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october 1994 2 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 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 i 2 c-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. 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 i 2 c-bus (including hardwired address select) and window control. the supply voltage is 8 v. the device is mounted in a 32 pin sdip envelope. ordering information type number package name description version TDA9170 sdip32 plastic shrink in-line package; 32 leads (400 mil) sot232-1
october 1994 3 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 block diagram fig.1 block diagram.
october 1994 4 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 pinning symbol pin description dws 1 default window select input vargam 2 variable gamma input ampnla 3 amplitude non-linearity input adgam 4 adaptive gamma input uin 5 colour difference u input v ref 6 reference supply voltage output (+4 v) vin 7 colour difference v input agnd 8 analog ground v dda 9 analog supply voltage sc 10 sandcastle input bof 11 black offset on/off input yin 12 luminance input ampsel 13 amplitude select input taubp 14 time constant black peak taubl 15 time constant black loop hm1 16 histogram segment memory 1 hm2 17 histogram segment memory 2 hm3 18 histogram segment memory 3 hm4 19 histogram segment memory 4 hm5 20 histogram segment memory 5 yout 21 luminance output tauhm 22 time constant histogram measurement loop n.c. 23 not connected v ddd 24 digital supply voltage (+5 v) dgnd 25 digital ground vout 26 colour difference v output dt 27 test option uout 28 colour difference u output tm 29 test option sda 30 serial data input/output (i 2 c-bus) scl 31 serial clock input (i 2 c-bus) adr 32 address select input (i 2 c-bus) fig.2 pin configuration.
october 1994 5 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 functional description y input selection and ampli?cation 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 i 2 c-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 i 2 c-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 c hmx 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. 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 f ield 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. a daptive 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 i 2 c-bus. the dynamic part of the adaptive gamma gain is controlled by the measured black offset value from the black detector.
october 1994 6 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 a daptive 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. s tandard 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 ampli?er 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 i 2 c-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 i 2 c-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 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 i 2 c-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. i 2 c-bus speci?cation the i 2 c-bus is designed for transparent use. at power-up all registers are preset for system invariant and external control. all pins related to the i 2 c-bus can be left open-circuit when the i 2 c-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 7 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 table 1 slave address. table 2 control function. note 1. valid sub-addresses: 00 to 05 (hex); auto-increment mode available for sub-addresses. a6 a5 a4 a3 a2 a1 a0 r/w 1 1 0 1 0 0 adr x control function type sub-address (1) data byte d7 d6 d5 d4 d3 d2 d1 d0 control reg 00 x x x bon wd2 wd1 ams slp user variable gamma dac 01 x x d5 d4 d3 d2 d1 d0 adaptive gamma dac 02 x x d5 d4 d3 d2 d1 d0 non-linear ampli?er dac 03 x x d5 d4 d3 d2 d1 d0 line start stop reg 04 st3 st2 st1 st0 sp3 sp2 sp1 sp0 field start stop reg 05 st3 st2 st1 st0 sp3 sp2 sp1 sp0 status reg - x x x x x x x por table 3 window select bits (wd1 and wd2). table 4 amplitude select bit (ams). wd1 wd2 function 0 0 default window 0 1 window by sandcastle blanking 1 x user window logic level function 0 0.3 v luminance 1 1 v luminance table 5 sleep mode bit (slp). table 6 black offset compensation enable bit (bon). logic level function 0 sleep 1 i 2 c-bus control logic level function 0 disabled 1 enabled
