BA7665FS

Multimedia ICs 3-channel 75Ω driver with Y / C MIX BA7665FS The BA7665FS has three 75Ω driver circuits with 6dB amplifiers, and includes a Y / C MIX circuit. The IC can provide a 75Ω drive with a composite Y signal, C signal, or a Y / C MIX signal. Dual-circuit drive capacity for each load is provided, and a sag compensation function is provided to allow use of smaller coupling capacitors. The composite Y signal input is a sync-tip clamp input, and the chroma input is a biased input. The three channels can be simultaneously muted, or the chroma signal only (in the case of C / Y output, only Y is output), and output short circuit protection and power save circuits are also provided. •Applications Digital AV equipment, DVD and DVC players •Features circuit. 1) Y / C MIX 2) Low power consumption (typ. 130mW). 3) Output mute circuit. 4) Power save circuit. 5) Output protection circuit. 6) Sag compensation circuit allows small output coupling capacitors. 7) Two-circuit drive possible for loads. 8) Compact SSOP-A 16-pin package. •Absolute maximum ratings (Ta = 25°C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 8 650∗ – 25 ~ + 75 – 55 ~ + 125 Unit V mW °C °C ∗ Reduced by 6.5mW for each increase in Ta of 1°C over 25°C. •Recommended operating conditions (Ta = 25°C) Parameter Power supply voltage Not designed for radiation resistance. Symbol VCC Min. 4.5 Typ. 5.0 Max. 5.5 Unit V 1 Multimedia ICs BA7665FS •Block diagram MUTEA 1 Mute 16 VCC1 INA 2 6dB 75Ω 15 OUTA1 GND 3 14 OUTA2 GND 4 13 VCC2 GND 5 + 6dB 75Ω 12 MIXOUT1 N.C. 6 11 MIXOUT2 20k INB 7 6dB 75Ω 10 N.C. MUTEB 8 Chroma Mute 9 OUTB •Electrical characteristics (unless otherwise noted, Ta = 25°C, V Parameter Circuit current Maximum output level Frequency characteristics Inter channel crosstalk Mute attenuation Mute switch high level Mute switch low level Input impedance Symbol ICC Vom Gf CT MT VTHH VTHL ZIN Min. 13.0 2.6 – 1.0 — — 2.5 0 16 Typ. 26.0 3.0 0.0 – 60 – 60 — — 20 Max. 39.0 — 1.0 — — VCC 1.0 24 CC = 5V) Unit mA VP-P dB dB dB V V kΩ Chroma input pin (pin 7) No signal f = 1kHz, THD = 1 % f = 7MHz / 1MHz, 1VP-P f = 4.43MHz, 1VP-P f = 4.43MHz, 1VP-P Conditions 2 Multimedia ICs BA7665FS •Measurement circuit 3.3V 1 2 SW1 1.2V 3 1µF + 1 Mute SW16 1 16 2 A + 47µF 2 6dB 75Ω 15 100µF 3 14 + + 0.1µF 1 SW2 2 75Ω V 1µF 4 13 5 6dB 75Ω 12 100µF N.C. 1 0.1µF 2 3 3.3V 1 SW8 2 1.2V 3 V 0.1µF 8 Chroma Mute 9 SW7 7 6 20k 6dB 75Ω 10 N.C. 11 + + + 22µF + 75Ω V 0.1µF 22µF 75Ω V Fig.1 3 Multimedia ICs BA7665FS •Measurement conditions Parameter Circuit current OUTA Maximum output level MIXOUT OUTB OUTA Frequency characteristics MIXOUT OUTB Crosstalk OUTB→OUTA OUTA→OUTB OUTA Mute attenuation MIXOUT OUTB MIXOUT Chroma mute attenuation Input impedance OUTB — OUTA Voltage gain MIXOUT OUTB Inter-channel voltage gain differential — Symbol SW1 ICC VOM1 VOM2 VOM3 GF1 GF2 GF3 GT1 GT2 MT1 MT2 MT3 MTC1 MTC2 ZIN GV1 GV2 GV3 ∆GVC 2 3 3 3 3 3 3 3 3 1 1 1 3 3 3 3 3 3 — SW2 1 2 2 1 2 2 1 1 2 2 2 1 1 1 1 2 2 1 — Switch conditions SW7 1 1 1 2 1 1 2 2 1 1 1 2 2 2 3 1 1 2 — SW8 2 3 3 3 3 3 3 3 3 3 3 3 1 1 3 3 3 3 — SW16 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 — Note 8 Note 7 Note 5 Note 6 Note 5 Note 4 Note 3 Note 2 Measurement method Note 1 ∗ The mute switch level was substituted by using H = 2.4V and L = 1.1V for the above measurements. Measurement method Note 1: