BA7780KV

Video ICs Stereo zoom microphone amplifier for camcorders BA7780KV The BA7780KV is a microphone amplifier developed for use in camcorders. The IC features an electronic volume circuit for presetting the curve required for the stereo zoom function, a microphone element power supply regulator, a wind-noise rejection filter, a current limiting circuit for external accessory power supplies, and an input for external microphone input. The IC operates off a 3.3V power supply. •Applications Camcorders •Features off a 3.0V to 5.25V power supply. 1) Operates 2) Zoom microphone processing function on one chip. 3) Built-in electronic volume for external setting of sensitivity and control voltage. 4) Adjustable microphone element sensitivity. 5) Matrix amplifier for stereo emphasis. 6) Automatic switching circuit for external inputs, and built-in external monaural decision circuit. •Absolute maximum ratings (Ta = 25°C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 7.0 750∗ – 10 ~ + 70 – 55 ~ + 125 Unit V mW °C °C ∗ Reduced by 7.5mW for each increase in Ta of 1°C over 25°C. •Recommended operating conditions (Ta = 25°C) Parameter Power supply voltage Symbol VCCS Min. 3.0 Typ. — Max. 5.25 Unit V 1 Video ICs BA7780KV •Block diagram OUT AMP IN L PRE OUT L MTX OUT L INV OUT L GC OUT L BL OUT L SUB IN L MTX IN L HPF IN L MODE 43 EXT IN L INT IN L VREG L 48 GND L 49 MIX1 IN L 50 13dB 47 46 45 44 43 42 41 40 39 GC 38 37 36 35 34 33 32 OUT L 31 MIC MONO 30 Z B 13dB REC EXT INT – + INT: ON GZ CONT 51 SUB INV2 OUT 52 SUB INV2 IN 53 SUB BUF2 OUT 54 SUB VCA OUT 55 SUB VCA IN 56 MIX CImt MIX2 OUT 57 SUB BUF2 IN 58 SUB INV1 OUT 59 SUB BUF1 OUT 60 EXT 15dB EXT INT EXTC L 29 Z A 28 Z SENSE 27 Z POINT 26 GAIN CONT 25 EX VCC OUT 24 EX VCC 23 VCC 22 Z AC HPFC 21 Z BC 20 IN MONI 19 HPF CONT 18 BIAS SUB 17 OUT R 16 EXTC R –+ RFLT BALANCE 5dB BALANCE 5dB INT SUB BUF1 IN 61 MIX1 OUT 62 MIX1 IN R 63 13dB 15dB MIX INT INT: 0N GND R 64 01 RIPL 02 SUB IN R 03 INT IN R 04 VREG R EXT 13dB GC 09 INV OUT R 10 GC OUT R 05 EXT IN R 06 MODE 6 07 PRE OUT R 08 OUT AMP IN R 11 MTX IN R MTX OUT R BL OUT R HPF IN R 2 BIAS R – + REG 12 13 14 BIAS 15 RFLT BIAS L BG Video ICs BA7780KV •Pin descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 Pin name RIPL SUB IN R INT IN R VREG R EXT IN R MODE 6 PRE OUT R OUT AMP IN R INV OUT R GC OUT R MTX IN R MTX OUT R BL OUT R HPF IN R BIAS R EXTC R OUT R BIAS SUB HPF CONT IN MONI Z BC Z AC VCC EX VCC EX VCC OUT GAIN CONT Z POINT Z SENSE ZA ZB MIC MONO OUT L EXTC L BIAS L HPF IN L BL OUT L MTX OUT L MTX IN L GC OUT L INV OUT L OUT AMP IN L PRE OUT L For bias ripple filter capacitor Sub microphone input Internal microphone input Regulator output External microphone input Mode control 6 input Preamplifier output Out amplifier input Inverter output Gain control amplifier output Matrix amplifier input Matrix amplifier output Zoom balance circuit output HPF input