october 1994 8 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 window formats table 7 line frequency start stop format. notes 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. 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. line window (1) timing (2) unit start (lws) 4.5 64fh + 1 64fh dec(st3, st2, st1, st0) m s stop (lwp) 26.5 64fh + 2 64fh dec(sp3, sp2, sp1, sp0) m s default dec(st3, st2, st1, st0) = 2 dec(sp3, sp2, sp1, sp0) = 14 field window (1) timing unit start (fws) 10 + 6 dec(st3, st2, st1, st0) lines stop (fwp) 121 + 10 dec(sp3, sp2, sp1, sp0) lines default dec(st3, st2, st1, st0) = 9 dec(sp3, sp2, sp1, sp0) = 4
october 1994 9 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 limiting values in accordance with the absolute maximum rating system (iec 134). notes 1. human body model: equivalent to discharging a 100 pf capacitor through a 1.5 k w resistor. 2. machine model: equivalent to discharging a 200 pf capacitor through a 0 w resistor. quality specification 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 t amb = 70 c all pins meet the specification as follows, except for pins 6 and 7 at positive trigger currents: i trigger > 100 ma or v pin > 1.5v dda(max) . i trigger < - 100 ma or v pin < - 0.5v dda(max) . pin 6, v ref : i trigger > 40 ma or v pin > 1.5v dda(max) . pin 24, v ddd : i trigger > 70 ma or v pin > 1.5v dda(max) . thermal characteristics symbol parameter conditions min. max. unit v dda analog supply voltage - 0.5 +8.8 v v ddd digital supply voltage - 0.5 +5.5 v v ref reference supply voltage - 0.5 +5.5 v v n voltage input/output on any other pin - 0.5 v dda + 0.5 v t stg storage temperature - 55 +150 c t amb operating ambient temperature - 10 +70 c v es electrostatic discharge note 1 - 2000 +2000 v note 2 - 200 +200 v symbol parameter value unit r th j-a thermal resistance from junction to ambient in free air 48 k/w
october 1994 10 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 characteristics v dda = 8 v; t amb = 25 c; unless otherwise speci?ed. symbol parameter conditions min. typ. max. unit supply (pins 6, 9 and 24) v dda analog supply voltage 7.2 - 8.8 v v ddd digital supply voltage - 5.0 - v v ref reference supply voltage - 4.0 - v i dda analog supply current - 40 - ma z o(24) output impedance - - 250 w z o(6) output impedance - - 250 w luminance input/output selection l uminance input ( pin 12); note 1 v i(y) luminance input voltage ampsel = 0 0.3 - - v ampsel = 1 1.0 - - v v i(yclamp) input voltage level during clamping - 1.5 - v i ib(y) input bias current - - 0.1 m a l uminance input voltage range selection ampsel ( pin 13); note 2 v i(sel)l input voltage selection for lower range - - 1.5 v v i(sel)h input voltage selection for higher range 3.5 - - v i ib(sel) input bias current - - 0.1 m a l uminance output ( pin 21) v o(y) luminance output voltage ampsel = 0 0.3 - - v ampsel = 1 1.0 - - v v oyclamp output voltage level during clamping ampsel = 0 - 2.9 - v ampsel = 1 - 2.0 - v v no output noise voltage 52 - - db b y luminance bandwidth transparent 7 9 - mhz b y(nl) non-linear processing luminance bandwidth 10 - - mhz e bl black level error no offset; transparent - - 1 % e g(n) nominal gain error no offset; transparent - - 8 % black detection and correction b lack detector bl osd(max) maximum black offset detection at the input 23 25 27 % bl osc(max) maximum black of fset correction at the input 8 10 12 %
october 1994 11 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 p icture amplitude stretch e g(s) gain error after stretch maximum offset - - 1 % b lack offset correction on / off switch bof ( pin 11); note 2 v i(blos) input voltage level correction off - - 1.5 v correction on 3.5 - - v i ib(blos) input bias current - - 0.1 m a t ime constant control taubp ( pin 4); see fig.3 i bp(d) discharge current - - 3.5 ma i ibbp input bias current - - 0.1 m a v bp(l) control voltage lower limit - 1.0 - v v bp(h) control voltage upper limit - 2.5 - v t ime constant control taubl ( pin 5); see fig.4 i ibbl input bias current - - 0.1 m a v bl(l) control voltage lower limit - 2.0 - v v bl(h) control voltage upper limit - 3.5 - v histogram measurement h istogram updates at hm x ( pins 16 to 20) q hmb segment bleeder accuracy - - 2 % v hm(av) average voltage level for 5 segments - 1.0 - v v hm(min) minimum segment voltage level 0 - - v v hm(max) maximum segment voltage level - 5.0 - v i ibhm input bias current - - 0.1 m a t ime constant control tauhm ( pin 22); see figs 5, 6 and 7 i ibthm input bias current - - 0.1 m a v thm(l) control voltage lower limit - 1.0 - v v thm(h) control voltage upper limit - 2.0 - v m iscount detection q mc(d) miscount detection level - 5 - % t p(mc) miscount propagation delay 20% step - 25 - ns t o(mc) miscount detection on-time for each event 0.31 0.36 0.41 m s t y(mc) mismatch propagation and luminance delay - - 20 ns q mc(aw) miscount activation level at white no miscount - 90 - % q mc(dw) miscount de-activation level at white miscount - 87 - % symbol parameter conditions min. typ. max. unit
