STV5725 Datasheet | STMicroelectronics

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 GNDSP H2SP IOUTSP C IOUTLP H2LP GNDLP H1LP 1 2 3 4 5 6 7 8 9 10 20 SWR 19 SWIN 18 VCC 17 RECIN 16 CPB 15 GND 14 YPB 13 TRIV 12 ENV 11 CAGC April 1996 This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without no tice. 1/7 5725-01.EPS BLOCK DIAGRAM H1 S P 1 60d B 3 H2 S P SP HEADS 4 6 LP HEADS 7 H2LP 60d B 60d B 9 H1LP 60d B S TV5725 H2LP H1LP H1 S P H2 S P Re cord Amplifica tor 20 22kΩ 19 8.2kΩ +5V 18 Rrcy 17 Rrcc Playback 15...