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 MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR DESCRIPTION
M52742SP is semiconductor integrated circuit for CRT display monitor. It includes OSD blanking, OSD mixing, retrace blanking, wide band amplifre, brightness control, uniformity function. Main/sub contrast and OSD adjust function can be controlled by I 2C bus.
OSD BLK IN INPUT(R) VCC1(R) OSD IN(R) GND 1(R) INPUT(G) INPUT(SOG) VCC1(G) OSD IN(G) 1 2 3 4 5 6 7 8 9 36 VCC2 35 OUTPUT(R) 34 EXT FEED BACK(R) 33 GND2 32 OUTPUT(G) 31 EXT FEED BACK(G) 30 MAIN BRIGHTNESS 29 OUTPUT(B) 28 EXT FEED BACK(B) 27 RETRACE BLK IN 26 D/A OUT1 25 D/A OUT2 24 D/A OUT3 23 D/A OUT4 22 GND(5V) 21 SDA 20 SCL 19 CLAMP PULSE IN
PIN CONFIGURATION (TOP VIEW)
FEATURES
*
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..............................................................5V P-P (max.) Main contrast and sub contrast can be controlled by I C bus. Include internal and external pedestal clamp circuit
2
M52742SP
GND 1(G) 10 INPUT(B) 11 VCC1(B) 12 OSD IN(B) 13 GND 1(B) 14 ABL IN 15 UNIFORMITY IN 16
* *
STRUCTURE
Bipola silicon monolisic IC
APPLICATION
CRT display monitor
VCC=5V 17 SOG SEP OUT 18
RECOMMENDED OPERATING CONDITION
Supply voltage range......................11.5 to 12.5V (V3, V8, V12, V36) 4.5 to 4.4V (V17) Rated supply voltage..................................12.0V (V3, V8, V12, V36) 5.0V (V17)
Outline 36P4E
MAJOR SPECIFICATION
Bus controlled 3ch video pre-amp with OSD mixing function and retrace blanking function
1
MAIN BRIGHTNESS 30 27
RETRACE BLK IN
OSD IN (R)
4
BLOCK DIAGRAM
INPUT (R) OSD MIX AMP
2
CLAMP
SUB CONTRAST 35 OUTPUT (R)
MAIN CONTRAST
RETRACE BLANKING
VCC1 (R) 12V SUB CONT (8bit) CLAMP F/B
3 34 EXT FEED BACK (R)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
GND 1(R)
5
OSD IN (G)
9
INPUT (G) OSD MIX AMP
6
CLAMP
SUB CONTRAST
MAIN CONTRAST
RETRACE BLANKING
32 OUTPUT (G)
VCC1 (G) 12V SUB CONT (8bit) CLAMP F/B
8 31 EXT FEED BACK (G)
GND 1(G) 10
OSD IN (B) 13
INPUT (B) 11 OSD MIX AMP
CLAMP
SUB CONTRAST
MAIN CONTRAST
RETRACE BLANKING
29 OUTPUT (B)
VCC1 (B) 12V 12 SUB CONT (8bit) Main CONTRAST 8bit OSD LEVEL 4bit
GND 1(B) 14
CLAMP F/B
28 EXT FEED BACK (B)
CONTRAST (ABL) IN 15
VCC 5V 17 (DIGITAL) 21 SDA DAC R SUB CONT 8bit G SUB CONT 8bit B SUB CONT 8bit BUS I/F 20 SCL 22 GND(5V)
INPUT (SOG)
7
Sync On GreenSep
SOG SEP OUT 18 16 36 33 1 OSD BLK IN 23 24 25 26 DAC OUTPUT FOR CUT-OFF Adj
19
MITSUBISHI ICs (Monitor)
M52742SP
BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR
CLAMP PULSE UNIFORMITY IN IN
VCC2=12V GND2
2
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR ABSOLUTE MAXIMUM RATINGS (Ta=25C)
Symbol VCC Pd Topr Tstg Vopr Vopr' Parameter Supply voltage Power dissipation Ambient temperature Storage temperature Recommended supply Voltage range Ratings 13.0 2403 -20 to +75 -40 to +150 12.0 10.5 to 12.5 Unit V mW C C V V
ELECTRICAL CHARACTERISTICS (VCC=12V, 5V, Ta=25C, unless otherwise noted)
Test point 2,6,11 (s) RGB
in
Input
CTL voltage
BUS CTL (H)
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
FFH FFH FFH FFH 00H 255 255 255 255 0 00H FFH FFH FFH FFH 00H 0 255 255 255 255 0
Limits Unit Min. Typ. Max. - - 6.0 110 130 18 8.0 - 25 - - mA mA VP-P VP-P dB - dB - dB - VP-P - dB - dB - VP-P -
