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 •1)Features The playback amplifier has a total gain of 57dB (Typ.), 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. 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. •Absolute maximum ratings (Ta = 25°C) Parameter Symbol Limits Unit VCC 7.0 V Power supply voltage Power dissipation BA7180AS BA7180AFS 1000∗1 Pd mW 937.5∗2 Operating temperature Topr – 20 ~ + 65 °C Storage temperature Tstg – 55 ~ + 150 °C ∗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 Min. Typ. Max. Unit VCC 4.5 5.0 5.5 V 1 Video ICs BA7180AS / BA7180AFS •Block diagram BA7180AS 22 21 20 19 PB AGC OUT 18 PB AGC FILTER 17 H SYNC IN 16 PB RF OUT 15 AT ENVE OUT 14 N.C. 13 REC IN 12 VCC – AGC HPF N.C. 4 N.C. REC LEVEL ADJ 3 REC DCFB GND 2 2 DET FILTER 1 DFF IN DET PRE RF PRE – 7 PRE IN 2 (REC – OUT 2) 6 GND 1 5 PRE IN 1 (REC – OUT 1) DET HPF 8 N.C. + AGC MUTE REC VCC 11 PRE / REC 10 PB / EE / REC CTRL LOGIC 9 REC AGC FILTER DET REC + OUT BA7180AFS 20 19 18 N.C. 17 PB AGC OUT 16 PB AGC FILTER 15 H SYNC IN 14 PB RF OUT 13 AT ENVE OUT 12 REC IN 11 VCC – REC LEVEL ADJ 3 REC DCFB GND 2 2 DET FILTER 1 DFF IN AGC HPF PRE DET RF PRE 6 PRE IN 2 (REC – OUT 2) 5 GND 4 PRE IN 1 (REC – OUT 1) – 7 REC + OUT + DET AGC MUTE REC VCC PRE / REC 10 LOGIC PB / EE / REC CTRL DET 9 2 REC AGC FILTER HPF 8 N.C. Video ICs BA7180AS / BA7180AFS •Electrical characteristics (unless otherwise noted, Ta = 25°C, V CC = 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 Iq (P) — 18 45 mA No signal Fig.1 Voltage gain CH-1 GVP1 54 57 60 dB Pin 5 input = 0.3mVP-P, pin 1: L, pin 16 output measurement Fig.1 Voltage gain CH-2 GVP2 54 57 60 dB Pin 7 input = 0.3mVP-P, pin 1: L, pin 16 output measurement Fig.1 Voltage gain differential ∆G VP 0 +1 dB ∆G VP = GVP1 – GVP2 Fig.1 Fig.1 –1 Frequency characteristic ∆GVf –7 –3 0 dB Difference in pin 16 output level for f = 8.0 / 1.0MHz, VIN = 0.3mVP-P 2nd harmonic distortion 2HDP — – 45 – 38 dBc VIN = 0.3mVP-P, 8.0MHz spurious Fig.1 3rd harmonic distortion 3HDP — – 45 – 40 dBc VIN = 0.3mVP-P,12.0MHz spurious, guaranteed design value. Fig.1 Maximum output level VOMP 1.0 1.5 — VP-P When pin 16 output 2nd harmonic distortion is -30dBc Fig.1 Crosstalk CTP — – 38 – 32 dBc Difference in pin 16 output level for pin 1: H / L. Fig.1 ∆V ODC – 150 0 + 150 mVP-P Pin 16 output DC offset for pin 1: H / L. Fig.1 Output DC offset Input conversion noise VNIN — 0.25 1.0 µVrms RG = 10Ω, input conversion of pin 14 output noise, guaranteed design value. Fig.1 AGC output level VAGC 250 300 350 mVP-P VIN = 0.3mVP-P, Pin 19 output measurement Fig.1 AGC control sensitivity ∆VAGC — 0.3 2.0 dB Pin 19 output level difference for VIN = 0.15 ~ 0.6mVP-P Fig.1 AGC amp frequency characteristic ∆GVAF –3 0.5 +3 dB Difference in pin 19 output level for f = 8.0 / 1.0MHz VIN = 0.3mVP-P, guaranteed design value. Fig.1 PB switch ON resistance RON9 — 4 10 Ω Pin 9 impedance, guaranteed design value. Fig.1 PRE CH 2 threshold voltage VTH1H 3.5 — VCC V Pin 1 DC voltage for CH 2 operation Fig.1 PRE CH 1 threshold voltage VTH1L 0 — 1.2 V Pin 1 DC voltage for CH 1 operation Fig.1 ENVE output level VENV2 1.9 2.4 2.9 V Pin 15 output measurement when pin 16 output = 100mVP-P Fig.1 ENVE output level VENV3 3.45 3.7 3.95 V Pin 15 output measurement when pin 16 output = 400mVP-P Fig.1 ENVE saturation voltage VENV4 4.0 4.5 — V Pin 15 output measurement for large signal Fig.1 PB mode holding voltage VTH10H 3.8 — VCC V Pin 11 DC voltage for PB mode Fig.1 EE mode holding voltage VTH10M 2.2 — 2.8 V Pin 11 DC voltage for REC MUTE mode Fig.1 REC mode threshold voltage VTH10L 0 — 1.2 V Pin 11 DC voltage for REC mode Fig.1 3 Video ICs BA7180AS / BA7180AFS Parameter Conditions (BA7180AS) Symbol Min. Typ. Max. Unit Measurement circuit 〈Recording system〉 (Pin 11 in Fig. 2 mesurement circuit "L") Quiescent current Iq (R) — 72 110 Recording AGC level IOAR 27 30 AGC control sensitivity ∆IOAR — REC amplifier frequency characteristic ∆IOAF –4 2nd harmonic distortion mA No signal Fig.2 33 mAP-P Pin 13 input = 125mVP-P, pin 9 output measurement Fig.2 0.3 1.5 dB Pin 9 output level difference for pin 13 input = 62.5mVP-P ~ 250mVP-P Fig.2 – 1.5 — dB Pin 9 output level difference for f = 8.0 / 1.0MHz, pin 12 input = 125mVP-P, guaranteed design value. Fig.2 2HDR — – 45 – 38 dBc Pin 13 input = 125mVP-P 8MHz spurious Fig.2 3rd harmonic distortion 3HDR — – 50 – 40 dBc Pin 13 input = 125mVP-P 12MHz spurious, guaranteed design value. Fig.2 Cross modulation distortion CMDR — – 50 – 40 dBc 4.0MHz ± 630kHz spurious, guaranteed design value. Fig.2 Maximum output level IOMR 40 50 Recording current load characteristic ∆I ORL – 1.5 – 0.35 Mute attenuation ratio — mAP-P When pin 9 output 2nd harmonic distortion is -30dB Fig.2 — dB Pin 9 output level difference for load L: 8.2 ~ 12µH, guaranteed design value. Fig.2 MUR — – 45 – 38 dBc Pin 9 output level difference for pin 11: M / H. Fig.2 AGC mode holding voltage VTH15H 2.7 — VCC V Pin 17 DC voltage to maintain recording AGC operation Fig.2 AGC mode holding voltage VTH15L 0 — 1.2 V Pin 17 DC voltage to maintain recording AGC stopped Fig.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 CC Parameter 4 Symbol Min. Typ. = 4.8V and f = 4.0MHz) Max. Unit Conditions (BA7180AS) ENVE output level VENV2' 1.8 2.3 2.8 V Pin 15 output measurement when pin 16 output = 100mVP-P. ENVE output level VENV3' 3.35 3.6 3.85 V Pin 15 output measurement when pin 16 output = 400mVP-P. DET HPF HPF – – 6 7 8 13 DET + 9 10 L: REC START REC AGC 14 PB / EE / REC CTRL L: REC MUTE 5 15 0.1µ PRE 16 N.C. 17 1k 18 PRE IN 2 4 0.1µ 3 19 10 2 0.1µ 20 N.C. 21 10 1k 1 0.1µ 0.1µ 22 PRE IN 1 DFF IN 0.1µ N.C. 0.1µ 390k 0.1µ 0.1µ N.C. 43k VCC 5V REC IN AT ENVE HOLD OUT PB RF OUT H SYNC IN PB AGC OUT REC LEVEL ADJ Video ICs BA7180AS / BA7180AFS •Measurement circuits BA7180AS (playback system) + 12 MUTE VCC RF AGC PRE / REC PRE LOGIC DET 11 Units: R [Ω] C [F] L [H] Fig.1 5 6 REC AGC DET HPF HPF – – 6 Fig.2 7 8 14 13 DET + 9 10 Units: R [Ω] C [F] L [H] L: REC START 5 15 PB / EE / REC CTRL L: REC MUTE PRE 16 0.1µ 4 17 N.C. 18 10 3 0.1µ 2 19 8.2µ 8.2µ 20 0.1µ 21 N.C. 1 0.1µ 0.1µ 22 REC