5002R Datasheet, PDF (20/30 Pages) Teridian Semiconductor Corporation – Dual SCART A/V Switch

AVPro® 5002R
Dual SCART A/V Switch
DATA SHEET
Applications Information
Function Pin Control
The AVPro® 5002R controls the output voltage of the Aux_FNC and TV_Fnc pins with the same register bits. In some
applications (such as BskyB), independent control of these output voltages is required. An external circuit pictured
below that will allow independent control. The internal register bits should be used to control the Aux_Fnc pin as this
pin is typically bi-directional. The control for the TV_Fnc pin is then controlled by the external circuit. The DO_0 and
DO_1 pins are used to switch two external transistors to create the three different voltage levels. The 150Ω resistor is
used to limit the current through Q2. With a SCART load of 10kΩ, the voltage at the TV_Fnc pin is as follows:
DO_0 = 0, DO_1 = 0; TV_Fnc = 10.9V
DO_0 = 1, DO_1 = 0; TV_Fnc = 5.7V
DO_0 = 0, DO_1 = 1; TV_Fnc = 0.0V
DO_0
DO_1
12V
1kΩ
1kΩ
Q1
150Ω
TV_Fnc
Q2
Note: DO_0 and DO_1 are not available on the 48 QFN package.
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© 2008 TERIDIAN Semiconductor Corporation
Rev 2.1