Multimedia ICs 75Ω driver with Y / C MIX circuit BA7664FV The BA7664FV is a 75Ω driver with a 6dB amplifier and a Y / C MIX circuit. The 75Ω driver is capable of driving a load sufficient for two circuits, as well as being equipped with a sag correction function which reduces the capacitance of the output coupling capacitor. The IC comes in the compact 8-pin SSOP-B package. The composite Y signal input pin is sync chip clamped input, while the chrominance input pin is bias input. An internal power-saving circuit is also included which provides an output muting function and output pin shorting protection. Applications •Video cameras, electronic cameras and others •1)Features The compact 8-pin SSOP-B package is used. 2) 3) 4) 5) Operates at a low power consumption (60mW Typ.). Internal Y / C MIX circuit. Internal output muting circuit. Internal power-saving circuit. 6) Internal output protection circuit. 7) Internal sag correction function makes it possible to reduce the capacitance of the output coupling capacitor. 8) A load sufficient for two circuits can be driven. •Absolute maximum ratings (Ta = 25°C) Parameter Symbol Limits Unit Power supply voltage VCC 8 V Power dissipation Pd 350 mW Operating temperature Topr – 25 ~ + 75 °C Storage temperature Tstg – 55 ~ + 125 °C ∗ Reduced by 3.5mW for each increase in Ta of 1°C over 25°C •Recommended operating conditions (Ta = 25°C) Parameter Operating power supply voltage Symbol Min. Typ. Max. Unit VCC 4.5 5.0 5.5 V ∗Not designed for radiation resistance. 1 Multimedia ICs BA7664FV •Block diagram MUTE MUTEA 1 YIN 2 GND 3 + 6dB 75Ω 8 VCC 7 OUT1 6 OUT2 5 MUTEB 20k CHROMA MUTE CIN 2 4 Multimedia ICs BA7664FV •Pin descriptions and input / output circuits Pin. No Pin name IN OUT Reference potential Equivalent circuit Pin description Muting control 1 5 MUTEA MUTEB K — If MUTEA (pin 1) is set to HIGH, the output is muted. If MUTEB (pin 8) is set to HIGH, only the chrominance signal is muted. (The Y signal is output without being muted.) 15k — 14k Signal input 2 YIN K — 2.0V ↓ This is the input pin for composite Y signals, and is sync chip clamped input. Ground 3 GND — — 0V GND Signal input 4 CIN K — 2.0V 20k ↓ This is the input pin for chrominance signals, and is bias-type input. The input impedance is 20kΩ. Signal output 6pin 6 7 MIXOUT2 MIXOUT1 — K These are the Y / C MIX signal output. Pin 6 is the pin for sag correction. If pin 7 is set to 0.2V or less, the protective circuit is triggered and the power-saving mode is accessed. 0.9V 0.95V 7pin Power supply VCC 8 VCC — — 5.0V 3 Multimedia ICs BA7664FV •Electrical characteristics (unless otherwise noted, Ta = 25°C, V CC Parameter = 5V) Symbol Min. Typ. Max. Unit Conditions Circuit current ICC 6.1 12.2 18.3 mA With no signal Max. output level Vom 2.6 3.0 — VP-P f = 1kHz,THD = 1%V02 Voltage gain GV – 1.0 – 0.2 0.6 dB f = 4.43MHz / V01 Frequency characteristic GF – 1.5 – 0.5 0.5 dB f = 7MHz / 1MHz,1VP-P / V01 f = 4.43MHz,1VP-P / V01 MT — – 60 — dB Muting switching high level VTHH 2.2 — VCC V Muting switching low level VTHL 0 — 0.7 V ZIN 16 20 24 kΩ Chrominance input pin (pin 7) IMUTE — 1.3 2.6 mA MUTEA “H” Muting attenuation Input impedance Circuit current when muted •Guaranteed design parameters (unless otherwise noted, Ta = 25°C, V CC Parameter — — = 5V) Symbol Min. Typ. Max. Unit Differential gain DG — 1.0 2.0 % VIN = 1.0VP-P reference staircase signal Differential phase DP — 0.5 2.0 DEG VIN = 1.0VP-P reference staircase signal •Mute switch mode settings • MUTEA (1pin) 4 • MUTEB (5pin) H MUTE H CHROMA MUTE L NORMAL L NORMAL Conditions Multimedia ICs BA7664FV •Measurement circuit 2.1V 1 2 SW1 0.8V SW16 1 MUTE 1 A 8 2 + 3 1µF 0.1µ 47µ + 1 1µF 100µ + 2 + 6dB 75Ω 7 V02 75 + SW2 2 V01 150 2.5V 75 22µ 3 + 3 6 2.1V 0.1µF 1 20k SW4 0.1µF 2 3 CHROMA MUTE 1 SW5 4 5 2 V 0.8V 3 Fig.1 •Measurement conditions Parameter Circuit current 1 2 4 5 8 ICC 2 1 1 2 1 VOM 3 2 1 3 2 Y→OUT GV1 3 2 1 3 2 C→OUT Max. output level Voltage gain SW Conditions Symbol GV2 3 3 2 3 2 Frequency characteristic GF 3 1 2 3 2 Muting attenuation MT 1 2 1 3 2 Chroma muting attenuation MTC 3 3 2 1 2 Input impedance ZIN 3 1 3 3 2 IMUTE 1 1 1 2 1 Circuit current when muted Measurement method ∗1 ∗2 ∗3 ∗3 ∗4 ∗5 ∗5 ∗6 ∗7 ∗ The muting switching level is substituted by carrying out the above measurement at H = 2.1V, L = 0.8V. Measurement method ∗1 Measure the circuit current when no signal is present. ∗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]. ∗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] ∗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] ∗5 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] ∗6 Measure the input voltage VINSO [V] and the open voltage of the input VINO [V] when 50µA is introduced. The input impedance ZIN is: ZIN = |VINSO – VINO| / 50 × 1000 [kΩ] ∗7 Measure the circuit current when MUTEA (pin 1) is HIGH. 5 Multimedia ICs BA7664FV •Application examples MUTE 8 1 47µF + 75Ω 1µF + 2 6dB 75Ω 7 + 100µF + Composite Y 0.1µF 75Ω 20k 0.1µF Chroma 6 + 22µF 3 CHROMA MUTE 4 5 Fig.2 MUTE 1 8 + 47µF 0.1µF Open or GND 75Ω 1µF + 2 6dB 75Ω 3 75Ω 6 20k 0.1µF Chroma 7 + 1000µF + Composite Y CHROMA MUTE 4 5 Open or GND Fig.3 6 Multimedia ICs BA7664FV •External dimensions (Units: mm) 8 5 1 4 (0.52) 0.15 ± 0.1 4.4 ± 0.2 0.1 1.15 ± 0.1 6.4 ± 0.3 3.0 ± 0.2 0.65 0.22 ± 0.1 0.3Min. 0.1 SSOP-B8 7