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| Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification FEATURES * Picture content dependent non-linear Y and U, V processing by histogram analysis * Adaptive and variable gamma correction controls * Black and white stretch capabilities * Transparent I2C-bus control * On-chip window generator for valid histogram measurement and black detection. GENERAL DESCRIPTION The TDA9170 is a transparent analog video processor with a YUV interface. It offers three main luminance processing functions any combination of which can be selected. The luminance transfer is controlled in a non-linear manner by the distribution (in 5 discrete histogram sections) of the luminance values measured in a picture. As a result, the contrast ratio of the most important parts of the picture will be improved. ORDERING INFORMATION PACKAGE TYPE NUMBER NAME TDA9170 SDIP32 DESCRIPTION plastic shrink in-line package; 32 leads (400 mil) TDA9170 Black restoration is available in the event of a set-up in the luminance signal. A variable gamma function, after the histogram conversion, offers the possibility of excellent brightness control. To maintain a proper colour reproduction, the saturation of the U and V colour difference signals are controlled as a function of the actual non-linearity in the luminance channel. The TDA9170 concept has maximum flexibility with the optional on-board I2C-bus (including hardwired address select) and window control. The supply voltage is 8 V. The device is mounted in a 32 pin SDIP envelope. VERSION SOT232-1 October 1994 2 Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification BLOCK DIAGRAM TDA9170 October 1994 3 Fig.1 Block diagram. Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification PINNING SYMBOL DWS VARGAM AMPNLA ADGAM UIN Vref VIN AGND VDDA SC BOF YIN AMPSEL TAUBP TAUBL HM1 HM2 HM3 HM4 HM5 YOUT TAUHM n.c. VDDD DGND VOUT DT UOUT TM SDA SCL ADR PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 DESCRIPTION default window select input variable gamma input amplitude non-linearity input adaptive gamma input colour difference U input reference supply voltage output (+4 V) colour difference V input analog ground analog supply voltage sandcastle input black offset on/off input luminance input amplitude select input time constant black peak time constant black loop histogram segment memory 1 histogram segment memory 2 histogram segment memory 3 histogram segment memory 4 histogram segment memory 5 luminance output time constant histogram measurement loop not connected digital supply voltage (+5 V) digital ground colour difference V output test option colour difference U output test option serial data input/output (I2C-bus) serial clock input (I2C-bus) address select input (I2C-bus) Fig.2 Pin configuration. TDA9170 October 1994 4 Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification FUNCTIONAL DESCRIPTION Y input selection and amplification The dynamic range of the luminance input amplifier can be switched between 0.3 and 1 V (excluding sync) either externally (pin AMPSEL) or by I2C-bus (AMPSEL bit). Amplitudes that exceed the corresponding specified range (e.g. the sync) will be clipped internally. The input is clamped during the logic HIGH period of the clamp which is defined by the sandcastle reference and should be DC-decoupled with an external capacitor. Black offset detection and correction The black detector measures and stores the blackest part of the picture within a defined window in each field. Any difference between this value and the value measured during the black clamp period is regarded as black offset. In a closed loop configuration, the black offset is held until a predefined value of the full scale (FS) value is fed back to the input stage where it is partly compensated for. Depending on the loop gain, 30% to 50% of the offset value is counteracted. The loop gain is also a function of the adaptive and variable gamma settings. The black offset correction mechanism can be switched on and off by the I2C-bus via the BON bit (see Table 6), or externally with the black offset on/off switch (BOF pin 11). Two external time constants are required to ensure correct performance of the black detector; a loop filter time constant (TAUBL) for the loop dynamics and a time constant for memorizing the darkest parts of the picture (TAUBP) in just one field. During the field retrace the time constant