ICs for VCR AN3336SB 4-Head VCR Recording/Playback Amplifier IC ■ Overview 36 18 19 15.2±0.30 1 0.3±0.11 Unit : mm The AN3336SB is a recording/playback amplifier IC for 4-head VCR. It includes RF-AGC, automatic tracking I/O, and envelope comparing circuit. ■ Features 2.85±0.2 1.3±0.25 (0.28) 0.5 1.3±0.25 0.1±0.1 0.1 0.2 +– 0.05 0.8 • Playback VCC = 5.0V, recording VCC = 12V • Built-in RF-AGC circuit • Built-in automatic tracking I/O circuit • Built-in envelope comparing circuit 8.4±0.30 11.93±0.30 36-Pin SSOP package (SSOP036-P-0450A) ■ Pin Descriptions Pin No. Pin name Pin No. Pin name 1 2 Head switching 19 Evelope detector capacitor for ch 3 and ch 4 Envelope ON/OFF switching 20 Peaking for recording 3 Ch 1 head amp. damping Automatic tracking output 4 Ch 1 head amp. input 21 22 5 Small-signal ground 23 Automatic tracking control 6 7 Ch 2 head amp. input 24 Automatic tracking VCC Ch 2 head amp. damping 25 Rec. Y–input 8 Sub-ground 26 Chroma output 9 Sub-ground 27 Sub-ground 10 Ch 3 head amp. damping 28 Sub-ground 11 12 Ch 3 head amp. input Sub-ground Small-signal ground 29 30 13 Ch 4 head amp. input 31 AGC output 14 Ch 4 head amp. damping 32 AGC detector capacitor 15 Rec. current amp. (LP) output 33 Envelope detector capacitor for ch 1 and ch 2 16 17 Rec. feedback Head amp. switching Rec. current amp. (SP) output 34 35 18 Rec. VCC 36 Playback VCC Automatic tracking detector capacitor Recording C–input ENV output, recording bias 1 ICs for VCR AN3336SB ■ Block Diagram PB 5V VCC + HASW C– IN ENV AT GCA Y– IN AT OUT SUB– GND MAIN– GND 0.1µF 1.5kΩ 0.1µF 0.01µF 33kΩ 36 35 34 33 32 Det. 31 30 29 28 27 26 25 24 23 22 AGC 21 20 19 Det. CHROMA Amp. LOG Mix. Comp. Det. Rec Logic Det. L SP H H L HA1 L HA2 H LP L H HA3 LP SP HA4 PB ON 1 2 3 4 + 1µF 5 6 0.01µF 0.01µF *100Ω 7 8 9 + 1µF *100Ω 10 1µF SUB–GND 11 + 12 13 0.01µF 0.01µF *100Ω PB ON 14 15 + 1µF *100Ω 16 0.1µF * 250 Ω 18 17 0.01µF 0.1µF + * 250 Ω HSW Rec VCC 12V ENV OFF H Note) The resistance of notation* should be between 0 and 500 ohms. ■ Absolute Maximum Ratings Parameter Symbol Unit Supply voltage (1) PB VCC 6 Supply current (2) Rec VCC 13 V 440 mW Operating ambient temperature Note 1) PD Topr –20 to +70 ˚C Storage temperature Note 1) Tstg –55 to +125 ˚C Power dissipation Note 2) Note 1) Ta=25˚C for except ambient temperature and storage temperatures. Note 2) Allowable power dissipation of the package at Ta=70˚C. 2 Rating V ICs for VCR AN3336SB ■ Recommended Operating Range (Ta=25˚C) Parameter Symbol Range Operating supply voltage range (1) PBVCC 4.5V to 5.5V Operating supply voltage range (2) RecVCC 8.5V to 12.5V ■ Electrical Characteristics (Ta=25±2˚C) Parameter Symbol Condition I36 PB VCC=5V CH 1 gain G4–26 PB VCC=5V CH 2 gain G6–26 CH 3 gain CH 4 gain min typ max Unit 56 mA 53 61 dB PB VCC=5V 53 61 dB G11–26 PB VCC=5V 53 61 dB G13–26 PB VCC=5V 53 61 dB HSW change-over sensitivity S1 PB VCC=5V 3.8 V HASW change-over sensitivity S34 PB VCC=5V 3.8 V V4–31 PB VCC=5V 270 mVP–P AGC control sensitivity ∆V4–31 PB VCC=5V 3.0 dB HSW DC unbalance (I) HSW26 (I) PB VCC=5V 100 mVP–P HSW DC unbalance (II) HSW26 (II) PB VCC=5V 100 mVP–P HASW DC unbalance (I) HASW26 (I) PB VCC=5V 100 mVP–P