BA7664FV

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 electronic cameras and others Video cameras, •Features 8-pin SSOP-B package is used. 1) The compact 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 Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 8 350 – 25 ~ + 75 – 55 ~ + 125 Unit V mW °C °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 VCC Min. 4.5 Typ. 5.0 Max. 5.5 Unit V ∗Not designed for radiation resistance. 1 Multimedia ICs BA7664FV •Block diagram MUTE MUTEA 1 8 VCC YIN 2 + 6dB 75Ω 7 OUT1 GND 3 6 OUT2 20k CHROMA MUTE CIN 4 5 MUTEB 2 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 — — 15k 14k 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.) 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 0.9V 0.95V 7pin 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. Power supply VCC 8 VCC — — 5.0V 3 Multimedia ICs BA7664FV CC •Electrical characteristics (unless otherwise noted, Ta = 25°C, V Parameter Circuit current Max. output level Voltage gain Frequency characteristic Muting attenuation Muting switching high level Muting switching low level Input impedance Circuit current when muted Symbol ICC Vom GV GF MT VTHH VTHL ZIN IMUTE Min. 6.1 2.6 – 1.0 – 1.5 — 2.2 0 16 — Typ. 12.2 3.0 – 0.2 – 0.5 – 60 — — 20 1.3 = 5V) Max. 18.3 — 0.6 0.5 — VCC 0.7 24 2.6 Unit mA VP-P dB dB dB V V kΩ mA Conditions With no signal f = 1kHz,THD = 1%V02 f = 4.43MHz / V01 f = 7MHz / 1MHz,1VP-P / V01 f = 4.43MHz,1VP-P / V01 — — Chrominance input pin (pin 7) MUTEA “H” •Guaranteed design parameters (unless otherwise noted, Ta = 25°C, V Parameter Differential gain Differential phase Symbol DG DP Min. — — Typ. 1.0 0.5 Max. 2.0 2.0 Unit % DEG CC = 5V) Conditions VIN = 1.0VP-P reference staircase signal VIN = 1.0VP-P reference staircase signal •Mute switch mode settings • MUTEA (1pin) H L MUTE NORMAL • MUTEB (5pin) H L CHROMA MUTE NORMAL 4 Multimedia ICs BA7664FV •Measurement circuit 2.1V 1 2 SW1 3 1µF 1µF + + MUTE 1 8 SW16 1 2 A + 0.8V 47µ 0.1µ 1 2 SW2 2 100µ + 6dB 75Ω 7 + 75 V02 V01 2.5V 3 6 + 150 3 22µ 75 0.1µF 1 0.1µF 2 3 V SW4 4 20k CHROMA MUTE 5 SW5 1 2 3 2.1V 0.8V Fig.1 •Measurement conditions Parameter Circuit current Max. output level Voltage gain Y→OUT C→OUT Frequency characteristic Muting attenuation Chroma muting attenuation Input impedance Circuit current when muted Symbol 1 ICC VOM GV1 GV2 GF MT MTC ZIN IMUTE 2 3 3 3 3 1 3 3 1 2 1 2 2 3 1 2 3 1 1 SW Conditions 4 1 1 1 2 2 1 2 3 1 5 2 3 3 3 3 3 1 3 2 8 1 2 2 2 2 2 2 2 1 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 1 8 + 47µF 0.1µF 75Ω 75Ω 1µF + 100µF 2 Composite Y + 6dB 75Ω 7 3 6 0.1µF Chroma 4 20k CHROMA MUTE 5 Fig.2 MUTE 1 Open or GND 1µF + 8 + + + 22µF 47µF 0.1µF 75Ω 75Ω 1000µF 2 Composite Y + 6dB 75Ω 7 3 6 0.1µF Chroma 4 20k CHROMA MUTE 5 Open or GND Fig.3 6 + Multimedia ICs BA7664FV •External dimensions (Units: mm) 3.0 ± 0.2 8 6.4 ± 0.3 4.4 ± 0.2 5 1.15 ± 0.1 1 0.1 4 (0.52) 0.65 0.22 ± 0.1 0.3Min. 0.1 SSOP-B8 0.15 ± 0.1 7