BA7180

Video ICs 2-channel PRE / REC amplifier with auto-tracking interface BA7180AS / BA7180AFS The BA7180AS and BA7180AFS are PRE / REC amplifiers developed for use in video cassette recorders. They have been designed for use in two-head decks and feature built-in FB damping, two preamplifiers, a chroma output amplifier, an FM output amplifier (with AGC), an envelope detector, a constant-current BTL-drive REC amplifier (with AGC) and built-in channel and REC / PB switches on a single monolithic IC. •Applications VCRs •Features amplifier has a total gain of 57dB (Typ.), 1) The playback and has a low-noise preamplifier. Designed for VHSband operation with low external parts count.The ICs have 2 circuits for 2-head VCR applications. 2) Two playback output systems (through output and AGC output). The AGC output level is 300mVP-P (Typ.); suitable for FM brightness signal output. 3) Auto-tracking interface for automated tracking adjustment. The detector characteristic is non-linear to improve tracking accuracy during playback of low signal levels. 4) The recording amplifier uses constant-current BLT drive that handles load variations (i.e. head impedance) well, and gives stable recording characteristics. A single circuit is provided for 2-head VCR use. 5) Built-in recording level AGC means adjustment of FM recording current is not necessary. 6) Head switches for 2-channel PRE / REC system provided. 7) Operates off a sigle 5V power supply, with low power dissipation. •Absolute maximum ratings (Ta = 25°C) Parameter Power supply voltage Power dissipation BA7180AS BA7180AFS Symbol VCC Pd Topr Tstg Limits 7.0 1000∗1 937.5∗2 – 20 ~ + 65 – 55 ~ + 150 Unit V mW °C °C Operating temperature Storage temperature ∗1 Reduced by 10.0mW for each increase in Ta of 1°C over 25°C (free air). ∗2 When mounted on a 90mm × 90mm, t = 1.6mm glass epoxy board, reduced by 7.5mW for each increase in Ta of 1°C over 25°C. •Recommended operating conditions (Ta = 25°C) Parameter Playback / recording Symbol VCC Min. 4.5 Typ. 5.0 Max. 5.5 Unit V 1 Video ICs BA7180AS / BA7180AFS •Block diagram BA7180AS 22 DFF IN DET FILTER REC DCFB N.C. PRE IN 1 (REC – OUT 1) GND 1 PRE IN 2 (REC – OUT 2) N.C. REC + OUT REC AGC FILTER PB / EE / REC CTRL GND 2 REC LEVEL ADJ N.C. PB AGC OUT PB AGC FILTER H SYNC IN PB RF OUT AT ENVE OUT N.C. REC IN VCC – – 1 2 3 HPF AGC 21 20 19 4 PRE DET 18 5 6 7 17 RF PRE 16 HPF DET 15 8 + 14 9 DET PRE / REC LOGIC AGC MUTE REC 13 10 11 VCC 12 BA7180AFS 20 DFF IN GND 2 1 2 3 – 19 DET FILTER REC LEVEL ADJ 18 REC DCFB PRE IN 1 (REC – OUT 1) GND PRE IN 2 (REC – OUT 2) REC + OUT N.C. HPF AGC PRE 17 PB AGC OUT 4 5 6 7 8 DET DET 16 PB AGC FILTER PRE – + 15 H SYNC IN RF 14 PB RF OUT HPF DET 13 N.C. AT ENVE OUT AGC MUTE