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| Video ICs Two-channel VCR PRE / REC amplifier for Digital VCRs BH7272KV The BH7272KV is a head amplifier developed for use in digital video cassette recorders. Both PB and REC have excellent frequency characteristics making this IC an ideal choice for digital recording and playback. The small VQFP48 package facilitates compact design of portable equipment such as video cameras. *Applications recorders Digital video cassette *Features amplifier is a differential amplifier with 1) The playback an overall gain of 54dB (Typ.), and has low-noise transistors as the first stage. The feedback circuit is not included, so provide negative feedback for head peak damping, and positive feedback to cancel the input capacitance using external components. 2) The playback AGC amplifier has 10dB of control range. 3) The recording current amplifier is a BLT current amplifier. Use external components to construct the head peak damping circuit. 4) Recording limit amplifier is included. Recording AGC amplifier not included. 5) The signal system VCC is 4.9V, and the control system VCC is 3.0V. *Absolute maximum ratings (Ta = 25C) Parameter Applied voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 7.0 900 Unit V mW C C - 20 ~ + 65 - 55 ~ + 125 When mounted on a 70mm x 70mm x 1.6mm glass epoxy board. Reduced by 9.0mW for each increase in Ta of 1C over 25 . *Recommended operating conditions (Ta = 25C) Parameter Signal system Control system Symbol VCC 5V VCC 3V Min. 4.6 2.8 Typ. 4.9 3.0 Max. 5.2 3.2 Unit V V Conditions 14, 19, 38, 47pin 16pin Not designed for radiation resistance. 1 Video ICs BH7272KV *Block diagram PB AGC LEVEL ADJ PB AGC FILTER AGC DET GATE PB AGC DET IN PB SW B OUT PB SW A OUT PB AGC OUT PB AGC IN PB MUTE REC IN 25 GND 26 N.C. 34 36 35 33 32 31 30 29 28 27 GND 37 DET LIMIT 24 LIMIT LEVEL adj Vcc 4.9V 38 3rd AGC 23 LIMIT Vth adj PB 2nd OUT A 39 22 REC LIMIT - OUT PB 2nd OUT B 40 2nd VAMP 21 REC LIMIT + OUT PB 2nd IN A 41 20 GND PB 2nd IN B 42 BH7272KV Balance Balance 19 Vcc 4.9V PB SW - OUT 43 18 REC GATE PB SW + OUT 44 Bias BF 17 REC "H" HEAD SW CTRL 45 16 Vcc 3.0V PB "H" 46 IAMP IAMP PRE 1k 1k 10k 10k IAMP PRE IAMP 15 BIAS FILTER Vcc 4.9V 47 14 Vcc 4.9V REC BTL A I0adj 48 13 REC BTL B I0adj 1 REC FB + B 2 HEAD + B 3 HEAD - B 4 REC FB - B 5 GND 6 PB SW + OUT 7 PB SW - OUT 8 GND 9 REC FB - A 10 HEAD - A 11 HEAD + A 12 REC FB + A *VCC / GND pins Pin No. 14 8 19 20 26 38 37 47 5 16 Pin name VCC 4.9V GND VCC 4.9V GND GND VCC 4.9V GND VCC 4.9V GND VCC 3.0V REC current amplifier As above Bias, REC limiter amplifier Bias, control logic REC limiter amplifier PB amplifier, PB AGC, peak amplifier As above PB first-stage amplifier PB first-stage amplifier, REC current amplifier Control logic Function Make sure that the voltages at VCC and GND pins does not sway. Be especially careful of the VCC and GND for the first-stage amplifier. The playback system has high gain, so take care to ensure that the output does not find its way back to the input. 