PB circuit current AGC output amplitude 130 HASW DC unbalance (II) HASW26 (II) PB VCC=5V 100 mVP–P Input conversion noise (1) N4–26/G4–26 PB VCC=5V 1.0 µVrms Input conversion noise (2) N6–26/G6–26 PB VCC=5V 1.0 µVrms Input conversion noise (3) N11–26/G11–26 PB VCC=5V 1.0 µVrms Input conversion noise (4) N13–26/G13–26 PB VCC=5V 1.0 µVrms 1.0 V Auto-tracking output at no-input V21min. PB VCC=4.8V Auto tracking max. output V21max. PB VCC=4.8V 3.8 V 3.5 VP–P ENV output amplitude V35 PB VCC=5V Rec. circuit current I18 Rec VCC=12V 48 mA mAP–P I17 Rec VCC=12V 17 32 LP Y–Rec. current output ratio I15/I17 Rec VCC=12V – 2.5 2.5 SP 8MHz f characteristics ratio I17H/I17 Rec VCC=12V –4 LP 8MHz f characteristics ratio I15H/I15 Rec VCC=12V –4 Rec. chroma output ratio I17C/I17 Rec VCC=12V –15 SP Y–Rec. current output dB dB dB –7 dB I36 PB VCC=5V (43) mA CH 1 gain G4–26 PB VCC=5V (57) dB CH 2 gain G6–26 PB VCC=5V (57) dB CH 3 gain G11–26 PB VCC=5V (57) dB CH 4 gain G13–26 PB VCC=5V (57) dB AGC output amplitude V4–31 PB VCC=5V (200) mVP–P PB circuit current Rec circuit current I18 Rec VCC=12V (33) mA SP Y–Rec. current output I17 Rec VCC=12V (12) mAP–P Rec. chroma output ratio I17C/I17 Rec VCC=12V (–12) dB D2f Rec VCC=12V (– 43) dB Cross-modulation relative level DM Rec VCC=12V Auto tracking SP output voltage (1) V21SP1 PB VCC=4.8V, Vin=400mVP–P (3.4) (3.9) V Auto tracking SP output voltage (2) V21SP2 PB VCC=4.8V, Vin=100mVP–P (1.5) (2.5) V PB VCC=4.8V (0.1) (0.5) V Rec. current 2nd harmonics distortion Auto tracking LP output voltage difference V21LP–V21SP2 (– 48) dB Note) The characteristics value in parentheses is not a guaranteed value, but reference one on design. 3 ICs for VCR AN3336SB ■ Functional Descriptions 1. Playback mode • Pin36 (playback VCC) = 5V typ. (Pins15 and 17 are grounded internally) • Pin18 (recording VCC) = open (1) Selecting a head amplifier output channel Channel Input pin Head SW Pin1 HASW Pin34 1 4 H L 2 6 L L 3 11 L H 4 13 H H SP LP (2) Starting the envelope comparator Env. ON/OFF SW Pin2 Open Low (special playback) Env. comparator Inactive Active (3) Automatic tracking interface Pin24 (automatic tracking VCC) = 5V typ. 4 HASW(Pin24) Automatic tracking High LP Low SP • When the SP mode of the automatic tracking interface switches to the LP mode, the gain of the amplifier increases 5.5dB. • When the gain control voltage at Pin23 increases, the gain of the circuit increases. ICs for VCR AN3336SB 2. Recording mode Pin18 (recording VCC) =12V typ. Pin36 (playback VCC) Pin24 (automatic tracking VCC) } Opened or grounded Pin35 : Recording internal bias current control How to control : • When the external resistance decreases, the internal circuit bias current (Itotal) increases. 35 R • R should be 27 to 33kΩ. HASW control at Pin34 HASW Pin34 SP output LP output Pin11,13 Pin4,6 Pin19 H OFF active GND Diode Open L active OFF Diode GND GND ■ Reference PD—Ta 2.000 1.800 Power dissipation PD (mW) 1.600 On glass-epoxy print board (50mm × 50mm × t 0.8mm) Rthj–a=69˚C/W PD=1449mW(25˚C) 1.449 1.400 1.200 IC without heatsink Rthj–a=120˚C/W PD=833mW (25˚C) 1.000 833 800 600 400 200 0 0 25 50 75 100 125 150 Ambient temperature Ta (˚C) 5