MITSUBISHI ICs (Monitor) INARY M I L E PR M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR DESCRIPTION M52742ASP is semiconductor integrated circuit for CRT display PIN CONFIGURATION (TOP VIEW) monitor. It includes OSD blanking, OSD mixing, retrace blanking, wide band amplifer, brightness control, uniformity function. Main/sub contrast and OSD adjust function can be controlled by I2C bus. FEATURES • STRUCTURE APPLICATION INPUT(R) 2 35 OUTPUT(R) VCC1(R) 3 34 EXT FEED BACK(R) OSD IN(R) 4 33 GND2 GND 1(R) 5 32 OUTPUT(G) INPUT(G) 6 31 EXT FEED BACK(G) INPUT(SOG) 7 30 MAIN BRIGHTNESS VCC1(G) 8 29 OUTPUT(B) OSD IN(G) 9 GND 1(G) 10 INPUT(B) 11 RECOMMENDED OPERATING CONDITION Supply voltage range......................11.5 to 12.5V (V3, V8, V12, V36) 4.5 to 5.5V (V17) Rated supply voltage..................................12.0V (V3, V8, V12, V36) 5.0V (V17) MAJOR SPECIFICATION Bus controlled 3ch video pre-amp with OSD mixing function and 28 EXT FEED BACK(B) 27 RETRACE BLK IN 26 D/A OUT1 VCC1(B) 12 25 D/A OUT2 OSD IN(B) 13 24 D/A OUT3 GND 1(B) 14 23 D/A OUT4 22 GND(5V) UNIFORMITY IN 16 21 SDA VCC=5V 17 20 SCL SOG SEP OUT 18 CRT display monitor 1 36 VCC2 ABL IN 15 Bipolar silicon monolithic IC retrace blanking function 1 M52742ASP • • Frequency band width: RGB.............................200MHz (at -3dB) OSD..............................................80MHz Input :RGB.............................................................0.7V P-P (typ.) OSD..........................................3VP-P minimum (positive) BLK (for OSD)..........................3VP-P minimum (positive) Retrace BLK.............................3VP-P minimum (positive) Output :RGB..........................................................5.5V P-P (max.) OSD..............................................................5VP-P (max.) Main contrast and sub contrast can be controlled by I2C bus. Include internal and external pedestal clamp circuit OSD BLK IN 19 CLAMP PULSE IN Outline 36P4E 2 3 5 9 6 8 INPUT (R) Vcc1 (R) 12V GND 1(R) OSD IN (G) INPUT (G) Vcc1 (G) 12V SOG SEP OUT 18 16 CLAMP PULSE UNIFORMITY IN IN 19 Sync On GreenSep 36 33 1 23 24 25 26 DAC CLAMP F/B AMP CLAMP F/B AMP CLAMP F/B AMP DAC OUTPUT FOR CUT-OFF adj R SUB CONT 8bit G SUB CONT 8bit B SUB CONT 8bit OSD LEVEL 4bit OSD MIX OSD MIX OSD MIX OSD BLK IN Main CONTRAST 8bit MAIN CONTRAST MAIN CONTRAST MAIN CONTRAST Vcc2=12V GND2 SUB CONT (8bit) SUB CONTRAST SUB CONT (8bit) SUB CONTRAST SUB CONT (8bit) SUB CONTRAST BUS I/F RETRACE BLANKING RETRACE BLANKING RETRACE BLANKING 22 GND(5V) 20 SCL 21 SDA 17 Vcc 5V (DIGITAL) 28 EXT FEED BACK (B) 29 OUTPUT (B) 31 EXT FEED BACK (G) 32 OUTPUT (G) 34 EXT FEED BACK (R) 35 OUTPUT (R) n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some 7 CLAMP CLAMP CLAMP 27 30 PRE INPUT (SOG) CONTRAST (ABL) IN 15 GND 1(B) 14 Vcc1 (B) 12V 12 INPUT (B) 11 OSD IN (B) 13 GND 1(G) 10 4 OSD IN (R) RETRACE BLK IN MAIN BRIGHTNESS RY LIMINA MITSUBISHI ICs (Monitor) M52742ASP BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR BLOCK DIAGRAM 2 MITSUBISHI ICs (Monitor) INARY M I L E PR M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR ABSOLUTE MAXIMUM RATINGS (Ta=25°C) Symbol VCC12 Parameter Supply voltage (pins 3,8,12,36) VCC5 Pd Topr Tstg Vopr12 Vopr5 Supply voltage (pin 17) Power dissipation Ambient temperature Storage temperature Recommended supply 12 Recommended supply 5 Ratings 13.0 Unit V V mW °C °C V V 6.0 2403 -20 to +75 -40 to +150 12.0 5.0 ELECTRICAL CHARACTERISTICS (VCC=12V, 5V, Ta=25°C, unless otherwise noted) Symbol Parameter Test point 2,6,11 (s) RGB in CTL voltage Input 1 4,9,13 19 7 27 16 30 15 OSD OSD CP in ReT SOG UNI Bri- ABL in BLK in BLK in ght ICC1 Circuit current1 IA a a a ICC2 Circuit current2 IB a a a Vomax Output dynamic range a a Vimax Maximum input b SG2 b IN OUT SG2 a a Gv Maximum gain OUT b SG1 a ∆Gv Relative maximum gain - - VC1 Main contrast control characteristics1 OUT ∆VC1 Main contrast control relative characteristics1 VC2 b SG5 b SG5 b SG5 BUS CTL (H) Limits 00H 01H 02H 03H 04H 05H 06H 07H 08H 09H 0BH Main Sub Sub Sub OSD BLK D/A D/A D/A D/A INT cont cont cont cont Adj Adj OUT OUT OUT OUT EXT 1 2 3 1 2 3 4 Min. Typ. Max. FFH FFH FFH FFH 00H 255 255 255 255 0 a a a 4.0 5.0 a a a 4.0 5.0 a a Vari 5.0 a able b SG5 a a a 2.0 5.0 64H 100 a b SG5 a a a 2.0 5.0 FFH 255 - - - - - - b SG1 a a b SG5 a a a - - - - - - - - Main contrast control characteristics2 OUT b SG1 a a b SG5 a a a ∆VC2 Main contrast control relative characteristics2 - - - - - - - - VC3 Main contrast control characteristics3 OUT b SG1 a a b SG5 a a a ∆VC3 Main contrast control relative characteristics3 - - - - - - - - VSC1 Sub contrast control characteristics1 OUT b SG1 a a b SG5 a a a ∆VSC1 Sub contrast control relative characteristics1 - - - - - - - - OUT b SG1 a a b SG5 a a a OUT Variable Sub contrast VSC2 control characteristics2 ∆VSC2 Sub contrast control relative characteristics2 - - - - - - - - VSC3 Sub contrast control characteristics3 OUT b SG1 a a b SG5 a a a ∆VSC3 Sub contrast control relative characteristics3 - - - - - - - - 3 - - 2.0 5.0 - - 2.0 5.0 - - 2.0 5.0 - - 2.0 5.0 - - 2.0 5.0 - - 2.0 5.0 - - 00H FFH FFH FFH FFH 00H 0 255 255 255 255 0 Unit - 126 146 - 18 25 mA 6.0 8.0 - VP-P 1.6 - - VP-P 16.5 17.7 19.4 - 0.8 C8H 200 1.0 1.2 15.5 17.0 18.5 - 0.8 64H 100 mA 1.0 1.2 9.5 11.0 12.5 dB dB dB - 0.8 1.0 1.2 - 14H 20 0.2 0.4 0.6 V P-P - 0.8 1.0 1.2 - FFH C8H C8H C8H 255 200 200 200 - - FFH 64H 255 100 - - FFH 14H 255 20 - - 16.0 17.5 19.0 0.8 1.0 1.2 dB - - 64H 100 64H 100 - - 0.8 1.0 1.2 - 14H 20 14H 20 1.5 1.9 2.2 V P-P - - 0.8 1.0 1.2 - 12.0 13.5 15.0 dB MITSUBISHI ICs (Monitor) ARY N I M I L E PR M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR ELECTRICAL CHARACTERISTICS (cont.) Symbol Parameter Test point 2,6,11 (s) RGB in CTL voltage Input BUS CTL (H) 1 4,9,13 19 7 27 16 30 15 00H 01H 02H 03H 04H 05H 06H 07H 08H 09H Sub Sub Sub OSD BLK D/A D/A D/A D/A OSD OSD CP in ReT SOG UNI Bri- ABL Main cont cont cont cont Adj Adj OUT OUT OUT OUT in BLK 1 2 3 1 2 3 4 BLK in in ght VMSC Main/sub contrast control characteristics OUT b SG1 a a b SG5 a a a ∆VMSC Main/sub contrast control relative characteristics - - - - - - - - ABL1 ABL control characteristics1 OUT b SG1 a a b SG5 a a a ∆ABL1 ABL control relative characteristics1 - - - - - - - - ABL2 ABL control characteristics2 OUT b SG1 a a b SG5 a a a ∆ABL2 ABL control relative characteristics2 - - - - - - - - VB1 Brightness control characteristics1 OUT a a a b SG5 a a a ∆VB1 Brightness control relative characteristics1 - - - - - - - - VB2 Brightness control characteristics2 OUT a a a b SG5 a a a ∆VB2 Brightness control relative characteristics2 - - - - - - - - VB3 Brightness control characteristics3 OUT a a a b SG5 a a a ∆VB3 Brightness control relative characteristics3 - - - - - - - - FC1 Frequency characteristics1 (f=50MHz) OUT b SG3 a a a 5V a a ∆FC1 Frequency relative characteristics1 (f=50MHz) - - - - - - FC1’ Frequency characteristics1 (f=200MHz) OUT b SG3 a a a 5V ∆FC1’ Frequency relative characteristics1 (f=200MHz) - - - - FC2 Frequency characteristics2 (f=200MHz) OUT b SG3 a ∆FC2 Frequency relative characteristics2 (f=200MHz) - - C.T.1 Crosstalk 1 (f=50MHz) C.T.1’ C.T.2 0BH INT EXT C8H C8H C8H C8H 200 200 200 200 Unit Min. Typ. Max. 3.5 4.1 4.7 VP-P 0.8 1.0 1.2 - 4.7 5.0 5.8 VP-P 0.8 1.0 1.2 - 2.6 3.1 3.6 VP-P 0.8 1.0 1.2 - 3.3 3.7 4.1 V -0.3 0 0.3 V 1.5 1.8 2.1 V -0.3 0 0.3 V 0.7 0.9 1.1 V -0.3 0 0.3 V Vari 5.0 Va a able ria ble -2.0 0 2.5 dB - - -1.0 0 1.0 dB a a Vari 5.0 Va a able ria ble -3.0 0 3.0 dB - - - - -1.0 0 1.0 dB a a 5V a a Vari 5.0 a able -3.0 3.0 5.0 dB - - - - - - -1.0 0 1.0 dB 2bSG3 OUT(29) 6a OUT(32) 11a a a a a Vari 5.0 a able - -25 -20 dB Crosstalk 1 (f=200MHz) 2bSG3 OUT(29) 6a OUT(32) 11a a a a a Vari 5.0 a able - -15 -10 dB Crosstalk 2 (f=50MHz) 2a OUT(29) 6bSG3 OUT(35) 11a a a a a Vari 5.0 a able - -25 -20 dB C.T.2’ Crosstalk 2 (f=200MHz) 2a OUT(29) 6bSG3 OUT(35) 11a a a a a Vari 5.0 a able - -15 -10 dB C.T.3 Crosstalk 3 (f=50MHz) 2a OUT(32) 6a OUT(35) 11bSG3 a a a a Vari 5.0 a able - -25 -20 dB C.T.3’ Crosstalk 3 (f=200MHz) 2a OUT(32) 6a OUT(35) 11bSG3 a a a a Vari 5.0 a able - -15 -10 dB a 5V a 5V a 5V a 5V a 5V a 5V 2.0 5.0 Limits - - 2.0 4.0 - - - - - FFH FFH FFH FFH 255 255 255 255 - 2.0 2.0 - - 4.0 5.0 - - 2.0 5.0 - - 1.0 5.0 - - - - - - FFH 255 FFH FFH FFH 00H 255 255 255 0 00H FFH FFH FFH FFH 00H 0 255 255 255 255 0 4 MITSUBISHI ICs (Monitor) ARY N I M I L E PR M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR ELECTRICAL CHARACTERISTICS (cont.) Symbol Parameter Test point 2,6,11 (s) RGB in CTL voltage Input BUS CTL (H) 1 4,9,13 19 7 27 16 30 15 00H 01H 02H 03H 04H 05H 06H 07H 08H 09H Sub Sub Sub OSD BLK D/A D/A D/A D/A OSD OSD CP in ReT SOG UNI Bri- ABL Main cont cont cont cont Adj Adj OUT OUT OUT OUT in BLK 1 2 3 1 2 3 4 BLK in in ght Limits 0BH INT EXT Unit Min. Typ. Max. Tr Pulse characteristics1 (4VP-P) OUT b SG1 a a b SG5 a a Vari 5.0 Va a able ria ble - 