2 Video ICs BH7272KV *Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 4.9V, 3.0V and f = 4.0MHz) Parameter Playback system Sleep-mode circuit current Circuit current Voltage gain ch-1 Voltage gain ch-2 Voltage gain differential Frequency characteristics Crosstalk PB mute attenuation AGC output level AGC control sensitivity AGC frequency characteristics Recording system Circuit current Recording current level 1 Recording current level 2 REC frequency characteristics REC mute attenuation Logic system PB holding voltage PB holding voltage REC holding voltage REC holding voltage HSW holding voltage HSW holding voltage RECGATE holding voltage RECGATE holding voltage VTH46H VTH46L VTH17H VTH17L VTH45H VTH45L VTH18H VTH18L 2.0 0.0 2.0 0.0 2.0 0.0 2.0 0.0 -- -- -- -- -- -- -- -- 3.0 1.0 3.0 1.0 3.0 1.0 3.0 1.0 V V V V V V V V Pins 46 voltage to hold PB Pin 46 voltage to hold PB Pin 17 voltage to hold REC Pin 17 voltage to hold REC Pin 45 voltage to hold HSW Pin 45 voltage to hold HSW Pin 18 voltage to hold RECGATE Pin 18 voltage to hold RECGATE Iq (R) IOR1 IOR2 IOF MUR -- 14 14 - 3.0 -- 54 20 20 0.0 - 60 80 26 26 -- - 35 mA mAP-P mAP-P dB dBc No signal Pin 11 output measurement when pin 25 input is 0.3VP-P Pin 2 output measurement when pin 25 input is 0.3VP-P f = 8.0 / 1.0MHz, pin 25 input = 0.3VP-P Pins 2, 11 output level differential Iq (S) Iq (P) GVP1 GVP2 GVP GVf CTP MUP VAGC VAGC GVAF -- -- 50 50 - 1.5 - 3.0 -- -- 230 -- - 3.0 14 34 54 54 -- 0.0 - 46 - 57 280 0.2 0.0 30 56 58 58 + 1.5 -- - 35 - 35 330 2.0 -- mA mA dB dB dB dB dBc dBc mVP-P dB dB No signal No signal Pin 35 output measurement when pin 11 input is 0.3mVP-P Pin 35 output measurement when pin 2 input is 0.3mVP-P GVP = GVP1 - GVP2 Pin 35 output level differential when f = 8.0 / 1.0MHz and VIN = 0.3mVP-P Pin 35 output level differential when for pin 45: H / L Pin 35 output level differential when pin 33 goes from L to H and pin 2 input is 0.3mVP-P Pin 27 output measurement when pin 31 input is VIN = 300mVP-P Pin 27 output level differential when pin 31 input VIN = 150 to 600mVP-P Pin 27 output level differential when f = 8.0 / 1.0MHz and pin 31 input is VIN = 300mVP-P Symbol Min. Typ. Max. Unit Conditions Note: dBc: dB below carrier (used to express relative level from carrier reference for convenience sake) 3 Video ICs BH7272KV *Measurement circuit (playback system) AGC DET GATE 0.1 PB AGC OUT PB RF OUT PB RF OUT PB AGC IN MUTE 1000p 50k 5.1k 27 26 25 REC IN 36 35 34 33 32 0.1 31 30 29 28 37 DET LIMIT 24 LIMIT LEVEL adj Vcc 4.9V 38 3rd AGC 23 LIMIT Vth adj 39 22 40 2nd VAMP 21 41 0.1 0.1 42 20 BH7272KV Balance Balance 19 Vcc 4.9V 43 18 REC GATE 44 Bias HEAD SW CTRL 45 BF 17 REC "H" 16 Vcc 3.0V 0.1 PB "H" 46 IAMP IAMP PRE 1k 1k 10k 10k IAMP PRE IAMP 15 Vcc 4.9V 47 14 Vcc 4.9V I0adj 48 13 I0adj 1 0.1 1000p 2 3 0.1 4 1000p 5 6 7 8 1000p 9 0.1 10 11 0.1 10 10 PRE IN A2 12 1000p 1k 10 10 1k 1k PRE