Bias output For connection of out amplifier output inhibit capacitor Signal output Sub bias output HFP control input Input switch decision signal output For connection of noise cutting capacitor for zoom control signal For connection of noise cutting capacitor for zoom control signal VCC Current limiter VCC Current limiter output Gain control amplifier switch input Cross-point variation input for zoom balance circuit Sensitivity variation input for zoom balance circuit Zoom control input Zoom control input External microphone monaural decision signal output Signal output For connection of out amplifier output inhibit capacitor Bias output HPF input Zoom balance circuit output Matrix amplifier output Matrix amplifier input Gain control amplifier output Inverter output Out amplifier input Preamplifier output Function Pin voltage (V) 1.65 1.65 1.65 2.5 1.65 — 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 2.3 1.65 1.65 — — — — 3.3 4.75 4.5 — — — — — — 1.65 2.3 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 Format 50kΩ 100kΩ 75kΩ C 75kΩ 25kΩ EF (P - P) 100kΩ EF (P - P) EF (P - P) B EF (P - P) EF (P - P) 100kΩ EF (P - P) C C (P - P) EF (P - P) 10kΩ C B B — — C 50kΩ B B B B C EF (P - P) C EF (P - P) 100kΩ EF (P - P) EF (P - P) B EF (P - P) EF (P - P) 100kΩ EF (P - P) 3 Video ICs BA7780KV Pin No. 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 Pin name MODE 43 EXT IN L VREG L INT IN L SUB IN L BG GND L MIX 1 IN L GZ CONT SUB INV2 OUT SUB INV2 IN SUB BUF2 OUT SUB VCA OUT SUB VCA IN MIX2 OUT SUB BUF2 IN SUB INV1 OUT SUB BUF1 OUT SUB BUF1 IN MIX1 OUT MIX1 IN R GND R Mode control 43 input External microphone input Regulator output Internal microphone input Sub microphone input Function Pin voltage (V) — 1.65 2.5 1.65 1.65 1.25 — 1.65 — 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 1.65 — Format 25kΩ 75kΩ C 75kΩ 100kΩ 10kΩ — 100kΩ 50kΩ EF (P - P) B EF (P - P) EF (P - P) 100kΩ EF (P - P) 100kΩ EF (P - P) EF (P - P) 100kΩ EF (P - P) 100kΩ — For regulator ripple filter capacitor Left channel GND Mixer amplifier input Sub VCA control input Sub inverter 2 output Sub inverter 2 input Sub buffer 2 output Sub VCA output Sub VCA input Mixer 2 output Sub buffer 2 input Sub inverter 1 output Sub buffer 1 output Sub buffer 1 input Mixer 1 output Mixer 1 input Right channel GND ∗ EF: emitter follower, P-P: push pull, B: base, and C: collector. All numerical values are standardized values. 4 Video ICs BA7780KV •Electrical characteristics Measurement conditions Unless otherwise noted, the following conditions apply: Ta = 25°C, VCC3.3V, external supply voltage (pin 24) = 4.75V, pin 19 = “H” or open, pin 26 = 1 / 2VCC, pin 51 = 0.58 × pin 4, pin 27 = 0.733 × pin 4, pin 28 = 0.80 × pin 4, pin 29 = 2.2V, pin 30 = 2.2V Parameter Current dissipation Voltage gain 1 Voltage gain 2 Voltage gain 3 Voltage gain 4 Distortion 1 Distortion 2 Distortion 3 Maximum output Output