1.7 - ns Tf Pulse characteristics2 (4VP-P) OUT b SG1 a a b SG5 a a Vari 5.0 Va a able ria ble - 2.2 - ns ∆ Tr Relative pulse characteristics1 a a ∆ Tr Relative pulse characteristics2 a b OUT SG1 a b SG1 a VthCP WCP Clamp pulse threshold voltage Clamp pulse minimum width b OUT SG1 b OUT SG1 OUT a a a b SG5 b SG5 Vari 5.0 a able Vari 5.0 a able a a a b SG5 a a a 2.0 5.0 a a a 2.0 5.0 a a a 2.0 5.0 a a a a a a - - - a a a a b SG5 b b a SG6 SG5 b b a SG6 SG5 b b b SG6 SG6 SG5 OUT a OTf OSD pulse characteristics2 OUT a Oaj1 OSD adjust control characteristics1 OUT a ∆Oaj1 OSD adjust control relative characteristics1 - - Oaj2 OSD adjust control characteristics2 OUT a ∆Oaj2 OSD adjust control relative characteristics2 - - - - - - - - OBLK OSD adjust control characteristics3 OUT a b SG6 a b SG5 a a a ∆OBLK OSD adjust control relative characteristics3 - - - - - - - - VthOSD OSD input threshold voltage OUT a a a a a a b b SG5 SG7 a b b SG5 SG7 a b b SG5 SG7 a OUT voltage - - b b b SG6 SG5 SG6 Variable b b SG6 a SG1 Variable Retrace BLK characteristics1 OUT a a a HBLK2 Retrace BLK characteristics2 OUT a a a HBLK3 Retrace BLK characteristics3 OUT a a a OUT a a a SonG IN Sync OUT a a a Retrace BLK voltage SS-NV SS-SV VSH VSL TDS-F 5 SOG input maximum noise voltage SOG minimum input voltage Sync output hi level Sync output lo level Sync output delay time1 - b b b SG6 SG6 SG5 HBLK1 VthRET input threshold 0 0.8 ns Vari able -0.8 0 0.8 ns FFH 255 1.0 1.5 2.0 V 0.2 0.5 - µs 08H 8 - 3.0 6.0 ns 2.0 5.0 08H 8 - 3.0 6.0 ns 2.0 5.0 0FH 15 4.6 5.4 6.2 VP-P - 0.8 1.0 1.2 - 08H 8 2.8 3.3 3.8 VP-P - 0.8 1.0 1.2 - Variable OSD pulse characteristics1 OSD BLK input -0.8 Variable OTr VthBLK threshold Vari able b SG5 - 2.0 5.0 - - 2.0 5.0 - 0 -0.1 -0.3 VP-P -0.2 0 0.2 VP-P 2.0 5.0 08H 8 2.2 2.7 3.2 V a 2.0 5.0 00H 0 2.2 2.7 3.2 V a 2.0 5.0 0FH 15 1.7 2.0 2.3 V a 2.0 5.0 06H 6 0.7 1.0 1.3 V a 2.0 5.0 00H 0 0.1 0.4 0.7 V a 2.0 5.0 08H 8 1.0 1.5 2.0 V a SG4 a 2.0 5.0 - - 0.02 VP-P 2.0 5.0 0.2 0.3 - VP-P b - 00H 0 - b b SG7 a SG5 Variable a - Variable SonG IN Sync OUT a a a a b a SG4 a Variable Sync OUT a a a a b a SG4 a 2.0 5.0 4.5 4.9 5.0 V Sync OUT a a a a b a SG4 a 2.0 5.0 0 0.3 0.6 V Sync OUT a a a a b a SG4 a 2.0 5.0 60 90 ns 0 MITSUBISHI ICs (Monitor) INARY M I L E PR M52742ASP on. ecificati to change. final sp t is not a its are subjec is h :T Notice rametric lim pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR ELECTRICAL CHARACTERISTICS (cont.) Symbol Parameter Test point 2,6,11 (s) RGB in TDS-R VOH VOL DNL Sync output delay time2 D/A H output voltage D/A L output voltage D/A nonlinearity UNI1 Uniformity characteristics1 UNI2 Uniformity characteristics2 1A- D/A input current range D/A output current range 1A+ CTL voltage Input BUS CTL (H) 1 4,9,13 19 7 27 16 30 15 00H 01H 02H 03H 04H 05H 06H 07H 08H 09H Sub Sub Sub OSD BLK D/A D/A D/A D/A OSD OSD CP in ReT SOG UNI Bri- ABL Main cont cont cont cont Adj Adj OUT OUT OUT OUT in BLK 1 2 3 1 2 3 4 BLK in in ght a a a a b a SG4 a 2.0 5.0 D/A OUT D/A OUT a a a a a a a 2.0 5.0 a a a a a a a 2.0 5.0 00H 0 D/A OUT a a a a a a a 2.0 5.0 a a a a b SG6 2.5V 2.0 5.0 a a b SG5 b SG5 a a b SG6 1.25V 2.0 5.0 Sync OUT b OUT SG1 b OUT SG1 Limits D/A OUT a a a a a a a 2.0 5.0 D/A OUT a a a a a a a 2.0 5.0 ELECTRICAL CHARACTERISTICS TEST METHOD ICC1 Circuit current1 Measuring conditions are as listed in supplementary Table. Measured with a current meter at test point IA. FFH FFH FFH FFH 00H 255 255 255 255 0 00H 00H 00H 0 0 0 00H 0 Unit Min. Typ. Max. 0 60 90 ns 4.5 5.0 5.5 VDC 00H 0 0 0.5 1.0 VDC Vari Vari Vari Vari able able able able -1.0 - 1.0 LSB FFH FFH FFH FFH 255 255 255 255 7 10 13 % 3.5 5 6.5 % 0.18 - - mA - - 1.0 mA 00H FFH FFH FFH FFH 00H 0 255 255 255 255 0 C8H C8H C8H C8H 200 200 200 200 00H 00H 0 0 0BH INT EXT 00H 0 00H 00H 0 0 00H 0 00H 00H 00H 0 0 0 Gv Maximum gain Input SG1, and read the amplitude output at OUT (29, 32, 35). The amplitude is called VOUT (29, 32, 35). Maximum gain GV is calculated by the equation below: GV=20Log VOUT (dB) 0.7 ICC2 Circuit current2 Measuring conditions are as listed in supplementary Table. ∆Gv Relative maximum gain Measured with a current meter at test point IB. Relative maximum gain DGV is calculated by the equation bellow: ∆GV= VOUT (29)/VOUT (32), Vomax Output dynamic range Decrease V30 gradually, and measure the voltage when the VOUT (32)/VOUT (35), VOUT (35)/VOUT (29) waveform output is distorted. The voltage is called VOL. Next, increase V30 