TAUBP is first sampled and then preset to a value that corresponds to the maximum black offset. The corrected black offset is related to the nominal signal amplitude which is reset to 100% FS via an amplitude stretch function. Luminance values beyond FS are not affected. Additionally, this offset is also used to set the adaptive gain (see Section "Adaptive gamma"). Histogram measurement The histogram distribution is measured in real time over five segments (HM1 to HM5) within a defined window period of each field. During the window period, the video is in one segment, a corresponding external capacitor CHMx is loaded via a current source. At the end of the field five segment voltages are stored from the external capacitors into on-board memories. The external capacitors are discharged and the measurements are restarted. TDA9170 Any part of the picture that does not contribute to the information within the total picture should be omitted from the histogram measurement. The miscount detector disables measurements until it detects changing parts. Additionally, luminance values close to FS (or white) do not contribute sufficiently in order to maintain the absolute light output. This procedure is allowed because the eye is less sensitive to details in white. As the miscount detector shortens the effective measurement period and, because of spreads of internal and external components, the current source is controlled within in a closed loop so as to maintain a constant average value of the sum of the segment voltages. The dominant time constant of the closed loop is external and can be tuned with an appropriate capacitor connected to TAUHM (pin 22). Processing of the measured histogram values FIELD AVERAGING OF HISTOGRAM VALUES With very rapid picture changes, also related to the field interlace, flicker might result. The histogram values are averaged at the field rate to reduce these flicker effects. The time constant of the averaging process is adapted to the speed of the histogram changes. ADAPTIVE GAMMA The output voltage of the first segment is fed to a variable gain amplifier with a gain between 1 and 3. In this way luminance values in the `black' segment have a larger weight. In our perception black parts are expanded, as occurs with gamma control. However, the effective contribution to the non-linear gain is only relevant for moderate segment voltages and hence the term adaptive gamma. The adaptive gamma gain is a max-function of a fixed gain part and a dynamic gain part. The fixed gain part can be set externally with the adaptive gamma gain control (ADGAM) or via the I2C-bus. The dynamic part of the adaptive gamma gain is controlled by the measured black offset value from the black detector. October 1994 5 Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification ADAPTIVE WHITE-POINT STRETCHING For dominant HM4 and HM5 voltages or large white parts the histogram conversion procedure makes a transfer with large gain in the white parts. However, the amount of light being emitted from the picture is considerably reduced. The white stretcher introduces additional overall gain for increased light production and, as a result, violates the principle of having a full-scale reference. STANDARD DEVIATION For pictures in which segments of the histogram distribution are very dominant, with respect to the others, the non-linear amplification should be reduced to compensate for pictures with a flat histogram distribution. The standard deviation detector measures the spread of the histogram distribution in the segments HM1 to HM5 and modulates the user setting of the non-linear amplifier. Non-linear amplifier The stored segment voltages, relative to their average value and averaged over two fields, determine the individual gain of each segment in such a way that continuity is guaranteed for the complete range. The maximum and minimum gain of each segment is limited. Apart from the adaptive white-point stretching the black and white references are not affected by the non-linear processing. The amount of linearity can be controlled externally at AMPNLA (pin 3) or via the I2C-bus. Variable gamma function As well as the histogram conversion, a variable gamma function can be applied to ensure excellent brightness control. It is intended as an alternative to the DC-offset of the classic brightness user control; it maintains the black and white references. The gamma ranges from 0.5 to 1.5. The gamma