Multimedia ICs 3-channel 75Ω driver BA7660FS The BA7660FS is a 75Ω driver with a 6dB amplifier and three internal circuits, and provides 75Ω drive of composite Y signals and C signals, as well as RGB signals. Each load is capable of driving two circuits, and a sag correction function reduces the capacitance of the output coupling capacitor. The input voltage is within a range of 0V to 1.5V, enabling direct connection of ordinary D / A converter output. An internal power-saving circuit is also included which provides simultaneous muting on all three channels, and output pin shorting protection. Applications •DVDs, set top boxes and other digital video devices •1)Features Can be coupled directly to D / A converter output. 6) An internal sag correction function makes it possible to reduce the capacitance of the output coupling capacitor. 7) Each load is capable of driving two circuits. 8) The compact 16-pin SSOP-A package is used. 2) Operates at a low power consumption (115mW typ.). 3) Internal output muting circuit. 4) Internal power-saving circuit. 5) Internal output protection circuit. •Absolute maximum ratings (Ta = 25°C) Parameter Symbol Power supply voltage Vcc 8 V Power dissipation Pd 650 mW Operating temperature Topr – 25 ~ + 75 °C Storage temperature Tstg – 55 ~ + 125 °C Limits Unit •Recommended operating conditions (Ta = 25°C) Parameter Operating power supply voltage Symbol Min. Typ. Max. Unit Vcc 4.5 5.0 5.5 V 1 Multimedia ICs BA7660FS •Block diagram MUTE 1 2 16 VCC INA 2 GND 3 INB 4 GND 5 12 OUTB2 N.C. 6 11 N.C. INC 7 GND 8 6dB 75Ω 15 OUTA1 14 OUTA2 6dB 6dB 75Ω 75Ω 13 OUTB1 10 OUTC1 9 OUTC2 MUTE (1pin) H 3ch MUTE L NORMAL Multimedia ICs BA7660FS •Pin descriptions and input / output circuits Pin. No Pin name IN OUT Reference voltage Equivalent circuit Function Muting control 1 MUTE K — 15k — If MUTE (pin 1) is set to HIGH, muting is carried out simultaneously on all three channels. 8k Signal input 2 4 7 INA INB INC K — — 3 5 8 GND — — 0V 14 12 9 OUTA2 OUTB2 OUTC2 15 13 10 OUTA1 OUTB1 OUTC1 16 VCC Input video RGB, within (typ.). signals consist of composite signals, Y signals, C signals, and others. The input level is a range of 0 to 1.3 (min.) to 1.5 Ground GND 0.9V — Signal output 14pin 12pin 9pin The signal output level is (0.9 + 2 × input voltage [V]). Pins 9, 12, and 14 are the pins for sag correction. If pins 10, 13, and 15 are set to 0.2V or less, the protective circuit is triggered and the power-saving mode is accessed. K 0.95V 15pin 13pin 10pin Vcc — — 5.0V Power supply 3 Multimedia ICs BA7660FS •Electrical characteristics (unless otherwise noted, Ta = 25°C, V CC Parameter Symbol Min. Typ. Max. Circuit current = 5V) Unit Conditions ICC 11.4 22.8 34.2 mA With no signal Vom 2.6 3.0 — VP- P f = 1kHz,THD = 1% Voltage gain GV 5.5 6.0 6.5 dB f = 4.43MHz,1VP- P Frequency characteristic Gf – 1.0 0.0 1.0 dB f = 7MHz / 1MHz,1VP- P Muting