gradually, and measure the voltage when the top of waveform output is distorted. The voltage is called VOH. VC1 Main contrast control characteristics1 Measuring the amplitude output at OUT (29, 32, 35). The Voltage Vomax is calculated by the equation below: measured value is called VOUT (29, 32, 35). Main contrast control Vomax = VOH-VOL characterics VC1 is calculated by the equation bellow: VOUT (dB) VC1=20Log 0.7 (V) VOH ∆VC1 Main contrast control relative characteristics1 5.0 Relative characteristics ∆VC1 is calculated by the equation bellow: Waveform output ∆VC1=VOUT (29)/VOUT (32), VOUT (32)/VOUT (35), VOL 0.0 Vimax Maximum input Increase the input signal (SG2) amplitude gradually, starting from 700mVP-P. Measure the amplitude of the input signal when the output signal starts becoming distorted. VOUT (35)/VOUT (29) VC2 Main contrast control characteristics2 Measuring condition and procedure are the same as described in VC1. ∆VC2 Main contrast control relative characteristics2 Measuring condition and procedure are the same as described in ∆VC1. 6 MITSUBISHI ICs (Monitor) ARY N I M I L E PR M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR VC3 Main contrast control characteristics3 Measuring the amplitude output at OUT (29, 32, 35). ABL1 ABL control characteristics1 Measure the amplitude output at OUT (29, 32, 35). The measured The measured value is called VOUT (29, 32, 35). value is called VOUT (29, 32, 35), and is treated as ABL1. ∆VC3 Main contrast control relative characteristics3 ∆ABL1 ABL control relative characteristics1 Measuring condition and procedure are the same as described in Relative characteristics ∆ABL1 is calculated by the equation below: ∆VC1. ∆ABL1= VOUT (29)/VOUT (32), VOUT (32)/VOUT (35), VOUT (35)/VOUT (29) VSC1 Sub contrast control characteristics1 Measure the amplitude output at OUT (29, 32, 35). The measured value is called VOUT (29, 32, 35). Sub contrast control characteristics VSC1 is calculated by the equation below: VSC1=20Log VOUT (dB) 0.7 ABL2 ABL control characteristics2 Measuring condition and procedure are the same as described in ABL1. ∆VSC1 Sub contrast control relative characteristics1 ∆ABL2 ABL control relative characteristics2 Relative characteristics ∆VSC1 is calculated by the equation below: Measuring condition and procedure are the same as described in ∆VSC1=VOUT (29)/VOUT (32), ∆ABL1. VOUT (32)/VOUT (35), VOUT (35)/VOUT (29). VSC2 Sub contrast control characteristics2 Measuring condition and procedure are the same as described in VB1 Brightness control characteristics1 Measure the DC voltage at OUT (29, 32, 35) with a voltmeter. The measured value is called VOUT (29, 32, 35), and is treated as V B1. ∆VB1 Brightness control relative characteristics1 VSC1. Relative characteristics ∆VB1 is calculated by the difference in the ∆VSC2 Sub contrast control relative characteristics2 output between the channels. ∆VB1= VOUT (29) -VOUT (32), Measuring condition and procedure are the same as described in ∆VSC1. VOUT (32) -VOUT (35), VOUT (35) -VOUT (29) VSC3 Sub contrast control characteristics3 Measuring the amplitude output at OUT (29, 32, 35). The measured value is called VSC3 VB2 Brightness control characteristics2 Measuring condition and procedure are the same as described in VB1. ∆VSC3 Sub contrast control relative characteristics3 Measuring condition and procedure are the same as described in ∆VSC1. VMSC Main/sub contrast control characteristics Measure the amplitude output at OUT (29, 32, 35). The measured value is called VMSC ∆VB2 Brightness control relative characteristics2 Measuring condition and procedure are the same as described in ∆VB1. VB3 Brightness control characteristics3 Measuring condition and procedure are the same as described in VB1. ∆VMSC Main/sub contrast control relative characteristics Relative characteristics ∆VMSC is calculated by the equation below: Measuring condition and procedure are the same as described in ∆VMSC = VOUT (29)/VOUT (32), VOUT (32)/VOUT (35), VOUT (35)/VOUT (29) 7 ∆VB3 Brightness control relative characteristics3 ∆VB1. MITSUBISHI ICs (Monitor) RY LIMINA PRE M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR FC1 Frequency characteristics1 (f=50MHz) First, SG3 to 1MHz is as input signal. Input a resister that is about C.T.2 Crosstalk2 (f=50MHz) Input SG3 (50MHz) to pin6 only, and then measure the waveform 2kΩ to offer the voltage at input pins (2, 6, 11) in order that the bot- amplitude output at OUT (29, 32, 35). The