can be set externally at VARGAM (pin 2) or via the I2C-bus. Colour compensation Non-linear luminance processing influences the colour reproduction, mainly the colour saturation. Therefore, U and V signals are also processed for saturation compensation. The U and V input signals are clamped during the logic HIGH period of the clamp which is defined by the sandcastle reference and should be DC decoupled with external capacitors. Timing generator TDA9170 The TDA9170 is equipped with a transparent internal timing generator for window purposes. As a timing reference the relevant sandcastle (SC) can be used. The window enables the black measurement and the histogram measurement circuitry. The internal timing generator is basically intended for system invariant operation. The default window handles all existing norms and disables measurement in subtitles or logos. This default window is preset at power-up and can be selected with a logic HIGH level at the default window select DWS (pin 1). If not selected the blanking of the sandcastle will define the window borders. However, using the I2C-bus and setting the WD1 and WD2 control bits (see Table 3), the window format can also be user-programmed. The horizontal window generator synchronizes on the rising edge of the burst key/clamp key of the external sandcastle reference with an adjustable window start and stop delay. The vertical window generator synchronizes on the falling edge of the first burst key/clamp key after a field pulse recognition. I2C-bus specification The I2C-bus is designed for transparent use. At power-up all registers are preset for system invariant and external control. All pins related to the I2C-bus can be left open-circuit when the I2C-bus is in the standby mode. If the sleep mode bit in the control register is set all settings are left to bus control. For the relevant registers and addresses see Tables 2 to 8. October 1994 6 Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification Table 1 A6 1 Table 2 Slave address. A5 1 Control function. TYPE REG DAC DAC DAC REG REG REG SUB-ADDRESS(1) D7 00 01 02 03 04 05 - X X X X ST3 ST3 X D6 X X X X ST2 ST2 X D5 X D5 D5 D5 ST1 ST1 X DATA BYTE D4 BON D4 D4 D4 ST0 ST0 X D3 WD2 D3 D3 D3 SP3 SP3 X D2 WD1 D2 D2 D2 SP2 SP2 X A4 0 A3 1 A2 0 A1 0 A0 ADR TDA9170 R/W X CONTROL FUNCTION Control User variable gamma Adaptive gamma Non-linear amplifier Line start stop Field start stop Status Note D1 AMS D1 D1 D1 SP1 SP1 X D0 SLP D0 D0 D0 SP0 SP0 POR 1. Valid sub-addresses: 00 to 05 (HEX); auto-increment mode available for sub-addresses. Table 3 WD1 0 0 1 Table 4 Window select bits (WD1 and WD2). WD2 0 1 X FUNCTION default window window by sandcastle blanking user window Table 6 Amplitude select bit (AMS). FUNCTION 0.3 V luminance 1 V luminance Black offset compensation enable bit (BON). FUNCTION disabled enabled LOGIC LEVEL 0 1 Table 5 Sleep mode bit (SLP). FUNCTION sleep I2C-bus control LOGIC LEVEL 0 1 LOGIC LEVEL 0 1 October 1994 7 Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification Window formats Table 7 Line frequency start stop format. TIMING(2) 4.5 1 64fh + 64fh x DEC(ST3, ST2, ST1, ST0) TDA9170 LINE WINDOW(1) Start (LWS) Stop (LWP) Default Notes 26.5 64fh UNIT s s + 264fh x DEC(SP3, SP2, SP1, SP0) DEC(ST3, ST2, ST1, ST0) = 2 DEC(SP3, SP2, SP1, SP0) = 14 1. Start and stop events are relative to the leading edge of the BK/CLP pulse of the sandcastle. 2. fh is defined as the line frequency. Table 8 Field frequency start stop format. TIMING 10 + 6 x DEC(ST3, ST2, ST1, ST0) 121 + 10 x DEC(SP3, SP2, SP1, SP0) DEC(ST3, ST2, ST1, ST0) = 9 DEC(SP3, SP2, SP1, SP0) = 4 lines lines UNIT FIELD WINDOW(1) Start (FWS) Stop (FWP) Default Note 1. The start event is relative to the trailing edge of the first BK/CLP pulse after a field pulse recognition. The stop event is relative to the actual start event. October 1994 8 Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL VDDA VDDD Vref Vn Tstg Tamb Ves PARAMETER analog supply voltage digital supply voltage reference supply voltage voltage input/output on any other pin storage temperature operating ambient temperature electrostatic discharge note 1 note 2 Notes 1. Human body model: equivalent to discharging a 100 pF capacitor through a 1.5 k resistor. 