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TDA9815 датащи(PDF) 8 Page - NXP Semiconductors |
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TDA9815 датащи(HTML) 8 Page - NXP Semiconductors |
8 / 40 page 1998 Feb 11 8 Philips Semiconductors Product specification Multistandard/MAC VIF-PLL with QSS-IF and dual FM-PLL/AM demodulator TDA9815 The AF amplifier consists of two parts: 1. The AF preamplifier for FM sound is an operational amplifier with internal feedback, high gain and high common mode rejection. The AF voltage from the PLL demodulator, by principle a small output signal, is amplified by approximately 33 dB. The low-pass characteristic of the amplifier reduces the harmonics of the intercarrier signal at the sound output terminal. An additional DC control circuit is implemented to keep the DC level constant, independent of process spread. 2. The AF output amplifier (10 dB) provides the required output level by a rail-to-rail output stage. This amplifier makes use of an input selector for switching to AM/FM or mute state, controlled by the standard switching voltage and the mute switching voltage. Internal voltage stabilizer and 1 ⁄2VP-reference The bandgap circuit internally generates a voltage of approximately 1.25 V, independent of supply voltage and temperature. A voltage regulator circuit, connected to this voltage, produces a constant voltage of 3.6 V which is used as an internal reference voltage. For all audio output signals the constant reference voltage cannot be used because large output signals are required. Therefore these signals refer to half the supply voltage to achieve a symmetrical headroom, especially for the rail-to-rail output stage. For ripple and noise attenuation the 1 ⁄2VP voltage has to be filtered via a low-pass filter by using an external capacitor together with an integrated resistor (fg = 5 Hz). For a fast setting to 1⁄2VP an internal start-up circuit is added. LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). Notes 1. IP = 125 mA; Tamb =70 °C; Rth(j-a) = 60 K/W. 2. Machine model class B (L = 2.5 µH). THERMAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT VP supply voltage (pin 29) maximum chip temperature of 125 °C; note 1 0 7.0 V Vi voltage at pins 1 to 9, 11 to 19, 22, 23 and 26 to 32 0VP V ts(max) maximum short-circuit time − 10 s V19 tuner AGC output voltage 0 13.2 V Tstg storage temperature −25 +150 °C Tamb operating ambient temperature −20 +70 °C Ves electrostatic handling voltage note 2 −300 +300 V SYMBOL PARAMETER CONDITIONS VALUE UNIT Rth(j-a) thermal resistance from junction to ambient in free air 60 K/W |
Аналогичный номер детали - TDA9815 |
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Аналогичное описание - TDA9815 |
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