october 1994 12 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 processing of measured histogram values a daptive gamma control range g adg(min) minimum gain for hm1 - 1 - g adg(max) maximum gain for hm1 - 3 - a daptive gamma setting adgam ( pin 4); note 3; see fig.8 v adg(l) control voltage lower limit - 1.75 - v v adg(h) control voltage upper limit - 3.25 - v i ibadg input bias current - - 0.1 m a g adp(min) minimum gain for hm1 no offset; g var = 1 - 1 - g adp(max) maximum gain for hm1 no offset; g var = 1 - 3 - a daptive gamma by black offset g adb(min) minimum gain for hm1 no offset; g var = 1 - 1 - g adb(max) maximum gain for hm1 maximum offset; g var = 1 - 2.5 - w hite - point stretch g wp maximum gain luminance for white stretch hm-pattern = 01103: g nl = 1 - 1.09 - non-linear ampli?er n on - linear gain set by hm x ( pins 16 to 20) q nl(b) segment bleeder accuracy - - 2 % g nl(min) minimum gain segment hm-pattern = 31100: g nl = 1 - 0.36 - g nl(max) maximum gain segment hm-pattern = 31100: g nl = 1 - 2.28 - n on - linearity setting ampnla ( pin 3); note 3 v nl(l) control voltage lower limit - 1.75 - v v nl(h) control voltage upper limit - 3.25 - v i ib(nl) input bias current - - 0.1 m a d ynamics t d(nl) delay between linear and non-linear path - - 20 ns variable gamma v ariable gamma control range g var(min) minimum variable gamma setting - 0.5 - g var(max) maximum variable gamma setting - 1.5 - symbol parameter conditions min. typ. max. unit
october 1994 13 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 v ariable gamma setting vargam ( pin 2); note 3 v var(l) control voltage lower limit - 1.75 - v v var(h) control voltage upper limit - 3.25 - v v var(lt) control voltage for linear transfer - 2.5 - v i ibvar input bias current - - 0.1 m a colour difference processing c olour difference inputs uin and vin ( pins 5 and 7) v i(uin) input voltage 1.8 - - v v i(vin) input voltage 1.8 - - v i ib input bias current (pins 5 and 7) - - 0.1 m a v i(cl) input voltage level during clamping - 1.5 - v c olour difference outputs ( pins 28 and 26) d v o28 output voltage range with respect to the input (pin 28) 150 - - % d v o26 output voltage range with respect to the input (pin 26) 150 - - % v o(cl) output voltage level during clamping - 2.3 - v e off offset error transparent - - 1 % e g gain error transparent - - 5 % b bandwidth transparent 20 30 - mhz timing h orizontal window generation fh line frequency 15 - 16 khz default window setting (with respect to start bk/clp pulse) t dh(ws) default start window - 6.5 64fh - t dhd(wp) default window stop - 54.5 64fh - user window generation with i 2 c-bus (with respect to start bk/clp pulse) t hws(min) minimum start window - 4.5 64fh - t hws(max) maximum start window - 19.5 64fh - t hwp(min) minimum window stop - 26.5 64fh - t hwp(max) maximum window stop - 56.5 64fh - v ertical window generation fv vertical frequency 45 - 65 hz default window setting (start event with respect to start detected ?eld blanking, stop event with respect to start event) t dvws default window start - 64 - lines t dvdwp default window stop - 161 - lines symbol parameter conditions min. typ. max. unit
october 1994 14 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 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. user window generation with i 2 c-bus t vsw(min) minimum window start - 10 - lines t vsw(max) maximum window start - 100 - lines t vwp(min) minimum window stop - 121 - lines t vwp(max) maximum window stop - 271 - lines default window select dws; (pin 1): note 2 v isc(dws) voltage input level for window by sc blanking - - 1.5 v v id(dws) voltage input level for default window 3.5 - 5.5 v i ibdws input bias current v dws = v dda - - 10 m a sandcastle input sc; (pin 10) v i(sc) voltage input level no blanking; no clamp - 0 1.0 v with blanking; no clamp 1.2 1.5 1.8 v with blanking and clamp 3.1 3.5 3.9 v t i(sw) input sync width no vertical sync - - 15 m s with vertical sync 35 - - m s clp pulse width restoration t d(clp) internal clp pulse width difference - - 100 - ns i 2 c-bus speci?cation a ddress select adr ( pin 32) v iadr input voltage level a0 = 0 - - 1.5 v a1 = 1 3.5 - 5.5 v i ibadr input bias current - - 0.1 m a t est pins tm and dt ( pins 29 and 27) v i(test) input voltage level - - 0.5 v overall output performance t d(yuv) delay from input to output of yuv transparent - 50 100 ns t dm(yuv) delay of matching yuv transparent - 10 20 ns a w(yuv) crosstalk from window any channel - - - 60 db symbol parameter conditions min. typ. max. unit
