PDF TDA9885 Data sheet ( Hoja de datos )

Número de pieza	TDA9885
Descripción	I2C-bus controlled single and multistandard alignment-free IF-PLL demodulators
Fabricantes	NXP Semiconductors
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No Preview Available ! TDA9885; TDA9886 I2C-bus controlled single and multistandard alignment-free IF-PLL demodulators Rev. 03 — 16 December 2008 Product data sheet 1. General description The TDA9885 is an alignment-free multistandard (PAL and NTSC) vision and sound IF signal Phase-Locked Loop (PLL) demodulator for negative modulation only and FM processing. The TDA9886 is an alignment-free multistandard (PAL, SECAM and NTSC) vision and sound IF signal PLL demodulator for positive and negative modulation, including sound AM and FM processing. 2. Features I 5 V supply voltage I Gain controlled wideband Vision Intermediate Frequency (VIF) ampliﬁer, AC-coupled I Multistandard true synchronous demodulation with active carrier regeneration: very linear demodulation, good intermodulation ﬁgures, reduced harmonics, and excellent pulse response I Gated phase detector for L and L-accent standard I Fully integrated VIF Voltage-Controlled Oscillator (VCO), alignment-free, frequencies switchable for all negative and positive modulated standards via I2C-bus I Digital acquisition help, VIF frequencies of 33.4 MHz, 33.9 MHz, 38.0 MHz, 38.9 MHz, 45.75 MHz and 58.75 MHz I 4 MHz reference frequency input: signal from PLL tuning system or operating as crystal oscillator I VIF Automatic Gain Control (AGC) detector for gain control, operating as peak sync detector for negative modulated signals and as a peak white detector for positive modulated signals I Precise fully digital Automatic Frequency Control (AFC) detector with 4-bit digital-to-analog converter, AFC bits readable via I2C-bus I TakeOver Point (TOP) adjustable via I2C-bus or alternatively with potentiometer I Fully integrated sound carrier trap for 4.5 MHz, 5.5 MHz, 6.0 MHz and 6.5 MHz, controlled by FM-PLL oscillator I Sound IF (SIF) input for single reference Quasi Split Sound (QSS) mode, PLL controlled I SIF AGC for gain controlled SIF ampliﬁer, single reference QSS mixer able to operate in high performance single reference QSS mode and in intercarrier mode, switchable via I2C-bus I AM demodulator without extra reference circuit I Alignment-free selective FM-PLL demodulator with high linearity and low noise 1 page xxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx x xxxxxxxxxxxxxx xxxxxxxxxx xxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxx xx xxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxx xxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx xxxxxxxxxxxxxx xxxxxx xx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxx xxxxx x x CVAGC(pos) TOP TAGC 9 (8) 14 (15) VAGC(1) 16 (17) CAGC(neg) TUNER AGC VIF AGC CBL VIF-PLL filter VPLL 19 (21) RC VCO external reference signal or 4 MHz crystal REF 15 (16) AFC 21 (23) DIGITAL VCO CONTROL AFC DETECTOR VIF2 2 (31) VIF1 1 (30) SIF2 24 (27) SIF1 23 (26) SUPPLY VIF PLL TDA9885 TDA9886 SINGLE REFERENCE QSS MIXER INTERCARRIER MIXER AND AM DEMODULATOR MAD SIF AGC OUTPUT PORTS CAGC I2C-BUS TRANSCEIVER SOUND CARRIER TRAPS 4.5 MHz to 6.5 MHz (18) 17 CVBS video output: 2 V (p-p) [1.1 V (p-p) without trap] AUDIO PROCESSING AND SWITCHES (7) 8 AUD audio output (3) 5 DEEM de-emphasis network (4) 6 AFD NARROWBAND FM-PLL DEMODULATOR CAF 20 (22) VP 18 (20) AGND (6, 12, 13, 14, 17, 19, 25, 28, 29, 32) 13 n.c. 3 (1) 22 (24) 11 (10) 10 (9) 7 (5) 12 (11) OP1 OP2 SCL SDA DGND SIOMAD 4 (2) FMPLL 008aaa174 sound intercarrier output and MAD select FM-PLL filter Pin numbers for TDA9885HN and TDA9886HN in parentheses. (1) Not connected for TDA9885 Fig 1. Block diagram of TDA9885; TDA9886 5 Page NXP Semiconductors TDA9885; TDA9886 I2C-bus controlled multistandard alignment-free IF-PLL demodulators 8.8 Sound carrier trap The sound trap is constructed of three separate traps to realize sufﬁcient suppression of the ﬁrst and second sound carriers. For frequency control of the sound trap additionally a reference low-pass ﬁlter and a phase detector are built in. A sound carrier reference signal is fed into the reference low-pass ﬁlter and is shifted by nominal 90 degrees. The phase detector compares the original reference signal with the signal shifted by the reference ﬁlter and produces a DC voltage by charging or discharging an integrated capacitor with a current proportional to the phase difference between both signals, respectively to the frequency error of the integrated ﬁlters. The DC voltage controls the frequency position of the reference ﬁlter and the sound trap. So the accurate frequency position for the different standards is set by the sound carrier reference signal. 8.9 SIF ampliﬁer The SIF ampliﬁer consists of three AC-coupled differential stages. Gain control is performed by emitter degeneration and collector resistor variation. The total gain control range is typically 66 dB. The differential input impedance is typically 2 kΩ in parallel with 3 pF. 8.10 SIF-AGC detector SIF gain control is performed by detection and controlling to a reference value of the DC component of the AM demodulator output signal. This DC signal corresponds directly to the SIF voltage at the output of the SIF ampliﬁer so that a constant SIF signal is supplied to the AM demodulator and to the single reference QSS mixer. By switching the gain of the input ampliﬁer of the SIF-AGC detector via the I2C-bus, the internal SIF level for FM sound is 5.5 dB lower than for AM sound. This is to adapt the SIF-AGC characteristic to the VIF-AGC characteristic. The adaption is ideal for a picture-to-sound FM carrier ratio of 13 dB. Via a comparator, the integrated AGC capacitor is charged or discharged for providing the required SIF gain. Due to AM sound, the AGC reaction time is slow (fc < 20 Hz for the closed AGC loop). For reducing this AM sound time constant in the event of a decreasing IF amplitude step, the charge/discharge current of the AGC capacitor is increased (fast mode) when the VIF-AGC detector (at positive modulation mode) operates in the fast mode too. An additional circuit (threshold approximately 7 dB) ensures a very fast gain reduction for a large increasing IF amplitude step. 8.11 Single reference QSS mixer With the present system a high performance Hi-Fi stereo sound processing can be achieved. For a simpliﬁed application without a SIF SAW ﬁlter, the single reference QSS mixer can be switched to the intercarrier mode via the I2C-bus. The single reference QSS mixer generates the 2nd FM TV sound intercarrier signal. It is realized by a linear multiplier which multiplies the SIF ampliﬁer output signal and the VIF-PLL VCO signal (90 degrees output) which is locked to the picture carrier. In this way the QSS mixer operates as a quadrature mixer in the intercarrier mode and provides suppression of the low frequency video signals. TDA9885_TDA9886_3 Product data sheet Rev. 03 — 16 December 2008 © NXP B.V. 2008. All rights reserved. 11 of 56 11 Page

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