STV5727 Datasheet | STMicroelectronics

2-HEAD PLAYBACK AND RECORD AMPLIFIER FOR VCR . ONE 5V POWER SUPPLY . PLAYBACK/RECORD MODE SELECTION THROUGH A LOGIC INPUT . PINNING PATIBLE WITH STV5725 AND STV5728 . SO14 PACKAGE .....PLAYBACK MODE LOW NOISE AND WIDE BAND AMPLIFIERS AUTOMATIC OFFSET CANCELLATION ONE PLAYBACK OUTPUT WITH AGC ONE PLAYBACK OUTPUT (CONSTANT GAIN) ONE OUTPUT FOR AUTOMATIC TRACKING WITH GAIN SWITCH .RECORD MODE TRANSCONDUCTANCE AMPLIFIER PRELIMINARY DATA 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). SO14 (Plastic Micropackage) ORDER CODE : STV5727 DESCRIPTION STV5727 is intended for 2 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. Playback Mode Signals applied on H1 and H2 input pins will be amplified by 60d B voltage gain. IOUTSP Pin is AC short-circuited to ground by C. The input signal can be selected through SWIN Pin and the correspondingoutput signal will be available on Pin CPB. The offset voltage between the two 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. According to the voltage level on SWIN Pin, the triv gain can be change. PIN CONNECTIONS H1 GND1 H2 IOUTSP C CAGC TRIV 1 2 3 4 5 6 7 14 13 12 11 10 9 8 April 1996 This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without no tice. SWR SWIN VCC...