IN B1 PRE IN B2 Fig. 1 4 PRE IN A1 1k Video ICs BH7272KV *Measurement circuit (recording system) AGC DET GATE PB AGC OUT PB RF OUT PB RF OUT PB AGC IN MUTE 0.1 REC IN 26 5.1k 27 25 1000p 30 29 50k 36 35 34 33 32 0.1 31 28 37 DET LIMIT 24 LIMIT LEVEL adj Vcc 4.9V 38 3rd AGC 23 LIMIT Vth adj 39 22 40 2nd VAMP 21 41 0.1 0.1 42 20 BH7272KV Balance Balance 19 Vcc 4.9V 43 18 REC GATE 44 BF Bias HEAD SW CTRL 45 17 REC "H" 16 Vcc 3V 0.1 PB "H" 46 IAMP IAMP PRE 1k 1k 10k 10k IAMP PRE IAMP 15 Vcc 4.9V 47 14 Vcc 4.9V I0adj 48 13 I0adj 1 1000p 2 10 3 4 1000p 5 6 7 8 1000p 9 10 10 11 12 1000p REC OUT B REC OUT A Fig. 2 5 Video ICs BH7272KV *Circuit operation (1) Control logic table Mode PB-H 46pin REC PAUSE L L REC L L L PB H H H After recording H H H Notes Control signals REC-H 17pin L H H H H L L H H H H HSW 45pin x L L H H L H L L H H REC GATE 18pin x L H L H x x L H L H REC x 1 1 1 1 x x 1 1 1 1 REC-A x x x x 1 x x x x x 1 Circuit operation REC-B x x 1 x x x x x 1 x x PB x x x x x 1 1 1 1 1 1 PB-A x x x x x x 1 x x 1 x PB-B x x x x x 1 x 1 x x x Low: 1V or less High: 2V or more x: Irrelevant 1: Operating x: Power save state (2) Mute circuit 33pin MUTE 33pin Notes L H Low: 1V or less High: 2V or more Operation MUTE OFF MUTE ON -- (3) AGC DET GATE circuit 32pin AGC DET GATE 32pin Notes L H Low: 1V or less High: 2V or more Operation AGC detection on AGC detection off -- 6 Video ICs BH7272KV *I / O circuits Pin No. Pin name Pin voltage Equivalent internal circuit 20 Function 1 2 REC FB + B HEAD + B 2.5 (2.5) 2.5 (2.5) 5k REC DC feedback HEAD B 2 1 20 20 3 4 HEAD - B REC FB - B 2.5 (2.5) 2.5 (2.5) 5k HEAD B REC DC feedback 3 4 20 5 GND -- -- GND for PB 1st stage amplifier and REC current amplifier 1k 6 PB SW + OUT 0.2 (-) 10k 6 1st stage amplifier positive phase output PB feedback 1k 1k 7 PB SW - OUT 0.2 (-) 10k 7 1st stage amplifier reverse phase output PB feedback 1k 8 GND -- -- GND for REC current amplifier The pin voltages in brackets are for REC mode, all others are for PB mode. 7 Video ICs BH7272KV Pin No. Pin name Pin voltage Equivalent internal circuit 20 Function 9 10 REC FB - A HEAD - A 2.5 (2.5) 2.5 (2.5) 5k REC DC feedback HEAD A 10 9 20 20 11 12 HEAD + A REC FB + A 2.5 (2.5) 2.5 (2.5) 5k HEAD A REC DC feedback 11 12 20 12.8k 13 12.8k 13 REC BTL A I0adj 2.5 (3.4) 2.5k 400 HEAD A recording current adjustment 14 VCC 5V -- -- VCC for REC current amplifier 25k 15 BIAS FILTER 2.5 (2.5) 15 Bias filter for head connection pins (pins 2, 3, 10, and 11) 25k 16 VCC 3V -- -- VCC for logic circuits The pin voltages in brackets are for REC mode, all others are for PB mode. 8 Video ICs BH7272KV Pin No. Pin name Pin voltage Equivalent internal circuit Function 15k 17 17 REC "H" 0.0 (0.0) 100k Mode control 15k 18 18 REC GATE 0.0 (0.0) 100k Mode control 19 VCC 5V -- -- VCC for bias and REC limiter amplifier 20 GND -- -- GND for bias and control logic 400 500 21 21 REC LIMIT + OUT 2.5 (2.5) REC limiter amplifier positive phase output 400 400 