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d a t a sh eet preliminary speci?cation supersedes data of 1995 aug 01 file under integrated circuits, ic02 1996 jun 17 integrated circuits TDA9171 yuv picture improvement processor based on histogram modification and blue stretch
1996 jun 17 2 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 features picture content dependent non-linear y and u,v processing by luminance histogram analysis tv standard independent incredible blue stretch optional yc-processing. general description the TDA9171 is a transparent analog video processor with yuv input and output interfaces. the luminance transfer is controlled in a non-linear way 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 scene will be improved. so as to maintain a proper colour reproduction the saturation of the - u and - v colour difference signals are also controlled as a function of the actual non-linearity in the luminance channel. optionally, the yuv blue stretch circuitry can be activated which offsets colours near white towards blue. the supply voltage is 8 v. the device is contained in a 20 lead dual in-line package. quick reference data ordering information symbol parameter min. typ. max. unit v cc supply voltage 7.2 - 8.8 v type number package name description version TDA9171 dip20 plastic dual in-line package; 20 leads; (300 mil); no heat spreader sot146-1
1996 jun 17 3 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 block diagram fig.1 block diagram. d book, full pagewidth input amplifier non-linear amplifier histogram measurement 9 10 11 12 13 histogram processor saturation compensation timing and control ampsel 5 7 4 supply and biasing 16 15 17 output amplifier ampsel 14 blue stretch 19 18 20 1 68 3 2 uin vin yin sc ampsel tauhm blm blg uout vout yout v cc v ee v ref nlc hm1 to hm5 mbe990 TDA9171
1996 jun 17 4 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 pinning symbol pin description blg 1 blue stretch gain input uin 2 u colour difference input - uin vin 3 v colour difference input - vin nlc 4 non-linear gain control input sc 5 sandcastle input ampsel 6 amplitude select input yin 7 luminance input tauhm 8 time constant histogram input hm1 9 histogram segment memory 1 input hm2 10 histogram segment memory 2 input hm3 11 histogram segment memory 3 input hm4 12 histogram segment memory 4 input hm5 13 histogram segment memory 5 input yout 14 luminance output v ee 15 ground v cc 16 supply voltage v ref 17 reference voltage output vout 18 colour difference output - vout uout 19 colour difference output - uout blm 20 activation level blue stretch input fig.2 pin configuration. handbook, halfpage TDA9171 mbe989 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 blm uout vout v ref v cc v ee yout hm5 hm4 hm3 blg uin vin nlc sc ampsel yin tauhm hm1 hm2 functional description input selection and ampli?cation the dynamic range of the luminance input amplifier is 0.3 or 1 v (excluding sync) typically, depending on the logic level at pin ampsel (pin 6). amplitudes which extend the corresponding specified range will be clipped smoothly, however, the sync is processed to the output transparently. the non-linear gain setting will have minimum effect. optionally, in the 1 v input mode, the y output can be attenuated by a factor of 0.7 by means of an intermediate level at pin ampsel. this option is meant for correctly interfacing the combed cvbs signal to the video processor in a yc-application. the input is clamped during the logic high period of the clp, defined by the sandcastle reference, and should be dc-decoupled with an external capacitor. histogram measurement for the luminance signal the histogram distribution is measured in real-time over five segments (hm1 to hm5) in each field. during the period that the luminance is in one segment, a corresponding external capacitor 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 repeated. parts in the scene that do not contribute to the information in that scene should be omitted from the histogram measurement. no measurements are performed during the blanking period defined by the sandcastle. the miscount detector disables measurements until it detects changing parts. additionally, luminance values close to full scale (or white) do not contribute as well in order to maintain the absolute light output. this procedure is allowed because the eye is less sensitive to detail in white.