attenuation MT — – 60 — dB f = 4.43MHz,1VP- P Muting switching level HIGH VTHH 3.5 — VCC V — Muting switching level LOW VTHL 0 — 1.0 V — Maximum output level •Guaranteed design parameters (unless otherwise noted, Ta = 25°C, V CC Parameter Symbol Min. Typ. Max. = 5V) Unit Conditions Differential gain DG — 0.5 1.5 % 1.0VP- P reference staircase signal Differential phase DP — 0.5 1.5 deg 1.0VP- P reference staircase signal Interchannel crosstalk CT — – 60 – 55 dB f = 4.43MHz,1VP- P – 0.5 0.0 0.5 dB f = 4.43MHz,1VP- P Interchannel voltage gain differential ∆GV •Measurement circuit VCC 3.3V 1 2 SW1 SW16 1 1.2V 1 16 0.1µF 1µF 1 1µF SW2 430k 2 75k 2 6dB 75Ω 15 3 SW4 430k 2 75k 6dB 75Ω 13 75Ω 5 12 6 11 N.C. 100µF SW7 7 6dB 75Ω 10 75Ω 22µF 75k 8 4 V 22µF N.C. 430k 2 V 100µF 4 1 1µF 75Ω 14 1 1µF 47µF 100µF 22µF 1µF 1µF A 2 3 9 V Multimedia ICs BA7660FS •Measurement condition settings table Item Circuit current Maximum output level Voltage gain Frequency characteristics Switch conditions SW1 SW2 SW4 SW7 SW16 Measurement method Note 1 Symbol ICC 2 1 1 1 1 OUTA VOM1 3 2 1 1 2 OUTB VOM2 3 1 2 1 2 OUTC VOM3 3 1 1 2 2 OUTA GV1 3 2 1 1 2 OUTB GV2 3 1 2 1 2 OUTC GV3 3 1 1 2 2 OUTA GF1 3 2 1 1 2 OUTB GF2 3 1 2 1 2 OUTC GF3 3 1 1 2 2 OUTA→OUTB CT1 3 2 1 1 2 OUTA→OUTC CT2 3 2 1 1 2 Crosstalk between OUTB→OUTA CT3 3 1 2 1 2 channels OUTB→OUTC CT4 3 1 2 1 2 OUTC→OUTA CT5 3 1 1 2 2 OUTC→OUTB CT6 3 1 1 2 2 OUTA MT1 1 2 1 1 2 OUTB MT2 1 1 2 1 2 OUTC MT3 1 1 1 2 2 Muting attenuation Note 2 Note 3 Note 4 Note 5 Note 6 ∗ The muting switching level is substituted by carrying out the above measurement at High = 3.3V, Low = 1.2V. Note 1: Measure the circuit current when no signal is present. Note 2: Apply a sine wave of f = 1kHz to the input, and adjust the input level so that the output distortion is 1%. At this time, set the output voltage to the maximum output level of VOM [VP-P]. Note 3: Measure the output VO [VP-P] with a sine wave of f = 4.43MHz, 1VP-P applied to the input. Voltage gain GV is: GV = 20 Log (VO / VIN) [dB] Note 4: Measure the outputs VO7 and VO1 [VP-P] each with sine waves of f = 7MHz, 1VP-P and f = 1MHz, 1VP-P applied to the input. Voltage frequency GF is: GF = 20 Log (VO7 / VO1) [dB] Note 5: Measure the output VO [VP-P] with a sine wave of f = 4.43MHz, 1VP-P applied to the input. Interchannel crosstalk CT is: CT = 20 Log (VO / VIN) [dB] Note 6: Measure the output VO [VP-P] with a sine wave of f = 4.43MHz, 1VP-P applied to the input. The muting attenuation MT is: MT = 20 ∗ Log (VO / VIN) [dB] 5 Multimedia ICs BA7660FS •Application example 5V Vcc 0.1µF 1 MUTE Composite Video D/A 2 6dB 75Ω + 47µF 16 1000µF + 15 75Ω 75Ω 3 Composite Y D/A 4 14 6dB 75Ω 1000µF + 13 75Ω 75Ω N.C. D/A Chroma 5 12 6 11 7 6dB 75Ω 10 N.C. 1000µF + 75Ω 75Ω 8 9 When the sag correction function is used. 6dB •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 6 75Ω 100µF + 75Ω 22µF + 75Ω