1 multimedia ics 75 w driver with y / c mix circuit ba7664fv the ba7664fv is a 75 w driver with a 6db amplifier and a y / c mix circuit. the 75 w driver is capable of driving a load sufficient for two circuits, as well as being equipped with a sag correction function which reduces the capaci- tance of the output coupling capacitor. the ic comes in the compact 8-pin ssop-b package. the composite y sig- nal input pin is sync chip clamped input, while the chrominance input pin is bias input. an internal power-saving cir- cuit is also included which provides an output muting function and output pin shorting protection. applications video cameras, electronic cameras and others features 1) the compact 8-pin ssop-b package is used. 2) operates at a low power consumption (60mw typ.). 3) internal y / c mix circuit. 4) internal output muting circuit. 5) 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?) parameter symbol limits unit power supply voltage power dissipation operating temperature storage temperature v cc pd t opr t stg 8 350 ?25 ~ + 75 ?55 ~ + 125 v mw c c * reduced by 3.5mw for each increase in ta of 1 c over 25 c recommended operating conditions (ta = 25?) parameter symbol unit max. typ. min. operating power supply voltage v cc 4.5 5.5 5.0 v * not designed for radiation resistance.
2 multimedia ics ba7664fv block diagram + 6db 75 w 20k mutea 1 y in 2 gnd 3 c in 4 v cc 8 out1 7 out2 6 muteb 5 mute chroma mute
3 multimedia ics ba7664fv pin descriptions and input / output circuits pin. no pin name in out reference potential equivalent circuit pin description mutea muteb k k 2.0v 0v 1 5 2 3 y in gnd muting control 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 this is the input pin for composite y signals, and is sync chip clamped input. ground 15k 14k gnd 4c in k 2.0v k 0.9v 0.95v 6 7 mixout2 mixout1 5.0v 8v cc signal input this is the input pin for chrominance signals, and is bias-type input. the input impedance is 20k w . signal output 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 6pin 20k 7pin v cc
4 multimedia ics ba7664fv electrical characteristics (unless otherwise noted, ta = 25?, v cc = 5v) parameter symbol min. typ. max. unit conditions 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 i cc v om g v g f m t v thh v thl z in i mute 6.1 2.6 ?1.0 ?1.5 2.2 0 16 12.2 3.0 ?0.2 ?0.5 ?60 20 1.3 18.3 0.6 0.5 v cc 0.7 24 2.6 ma v p-p db db db v v k w ma with no signal f = 1khz,thd = 1%v 02 f = 4.43mhz / v 01 f = 7mhz / 1mhz,1v p-p / v 01 f = 4.43mhz,1v p-p / v 01 chrominance input pin (pin 7) mutea ? guaranteed design parameters (unless otherwise noted, ta = 25?, v cc = 5v) parameter symbol min. typ. max. unit conditions differential gain differential phase dg dp 1.0 0.5 2.0 2.0 % deg v in = 1.0v p-p reference staircase signal v in = 1.0v p-p reference staircase signal mute switch mode settings mute ?mutea (1pin) h normal l chroma mute ?muteb (5pin) h normal l
5 multimedia ics ba7664fv measurement circuit 6db 75 w + 20k 1 2 3 4 8 7 6 5 mute chroma mute v + + + 100 m 22 m 0.1 m v 02 v 01 47 m sw16 1 2 150 75 75 2.1v 0.8v 1 2 3 sw5 2.1v 0.8v 1 2 1 2 3 2.5v 3 sw1 sw2 + + 1 m f 1 m f 1 2 3 0.1 m f 0.1 m f sw4 a fig.1 measurement conditions parameter symbol measurement method sw conditions circuit current max. output level voltage gain y ? out c ? out frequency characteristic muting attenuation chroma muting attenuation input impedance circuit current when muted i cc v om g v1 g v2 g f m t m tc z in i mute * 1 * 2 * 3 * 3 * 4 * 5 * 5 * 6 * 7 1 2 3 3 3 3 1 3 3 1 2 1 2 2 3 1 2 3 1 1 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 * 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 v om [v p-p ]. * 3 measure the output v o [v p-p ] with a sine wave of f = 4.43mhz, 1v p-p applied to the input. voltage gain g v is: g v = 20 log (v o / v in ) [db] * 4 measure the outputs v o7 and v o1 [v p-p ] each with sine waves of f = 7mhz, 1v p-p and f = 1mhz, 1v p-p applied to the input. voltage frequency g f is: g f = 20 log (v o7 / v o1 ) [db] * 5 measure the output v o [v p-p ] with a sine wave of f = 4.43mhz, 1v p-p applied to the input. the muting attenuation m t is: m t = 20 log (v o / v in ) [db] * 6 measure the input voltage v inso [v] and the open voltage of the input v ino [v] when 50 m a is introduced. the input impedance z in is: z in = |v inso ?v ino | / 50 1000 [k w ] * 7 measure the circuit current when mutea (pin 1) is high.
6 multimedia ics ba7664fv application examples + 6db mute 75 w 20k chroma mute + + 75 w 75 w 100 m f 22 m f + 47 m f 0.1 m f 1 m f 0.1 m f 1 2 3 4 8 7 6 5 + composite y chroma fig.2 + 6db mute 75 w 20k chroma mute + 75 w 75 w 1000 m f + 47 m f 1 m f 0.1 m f 0.1 m f 1 2 3 4 8 7 6 5 + composite y open or gnd open or gnd chroma fig.3
7 multimedia ics ba7664fv ssop-b8 0.1 0.22 0.1 0.65 0.3min. 5 4 8 1 6.4 0.3 4.4 0.2 3.0 0.2 1.15 0.1 0.15 0.1 0.1 (0.52) external dimensions (units: mm)
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