1996 jun 17 5 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 as the miscount detector shortens the effective measurement period and, because of spreads of internal and external components, the current source is controlled in a closed-loop to provide a constant 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 value at pin tauhm (pin 8). processing of the measured histogram value 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 thus reducing the flicker effects. the time constant of the averaging process is adapted to the speed of the histogram changes. 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 coming out of the scene 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 scenes, in which segments of the histogram distribution are very dominant with respect to the others, the non-linear amplification should be reduced in comparison to scenes 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, 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 by the nlc pin (non linearity control). colour compensation non-linear luminance processing influences the colour reproduction, mainly the colour saturation. therefore, the u and v signals are also processed for saturation compensation. by convention - u and - v signals must be supplied to the TDA9171. the - u and - v input signals are clamped during the logic high period of clp, defined by the sandcastle reference. in yc-applications just one colour difference channel is required for processing the chroma signal. however, external decoupling capacitors should be applied to both inputs uin and vin. the external coupling capacitor value should be such that the burst period of the chroma signal is very softly clamped. the processing is dependent on the amplitude and sign of the colour difference signals whenever the blue stretch circuitry is activated. therefore, both the polarity and the nominal amplitude of the colour difference signals are relevant when using the blue stretch facility. blue stretch the blue stretch circuit is intended to shift colours near white, with sufficient contrast values, towards more blue coloured white to give a brighter impression. the chromaticity shift is proportional to the excess of the contrast value of a white video signal with respect to a user adjustable minimum level, defined by a voltage at pin blm. in this way blue shift in, for instance, human faces can be prevented. the global amount of blue shift is defined by the voltage level at pin blg. the direction of shift in the colour triangle is fixed by hardware. it should be noted that the colour shift is different with a wrong polarity of the colour difference signals. the preferred blg and blm settings will be related to the actual nominal amplitudes of the colour difference signals. the blue stretch facility must be disabled in yc-applications by setting both blg and blm to ground.
1996 jun 17 6 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 limiting values in accordance with the absolute maximum rating system (iec 134); all voltages referenced to ground. handling all pins are protected against esd by means of internal clamping diodes. the protection circuit meets the following specification: human body model: c = 100 pf; r = 1.5 k w ; all pins >3000 v. machine model: c = 200 pf; r = 0 w ; all pins >300 v. at an ambient temperature of 90 c, all pins meet the following specification: i trigger > 100 ma or v pin > 1.5 v cc(max) i trigger <- 100 ma or v pin <- 0.5 v cc(max) except for pins 4, 7, 8 and 17 at positive trigger currents: pin 4 (nlc): i trigger > 90 ma or v pin > 1.5v cc(max) pin 7 (yin): i trigger > 90 ma or v pin > 1.5v cc(max) pin 8 (tauhm): i trigger > 90 ma or v pin > 1.5v cc(max) pin 17 (v ref ): i trigger > 90 ma or v pin > 1.5v cc(max) 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. symbol parameter min. max. unit v cc supply voltage - 0.5 +8.8 v v i/o supply voltage at any other input or output - 0.5 v cc + 0.5 v t stg storage temperature - 55 +150 c t amb operating ambient temperature - 10 +70 c
1996 jun 17 7 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 characteristics v cc =8v; t amb =25 c; unless otherwise speci?ed. symbol parameter conditions min. typ. max. unit supplies v cc supply voltage 7.2 - 8.8 v i cc supply current - 35 - ma v ref reference voltage - 5.0 - v i load load current -- 1ma luminance input and output selection l uminance input ( pin 7) v iy(es) input voltage (excluding sync) v iampsel = low - 0.3 0.45 v v iampsel = middle or high - 1.0 1.5 v v iy(cl) input voltage level during clamping - 1.5 - v i y(bias) input bias current -- 0.1 m a l uminance input voltage range selection ( pin 6) v iampsel(l) input voltage for lower range v iampsel = low -- 0.5 v v iampsel(h) input voltage for higher range v iampsel = high 3.5 5.0 5.5 v v iampsel(m) input voltage for higher range including 0.7 attenuation v iampsel = middle 1.5 - 2.5 v i ampsel(bias) input bias current -- 15 m a l uminance output ( pin 14) v oy(es) output voltage (excluding sync) v iampsel = low - 0.3 - v v iampsel = high - 1.0 - v v oy(is) output voltage (including sync) v iampsel = middle - 1.0 - v v oy(cl) output voltage level during clamping v iampsel = low - 2.8 - v v iampsel = high - 1.7 - v v iampsel = middle - 2.2 - v v on output voltage noise with respect to peak white --- 52 db b y bandwidth minimum nlc gain 8 10 - mhz b y(nl) bandwidth non-linear processing 10 -- mhz e bl black level error minimum nlc gain -- 1.0 % e g(n) nominal gain error minimum nlc gain; v iampsel = low -- 7% minimum nlc gain; v iampsel = middle or high -- 5% c l load capacitance f i = 5 mhz -- 25 pf