REC 12 REC AGC FILTER REC IN 9 10 PRE / REC LOGIC VCC 11 PB / EE / REC CTRL VCC 2 Video ICs BA7180AS / BA7180AFS CC = •Electrical characteristics (unless otherwise noted, Ta = 25°C, V Parameter Symbol Min. Typ. Max. Unit 5.0V and f = 4.0MHz) Conditions (BA7180AS) Measurement circuit 〈Playback system〉 (Pin 11 in Fig.1 measurement circuit "H" ) Quiescent current Voltage gain CH-1 Voltage gain CH-2 Voltage gain differential Frequency characteristic 2nd harmonic distortion 3rd harmonic distortion Maximum output level Crosstalk Output DC offset Input conversion noise AGC output level AGC control sensitivity AGC amp frequency characteristic PB switch ON resistance PRE CH 2 threshold voltage PRE CH 1 threshold voltage ENVE output level ENVE output level ENVE saturation voltage PB mode holding voltage EE mode holding voltage REC mode threshold voltage Iq (P) GVP1 GVP2 ∆G VP ∆GVf 2HDP 3HDP VOMP CTP — 54 54 –1 –7 — — 1.0 — 18 57 57 0 –3 – 45 – 45 1.5 – 38 0 0.25 300 0.3 0.5 4 — — 2.4 3.7 4.5 — — — 45 60 60 +1 0 – 38 – 40 — – 32 + 150 1.0 350 2.0 +3 10 VCC 1.2 2.9 3.95 — VCC 2.8 1.2 mA dB dB dB dB dBc dBc VP-P dBc mVP-P µVrms mVP-P dB dB Ω V V V V V V V V No signal Pin 5 input = 0.3mVP-P, pin 1: L, pin 16 output measurement Pin 7 input = 0.3mVP-P, pin 1: L, pin 16 output measurement ∆G VP = GVP1 – GVP2 Difference in pin 16 output level for f = 8.0 / 1.0MHz, VIN = 0.3mVP-P VIN = 0.3mVP-P, 8.0MHz spurious VIN = 0.3mVP-P,12.0MHz spurious, guaranteed design value. When pin 16 output 2nd harmonic distortion is -30dBc Difference in pin 16 output level for pin 1: H / L. Pin 16 output DC offset for pin 1: H / L. RG = 10Ω, input conversion of pin 14 output noise, guaranteed design value. VIN = 0.3mVP-P, Pin 19 output measurement Pin 19 output level difference for VIN = 0.15 ~ 0.6mVP-P Difference in pin 19 output level for f = 8.0 / 1.0MHz VIN = 0.3mVP-P, guaranteed design value. Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 Fig.1 ∆V ODC – 150 VNIN VAGC ∆VAGC ∆GVAF RON9 VTH1H VTH1L VENV2 VENV3 VENV4 VTH10H VTH10M VTH10L — 250 — –3 — 3.5 0 1.9 3.45 4.0 3.8 2.2 0 Pin 9 impedance, guaranteed design value. Pin 1 DC voltage for CH 2 operation Pin 1 DC voltage for CH 1 operation Pin 15 output measurement when pin 16 output = 100mVP-P Pin 15 output measurement when pin 16 output = 400mVP-P Pin 15 output measurement for large signal Pin 11 DC voltage for PB mode Pin 11 DC voltage for REC MUTE mode Pin 11 DC voltage for REC mode 3 Video ICs BA7180AS / BA7180AFS Parameter Symbol Min. Typ. Max. Unit Conditions (BA7180AS) Measurement circuit 〈Recording system〉 (Pin 11 in Fig. 2 mesurement circuit "L") Quiescent current Recording AGC level AGC control sensitivity REC amplifier frequency characteristic 2nd harmonic