OUT DFF IN 0.1µ N.C. 0.1µ 390k 0.1µ 0.1µ N.C. 43k VCC 5V REC IN AT ENVE HOLD OUT PB RF OUT H SYNC IN PB AGC OUT REC LEVEL ADJ Video ICs BA7180AS / BA7180AFS BA7180AS (recording system) + 12 MUTE VCC RF AGC PRE / REC PRE LOGIC DET 11 – 5 6 7 13 12 DET REC AGC DET HPF HPF PRE 8 9 L: REC START 4 14 PB / EE / REC CTRL PRE 15 L: REC MUTE – 0.1µ N.C. 16 1k 17 PRE IN 2 3 0.1µ 18 10 2 0.1µ 19 10 1k 1 0.1µ 0.1µ 20 PRE IN 1 DFF IN N.C. 0.1µ 0.1µ 390k 0.1µ 0.1µ 43k VCC 5V REC IN AT ENVE HOLD OUT PB RF OUT H SYNC IN PB AGC OUT REC LEVEL ADJ Video ICs BA7180AS / BA7180AFS BA7180AFS (playback system) + 11 MUTE VCC RF AGC + PRE / REC LOGIC DET 10 Units: R [Ω] C [F] L [H] Fig.3 7 8 – – 5 6 Fig.4 7 13 12 DET REC AGC DET HPF HPF PRE 8 9 Units: R [Ω] C [F] L [H] L: REC START 4 14 PB / EE / REC CTRL PRE 15 L: REC MUTE 3 16 0.1µ N.C. 17 10 2 0.1µ 18 8.2µ 8.2µ 19 0.1µ 1 0.1µ 0.1µ 20 REC OUT DFF IN N.C. 0.1µ 0.1µ 390k 0.1µ 0.1µ 43k VCC 5V REC IN AT ENVE HOLD OUT PB RF OUT H SYNC IN PB AGC OUT REC LEVEL ADJ Video ICs BA7180AS / BA7180AFS BA7180AFS (recording system) + 11 MUTE VCC RF AGC + PRE / REC LOGIC DET 10 Video ICs BA7180AS / BA7180AFS Circuit operation •Control system logic table (1) DFF IN (pin 1) • Playback input selection (head switching) Control pin Function DFF IN Selected playback input Control voltage VCTRL1 [V] H Channel 2 (PRE IN2) 3.5 ~ VCC L Channel 1 (PRE IN1) 0.0 ~ 1.2 (2) H SYNC IN (BA7180AS: pin 17, BA7180AFS: pin 15) • Controls recording AGC detector block operation. Control pin Function H SYNC AGC detector Control voltage VCTRL1 [V] H ON 2.7 ~ VCC L OFF 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 Mode Function PRE AMP AT ENVE REC MUTE REC AMP Control voltage VCTRL1 [V] H PB ON ON OFF OFF 3.8 ~ VCC M REC MUTE OFF OFF ON ON 2.2 ~ 2.8 L REC OFF OFF OFF ON 0.0 ~ 1.2 · The PB / EE / REC CTRL pin is pulled up to VCC via a 33kΩ resistor. notes •N.C.Operation pins can be connected to GND. 9 10 – PRE 6 Fig.5 15 REC AGC DET HPF HPF – 7 8 14 13 DET + 9 10 Units: R [Ω] C [F] L [H] L: REC START 5 16 PB / EE / REC CTRL L: REC MUTE 4 17 0.1µ 3 18 N.C. 2 19 0.1µ 20 0.1µ 21 N.C. 1 0.1µ 0.1µ 22 HEAD B HEAD A DFF IN 0.1µ N.C. 0.1µ 390k 0.1µ 0.1µ N.C. 43k VCC 5V REC IN AT ENVE HOLD OUT PB RF OUT H SYNC IN PB AGC OUT REC LEVEL ADJ Video ICs BA7180AS / BA7180AFS •Application examples BA7180AS + 12 MUTE VCC RF AGC PRE / REC PRE LOGIC DET 11 PRE 5 14 – – 6 7 13 REC AGC DET HPF HPF 12 DET + 8 9 L: REC START 4 15 PB / EE / REC CTRL L: REC MUTE 3 16 0.1µ 17 N.C. 2 0.1µ 18 HEAD B 19 0.1µ 1 0.1µ 0.1µ 20 HEAD A DFF IN 0.1µ 0.1µ 390k 0.1µ 0.1µ N.C. 43k VCC 5V REC IN AT ENVE HOLD OUT PB RF OUT H SYNC IN PB AGC OUT REC LEVEL ADJ Video ICs BA7180AS / BA7180AFS BA7180AFS + 11 MUTE VCC RF AGC PRE / REC PRE LOGIC DET 10 Units: R [Ω] C [F] L [H] Fig.6 11 Video ICs BA7180AS / BA7180AFS •External dimensions (Units: mm) BA7180AS BA7180AFS 8.7 ± 0.2 0.5 ± 0.1 SDIP22 12 1 10 0.15 ± 0.1 1.8 ± 0.1 0.3 ± 0.1 1.778 11 7.62 0.11 11 1 7.8 ± 0.3 12 6.5 ± 0.3 0.51Min. 3.4 ± 0.2 3.95 ± 0.3 22 20 5.4 ± 0.2 19.4 ± 0.3 0.8 0.36 ± 0.1 0.3Min. 0° ~ 15° 0.15 SSOP-A20