1996 jun 17 8 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 histogram measurement h istogram updates at hm x ( pins 9 to 13) 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 hmbias input bias current -- 0.1 m a t ime constant control tauhm ( pin 8) t thmr response speed see fig.3 --- q thms static error see fig.4 --- i thm(bias) 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 - 4 - % t d(mcp) miscount propagation delay 20% step - 25 - ns t mcd(o) miscount detection on-time each event - 0.36 -m s t mcy mismatch propagation delay and luminance delay -- 20 ns q mc(aw) miscount activation level at white no miscount - 90 - % q mc(dw) miscount deactivation level at white miscount - 87 - % processing of measured histogram values w hite point stretch g wp maximum gain luminance for white stretch (hm pattern = 00113) maximum nlc gain - 1.1 - non-linear ampli?er n on - linear gain set by hm x ( pins 9 to 13) q nl(b) segment bleeder accuracy -- 3% g nlc(min) minimum gain segment (hm pattern = 31100) maximum nlc gain - 0.36 - g nlc(max) maximum gain segment (hm pattern = 31100) maximum nlc gain - 2.28 - n on - linear setting nlc ( pin 4) g nlc non-linear control curve see fig.5 --- v inlc(l) control voltage lower limit - 0 - v v inlc(h) control voltage upper limit - 5.0 - v i inlc(bias) input bias current -- 0.5 m a symbol parameter conditions min. typ. max. unit
1996 jun 17 9 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 colour difference processing c olour difference inputs uin and vin ( pins 2 and 3) v iu(p-p) input voltage (pin 2) (peak-to-peak value) - 1.33 1.8 v v iv(p-p) input voltage (pin 3) (peak-to-peak value) - 1.05 1.8 v i uv(bias) input bias current (pins 2 and 3) -- 0.1 m a v iuv(cl) input voltage level during clamping - 1.5 - v c olour difference outputs uout and vout ( pins 19 and 18) v ou output voltage with respect to pin 2 150 -- % v ov output voltage with respect to pin 3 150 -- % v ouv(cl) output voltage level during clamping - 2.3 - v e os(uv) offset error minimum blg and blm; minimum nlc gain -- 1% g e(uv) gain error minimum blg and blm; minimum nlc gain -- 10 % g m(uv) gain mismatch minimum blg and blm; minimum nlc gain -- 5% b uv bandwidth minimum blg and blm; minimum nlc gain 10 -- mhz blue stretch c hromaticity shift d v ou variation of u output voltage in white part of 100% colour bar blm = 4.06 v -- 0.375 - v d v ov variation of v output voltage in white part of 100% colour bar blg = 3.25 v - 0.150 - v b lue stretch activation area ( pin 20) minimum contrast level range see fig.6 --- v iblm(l) input control voltage lower limit - 0 - v v iblm(h) input control voltage upper limit - 5.0 - v i blm(bias) input bias current -- 0.5 m a b lue stretch gain ( pin 1) g blg blue stretch gain range see fig.7 --- v iblg(l) input voltage lower limit - 0 - v v iblg(h) input voltage upper limit - 5.0 - v i blg(bias) input bias current -- 0.5 m a symbol parameter conditions min. typ. max. unit
1996 jun 17 10 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 timing s andcastle input ( pin 5) v isc input voltage detection level blanking no clamp 1.0 1.25 1.5 v with clamp 3.5 3.8 4.2 v t sc(sw) input sync width for no vertical sync -- 15 m s for vertical sync 35 --m s clp pulse width restoration t clp(diff) internal clp pulse width difference -- 30 - % overall output performance t ransparent mode ( no blue stretch ; no non - linear gain ) t d(yuv) delay from input to output of yuv signals minimum blg and blm; minimum nlc gain - 50 100 ns t d(yuv)m matching of yuv delay minimum blg and blm; minimum nlc gain - 10 20 ns symbol parameter conditions min. typ. max. unit fig.3 response speed of average histogram amplitude control loop as a function of c tauhm at both 50 and 60 hz field rate (r miscount = 1; c hmx = 10 nf). r miscount = ratio of effective histogram measuring time and active video in one field defined by the non-blanking periods of the sandcastle signal in one field. handbook, halfpage 0 1000 80 20 40 0 60 mbe997 200 400 600 800 t thmr (ms) c tauhm (nf) 60 hz 50 hz
1996 jun 17 11 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 fig.4 static error on average histogram amplitude (pin tauhm) as a function of effective histogram measuring time in a field (c hmx = 10 nf). r miscount = ratio of effective histogram measuring time and active video in one field defined by the non-blanking periods of the sandcastle signal in one field. handbook, halfpage 020 100 0 20 mbe995 40 60 80 4 8 12 16 q thms (%) w eff = t nonblanking_of_sc x r miscount (ms) fig.5 non-linear amplifier gain as a function of input voltage at pin nlc. handbook, halfpage 1.25 2.25 3.25 5.25 1 0.75 0.25 0 0.5 mbe996 4.25 g nlc v inlc (v)
1996 jun 17 12 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 fig.6 blue stretch activation area as a function of input voltage at pin blm. handbook, halfpage 1.25 2.05 5.25 300 0 - 900 - 300 - 600 mbe994 2.85 3.65 4.45 v iblm (v) v (mv) d vout d uout uin = vin = 0; yin = 100%; v iblg = 3.25 v. fig.7 blue stretch gain as a function of input voltage at pin blg. handbook, halfpage 1.25 2.05 5.25 300 0 - 900 - 300 - 600 mbe993 2.85 3.65 4.45 v iblg (v) v (mv) d vout d uout uin = vin = 0; yin = 100%; v iblm = 4.06 v.
