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TDA9884HN Folha de dados(PDF) 8 Page - NXP Semiconductors |
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8 / 58 page TDA9884_2 © Koninklijke Philips Electronics N.V. 2006. All rights reserved. Product data sheet Rev. 02 — 12 May 2006 8 of 58 Philips Semiconductors TDA9884 I2C-bus controlled multistandard alignment-free IF-PLL • FPLL detector • VCO and divider • AFC and digital acquisition help • Video demodulator and amplifier • Sound carrier trap • SIF amplifier • SIF-AGC detector • Single reference QSS mixer • AM demodulator • FM demodulator and acquisition help • Audio amplifier and mute time constant • Internal voltage stabilizer • I2C-bus transceiver and MAD 7.1 VIF amplifier The VIF amplifier consists of three AC-coupled differential stages. Gain control is performed by emitter degeneration. The total gain control range is typically 66 dB. The differential input impedance is typically 2 k Ω in parallel with 3 pF. 7.2 Tuner AGC and VIF-AGC This block adapts the voltages, generated at the VIF-AGC and SIF-AGC detectors, to the internal signal processing at the VIF and SIF amplifiers and performs the tuner AGC control current generation. Normally it is derived from the VIF-AGC, for the true split sound mode it is derived from the SIF-AGC. The onset of the tuner AGC control current generation can be set either via the I2C-bus (see Table 16) or optionally by a potentiometer at pin TOP (in case that the I2C-bus information cannot be stored). The presence of a potentiometer is automatically detected and the I2C-bus setting is disabled. Furthermore, derived from the AGC detector voltage, a comparator is used to test if the corresponding VIF input voltage is higher than 200 µV. This information can be read out via the I2C-bus (bit VIFLEV = 1). 7.3 VIF-AGC detector Gain control is performed by sync level detection (negative modulation) or peak white detection (positive modulation). For negative modulation, the sync level voltage is compared with a reference voltage (nominal sync level) by a comparator which charges or discharges the integrated AGC capacitor directly for the generation of the required VIF gain. With mobile mode the currents are increased by a factor of approximately 8 for very fast reaction. By use of an AGC event detector, the gain increase time constant (discharge current) additionally reduces in with a too-low VIF signal. For positive modulation, the white peak level voltage is compared with a reference voltage (nominal white level) by a comparator which charges (fast) or discharges (slow) the external AGC capacitor directly for the generation of the required VIF gain. The need of a |
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