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TEA5711T Folha de dados(PDF) 6 Page - NXP Semiconductors |
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TEA5711T Folha de dados(HTML) 6 Page - NXP Semiconductors |
6 / 28 page September 1994 6 Philips Semiconductors Product specification AM/FM stereo radio circuit TEA5711; TEA5711T FUNCTIONAL DESCRIPTION The AM circuit incorporates a double balanced mixer, a one pin low-voltage oscillator (up to 30 MHz) a field-strength indicator output and is designed for distributed selectivity. The AM input is designed to be connected to the top of a tuned circuit. AGC controls the IF amplification and for large signals it lowers the input impedance. The first AM selectivity can be an IFT as well as an IFT combined with a ceramic filter; the second one is an IFT. The FM circuit incorporates a tuned RF stage, a double balanced mixer, a one-pin oscillator, a field-strength indicator output and is designed for distributed IF ceramic filters. The FM quadrature detector uses a ceramic resonator. The PLL stereo decoder incorporates a signal dependent stereo circuit, a soft-mute circuit and a stereo indicator LED driver. Supply voltage behaviour The TEA5711 incorporates internal stabilized power supplies. The maximum supply voltage is 12 V, the minimum voltage can go down temporarily to 1.8 V without any loss in performance. Due to the capacitor at pin 19 (RIPPLE) the IC gives excellent performance, even when the actual supply voltage at pin 25 (VP) drops below the voltage at pin 19 (RIPPLE). Figures 4, 5 and 6 show that Vstab, which is dominant for the overall IC performance, remains unaffected, even if VP drops down to 1.8 V or less. In this typical example the static or average VP is equal to 2.5 V. Dips in Vstab appear only when the peak-to-peak value of the AC-component of VP > 2 V, i.e. when the dynamic value of VP drops down to 1.5 V for a short moment. Fig.4 Supply voltage behaviour; VP as a function of time. Fig.5 Supply voltage behaviour; Vripple as a function of time. Fig.6 Supply voltage behaviour; Vstab as a function of time. |
Nº de peça semelhante - TEA5711T |
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Descrição semelhante - TEA5711T |
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