measured value is called tom of input signal is 2.5V. Control the main contrast in order that VOUT (29, 32, 35). Crosstalk C.T.2 is calculated by the equation the amplitude of sine wave output is 4.0V P-P. Control the brightness below: in order that the bottom of sine wave output is 2.0V P-P. By the same C.T.2=20 log way, measure the output amplitude when SG3 to 50MHz is as input VOUT (29, 32) VOUT (35) (dB) signal. The measured value is called VOUT (29, 32, 35). Frequency characteristics FC1 (29, 32, 35) is calculated by the equation below: C.T.2' Crosstalk2 (f=200MHz) VOUT VP-P FC1=20log (dB) Output amplitude when inputted SG3 (1MHz):4VP-P Measuring condition and procedure are the same as described in ∆FC1 Frequency relative characteristics1 (f=50MHz) Relative characteristics ∆FC1 is calculated by the difference in the C.T.3 Crosstalk3 (f=50MHz) Input SG3 (50MHz) to pin11 only, and then measure the waveform output between the channels. amplitude output at OUT (29, 32, 35). The measured value is called C.T.2, expect SG3 to 200MHz. VOUT (29, 32, 35). Crosstalk C.T.3 is calculated by the equation FC1' Frequency characteristics1 (f=200MHz) Measuring condition and procedure are the same as described in below: C.T.3=20 log table, expect SG3 to 200MHz. ∆FC1' Frequency relative characteristics1 (f=200MHz) Relative characteristics ∆FC1' is calculated by the difference in the output between the channels. (dB) C.T.3' Crosstalk3 (f=200MHz) Measuring condition and procedure are the same as described in C.T.3, expect SG3 to 200MHz. FC2 Frequency characteristics2 (f=200MHz) SG3 to 1MHz is as input signal. Control the main contrast in order that the amplitude of sine wave output is 1.0VP-P. By the same way, measure the output amplitude when SG3 to 200MHz is as input signal. The measured value is called VOUT (29, 32, 35). Frequency characteristics FC2 (29, 32, 35) is calculated by the equation below: FC2=20log VOUT (29, 32) VOUT (35) VOUT VP-P (dB) Output amplitude when inputted SG3 (1MHz):4VP-P Tr Pulse characteristics1 (4VP-P) Control the main contrast (00H) in order that the amplitude of output signal is 4.0VP-P. Control the brightness (V30) in order that the Black level of output signal is 2.0V. Measure the time needed for the input pulse to rise from 10% to 90 % (Tr1) and for the output pulse to rise from 10% to 90% (Tr2) with an active probe. Pulse characteristics Tr is calculated by the equations below : Tr = [(Tr2)2-(Tr1)2] ∆FC2 Frequency relative characteristics2 (f=200MHz) Relative characteristics ∆ FC2 is calculated by the difference in the output between the channels. ∆Tr Relative pulse characteristics1 Relative characteristics ∆Tr is calculated by the difference in the C.T.1 Crosstalk1 (f=50MHz) Input SG3 (50MHz) to pin2 only, and then measure the waveform output between the channels. amplitude output at OUT (29, 32, 35). The measured value is called VOUT (29, 32, 35). Crosstalk C.T.1 is calculated by the equation Tf Pulse characteristics2 (4VP-P) Measure the time needed for the input pulse to fall from 90% to 10% below: (Tf1) and for the output pulse to fall from 90% to 10% (Tf2) with an C.T.1=20 log VOUT (29, 32) VOUT (35) active prove. (dB) Pulse characteristics Tf is calculated by the equations below : Tf = [(Tf2)2-(Tf1)2] C.T.1' Crosstalk1 (f=200MHz) Measuring condition and procedure are the same as described in C.T.1, expect SG3 to 200MHz. 8 MITSUBISHI ICs (Monitor) RY LIMINA PRE M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR ∆Tf Relative pulse characteristics2 Relative characteristics ∆Tf is calculated by the difference in the OBLK OSD adjust control characteristics3 Measuring condition and procedure are the same as described in output between the channels. Oaj1. 100% 90% ∆OBLK OSD adjust control relative characteristics3 Measuring condition and procedure are the same as described in ∆Oaj1. 