noise voltage 1 (EXT) Output noise voltage 2 (INT, WIDE) Output noise voltage 3 (INT, ZOOM) Input switch crosstalk (INT to EXT) Interchannel crosstalk GC OUT L / R gain differential Inverter OUT L / R gain differential Internal microphone power supply output voltage External power supply output voltage External power supply limit current Input switching CTL holding voltage Input signal level Int = – 31.5dBV Ext = – 38.5dBV Sub = – 33.5dBV (1kHz) Monitoring pins: 17 and 32 ∗ 1 JIS–A filter used ∗ 2 400Hz to 30kHz filter used Max. 12.0 29.0 27.5 24.5 21.5 0.5 0.25 0.5 — 60 60 120 – 70 – 70 1.5 1.5 2.75 — 30 VCC 0.7 VCC 2.0 0.5 VCC 0.5 – 5.0 1.0 8.0 1.0 Unit mA dB dB dB dB % % % Vrms µVrms µVrms µVrms dB dB dB dB V V mA V V V V V V V dB dB dB dB Conditions INT / EXT MIC IN, No input EXT MIC IN INT MIC IN, GAIN CTL H INT MIC IN, GAIN CTL M INT MIC IN, GAIN CTL L INT MIC IN, WIDE, Vo = 300mVrms EXT MIC IN, VO = 300mVrms INT MIC IN, ZOOM, V O = 300mVrms INT / EXT MIC IN, THD = 1%∗2 EXT MIC IN, Rg = 1kΩ∗1 INT MIC IN, Rg = 1kΩ∗1 GAIN CTL H INT MIC IN, Rg = 1kΩ∗1 Pins 29 and 30 = 0V, GAIN CTL H Note 1 Note 2 INT MIC IN, HML, 10 39 INT MIC IN, HML, 9 40 Pins 4 and 45 output current for 30kΩ load Pin 25 DC for pin 25 output current of 25mA Pin 25 output current when grounded “H” level, pin 6 / 43 DC “L” level, pin 6 / 43 DC “H” level, pin 26 DC “M” level, pin 26 DC “L” level, pin 26 DC Symbol IqE GVE GVIH GVIM GVIL THDW THDE THDZ VOM VONE VONW VONZ CTIE CTCH GVGLR GVILR VREG VEXT ILTD VHSWH VHSWL VHGH Min. — 27.0 21.5 18.5 16.5 — — — 0.75 — — — — — – 1.5 – 1.5 2.3 4.3 — 1.6 0 2.8 1.3 0 2.0 0 – 7.0 – 1.0 6.0 – 1.0 Typ. 8.5 28.0 24.5 21.5 18.5 0.05 0.1 0.15 0.95 30 30 60 – 76 – 76 0.0 0.0 2.5 4.5 — — — — — — — — – 6.0 0 7.0 0 Gain switching CTL holding voltage VHGM VHGL HPF, CTL holding voltage VHHPFH VHHPFL HPF OFF, 19pin DC HPF ON, 19pin DC 63→62 / 50→62 pin Gain differential for pins 63 to 62 and 50 to 62 MIX 1 gain GVM1-1 GVM1-2 GVM2-1 MIX 2 gain INT L / M / H, 2→57, 47→57pin Gain differential for pins 2 to 57 and 47 to 57 GVM2-2 5 Video ICs Parameter ZOOM - BALANCE Gain 1 Rch / Lch Symbol Min. Typ. Max. Unit Conditions BA7780KV 12→13 or 37→36 pin GV Z1-1 – 23.0 – 20.0 – 17.0 GV Z1-2 – 11.7 GV Z1-3 – 2.0 – 7.7 1.0 – 4.7 4.0 dB dB dB 29, 30 pin 0.0V (DC) 29, 30 pin 0.8V (DC) 29, 30 pin 2.2V (DC) ZOOM - BALANCE Gain 2 Rch / Lch 52→13 or 52→36 pin GVZ2-1 – 23.0 – 20.0 – 17.0 GV Z2-2 – 11.7 GVZ2-3 – 2.0 – 7.7 1.0 – 4.7 4.0 dB dB dB 29, 30 pin 2.2V (DC) 29, 30 pin 1.4V (DC) 29, 30 pin 0.0V (DC) 28 pin 0.8 × 4pin, 29 30 pin 1.1V, ZOOM - BALANCE Variable position Rch / Lch GV Z3–1 GV Z3–2 – 2.5 – 7.5 12→13 or 37→36 pin 0.5 – 4.5 3.5 – 1.5 dB dB dB 27 pin 0.64 × 4pin (DC) 27 pin 0.733 × 4pin (DC) 27 pin 0.82 × 4pin (DC) GV Z3–3 – 20.6 – 17.0 – 12.0 27 pin 0.733 × 4pin, 29 30 pin 0.4V, ZOOM - BALANCE Variable slope Rch / Lch GV Z4–1 GVZ4–2 – 5.5 – 9.5 12→13 or 37→36 pin – 2.5 – 