2. Machine model: equivalent to discharging a 200 pF capacitor through a 0 resistor. QUALITY SPECIFICATION CONDITIONS MIN. -0.5 -0.5 -0.5 -0.5 -55 -10 -2000 -200 TDA9170 MAX. +8.8 +5.5 +5.5 +150 +70 +2000 +200 V V V C C V V UNIT VDDA + 0.5 V In accordance with "SNW-FQ-611 part E". The numbers of the quality specification can be found in the "Quality Reference Handbook". The Handbook can be ordered using the code 9398 510 63011. All pins are protected against electrostatic discharge by means of clamping diodes. Latch-up At Tamb = 70 C all pins meet the specification as follows, except for pins 6 and 7 at positive trigger currents: Itrigger > 100 mA or Vpin > 1.5VDDA(max). Itrigger < -100 mA or Vpin < -0.5VDDA(max). pin 6, Vref: Itrigger > 40 mA or Vpin > 1.5VDDA(max). pin 24, VDDD: Itrigger > 70 mA or Vpin > 1.5VDDA(max). THERMAL CHARACTERISTICS SYMBOL Rth j-a PARAMETER thermal resistance from junction to ambient in free air VALUE 48 UNIT K/W October 1994 9 Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification CHARACTERISTICS VDDA = 8 V; Tamb = 25 C; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. - 5.0 4.0 40 - - TYP. TDA9170 MAX. UNIT Supply (pins 6, 9 and 24) VDDA VDDD Vref IDDA Zo(24) Zo(6) analog supply voltage digital supply voltage reference supply voltage analog supply current output impedance output impedance 7.2 - - - - - 8.8 - - - 250 250 V V V mA Luminance input/output selection LUMINANCE INPUT (PIN 12); note 1 Vi(Y) Vi(Yclamp) Iib(Y) Vi(SEL)l Vi(SEL)h Iib(SEL) Vo(Y) VoYclamp Vno BY BY(nl) Ebl EG(n) luminance input voltage input voltage level during clamping input bias current AMPSEL = 0 AMPSEL = 1 0.3 1.0 - - - 3.5 - AMPSEL = 0 AMPSEL = 1 output voltage level during clamping output noise voltage luminance bandwidth non-linear processing luminance bandwidth black level error nominal gain error no offset; transparent no offset; transparent transparent AMPSEL = 0 AMPSEL = 1 0.3 1.0 - - 52 7 10 - - - - 1.5 - - - - - - 2.9 2.0 - 9 - - - - - - 0.1 V V V A V V A V V V V dB MHz MHz % % LUMINANCE INPUT VOLTAGE RANGE SELECTION AMPSEL (PIN 13); note 2 input voltage selection for lower range input voltage selection for higher range input bias current 1.5 - 0.1 - - - - - - - 1 8 LUMINANCE OUTPUT (PIN 21) luminance output voltage Black detection and correction BLACK DETECTOR Blosd(max) Blosc(max) maximum black offset detection at the input maximum black offset correction at the input 23 8 25 10 27 12 % % October 1994 10 Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification SYMBOL PARAMETER CONDITIONS - - 3.5 - - - - - - - - MIN. - - - - - - 1.0 2.5 - 2.0 3.5 TYP. TDA9170 MAX. UNIT PICTURE AMPLITUDE STRETCH EG(s) Vi(blos) Iib(blos) IBP(d) IibBP VBP(l) VBP(h) IibBL VBL(l) VBL(h) gain error after stretch maximum offset 1 % BLACK OFFSET CORRECTION ON/OFF SWITCH BOF (PIN 11); note 2 input voltage level input bias current correction off correction on TIME CONSTANT CONTROL TAUBP (PIN 4); see Fig.3 discharge current input bias current control voltage lower limit control voltage upper limit 3.5 0.1 - - 0.1 - - mA A V V A V V 1.5 - 0.1 V V A TIME CONSTANT CONTROL TAUBL (PIN 5); see Fig.4 input bias current control voltage lower limit control voltage upper limit Histogram measurement HISTOGRAM UPDATES AT HMX (PINS 16 TO 20) QHMb VHM(av) VHM(min) VHM(max) IibHM IibTHM VTHM(l) VTHM(h) Qmc(d) tp(mc) to(mc) tY(mc) Qmc(aW) Qmc(dW) segment bleeder accuracy average voltage level for 5 segments minimum segment voltage level maximum segment voltage level input bias current - - 0 - - - - - - 20% step - 0.31 - no miscount miscount - - - 1.0 - 5.0 - - 1.0 2.0 2 - - - 0.1 % V V V A A V V TIME CONSTANT CONTROL TAUHM (PIN 22); see Figs 5, 6 and 7 input bias current control voltage lower limit control voltage upper limit 0.1 - - - - 0.41 20 - - MISCOUNT DETECTION miscount detection level miscount propagation delay miscount detection on-time for each event mismatch propagation and luminance delay miscount activation level at white miscount de-activation level at white 5 25 0.36 - 90 87 % ns s ns % % October 1994 11 Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification SYMBOL PARAMETER CONDITIONS MIN. TYP. TDA9170 MAX. UNIT Processing of measured histogram values ADAPTIVE GAMMA CONTROL RANGE Gadg(min) Gadg(max) Vadg(l) Vadg(h) IibADG Gadp(min) Gadp(max) Gadb(min) Gadb(max) minimum gain for HM1 maximum gain for HM1 - - - - - no offset; GVAR = 1 no offset; GVAR = 1 no offset; GVAR = 1 maximum offset; GVAR = 1 HM-pattern = 01103: Gnl = 1 - - - - 1 3 - - - - 0.1 - - - - V V A ADAPTIVE GAMMA SETTING ADGAM (PIN 4); note 3; see Fig.8 control voltage lower limit control