10% VthOSD OSD input threshold voltage 0% Tr1 or Tr2 Tf1 or Tf2 Reduce the SG6 input level gradually, monitoring output. Measure the SG6 level when the output reaches 0V. The measured value is VthCP Clamp pulse threshold voltage called VthOSD. Turn down the SG5 input level gradually from 5.0VP-P, monitoring Measure the top level of input SG5 at when the output pedestal VthBLK OSD BLK input threshold voltage Confirm that output signal is being blanked by the SG6 at the time. level is start to going down or unstable. Monitoring to output signal, decreasing the level of SG6. Measure the waveform output. the top level of SG6 when the blanking period is disappeared. The WCP Clamp pulse minimum width measured value is called VthBLK. Decrease the SG5 pulse width gradually from 0.5 µs, monitoring the output. Measure the input SG5 pulse width (at the point of 1.5V) at when output pedestal level is start to going down or unstable. HBLK1 Retrace BLK characteristics1 Measure the amplitude output is blanked by the SG7 at OUT (29, 32, 35). The measured value is called VOUT (29, 32, 35), and is OTr OSD pulse characteristics1 Measure the time needed for the output pulse to rise from 10% to 90% (Otr) with an active prove. treated as HBLK1. HBLK2 Retrace BLK characteristics2 Measure the amplitude output is blanked by the SG7 at OUT (29, 32, 35). The measured value is called VOUT (29, 32, 35), and is OTf OSD pulse characteristics2 Measure the time needed for the output pulse to fall from 90% to 10% (Otf) with an active prove. Oaj1 OSD adjust control characteristics1 Measure the amplitude output at OUT (29, 32, 35). The measured HBLK3 Retrace BLK characteristics3 Measure the amplitude output is blanked by the SG7 at OUT (29, 32, 35). The measured value is called VOUT (29, 32, 35), and is value is called VOUT (29,32,35), and is treated as Oaj1. treated as HBLK3. ∆Oaj1 OSD adjust control relative characteristics1 Relative characteristics ∆Oaj1 is calculated by the equation below: VthRET Retrace BLK input threshold voltage Confirm that output signal is being blanked by the SG7 at the time. ∆Oaj1=VOUT (29)/VOUT (32), Monitoring to output signal, decreasing the level of SG7. Measure VOUT (32)/VOUT (35), the top level of SG7 when the blanking period is disappeared. The VOUT (35)/VOUT (29) measured value is called VthRET. Oaj2 OSD adjust control characteristics2 Measuring condition and procedure are the same as described in Oaj1. ∆Oaj2 OSD adjust control relative characteristics2 Measuring condition and procedure are the same as described in ∆Oaj1. 9 treated as HBLK2. MITSUBISHI ICs (Monitor) ARY N I M I L E PR M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR SS-NV SOG input maximum noise voltage The sync's amplitude of SG4 be changed all white into all black, VOH D/A H output voltage Measure the DC voltage at D/AOUT. The measured value is increase from 0VP-P to 0.02VP-P. No pulse output permitted. treated as VOH. SS-SV SOG minimum input voltage The sync's amplitude of SG4 be changed all white or all black, VOL D/A L output voltage Measure the DC voltage at D/AOUT. The measured value is decrease from 0.3VP-P to 0.2VP-P. Confirm no malfunction produced treated as VOL. by noise. VSH Sync output hi level Measure the high voltage at SyncOUT. The measured value is IAO D/A output current range Electric current flow from the output of D/AOUT must be less than 1.0mA --- IA+. Electric current flow into the output of D/AOUT must be more treated as VSH. than 0.18mA --- IA-. VSL Sync output lo level Measure the low voltage at SyncOUT. The measured value is IA- treated as VSL. D/A OUT TDS-F Sync output delay time1 SyncOUT becomes High with sync part of SG4. A 1V DC Measure the time needed for the front edge of SG4 sync to fall from 50% and for SyncOUT to rise from 50% with an active prove. The measured value is treated as TDS-F, less than 90nsec. DNL D/A nonlinearity The difference of differential non-linearity of D/AOUT must be less TDS-R Sync output delay time2 Measure the time needed for the rear edge of SG4 sync to rise than ±1.0LSB. from 50% and for SyncOUT to fall from 50% with an active prove. UNI1 Uniformity characteristics1 UNI2 Uniformity characteristics2 VuniA is amplitude output at OUT (29, 32, 35), when SG6 is low The measured value is treated as TDS-R, less than 90nsec. voltage. VuniB is amplitude output at OUT (29, 32, 35), when SG6 SG4 Pedestal voltage sync (50%) (50%) is high voltage. moduration ratio UNI (UNI2) is calculated by the equation below; UNI1 (UNI2)=100 • (VuniB/VuniA-1) (%) SyncOUT TDS-F TDS-R OUT VuniB VuniA Pedestal voltage SG6 5VP-P (2.5VP-P) 10 MITSUBISHI ICs (Monitor) INARY M I L E PR M52742ASP on. ecificati to change. final sp t is not a its are subjec is h :T Notice rametric lim pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR I2C-BUS PROTOCOL (1) Slave address D7 1 D6 0 D5 0 D4 0 D3 1 D2 0 D1 0 R/W 0 =88H (2) Slave receiver format S SLAVE ADDRESS START condition SUB ADDRESS A acknowledge A DATA BYTE A P STOP condition (3) Sub address byte and data byte format bit sub add. Main contrast 8 00H Sub contrast