october 1994 15 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 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 c taubp . bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb fig.4 response time constant black level loop as a function of c taubl . the dashed line = 625 lines/frame. the full line = 525 lines/frame.
october 1994 16 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb fig.5 response speed of average histogram amplitude control loop as a function of c tauhm at 60 hz field-rate. (1) minimum user window. (2) default window. (3) maximum user window, window by sandcastle blanking. r mc = 1. w eff = t hw n vw r mc . where: t hw = horizontal window width ( m s). n vw = vertical window height (lines). r mc = effective histogram measuring time within window due to miscount in percentage of t hw n vw .
october 1994 17 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb fig.6 response speed of average histogram amplitude control loop as a function of c tauhm at 50 hz field-rate. (1) minimum user window. (2) default window. (3) maximum user window. (4) window by sandcastle blanking. r mc = 1. w eff = t hw n vw r mc . where: t hw = horizontal window width ( m s). n vw = vertical window height (lines). r mc = effective histogram measuring time within window due to miscount in percentage of t hw n vw .
october 1994 18 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 fig.7 static error on average histogram amplitude (pin tauhm) as a function of effective histogram measuring time in a field. w eff = t hw n vw r mc . where: t hw = horizontal window width ( m s). n vw = vertical window height (lines). r mc = effective histogram measuring time within window due to miscount in percentage of t hw n vw .
october 1994 19 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 fig.8 adaptive gamma gain setting as a function of adgam setting in sleep mode. 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 bbbbbbbbbbbbbbbbbbbbb fig.9 non-linear amplifier non-linearity setting as a function of ampnla setting in sleep mode.
october 1994 20 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb bbbbbbbbbbbbbbbbbbbb fig.10 variable gamma setting as a function of vargam setting in sleep mode.
october 1994 21 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 application information (bus-mode) fig.11 application diagram.
october 1994 22 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 package outline fig.12 plastic shrink dual in-line package; 32 leads (400 mil) sdip32; sot232-1. 17 16 1.3 max 9.1 8.7 29.4 28.5 3.8 max 4.7 max 0.51 min 0.18 m 0.53 max 1.778 (15x) 3.2 2.8 seating plane 1.6 max 10.7 10.2 0.32 max 10.16 12.2 10.5 msa270 32 1 dimensions in mm.
october 1994 23 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation TDA9170 soldering plastic dual in-line packages b y 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. 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. r epairing soldered joints 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. definitions 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 i 2 c components data sheet status objective speci?cation this data sheet contains target or goal speci?cations for product development. preliminary speci?cation this data sheet contains preliminary data; supplementary data may be published later. product speci?cation this data sheet contains ?nal product speci?cations. limiting values 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 speci?cation 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 speci?cation. purchase of philips i 2 c components conveys a license under the philips i 2 c patent to use the components in the i 2 c system provided the system conforms to the i 2 c specification defined by philips. this specification can be ordered using the code 9398 393 40011.

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