44 VCC 5V — 45 46 F1DET OUT F2DET OUT — — VCC for detector, subtractor, and reverse polarity circuits — 15k 45 15k F1 detector F2 detector 46 47k 47k 47 GND — — GND for BPF and 25dB amplifier 48 VCC 5V — — VCC for BPF and 25dB amplifier 9 Video ICs BH7273KV Pin No. Pin name Pin voltage Internal circuit Function 49 N.C. — — — 50 51 F1AMP – OUT F2AMP – OUT 2.1 2.1 50 52 52 53 F2AMP IN F1AMP IN 2.3 2.3 54 55 F1BPF OUT F2BPF OUT 2.5 2.5 56 F2 ADJ 1.5 F1 amplifier output F2 amplifier output 51 53 200 200 5k 5k 54 70k 55 F2 amplifier input F1 amplifier input F1 BPF output F2 BPF output 35k F2 adjustment 35k F1 adjustment 56 30k 57 F1 ADJ 1.5 70k 57 30k 58 10 GCA OUT 1.8 58 VCA output Video ICs BH7273KV Pin No. Pin name Pin voltage Internal circuit Function 59 GND — — GND for LPF and VCA 60 VCC 5V — — VCC for LPF and VCA 61 GAIN ADJ 1.5 35k 70k VCA gain adjustment 61 30k 1k 62 35k 15k 62 GAIN SW 1k VCA gain switching 0.0 15k 100k 63 63 LPF IN 3.8 64 N.C. — LPF input 5k — N.C. pin Connect to ground to lower impedance 11 Video ICs BH7273KV •Application example Delay Line EQ – OUT EQ + OUT Offset BIAS 1000p∗ ATF OUT 1000p∗ Vcc 4.9V Vcc 4.9V 150 150 180 150 Vcc 4.9V 0.1µ 2.2k 0.1µ 0.1µ 48 47 46 45 44 42 41 40 39 38 37 0.1µ 36 35 34 33 32 SUBTRACT 50 DET DET 49 MIX 31 47k 47k 51 52 0.1µ 43 30 29 AMP 25dB AMP 53 28 0.1µ 54 27 0.1µ 0.1µ BF 55 BF 26 0.1µ f2 adj 25 697.5kHz BPF 56 BH7273KV f1 adj 24 465.0kHz BPF 57 AMP 58 23 22 60 21 0.1µ Vcc 4.9V Vcc 4.9V Gain adj 61 20 14 / 24dB VCA Gain SW 0.1µ 19 62 300 VCA ATF IN 63 AMP 1.5MHz LPF 18 0.1µ AMP 0.1µ 64 17 CTRL 0.1µ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0.1µ SLEEP 47p 1k Vcc 4.9V Vcc 4.9V 33p 0.1µ 0.1µ 470 0.1µ Delay Line 300 300 300 EQ IN Fig. 2 12 Delay Line 0.1µ 59 16 300 Video ICs BH7273KV •External dimensions (Units: mm) 12.0 ± 0.3 10.0 ± 0.2 32 17 64 1.4 ± 0.1 1 0.10 33 0.5 16 0.5 12.0 ± 0.3 10.0 ± 0.2 48 49 0.125 ± 0.1 0.2 ± 0.1 0.1 VQFP64 13