STV5725

STV5725 4-HEAD PLAYBACK AND RECORD AMPLIFIER FOR VCR . ONE 5V POWER SUPPLY . PLAYBACK/RECORD MODE SELECTION THROUGH A LOGIC INPUT . PINNING COMPATIBLE 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 COMPARATOR 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 commutation 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 60dB voltage gain. IOUTSP and IOUTLP Pins are AC short-circuited to ground. The input signal can be ...