voltage upper limit input bias current minimum gain for HM1 maximum gain for HM1 1.75 3.25 - 1 3 ADAPTIVE GAMMA BY BLACK OFFSET minimum gain for HM1 maximum gain for HM1 1 2.5 WHITE-POINT STRETCH Gwp maximum gain luminance for white stretch - 1.09 - Non-linear amplifier NON-LINEAR GAIN SET BY HMX (PINS 16 TO 20) Qnl(b) Gnl(min) Gnl(max) segment bleeder accuracy minimum gain segment maximum gain segment HM-pattern = 31100: Gnl = 1 HM-pattern = 31100: Gnl = 1 - - - - 0.36 2.28 2 - - % NON-LINEARITY SETTING AMPNLA (PIN 3); note 3 Vnl(l) Vnl(h) Iib(nl) DYNAMICS td(nl) delay between linear and non-linear path - - 20 ns control voltage lower limit control voltage upper limit input bias current - - - 1.75 3.25 - - - 0.1 V V A Variable gamma VARIABLE GAMMA CONTROL RANGE GVAR(min) GVAR(max) minimum variable gamma setting maximum variable gamma setting - - 0.5 1.5 - - October 1994 12 Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification SYMBOL PARAMETER CONDITIONS - - - - MIN. TYP. - - - TDA9170 MAX. UNIT VARIABLE GAMMA SETTING VARGAM (PIN 2); note 3 VVAR(l) VVAR(h) VVAR(lt) IibVAR control voltage lower limit control voltage upper limit control voltage for linear transfer input bias current 1.75 3.25 2.5 - V V V A 0.1 Colour difference processing COLOUR DIFFERENCE INPUTS UIN AND VIN (PINS 5 AND 7) Vi(UIN) Vi(VIN) Iib Vi(cl) input voltage input voltage input bias current (pins 5 and 7) input voltage level during clamping 1.8 1.8 - - - - - 1.5 - - 0.1 - V V A V COLOUR DIFFERENCE OUTPUTS (PINS 28 AND 26) Vo28 Vo26 Vo(cl) Eoff EG B Timing HORIZONTAL WINDOW GENERATION fh line frequency 15 - - - 6.5 64fh 54.5 64fh output voltage range with respect to the input (pin 28) output voltage range with respect to the input (pin 26) output voltage level during clamping offset error gain error bandwidth transparent transparent transparent 150 150 - - - 20 - - 2.3 - - 30 - - - 1 5 - % % V % % MHz 16 - - - - - - 65 - - kHz Default window setting (with respect to start BK/CLP pulse) tdh(ws) tdhd(wp) thws(min) thws(max) thwp(min) thwp(max) fv default start window default window stop User window generation with I2C-bus (with respect to start BK/CLP pulse) - - - - 45 - - 4.5 64fh 19.5 64fh 26.5 64fh 56.5 64fh minimum start window maximum start window minimum window stop maximum window stop VERTICAL WINDOW GENERATION vertical frequency - 64 161 Hz Default window setting (start event with respect to start detected field blanking, stop event with respect to start event) tdvws tdvdwp default window start default window stop lines lines October 1994 13 Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification SYMBOL PARAMETER CONDITIONS - - - - - 3.5 VDWS = VDDA no blanking; no clamp with blanking; no clamp ti(sw) input sync width no vertical sync with vertical sync CLP PULSE WIDTH RESTORATION td(clp) internal CLP pulse width difference - -100 - - - 1.2 - 35 MIN. TYP. - - - - TDA9170 MAX. UNIT User window generation with tvsw(min) tvsw(max) tvwp(min) tvwp(max) Visc(DWS) Vid(DWS) IibDWS Vi(SC) I2C-bus 10 100 121 271 - - - lines lines lines lines minimum window start maximum window start minimum window stop maximum window stop Default window select DWS; (pin 1): note 2 voltage input level for window by SC blanking voltage input level for default window input bias current 1.5 5.5 10 V V A Sandcastle input SC; (pin 10) voltage input level 0 1.5 3.5 - - 1.0 1.8 3.9 15 - V V V s s ns with blanking and clamp 3.1 I2C-bus specification ADDRESS SELECT ADR (PIN 32) ViADR IibADR Vi(test) td(YUV) tdm(YUV) w(YUV) Notes 1. Input amplitude values greater than the minimum specified range are still processed. However, the gain will slowly saturate. Amplitudes up to +4 dB are permitted without significant clipping. 2. This select is valid provided the sleep mode bit is not set. 3. This control is valid provided the sleep mode bit is not set. input voltage level input bias current A0 = 0 A1 = 1 TEST PINS TM AND DT (PINS 29 AND 27) input voltage level - - - - - 0.5 V - 3.5 - - - - 1.5 5.5 0.1 V V A Overall output performance delay from input to output of YUV delay of matching YUV crosstalk from window transparent transparent any channel 50 10 - 100 20 -60 ns ns dB October 1994 14 BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB Fig.3 Black occurrence detection time constant as a function of CTAUBP. Preliminary specification October 1994 Philips Semiconductors The dashed line = 625 lines/frame. The full line = 525 lines/frame. YUV picture improvement processor based on histogram modification Fig.4 Response time constant black level loop as a function of CTAUBL. 