R 8 01H Sub contrast G 8 02H Sub contrast B 8 03H OSD level 4 04H RE-BLK adjust 4 05H D/A OUT1 8 06H D/A OUT2 8 07H D/A OUT3 8 08H D/A OUT4 8 09H Pedestal clamp INT/EXT SW 1 0BH Function Notes) pedestal level INT/EXT SW 0 INT 1 EXT 11 D7 A07 0 A17 1 A27 1 A37 1 0 0 A67 1 A77 1 A87 1 A97 1 0 Data byte (top:byte format under:start condition) D6 D5 D4 D3 D2 D1 A06 A05 A04 A03 A02 A01 1 0 0 0 0 0 A16 A15 A14 A13 A12 A11 0 0 0 0 0 0 A26 A25 A24 A23 A22 A21 0 0 0 0 0 0 A36 A35 A34 A33 A32 A31 0 0 0 0 0 0 A43 A42 A41 0 0 0 1 0 0 A53 A52 A51 0 0 0 1 0 0 A66 A65 A64 A63 A62 A61 0 0 0 0 0 0 A76 A75 A74 A73 A72 A71 0 0 0 0 0 0 A86 A85 A84 A83 A82 A81 0 0 0 0 0 0 A96 A95 A94 A93 A92 A91 0 0 0 0 0 0 0 0 0 0 0 0 D0 A00 0 A10 0 A20 0 A30 0 A40 0 A50 0 A60 0 A70 0 A80 0 A90 0 AB0 0 MITSUBISHI ICs (Monitor) RY LIMINA PRE M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR TIMING REQUIREMENT OF I2C Symbol VIL VIH fSCL tBUF tHD:STA tLOW tHIGH tSU:STA tHD:DAT Parameter Input voltage LOW Input voltage HIGH SCL clock frequency Time the bus must be free before a new transmission can start Hold time start condition. After this period the first clock pulse is generated The LOW period of the clock The HIGH period of the clock Set up time for start condition (Only relevant for a repeated start condition) Hold time for I2C devices Set-up time DATA Rise time of both SDA and SCL Fall time of both SDA and SCL Set-up time for stop condition tSU:DAT tr tf tSU:STO Min. -0.5 3.0 0 4.7 4.0 4.7 4.0 4.7 0 Max. 1.5 5.5 100 - Unit V V kHz µs µs µs µs µs µs 250 4.0 1000 300 - ns ns ns µs TIMING DIAGRAM tBUF tr, tf VIH SDA VIL tHD:STA tSU:DAT tHD:DAT tSU:STA tSU:STO VIH SCL VIL tLOW S tHIGH S P S 12 MITSUBISHI ICs (Monitor) RY LIMINA PRE M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR INPUT SIGNAL SG No. Signals Pulse with amplitude of 0.7VP-P (f=30kHz). Video width of 25µs. (75%) 33µs SG1 Video signal (all white) 8µs 0.7VP-P SG2 Video signal (step wave) 0.7VP-P (Amplitude is variable.) SG3 Sine wave Sine wave amplitude of 0.7VP-P. f=1MHz, 50MHz, 200MHz (variable) (for freq. char.) Video width of 25µs. (75%) SG4 all white or all black variable. 0.7VP-P Video signal (all white, all black) 0.3VP-P Sync’s amplitude is variable. 3µs Pulse width and amplitude are variable. 0.5µs SG5 Clamp pulse 5VTTL SG6 OSD pulse 5VTTL Amplitude is variable. 5µs SG7 BLK pulse 5VTTL 5µs Amplitude is variable. * ) f=30kHz 13 MITSUBISHI ICs (Monitor) RY LIMINA PRE M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR TEST CIRCUIT OUT (35) OUT (32) V30 0 to 5V 100 470 D/A D/A D/A D/A OUT1 OUT2 OUT3 OUT4 SG7 OUT (29) a 470 470 SDA SG5 SCL C/P IN b b a SW27 SW19 100µH 36 35 34 12V out f/b 33 gnd 31 32 out 29 30 brt f/b 27 blk 28 f/b out 26 dac 25 dac 24 dac 23 22 21 20 19 dac gnd sda scl c/p M52742ASP blk R 12V osd gnd G SonG 12V osd gnd B 12V osd gnd abl UNI 5V sync 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 47µ IN (2) IN (6) SONG IN 3.3µ 0.01µ 3.3µ 0.01µ IN (11) 3.3µ 0.01µ SYNC OUT 1µ SW1 a SW2 ba SW4 a b b SW6 a SW7 ba SW9 a b b SW11 a b SW13 a V15 0 to 5V b a 1k SW16 b A IB IA 5V SG6 A 47µ 12V SG6 SG1 SG2 SG3 SG4 : MEASURE POINT * Capacitor : 0.01µF (unless otherwise specified.) Units Resistance : Ω Capacitance : F 14 MITSUBISHI ICs (Monitor) ARY N I M I L E PR M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR TYPICAL CHARACTERISTICS THERMAL DERATING MAIN CONTRAST CONTROL CHARACTERISTICS 2800 6 2403 2400 5 2000 4 1600 1442 3 1200 2 800 1 400 0 -20 0 25 50 75 100 125 150 0 00H FFH AMBIENT TEMPERATURE Ta ( °C) MAIN CONTRAST CONTROL DATA SUB CONTRAST CONTROL CHARACTERISTICS BRIGHTNESS CONTROL CHARACTERISTICS 6 6 5 5 4 4 3 3 2 2 1 1 Main contrast: Max 0 00H 0 0 FFH 2 4 SUB CONTRAST CONTROL DATA BRIGHTNESS CONTROL VOLTAGE (V DC) ABL CHARACTERISTICS OSD ADJUST CONTROL CHARACTERISTICS 6 6 5 5 4 4 3 3 2 2 1 1 Main contrast: Max Sub contrast : Max 0 0 5 ABL CONTROL VOLTAGE (VDC) 15 Sub contrast: Max 0 0H FH OSD ADJUST CONTROL DATA MITSUBISHI ICs (Monitor) RY LIMINA PRE M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR SYNC ON GREEN INPUT MIN. PULSE WIDTH 12 UNIFORMITY CHARACTERISTICS 12 (Video duty=75%) 10 10 8 8 Sync separate normal operating range 7 1m 6 6 4 4 2 2 0 0 0 0.5 INPUT SYNC AMPLITUDE (VP-P) 0 0.5 1.0 1.5 2.0 2.5 INPUT AMPLITUDE (VP-P) IN 16 MITSUBISHI ICs (Monitor) RY LIMINA PRE M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR APPLICATION EXAMPLE CRT 110V Cut Off Adj DAC OUTx4 5VTTL 470 470 BLK IN (for retrace) 470 SDA 0 