distortion 3rd harmonic distortion Cross modulation distortion Maximum output level Recording current load characteristic Mute attenuation ratio AGC mode holding voltage AGC mode holding voltage Iq (R) — 27 — –4 72 30 0.3 – 1.5 110 mA No signal Pin 13 input = 125mVP-P, pin 9 output measurement Pin 9 output level difference for pin 13 input = 62.5mVP-P ~ 250mVP-P Pin 9 output level difference for f = 8.0 / 1.0MHz, pin 12 input = 125mVP-P, guaranteed design value. Pin 13 input = 125mVP-P 8MHz spurious Pin 13 input = 125mVP-P 12MHz spurious, guaranteed design value. 4.0MHz ± 630kHz spurious, guaranteed design value. Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 Fig.2 IOAR ∆IOAR ∆IOAF 2HDR 3HDR CMDR IOMR 33 mAP-P 1.5 — dB dB dBc dBc dBc — – 45 – 38 — – 50 – 40 — – 50 – 40 40 50 — — mAP-P When pin 9 output 2nd harmonic distortion is -30dB dB dBc V V Pin 9 output level difference for load L: 8.2 ~ 12µH, guaranteed design value. Pin 9 output level difference for pin 11: M / H. Pin 17 DC voltage to maintain recording AGC operation Pin 17 DC voltage to maintain recording AGC stopped ∆I ORL – 1.5 – 0.35 MUR VTH15H VTH15L — – 45 – 38 2.7 0 — — VCC 1.2 Note: dBc: dB below carrier (used to express relative level from carrier reference for convenience sake) •Reference values (unless otherwise noted, Ta = 25°C, V Parameter ENVE output level ENVE output level Symbol VENV2' VENV3' Min. 1.8 3.35 Typ. 2.3 3.6 CC = 4.8V and f = 4.0MHz) Unit V V Conditions (BA7180AS) Pin 15 output measurement when pin 16 output = 100mVP-P. Pin 15 output measurement when pin 16 output = 400mVP-P. Max. 2.8 3.85 4 Video ICs 22 1 •Measurement circuits DFF IN 0.1µ 43k 21 2 REC LEVEL ADJ 0.1µ 20 3 19 4 AGC HPF N.C. 1k – 0.1µ 18 PRE DET 5 10 17 6 0.1µ N.C. BA7180AS (playback system) PRE IN 1 PB AGC OUT 0.1µ H SYNC IN 390k 16 PB RF OUT 0.1µ Fig.1 RF 10 PRE 7 0.1µ – 1k 8 N.C. + HPF DET 9 AGC 0.1µ DET 10 MUTE REC 11 VCC LOGIC PRE / REC PRE IN 2 15 14 13 0.1µ 12 N.C. AT ENVE HOLD OUT REC IN BA7180AS / BA7180AFS Units: R [Ω] PB / EE / REC CTRL L: REC MUTE C [F] L [H] + L: REC START VCC 5V 5 6 22 1 DFF IN 0.1µ 43k 21 2 REC LEVEL ADJ 0.1µ 20 3 19 4 – 0.1µ 18 DET AGC HPF N.C. 0.1µ PRE 5 8.2µ 0.1µ 17 H SYNC IN 390k 16 PB RF OUT 0.1µ – 8 15 HPF DET AT ENVE HOLD OUT 6 RF N.C. Video ICs BA7180AS (recording system) PB AGC OUT Fig.2 8.2µ PRE 7 0.1µ 10 N.C. + 9 AGC 0.1µ DET 10 MUTE REC 11 VCC LOGIC PRE / REC REC OUT 14 13 12 N.C. REC IN 0.1µ BA7180AS / BA7180AFS Units: R [Ω] PB / EE / REC CTRL L: REC MUTE C [F] L [H] + L: REC START VCC 5V Video ICs 1 20 DFF IN 0.1µ 43k REC LEVEL ADJ 19 2 0.1µ 18 3 N.C. – PRE IN 1 1k 0.1µ 17 AGC BA7180AFS (playback system) HPF PRE 4 PB AGC OUT 0.1µ 10 16 DET 5 0.1µ 15 H SYNC IN 390k Fig.3 10 PRE 6 RF 0.1µ – PRE IN 2 7 1k 14 0.1µ + PB RF OUT 8 AGC 13 HPF DET N.C. 0.1µ DET 9 AT ENVE HOLD OUT 12 MUTE REC REC IN 0.1µ 11 VCC PB / EE / REC CTRL LOGIC 10 C [F] BA7180AS / BA7180AFS Units: R [Ω] PRE / REC L [H] L: REC MUTE + L: REC START VCC 5V 7 8 1 20 0.1µ 43k REC LEVEL ADJ 19 2 0.1µ 18 3 N.C. – Video ICs DFF IN 0.1µ 17 AGC BA7180AFS (recording system) HPF PRE 4 8.2µ PB AGC OUT 0.1µ 16 DET 5 0.1µ 15 H SYNC IN 390k 8.2µ 6 PRE RF Fig.4 0.1µ 10 – REC OUT 7 + 14 0.1µ PB RF OUT 8 AGC 13 HPF DET N.C. 0.1µ DET 9 AT ENVE HOLD OUT 12 MUTE REC REC IN 0.1µ 11 VCC PB / EE / REC CTRL LOGIC 10 C [F] BA7180AS / BA7180AFS Units: R [Ω] PRE / REC L [H] L: REC MUTE + L: REC START VCC 5V Video ICs operation •Circuitsystem logic table Control (1) DFF IN (pin 1) • Playback input selection (head switching) Control pin DFF IN H L Function Selected playback input Channel 2 (PRE IN2) Channel 1 (PRE IN1) Control voltage VCTRL1 [V] 3.5 ~ VCC 0.0 ~ 1.2 BA7180AS / BA7180AFS (2) H SYNC IN (BA7180AS: pin 17, BA7180AFS: pin 15) • Controls recording AGC detector block operation. Control pin H SYNC H L Function AGC detector ON OFF Control voltage VCTRL1 [V] 2.7 ~ VCC 0.0 ~ 1.2 (3) PB / EE / REC CTRL (BA7180AS: pin 11, BA7180AFS: pin 10) • Playback / recording mute / recording mode switching Control pin PB / EE / REC H M L Mode PB REC MUTE REC Function PRE AMP ON OFF OFF AT ENVE ON OFF OFF REC MUTE OFF ON OFF REC AMP OFF ON ON Control voltage VCTRL1 [V] 3.8 ~ VCC 2.2 ~ 2.8 0.0 ~ 1.2 · The PB / EE / REC CTRL pin is pulled up to VCC via a 33kΩ resistor. •Operation notesconnected to GND. N.C. pins can be 9 •Application examples 10 22 1 Video ICs BA7180AS DFF IN 0.1µ 43k 21 2 REC LEVEL ADJ 0.1µ 20 3 19 4 – 0.1µ 18 DET AGC HPF N.C. 0.1µ PRE 5 0.1µ 17 H SYNC IN 390k 16 PB RF OUT 0.1µ – 15 8 HPF DET AT ENVE HOLD OUT N.C. PB AGC OUT HEAD A 6 RF Fig.5 PRE 7 0.1µ N.C. + 9 AGC 0.1µ DET 10 MUTE REC 11 VCC LOGIC PRE / REC HEAD B 14 13 12 N.C. REC IN 0.1µ PB / EE / REC CTRL L: REC MUTE C [F] + BA7180AS / BA7180AFS Units: R [Ω] L [H] L: REC START VCC 5V Video ICs 20 1 BA7180AFS DFF IN 0.1µ 43k 19 2 REC LEVEL ADJ 0.1µ 18 3 – N.C. 0.1µ 17 AGC HPF PRE 4 PB AGC OUT 0.1µ HEAD A 16 DET 5 Fig.6 PRE 6 RF 0.1µ – 7 + 8 HPF DET N.C. AGC 0.1µ DET 9 MUTE REC 10 VCC LOGIC PRE / REC HEAD B 15 0.1µ H SYNC IN 390k 14 0.1µ 13 12 0.1µ 11 AT ENVE HOLD OUT PB RF OUT REC IN BA7180AS / BA7180AFS Units: R [Ω] PB / EE / REC CTRL L: REC MUTE C [F] L [H] + L: REC START VCC 5V 11 Video ICs BA7180AS / BA7180AFS •External dimensions (Units: mm) BA7180AS BA7180AFS 8.7 ± 0.2 19.4 ± 0.3 7.8 ± 0.3 22 12 6.5 ± 0.3 5.4 ± 0.2 20 11 0.51Min. 3.4 ± 0.2 3.95 ± 0.3 1 11 7.62 1 1.8 ± 0.1 10 0.11 0.3 ± 0.1 0.8 0.36 ± 0.1 0.3Min. 0.15 1.778 0.5 ± 0.1 0° ~ 15° SDIP22 SSOP-A20 12 0.15 ± 0.1