6.5 0.5 – 3.5 dB dB dB dB dB dB 28 pin 0.59 × 4pin (DC) 28 pin 0.69 × 4pin (DC) 28 pin 0.8 × 4pin (DC) 51 pin 0.74 × 4pin (DC) 51 pin 0.58 × 4pin (DC) 51 pin 0.48 × 4pin (DC) GV Z4–3 – 17.5 – 14.5 – 11.5 Sub VCA gain 56pin 55pin GV VCA1 GV VCA2 GV VCA3 – 5.0 – 2.0 1.0 – 3.0 0.0 3.0 – 1.0 2.0 5.0 Note 1: Input switch crosstalk measurement method: (pin 19 = “H” or open, pin 26 = GND, pin 27 = 0.733 × pin 4, pin 28 = 0.80 × pin 4, pin 29 = 2.2V, pin 30 = 2.2V) Input 1kHz signals on the INT input pins (3 and 46) in INT input mode that give a distortion of 1% at the signal output pins (17 and 32), then connect the EXT input pins (5 and 44) to GND via Rg = 1kΩ Switch to EXT input mode, and measure the relative output level of the output pins (17 and 32). Note 2: Interchannel crosstalk measurement method: The mode pin conditions are the same as for input switch crosstalk. Connect the input pin of the channel to be measured to GND via Rg = 1kΩ. Input a 1kHz signal on the other channel's input that gives a distortion of 1% on the signal output pins (17 and 32), and measure the relative output level between the signal output pins (17 and 32). 6 MODE43 SW3 1 470p 2 Video ICs EXT MIC IN 30k 10k 10k 0.1 0.022 2200p 0.1 0.1 0.1 0.1 0.1 •Measurement circuit INT MIC IN 10 SUB MIC IN + 48 47 13dB 46 45 44 43 42 41 40 39 38 37 32 31 30 15dB RFLT INT BALANCE 5dB EXT 28 27 26 25 CImt 24 RFLT BALANCE 5dB INT HPFC 21 15dB MIX INT 63 0.1 13dB 64 01 0.1 02 0.1 03 04 REG EXT 13dB 05 0.1 06 07 08 09 10 11 0.1 12 13 14 15 16 GC INT: ON EXT 20 19 18 23 BIAS 22 MIX 29 36 35 34 33 –+ 49 0.1 REG INT 51 52 0.1 INT: ON 50 13dB EXT GC Lch OUT MIC MONO ZB ZA Z SENSE Z POINT GAIN CONT EX VCC OUT EX VCC IN VCC Z AC Z BC IN MONI HPF ON / OFF SUB BIAS GZ CONT + – SW1 53 10k 3 2 32k 1 54 10k 55 10k 56 0.1 57 58 0.1 59 60 61 0.1 62 Fig. 1 GND 10 +– Units: R [Ω] C [µF] 17 Rch OUT + 2200p 0.022 SUB MIC IN 0.1 30k 10k 10k 0.1 470p INT MIC IN EXT MIC IN 1 2 SW2 BA7780KV MODE6 7 Video ICs BA7780KV •Measurement circuit switching table (blank cells: no spesification) Parameter Current dissipation Voltage gain 1 Voltage gain 2 Voltage gain 3 Voltage gain 4 Distortion 1 Distortion 2 Distortion 3 Maximum output Output noise voltage 1 (EXT) Output noise voltage 2 (WIDE) Output noise voltage 3 (ZOOM) Input switch crosstalk (INT to EXT) INT EXT GC out L / R gain differential Inverter OUT L / R gain differential Internal microphone power supply voltage External power supply output voltage External power supply limit current Input switching CTL holding voltage SW1 1 — — — — 2 2 1 1 2 2 3 2 2 2 1 1 — — — 2 2 2 Gain switching CTL holding voltage 2 2 HPF, CTL holding voltage MIX 1 gain MIX 2 gain ZOOM - BALANCE Gain 1 ZOOM - BALANCE Gain 2 ZOOM - BALANCE Variable position ZOOM - BALANCE Variable inclination Sub VCA gain 2 — — 2 1 2 2 — SW2 1 — — — — — — — — — — — — — — — — — — — — — — — — 2.1 — — — — — — — SW3 1 — — — — — — — — — — — — — — — — — — — — — — — — 2.1 — — — — — — — MODE6 MODE43 GAIN CTL H, L L H — — H L H H, L L H H L H L H H — — — H Vth H H H H H H H H H H H H, L L — — — L L L L L L L L L L L L — — — Vth L L L L L L L L L L L L M M H M L M — M L — H H L M — H, M, L H, M, L — — — — — Vth Vth Vth — M — M M M M — Signal input pin — Ext Int Int Int Int Ext Sub Int, Ext, Sub — — — Int Int Ext Int Int — — — Int, Ext Int, Ext Int Int Int Int, Vth of pin 19 Int Sub Int Sub Int Int Sub Interchannel crosstalk ∗ Gain CTL pin 26. H, M, and L are VCC, 1/2VCC, and GND respectively. Measure the voltage range that maintains the mode for Vth. 8 Video ICs 0.022 3300 6800p 6800p 8200 33k 10k 0.1 3300 0.022 0.022 0.022 470p 12k 0.047 2200 6800 10k 2200p 0.1 0.1 0.1 0.1 22k 48 49 5600p REG INT: 0N INT 31 30 29 EXT 28 INT 54 BALANCE 5dB 10k 55 10k 56 0.1 MIX CImt 57 0.010 58 59 BALANCE 0.01 60 1500 61 0.1 62 MIX INT 63 2700p 0.1 13dB 64 10k 01 0.1 02 0.1 03 04 05 0.1 REG EXT 13dB 06 07 08 09 10 11 0.1 12 13 14 22k 10k 0.022 3300 0.1 2200 2200 6800 0.022 15 16 GC INT: 0N 6800p 10k 19 18 15dB EXT 1k RFLT 5dB INT HPFC 21 20 10k 24 23 BIAS 22 25 26 27 50 0.1 13dB EXT GC 13dB 47 46 45 44 43 42 41 40 39 38 37 32 36 35 34 33 10k 2200 10 •Application example EXT MIC IN INT MIC IN SUB MIC IN + –+ Lch OUT MIC MONO ZB ZA Z SENSE Z POINT GAIN CONT EX VCC OUT EX VCC IN VCC Z AC Z BC IN MONI HPF ON / OFF SUB BIAS GZ CONT 52 10k 47k RFLT 15dB 51 + – 53 3900p 0.1 Fig. 2 GND 10 +– 17 Rch OUT + 2200p 0.022 SUB MIC IN 33k 10k 0.047 12k 3300 6800p 6800p 8200 0.022 INT MIC IN Units: R [Ω] C [µF] EXT MIC IN 470p BA7780KV 9 Video ICs BA7780KV •Operation notes zoom operation Points to note regarding When using a microprocessor to vary the voltages on pins 29 and 30 after presetting the electronic volume sensitivity and control voltage range, and with the pin 27 and 28 voltage fixed at a certain level, it is possible to minimize drift in the zoom characteristics due to tempreature fluctuations and differences between individual ICs by setting the pin 27 and 28 voltages using resistive voltage divider circuits connected to the pin 4 regulator voltage output. 4 27 28 •Electrical characteristic curves 17, 32pin OUTPUT ATTENUATION LEVEL: GVZ1 (dB) 17, 32pin OUTPUT ATTENUATION LEVEL: GVZ1 (dB) Ta = 25°C 0 28pin 28pin 1.64V Ta = 25°C 0 Fig. 3 = –5 1.64V = –5 27pin 27pin 1.67V 1.87V 1.87V = – 10 1.84V 1.84V 1.67V – 10 – 15 1.94V 1.94V – 15 2.07V 1.67V – 20 2.04V 2.04V 12→13, 37→36pin 52→13, 52→36pin 0 0.1 0.6 1.1 1.6 2.1 2.2 – 20 12→13, 37→36pin 52→13, 52→36pin 0 0.1 0.6 1.1 1.6 2.1 2.2 29, 30pin CONTROL VOLTAGE: VCTL (V) 29, 30pin CONTROL VOLTAGE: VCTL (V) Fig. 4 Zoom control slope variation characteristics Fig. 5 Zoom control position variation characteristics •External dimensions (Units: mm) 12.0 ± 0.3 10.0 ± 0.2 48 12.0 ± 0.3 10.0 ± 0.2 49 33 32 64 1 16 17 1.4 ± 0.1 0.125 ± 0.1 0.10 0.5 0.2 ± 0.1 0.10 VQFP64 10 0.5 =