to 5V 100 100µH 0.01µ 0.01µ 0.01µ 0.01µ 0.01µ 36 35 34 33 32 31 30 29 SCL Clamp pulse IN 28 27 26 25 24 23 22 21 20 19 11 12 13 14 0.01µ 15 16 17 18 M52742ASP 1 2 3 4 5 6 7 8 0.01µ 9 10 0.01µ 33µ 1µ 3.3µ 0.01µ 47µ 47µ 0.01µ 3.3µ 0.01µ 47µ 2.2µ 1k 3.3µ 75 75 75 5VTTL Uniformity IN 5VTTL 5VTTL OSD IN (B) OSD IN (G) OSD IN (R) BLK IN (for OSD) 5VTTL 0.01µ 12V 47µ 5V INPUT (R) INPUT (G) * SONG INPUT INPUT (B) * Circuit example of pin6 and pin7 same signal input 17 ABL IN 0 to 5V Sync Sep OUT •FEED BACK IS INTERNAL FEED BACK Units Resistance : Ω Capacitance : F MITSUBISHI ICs (Monitor) ARY N I M I L E PR M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR DESCRIPTION OF PIN Pin No. Name DC voltage (V ) Peripheral circuit of pins Description of function R •Input pulses G 1 1 OSD BLK IN - 3.7 to 5V B 2K GND to1.7V 2.7V •Connected to GND if not used. 0.37mA 0.37mA 2k 2 6 11 INPUT (R) INPUT (G) INPUT (B) 2k •Clamped to about 2.5V due to clamp pulses from pin 19. •Input at low impedance. 2.5 2.5V 0.3mA 3 8 12 VCC1 (R) VCC1 (G) VCC1 (B) 12 CP •Apply equivalent voltage to 3 channels. - •Input pulses 4 9 13 OSD IN (R) OSD IN (G) OSD IN (B) 3.7 to 5V 1k - 2k GND to 1.7V 2.7V 0.5mA 5 10 14 22 33 GND 1 (R) GND 1 (G) GND 1 (B) GND (5V) GND 2 GND - 7 7 INPUT (S on G) •Connected to GND if not used. When open≈ 2.5V 0.22mA 0.15mA •SYNC ON GREEN input pin for sync separation. Sync is negative. 3.33V input signal at Pin7, compare with the reference voltage of internal circuit in order to 500 separate sync signal. •When not used, set to 0.22mA OPEN. 18 MITSUBISHI ICs (Monitor) ARY N I M I L E PR M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR DESCRIPTION OF PIN (cont.) Pin No. Name DC voltage (V ) Peripheral circuit of pins Description of function 2.5V •ABL (Automatic Beam Limiter) input pin. Recommended voltage range is 0 to 5V. When ABL function is not used, set to 5V. 20k 15 ABL IN When open 2.5V 1.2k 1.2k 30k 0.5mA 15 200 16 Uniformity IN 5.75 20k 7.25V •Uniformity input pin. Recommended amplitude range is 0 to 5VP-P. 5k 16 17 VCC (5V) 5 18 18 S on G Sep OUT •Sync signal output pin, Being of open collector output type. - 41k •Input pulses 2.5 to 5V 19 Clamp Pulse IN GND to 0.5V 19 2.2V •Input at low impedance. 0.15mA 50k 20 SCL •SCL of I2C BUS (Serial clock line) VTH=2.3V 20 2k 3V 19 MITSUBISHI ICs (Monitor) RY LIMINA PRE M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR DESCRIPTION OF PIN (cont.) Pin No. Name DC voltage (V ) Peripheral circuit of pins Description of function 50k 21 SDA •SDA of I2C BUS (Serial data line) VTH=2.3V 21 2k 3V 23 24 25 26 D/A OUT •D/A output pin. Output voltage range is 0 to 5V, Min input current is 0.18mA when D / A output pin is 1V. Max output current is 1.0mA. - 50k R G 27 Retrace BLK IN B 27 2.25V •Input pulses 2.5 to 5V GND to 0.5V •Connected to GND if not used. 35k 28 31 34 29 32 35 EXT Feed Back (B) EXT Feed Back (G) EXT Feed Back (R) OUTPUT (B) OUTPUT (G) OUTPUT (R) Variable •A resistor is needed on the GND side. Set discretionally to maximum 15mA, depending on the required driving capacity. 36 Variable 50 50 36 VCC2 12 •Used to supply power to output emitter follower only. 20 MITSUBISHI ICs (Monitor) ARY N I M I L E PR M52742ASP n. cificatio change. nal spe not a fi are subject to is is h s Notice:T rametric limit pa Some BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR DESCRIPTION OF PIN (cont.) Pin No. Name DC voltage (V ) Peripheral circuit of pins Description of function 35k 30 Main Brightness •It is recommended that the IC be used between pedestal voltage 2V and 3V. - 30 APPLICATION METHOD FOR M52742SP NOTICE OF APPLICATION •Make the nearest distance between output pin and pull down resistor. CLAMP PULSE INPUT Clamp pulse width is recommended •Recommended pedestal voltage of IC output signal is 2V. above 15kHz, 1.0µsec above 30kHz, 0.5µsec above 64kHz, 0.3µsec. The clamp pulse circuit in ordinary set is a long round about way, and beside high voltage, sometimes connected to external terminal, it is very easy affected by large surge. Therefore, the Fig. shown right is recommended. 19 EXT-FEED BACK In case of application circuit example of lower figure, Set up R1, R2 which seems that the black level of the signal feedbacked from Power AMP is 1V, when the bottom of output signal is 1V. MAIN BRIGHTNESS DC:1 to 5V Power Amp Power Amp OUT Pre Amp INPUT R R OUT PUT Black level 1 to 5V M52742ASP R Feed back Black level 1 to 5V R1 R2 EXT-FEED BACK APPLICATION CIRCUIT 21