Measure the quiescent current. Note 2: Connect a distortion meter to the output, and input a f = 1kHz sine wave. Adjust the output level until the output distortion is 1%. The output voltage at this time is the maximum output level VOM [VP-P]. Note 3: Input 1VP-P, 7MHz and 1MHz sine waves, and measure the corresponding outputs VO7 and VO1. The frequency characteristic is given by GF = 20 ∗ Log (VO7 / VO1) [dB]. Note 4: Input a 1VP-P, 4.43MHz sine wave, and measure the output Vo [VP-P] The interchannel crosstalk is given by CT = 20 ∗ Log (VO / VIN) [dB]. Note 5: Input a 1VP-P, 4.43MHz sine wave, and measure the output Vo [VP-P] The mute attenuation is given by MT = 20 ∗ Log (VO / VIN) [dB]. Note 6: Measure the input pin voltage VIN50 when a current of DC50µA is flowing into the input pin. Measure the input pin open-circuit voltage. The input impedance is given by ZIN = | VIN50 – VIN0 | / 50 ∗ 103 [kΩ]. Note 7: Input a 1VP-P, 4.43MHz sine wave, and measure the output VO [VP-P] The voltage gain is given by Gv = 20 ∗ log (VO / VIN) [dB]. Note 8: ∆GVC = | GV1 – GV2 | [dB] 4 Multimedia ICs BA7665FS CC •Guaranteed design values (unless otherwise noted, Ta = 25°C, V Parameter Voltage gain Interchannel voltage gain Symbol Gv ∆Gv Min. 5.5 – 0.5 Typ. 6.0 0.0 Max. 6.5 0.5 = 5V) Conditions f = 4.43MHz, 1VP-P f = 100kHz, 1VP-P Unit dB dB • MUTEA (1pin) H L •Mute SW mode settings 3ch MUTE NORMAL • MUTEB (8pin) H L CHROMA MUTE NORMAL •Pin descriptions and equivalent I / O circuits Pin. No Pin name IN OUT Standard potential Equivalent I / O circuit Pin description Mute control pin 1 8 MUTEA MUTEB K — — 15k 8k When MUTE A (pin 1) goes high, all three channels are muted at the same time. When MUTE B (pin 8) goes high, OUTB and the MIXOUT chroma signals are muted. Signal input pin 2 INA K — 2.0V This is the input pin for the composite Y signal (sync-tip clamp input). ↓ Ground pin 3 4 5 GND — — 0V GND Signal input pin 7 INB K — 2.0V 20k ↓ Bias-type input pin for the chroma signal. The input impedance is 20kΩ. 5 Multimedia ICs BA7665FS Pin. No Pin name IN OUT Standard voltage Equivalent I / O circuit Pin description Signal output pin Chroma signal output pin. When this drops below 0.2V, the protection circuit operates and the IC enters power save mode. 9 OUTB — K 2.4V 11pin Signal output pin Y / C signal output pin. Pin 11 is the sag compensation pin. When pin 12 is taken below 0.2V, the protection circuit operates and the IC enters power save mode. 11 12 MIXOUT2 MIXOUT1 — K 0.9V 0.95V 12pin 14pin Signal output pin Composite Y signal output pin. Pin 14 is the sag compensation pin. When pin 15 is taken below 0.2V, the protection circuit operates and the IC enters power save mode. 14 15 OUTA2 OUTA1 — K 0.9V 0.95V 15pin Power supply pin 13 16 VCC2 VCC1 — — 5.0V 5.0V VCC VCC1 and VCC2 are not connected internally. Use with them connected externally. 6 Multimedia ICs BA7665FS •Application example 1 Mute 16 + 47µF 2 6dB 75Ω + Composite Y 1µF 15 + 0.1µF 75Ω 75Ω 100µF 3 14 22µF 4 13 75Ω 5 + 6dB 75Ω + + 12 75Ω 100µF N.C. 6 11 22µF Chroma 0.1µF 7 20k 6dB 75Ω 10 N.C. 75Ω 75Ω 0.1µF 8 Chroma Mute 9 When you will not use the sag compensation function 75Ω 1000µF 6dB 75Ω + + 75Ω Fig.2 7 Multimedia ICs BA7665FS •External dimensions (Units: mm) 6.6 ± 0.2 16 6.2 ± 0.3 4.4 ± 0.2 9 1.5 ± 0.1 1 8 0.11 0.8 0.36 ± 0.1 0.3Min. 0.15 SSOP-A16 8 0.15 ± 0.1