1996 jun 17 13 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 test and application information the TDA9171 is especially designed for yuv applications. a typical application diagram is shown in fig.8. jumpers j1 and j2 can be used to select the appropriate luminance amplitude mode. potentiometers blg, blm and nlc can be used to apply proper blue stretch and non-linear amplifier control voltages. the TDA9171 is also prepared for yc-processing. a typical application diagram is shown in fig.9. jumpers j1 and j2 can be used to select the appropriate luminance amplitude mode. potentiometer nlc can be used to apply the proper non-linear amplifier control voltage. for the chroma processing either the u- or v-channel can be used, however both channels need to be dc-decoupled and the dc-decoupling capacitor value should be such that the burst period of the chroma signal c in is very softly clamped. the blue stretch circuitry cannot be used in yc-applications and should be switched off by connecting both blue stretch adjustments (blg and blg) to ground. fig.8 yuv application. handbook, full pagewidth TDA9171 mgd298 1 2 3 uin uout vout yout gnd v cc vin yin j1 j2 sc 4 5 6 7 8 9 10 20 blm blg 19 18 17 16 15 14 13 12 10 nf 100 nf 100 nf 10 nf 10 nf 11 220 nf 10 nf 10 nf 100 nf 10 nf 10 nf 220 k w 470 k w 470 k w 470 k w 180 k w
1996 jun 17 14 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 fig.9 yc application. handbook, full pagewidth TDA9171 mbh500 1 2 3 cin cout yout gnd v cc yin j1 j2 sc 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 10 nf 100 nf 100 nf 10 nf 10 nf 11 220 nf 10 nf 10 nf 100 nf 100 nf 100 nf 220 k w 470 k w nlc 180 k w
1996 jun 17 15 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 package outline unit a max. 1 2 b 1 cd e e m h l references outline version european projection issue date iec jedec eiaj mm inches dimensions (inch dimensions are derived from the original mm dimensions) sot146-1 92-11-17 95-05-24 a min. a max. b z max. w m e e 1 1.73 1.30 0.53 0.38 0.36 0.23 26.92 26.54 6.40 6.22 3.60 3.05 0.254 2.54 7.62 8.25 7.80 10.0 8.3 2.0 4.2 0.51 3.2 0.068 0.051 0.021 0.015 0.014 0.009 1.060 1.045 0.25 0.24 0.14 0.12 0.01 0.10 0.30 0.32 0.31 0.39 0.33 0.078 0.17 0.020 0.13 sc603 m h c (e ) 1 m e a l seating plane a 1 w m b 1 e d a 2 z 20 1 11 10 b e pin 1 index 0 5 10 mm scale note 1. plastic or metal protrusions of 0.25 mm maximum per side are not included. (1) (1) (1) dip20: plastic dual in-line package; 20 leads (300 mil) sot146-1
1996 jun 17 16 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 soldering dip, sdip, hdip, dbs and sil introduction there is no soldering method that is ideal for all ic packages. wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. however, wave soldering is not always suitable for surface mounted ics, or for printed-circuits with high population densities. in these cases reflow soldering is often used. this text gives a very brief insight to a complex technology. a more in-depth account of soldering ics can be found in our ic package databook (order code 9398 652 90011). soldering by dip or wave the maximum permissible temperature of the solder is 260 c; solder at this temperature must not be in contact with the joint for more than 5 seconds. the total contact time of successive solder waves must not exceed 5 seconds. the device may be mounted 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. repairing soldered joints apply a low voltage soldering iron (less than 24 v) to the lead(s) of the package, below the seating plane or not more than 2 mm above it. if the temperature of the soldering iron bit is less than 300 c it may remain in contact for up to 10 seconds. if the bit temperature is between 300 and 400 c, contact may be up to 5 seconds. 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. 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.
1996 jun 17 17 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 notes
1996 jun 17 18 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 notes
1996 jun 17 19 philips semiconductors preliminary speci?cation yuv picture improvement processor based on histogram modi?cation and blue stretch TDA9171 notes
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