Symbol
Parameter
1 4,9,13 7 19 27 16 30 15 OSD OSD CP in ReT SOG UNI Bri- ABL in BLK in BLK in ght
ICC1 ICC2 Vomax Vimax Gv Gv VC1 VC1 VC2 VC2 VC3 VC3 VSC1 VSC1 VSC2 VSC2 VSC3 VSC3
Circuit current1 Circuit current2
Output dynamic range
IA IB OUT
a a b SG2
a a a a a - a - a - a - a - a - a -
a a a a a - a - a - a - a - a - a -
b SG5 b SG5 b SG5 b SG5 b SG5 - b SG5 - b SG5 - b SG5 - b SG5 - b SG5 - b SG5 -
a a a a a - a - a - a - a - a - a -
a a a a a - a - a - a - a - a - a -
a a
4.0 5.0 4.0 5.0
Vari a able 5.0 a a - a - a - a - a - a - a - 2.0 5.0 2.0 5.0 - -
64H 100
Maximum input Maximum gain Relative maximum gain
Main contrast control characteristics1 Main contrast control relative characteristics1 Main contrast control characteristics2 Main contrast control relative characteristics2 Main contrast control characteristics3 Main contrast control relative characteristics3 Sub contrast control characteristics1 Sub contrast control relative characteristics1
Sub contrast control characteristics2
b IN OUT SG2 OUT - OUT - OUT - OUT - OUT - OUT - OUT - b SG1 -
1.6
Variable
FFH 255
16.5 17.7 19.4 0.8 1.0 1.2
-
C8H 200
b SG1 - b SG1 - b SG1 - b SG1 - b SG1 - b SG1 -
2.0 5.0 - -
15.5 17.0 18.5 0.8 1.0 1.2
-
64H 100
2.0 5.0 - -
9.0 10.5 12.0 0.8 0.2 0.8 1.0 0.4 1.0 1.2 0.6 1.2
-
14H 20
2.0 5.0 - -
-
FFH C8H C8H C8H 255 200 200 200
2.0 5.0 - -
15.8 17.3 18.8 0.8 1.0 1.2
----
FFH 64H 255 100 64H 100 64H 100
2.0 5.0 - -
11.5 13.0 14.5 0.8 1.4 0.8 1.0 1.7 1.0 1.2 2.0 1.2
Sub contrast control relative characteristics2 Sub contrast control characteristics3 Sub contrast control relative characteristics3
----
FFH 14H 255 20 14H 20 14H 20
2.0 5.0 - -
----
3
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR
ELECTRICAL CHARACTERISTICS (cont.)
Symbol Parameter Test point 2,6,11 (s) RGB
in
Input
CTL voltage
BUS CTL (H)
0BH INT EXT
Limits Unit Min. Typ. Max. 3.4 0.8 4.1 0.8 2.3 0.8 3.3 -0.3 1.5 -0.3 0.7 -0.3 -2.0 -1.0 4.0 1.0 4.9 1.0 2.8 1.0 3.7 0 1.8 0 0.9 0 0 0 0 0 3.0 0 -25 -15 -25 -15 -25 -15 4.6 1.2 5.7 1.2 3.3 1.2 4.1 0.3 2.1 0.3 1.1 0.3 2.5 1.0 3.0 1.0 5.0 1.0 -20 -10 -20 -10 -20 -10 VP-P - VP-P - VP-P - V V V V V V dB dB dB dB dB dB dB dB dB dB dB dB
1 4,9,13 7 19 27 16 30 15 00H 01H 02H 03H 04H 05H 06H 07H 08H 09H Sub Sub Sub D/A D/A D/A D/A OSD OSD CP in ReT SOG UNI Bri- ABL Main cont cont cont OSD BLK OUT OUT OUT OUT cont Adj Adj in BLK 1 2 3 1 2 3 4 BLK in in ght
VMSC
VMSC
Main/sub contrast control characteristics2
Main/sub contrast control relative characteristics2
OUT - OUT - OUT - OUT - OUT - OUT - OUT - OUT - OUT -
b SG1 - b SG1 - b SG1 - a - a - a - b SG3 - b SG3 - b SG3 -
a - a - a - a - a - a - a - a - a - a a a a a a
a - a - a - a - a - a - a - a - a - a a a a a a
b SG5 - b SG5 - b SG5 - b SG5 - b SG5 - b SG5 - a 5V - a 5V - a 5V - a 5V a 5V a 5V a 5V a 5V a 5V
a - a - a - a - a - a - a - a - a - a a a a a a
a - a - a - a - a - a - a - a - a - a a a a a a
a - a - a - a - a - a -
2.0 5.0 - -
C8H C8H C8H C8H 200 200 200 200
----
FFH FFH FFH FFH 255 255 255 255
ABL1 ABL1 ABL2 ABL2 VB1 VB1 VB2 VB2 VB3 VB3 FC1 FC1 FC1' FC1' FC2 FC2 C.T.1 C.T.1' C.T.2 C.T.2' C.T.3 C.T.3'
ABL control characteristics1
ABL control relative characteristics1
