STV5725

The STV5725 has the following features including ONE 5V POWER SUPPLY;PLAYBACWRECORD  MODE SELECTION THROUGH A LOGIC INPUT;PINNING COMPATIBLE WITH STV5727 AND STV5728;S020 PACKAGE.

STV5725 is intended for 4 heads VCR applications.STV5725 includes all the electricalfunctions necessary to achieve play-back and record processing for VHS applications.Record or Playback Mode can be selected through SWR Pin. SWH allows to select the video head input (H1 SP or H2SP, H1 LP or H2LP), while SWM will select the mode SP or LP.Signals applied on H1 SP, H2SP, H1 LP and H2LP input pins will be amplified by 60dB voltage gain.IOUTSP  and  IOUTLP  Pins are AC short-circuited to ground-The input signal can be selected through SWH and SWM inputs and the corresponding output signal will be available on Pin CPB.The offset voltage between the two selected heads is automatically cancelled after 32 switching head cycles.A constant output signal will be available on Pin YPB thanks to an AGC function (Automatic Gain Control). The time constant of the AGC is determined by the capacitor value connected to CAGC Pin. For Automatic Tracking, a signal which is a function of the selected input signal amplitude is present on Pin TRIV.The current input applied on RECIN Pin is amplified through a transconductanceamplifier. Special care has been taken to speed up commutation from Playback to Record and from Record to Playback,avoiding spikes through the loads (the rotary trans-formers).The recording current level in LP mode is 0.9 time the value of SP one.

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