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TDA9845T Scheda tecnica(PDF) 7 Page - NXP Semiconductors |
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TDA9845T Scheda tecnica(HTML) 7 Page - NXP Semiconductors |
7 / 20 page 1995 Mar 20 7 Philips Semiconductors Preliminary specification TV and VTR stereo/dual sound processor with digital identification TDA9845 Power supply The different supply voltages and currents required for the analog and digital circuits are derived from an internal band-gap reference circuit. The AF reference voltage is 1 ⁄2VP. For a fast setting to 1⁄2VP an internal start-up circuit is added. A good ripple rejection is achieved with the external capacitor Cref = 100 µF/16 V in conjunction with the high ohmic input of the 1 ⁄2VP pin (pin 7). No additional DC load on this pin is allowed. Power-on reset When a power-on reset is activated by switching on the supply voltage or because of a supply voltage breakdown, the 117/274 Hz DPLL, the 117/274 Hz integrator and the logic will be reset. The AF channel (Main) is muted ( ≤1 ms). ESD protection All pins are ESD protected. The protection circuits represent the latest state of the art. Internal circuit The internal pin loading diagram is given in Fig.7. LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). Note 1. Charge device model class A: discharging a 200 pF capacitor through a Ω series resistor. THERMAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT VP supply voltage (pin 18) −0.3 10 V Vi voltage at pins 1, 2 and 20 −0.3 9.0 V Vi voltage at pins 3 to 13, 17 and 19 −0.3 VP V Vi voltage at pins 14 and 15 −0.3 10 V Tstg storage temperature −25 +150 °C Tamb operating ambient temperature 0 +70 °C Vesd electrostatic handling for all pins note 1 −500 +500 V SYMBOL PARAMETER VALUE UNIT Rth j-a thermal resistance from junction to ambient in free air DIP20 73 K/W SO20 90 K/W |
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