500 22 22 REC LIMIT - OUT 2.5 (2.5) REC limiter amplifier reverse phase output 400 35k 23 LIMIT Vth adj -- (1.5) 23 15k REC limiter amplifier input threshold level adjustment The pin voltages in brackets are for REC mode, all others are for PB mode. 9 Video ICs BH7272KV Pin No. Pin name Pin voltage Equivalent internal circuit Function 70k 70k 5k 24 REC LEVEL adj 1.5 (1.5) 24 1k 30k 800 30k REC limiter amplifier output level adjustment 500 25 REC IN -- (1.5) 25 REC input 500 26 GND -- -- GND for REC limiter amplifier 27 PB AGC OUT 2.4 (-) 27 Playback system AGC output 28 29 PB AGC DET IN PB AGC LEVEL adj 2.5 (-) 3.6 (3.6) 9k 7k 29 16k 28 18k Playback system AGC detector input Playback system AGC level adjustment 30 PB AGC FILTER -- (-) 30 Playback system AGC filter 200 31 PB AGC IN 2.5 (-) 31 2k Playback system AGC input The pin voltages in brackets are for REC mode, all others are for PB mode. 10 Video ICs BH7272KV Pin No. Pin name Pin voltage Equivalent internal circuit Function 15k 32 PB AGC GATE 0.0 (0.0) 32 PB AGC detection control 100k 15k 33 MUTE 0.0 (0.0) 33 Playback system mute control 100k 34 N.C. -- -- -- 35 36 PB SW A OUT PB SW B OUT 3.2 (-) 3.2 (-) 35 36 Playback system amplifier output 37 GND -- -- GND for PB amplifier, AGC, and peak amplifier 38 VCC 5V -- -- VCC for PB amplifier, AGC, and peak amplifier 39 40 PB2nd OUT B PB2nd OUT A 2.5 (-) 2.5 (-) 380 39 40 Playback system 2nd amplifier output Playback system 2nd amplifier output The pin voltages in brackets are for REC mode, all others are for PB mode. 11 Video ICs BH7272KV Pin No. Pin name Pin voltage Equivalent internal circuit Function 41 42 PB2nd IN A PB2nd IN B 2.5 (-) 2.5 (-) 41 42 80 1k 1k Playback system 2nd amplifier input Playback system 2nd amplifier input 1k 43 PB SW + OUT 2.0 (-) 43 1st stage amplifier positive phase output 1k 44 PB SW - OUT 2.0 (-) 44 1st stage amplifier reverse phase output 15k 45 45 HSW 0.0 (0.0) 100k Mode control 15k 46 46 PB "H" 0.0 (0.0) 100k Mode control -- 47 VCC 5V -- -- VCC for PB 1st stage amplifier 12.8k 48 12.8k 48 REC BTL B I0adj 2.5 (3.4) 2.6k 400 HEAD B recording current adjustment The pin voltages in brackets are for REC mode, all others are for PB mode. 12 Video ICs BH7272KV *Application example AGC DET GATE PB RF OUT 50k 0.1 0.1 PB AGC OUT 1000p MUTE REC IN 26 5.1k 27 25 36 35 34 33 32 31 30 29 28 37 DET LIMIT 24 LIMIT LEVEL adj Vcc 4.9V 38 3rd AGC 23 LIMIT Vth adj 39 22 40 2nd VAMP 21 41 20 0.1 0.1 42 BH7272KV Balance Balance 19 Vcc 4.9V 43 18 REC GATE 44 Bias HEAD SW CTRL 45 BF 17 REC "H" 16 Vcc 3.0V 0.1 PB "H" 46 IAMP IAMP PRE 1k 1k 10k 10k IAMP PRE IAMP 15 Vcc 4.9V 47 14 Vcc 4.9V I0adj 48 13 I0adj 1 2 3 4 5 6 7 8 9 10 11 12 1000p 1000p 1000p 1000p HEAD A HEAD B Requires adjustment Fig. 3 13 Video ICs BH7272KV *External dimensions (Units: mm) 9.0 0.3 7.0 0.2 36 9.0 0.3 7.0 0.2 37 48 1 1.425 0.1 0.10 25 24 13 12 0.5 0.125 0.1 0.10 0.5 0.2 0.1 VQFP48 14 |
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