STV5725 Datasheet | STMicroelectronics

4-HEAD PLAYBACK AND RECORD AMPLIFIER FOR VCR . ONE 5V POWER SUPPLY . PLAYBACK/RECORD MODE SELECTION THROUGH A LOGIC INPUT . PINNING PATIBLE WITH STV5727 AND STV5728 . SO20 PACKAGE PLAYBACK MODE . LOW NOISE AND WIDE BAND AMPLIFIERS FOR 4 HEADS . AUTOMATIC OFFSET CANCELLATION BETWEEN THE 2 SELECTED HEADS . ONE PLAYBACK OUTPUT WITH AGC . ONE PLAYBACK OUTPUT (CONSTANT GAIN) . ONE OUTPUT FOR AUTOMATIC VIDEO TRACKING . SP/LP ENVELOPE PARATOR OUTPUT .RECORD MODE TRANSCONDUCTANCE AMPLIFIER PRELIMINARY DATA function of the selected input signal amplitude is present on Pin TRIV. Record Mode The current input applied on RECIN Pin is amplified through a transconductanceamplifier. Special care has been taken to speed up mutation from Playback to Record and from Record to Playback, avoiding spikes through the loads (the rotary transformers). The recording current level in LP mode is 0.9 time the value of SP one. SO20 (Plastic Micropackage) DESCRIPTION STV5725 is intended for 4 heads VCR applications. It includes all the electrical functions 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 (H1SP or H2SP, H1LP or H2LP), while SWM will select the mode SP or LP. Playback Mode Signals applied on H1SP, H2SP, H1LP and H2LP input pins will be amplified by 60d B 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 ORDER CODE : STV5725 PIN CONNECTIONS H1SP...