The SAA4700 is a bipolar integrated circuit designed for use in dataline receivers and incorporates a dataline slicer and decoder. The slicer extracts the dataline signal from the video signal and regenerates the data clock. It also provides signals for the decoder in order to decode the binary data that is transmitted in line 16 of every first field of the composite video signal (video programming signal and video recording programming by Teletext, VPS and VPT systems). The decoded information out of words 5 and 11 to 14 is accessed via the built-in I2C-bus interface. This information then can be used for programming a video cassette recorder in order to start and stop a recording of a television program at the correct aligned time, regardless of a delay or extension in the transmission time of the required program.
The Philips SAA4700 is a bipolar integrated circuit designed for use in dataline receivers. It incorporates a dataline slicer and decoder to extract the dataline signal from the video signal and regenerate the data clock. The device provides signals for a decoder to decode binary data transmitted in line 16 of every first field of the composite video signal, supporting video programming for VPS and VPT systems.
The circuit features an adaptive sync slicer with buffered composite sync output, an adaptive data slicer, and a data rate clock regenerator. It includes a 40-bit register bank for storing data line information and a built-in I2C-bus interface to access decoded information for programming video cassette recorders.
| Supply voltage (pins 15 and 16) | 4.5 to 5.5 V |
|---|---|
| Total supply current | 18 to 23 mA |
| Operating ambient temperature | 0 to +70 °C |
| Storage temperature | -20 to 125 °C |
| Thermal resistance (junction to ambient) | 78 K/W |
| Package type | SOT102 |
It requires separate supply voltages for the analog and digital parts, with pins 15 and 16 tied together for operation.
The data available output is set LOW after an error-free dataline 16 is received.