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 •1)Features Y / C MIX circuit. 6) Sag compensation circuit allows small output coupling capacitors. 7) Two-circuit drive possible for loads. 8) Compact SSOP-A 16-pin package. 2) Low power consumption (typ. 130mW). 3) Output mute circuit. 4) Power save circuit. 5) Output protection circuit. •Absolute maximum ratings (Ta = 25°C) Parameter Symbol Limits Unit Power supply voltage VCC 8 V mW Pd 650∗ Operating temperature Topr – 25 ~ + 75 °C Storage temperature Tstg – 55 ~ + 125 °C Power dissipation ∗ Reduced by 6.5mW for each increase in Ta of 1°C over 25°C. •Recommended operating conditions (Ta = 25°C) Parameter Symbol Min. Typ. Max. Unit VCC 4.5 5.0 5.5 V Power supply voltage 䊊 Not designed for radiation resistance. 1 Multimedia ICs BA7665FS •Block diagram Mute 16 VCC1 MUTEA 1 INA 2 GND 3 14 OUTA2 GND 4 13 VCC2 GND 5 N.C. 6 INB 7 MUTEB 8 6dB + 75Ω 6dB 75Ω 15 OUTA1 12 MIXOUT1 11 MIXOUT2 20k 6dB 75Ω 10 N.C. 9 OUTB Chroma Mute •Electrical characteristics (unless otherwise noted, Ta = 25°C, V CC Parameter = 5V) Symbol Min. Typ. Max. Unit Circuit current ICC 13.0 26.0 39.0 mA No signal Maximum output level Vom 2.6 3.0 — VP-P f = 1kHz, THD = 1 % Frequency characteristics Gf – 1.0 0.0 1.0 dB f = 7MHz / 1MHz, 1VP-P Inter channel crosstalk CT — – 60 — dB f = 4.43MHz, 1VP-P f = 4.43MHz, 1VP-P MT — – 60 — dB Mute switch high level VTHH 2.5 — VCC V Mute switch low level VTHL 0 — 1.0 V ZIN 16 20 24 kΩ Mute attenuation Input impedance 2 Conditions Chroma input pin (pin 7) Multimedia ICs BA7665FS •Measurement circuit 3.3V 1 2 SW1 1.2V SW16 1 Mute 1 2 3 + 6dB 2 75Ω 15 1 100µF 75Ω 14 3 22µF 1µF 13 4 + 5 6dB 75Ω 12 + + 2 V + + SW2 0.1µF + 47µF 100µF V 75Ω N.C. 0.1µF 22µF 1 20k SW7 0.1µF 11 6 + 1µF A 16 2 6dB 7 75Ω 10 N.C. V 3 0.1µF 3.3V 9 8 Chroma Mute 1 V SW8 75Ω 2 1.2V 3 Fig.1 3 Multimedia ICs BA7665FS •Measurement conditions Parameter Circuit current Maximum output level Frequency characteristics Crosstalk Mute attenuation Chroma mute attenuation Input impedance Voltage gain Inter-channel voltage gain differential Switch conditions SW1 SW2 SW7 SW8 SW16 Measurement method Note 1 Symbol ICC 2 1 1 2 1 OUTA VOM1 3 2 1 3 2 MIXOUT VOM2 3 2 1 3 2 OUTB VOM3 3 1 2 3 2 OUTA GF1 3 2 1 3 2 MIXOUT GF2 3 2 1 3 2 OUTB GF3 3 1 2 3 2 OUTB→OUTA GT1 3 1 2 3 2 OUTA→OUTB GT2 3 2 1 3 2 OUTA MT1 1 2 1 3 2 MIXOUT MT2 1 2 1 3 2 OUTB MT3 1 1 2 3 2 MIXOUT MTC1 3 1 2 1 2 OUTB MTC2 3 1 2 1 2 — ZIN 3 1 3 3 2 OUTA GV1 3 2 1 3 2 MIXOUT GV2 3 2 1 3 2 OUTB GV3 3 1 2 3 2 — ∆GVC — — — — — Note 2 Note 3 Note 4 Note 5 Note 5 Note 6 Note 7 Note 8 ∗ 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 •Guaranteed design values (unless otherwise noted, Ta = 25°C, V CC Parameter Voltage gain Interchannel voltage gain = 5V) Symbol Min. Typ. Max. Unit Gv 5.5 6.0 6.5 dB f = 4.43MHz, 1VP-P – 0.5 0.0 0.5 dB f = 100kHz, 1VP-P ∆Gv •Mute SW mode settings • MUTEA (1pin) Conditions • MUTEB (8pin) H 3ch MUTE H CHROMA MUTE L NORMAL L 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 — — 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. 15k 8k 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 Pin. No Pin name IN BA7665FS OUT Standard voltage Equivalent I / O circuit Pin description Signal output pin 9 11 12 14 15 OUTB MIXOUT2 MIXOUT1 OUTA2 OUTA1 — — — K K K Chroma signal output pin. When this drops below 0.2V, the protection circuit operates and the IC enters power save mode. 2.4V 11pin Signal output pin 12pin 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. 14pin Signal output pin 0.9V 0.95V 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. 0.9V 0.95V 15pin Power supply pin 13 16 6 VCC2 VCC1 — — 5.0V 5.0V VCC VCC1 and VCC2 are not connected internally. Use with them connected externally. Multimedia ICs BA7665FS •Application example Mute 1 16 + 47µF 0.1µF 1µF 6dB + 2 75Ω 75Ω + Composite Y 15 75Ω 3 + 100µF 14 22µF 4 13 6dB 75Ω + 75Ω + 5 12 75Ω N.C. 6 + 100µF 11 22µF 20k 0.1µF 6dB 7 75Ω 10 N.C. 0.1µF 8 9 75Ω 75Ω Chroma Mute When you will not use the sag compensation function 75Ω 1000µF 6dB 75Ω + Chroma 75Ω Fig.2 7 Multimedia ICs BA7665FS •External dimensions (Units: mm) 1 8 4.4 ± 0.2 9 0.8 0.15 ± 0.1 1.5 ± 0.1 0.11 6.2 ± 0.3 6.6 ± 0.2 16 0.36 ± 0.1 0.3Min. 0.15 SSOP-A16 8