15 TDA9170 Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification TDA9170 (1) Minimum user window. (2) Default window. (3) Maximum user window, window by sandcastle blanking. Rmc = 1. Weff = thw x Nvw x Rmc. Where: thw = horizontal window width (s). Nvw = vertical window height (lines). Rmc = effective histogram measuring time within window due to miscount in percentage of thw x Nvw. Fig.5 Response speed of average histogram amplitude control loop as a function of CTAUHM at 60 Hz field-rate. October 1994 BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB 16 Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification TDA9170 (1) Minimum user window. (2) Default window. (3) Maximum user window. (4) window by sandcastle blanking. Rmc = 1. Weff = thw x Nvw x Rmc. Where: thw = horizontal window width (s). Nvw = vertical window height (lines). Rmc = effective histogram measuring time within window due to miscount in percentage of thw x Nvw. Fig.6 Response speed of average histogram amplitude control loop as a function of CTAUHM at 50 Hz field-rate. October 1994 BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB 17 Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification TDA9170 Weff = thw x Nvw x Rmc. Where: thw = horizontal window width (s). Nvw = vertical window height (lines). Rmc = effective histogram measuring time within window due to miscount in percentage of thw x Nvw. Fig.7 Static error on average histogram amplitude (pin TAUHM) as a function of effective histogram measuring time in a field. October 1994 18 BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB Philips Semiconductors October 1994 YUV picture improvement processor based on histogram modification Fig.9 Non-linear amplifier non-linearity setting as a function of AMPNLA setting in sleep mode. Fig.8 Adaptive gamma gain setting as a function of ADGAM setting in sleep mode. 19 Preliminary specification TDA9170 BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBB Philips Semiconductors October 1994 YUV picture improvement processor based on histogram modification Fig.10 Variable gamma setting as a function of VARGAM setting in sleep mode. 20 Preliminary specification TDA9170 Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification APPLICATION INFORMATION (BUS-MODE) TDA9170 Fig.11 Application diagram. October 1994 21 seating plane October 1994 29.4 28.5 10.7 10.2 3.8 max 4.7 max 0.51 min 0.18 M 0.32 max 10.16 12.2 10.5 MSA270 PACKAGE OUTLINE Philips Semiconductors 3.2 2.8 1.6 max 1.778 (15x) 1.3 max 0.53 max YUV picture improvement processor based on histogram modification 22 17 9.1 8.7 16 32 1 Dimensions in mm. Preliminary specification TDA9170 Fig.12 Plastic shrink dual in-line package; 32 leads (400 mil) SDIP32; SOT232-1. Philips Semiconductors Preliminary specification YUV picture improvement processor based on histogram modification SOLDERING Plastic dual in-line packages BY DIP OR WAVE The maximum permissible temperature of the solder is 260 C; this temperature must not be in contact with the joint for more than 5 s. The total contact time of successive solder waves must not exceed 5 s. The device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified storage maximum. DEFINITIONS Data sheet status Objective specification Preliminary specification Product specification Limiting values REPAIRING SOLDERED JOINTS TDA9170 If the printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit. Apply a low voltage soldering iron below the seating plane (or not more than 2 mm above it). If its temperature is below 300 C, it must not be in contact for more than 10 s; if between 300 and 400 C, for not more than 5 s. This data sheet contains target or goal specifications for product development. This data sheet contains preliminary data; supplementary data may be published later. This data sheet contains final product specifications. Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. PURCHASE OF PHILIPS I2C COMPONENTS Purchase of Philips I2C components conveys a license under the Philips' I2C patent to use the components in the I2C system provided the system conforms to the I2C specification defined by Philips. This specification can be ordered using the code 9398 393 40011. October 1994 23 |
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