2.0 4.0 - -
ABL control characteristics2
ABL control relative characteristics2
2.0 2.0 - -
Brightness control characteristics1 Brightness control relative characteristics1 Brightness control characteristics2 Brightness control relative characteristics2 Brightness control characteristics3 Brightness control relative characteristics3 Frequency characteristics1 (f=50MHz)
Frequency relative characteristics1 (f=50MHz)
4.0 5.0 - -
2.0 5.0 - -
1.0 5.0 - -
Va Vari a able 5.0 ria ble
-
-
-
-
FFH FFH FFH 00H 255 255 255 0 00H FFH FFH FFH FFH 00H 0 255 255 255 255 0
Frequency characteristics1 (f=150MHz)
Frequency relative characteristics1 (f=150MHz)
Va Vari a able 5.0 ria ble
-3.0 -1.0 -3.0 -1.0
- Vari a able 5.0 - - -
FFH 255
Frequency characteristics2 (f=150MHz)
Frequency relative characteristics2 (f=150MHz)
Crosstalk 1 (f=50MHz) Crosstalk 1 (f=150MHz) Crosstalk 2 (f=50MHz) Crosstalk 2 (f=150MHz) Crosstalk 3 (f=50MHz) Crosstalk 3 (f=150MHz)
2bSG3 OUT(29) 6a OUT(32) 11a 2bSG3 OUT(29) 6a OUT(32) 11a 2a OUT(29) 6bSG3 OUT(35) 11a 2a OUT(29) 6bSG3 OUT(35) 11a 2a OUT(32) 6a OUT(35) 11bSG3 2a OUT(32) 6a OUT(35) 11bSG3
Vari a able 5.0 Vari a able 5.0 Vari a able 5.0 Vari a able 5.0 Vari a able 5.0 Vari a able 5.0
- - - - - -
4
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR
ELECTRICAL CHARACTERISTICS (cont.)
Symbol Parameter Test point 2,6,11 (s) RGB
in
Input
CTL voltage
BUS CTL (H)
0BH INT EXT
Limits Unit Min. Typ. Max. - - 1.7 2.8 - - ns ns
1 4,9,13 7 19 27 16 30 15 00H 01H 02H 03H 04H 05H 06H 07H 08H 09H Sub Sub Sub D/A D/A D/A D/A OSD OSD CP in ReT SOG UNI Bri- ABL Main cont cont cont OSD BLK OUT OUT OUT OUT cont Adj Adj in BLK 1 2 3 1 2 3 4 BLK in in ght
Tr Tf
Pulse characteristics1 (4VP-P) Pulse characteristics2 (4VP-P)
OUT OUT
b SG1 b SG1 b SG1 b SG1 b SG1 b SG1 a a a - a - a - a
a a
a a
b SG5 b SG5 b SG5
Variable
a a
a a
Va Vari a able 5.0 ria ble Va Vari a able 5.0 ria ble
VthCP
Clamp pulse threshold voltage Clamp pulse minimum width
Pedestal voltage temperature characteristics1 Pedestal voltage temperature characteristics2
OUT
a
a
a
a
a
2.0 5.0
FFH 255
1.0
1.5
2.0
V
WCP PDCH PDCL OTr OTf Oaj1 Oaj1 Oaj2 Oaj2 OBLK
OBLK
OUT OUT OUT OUT OUT OUT - OUT - OUT - OUT OUT OUT OUT OUT OUT
a a a
a a a
b SG5
Variable
a a a a a a - a - a - a a
a a a a a a - a - a - a a
a a a a a a - a - a - a a a a a a
2.0 5.0 2.0 5.0 2.0 5.0 2.0 5.0 2.0 5.0 2.0 5.0 - -
08H 8
0.2 -0.3 -0.3 - - 4.6 0.8 2.8 0.8 0
-0.15
0.5 0 0 3.0 3.0 5.4 1.0 3.3 1.0 0.1
- 0.3 0.3 6.0 6.0 6.2 1.2 3.8 1.2 0.3
s V V ns ns VP-P - VP-P - VP-P VP-P V V V V V V
b SG5 b SG5
OSD pulse characteristics1 OSD pulse characteristics2
OSD adjust control characteristics1 OSD adjust control relative characteristics1 OSD adjust control characteristics2 OSD adjust control relative characteristics2 OSD adjust control characteristics3 OSD adjust control relative characteristics3
b b a SG6 SG5 b b a SG6 SG5 b b b SG6 SG6 SG5 - - -
0FH 15
-
08H 8
b b b SG6 SG6 SG5 -
b SG6
2.0 5.0 - -
- a -
- b SG5 -
-
00H 0
2.0 5.0 - -
-
-
08H 8
0 0.15 2.7 2.7 2.0 1.0 0.4 1.5 - 3.2 3.2 2.3 1.3 0.7 2.0
VthOSD
OSD input threshold voltage OSD BLK input
b b b SG6 SG6 Variable SG5
2.0 5.0 2.0 5.0 2.0 5.0 2.0 5.0 2.0 5.0 2.0 5.0
2.2 2.2
0FH 15
VthBLK threshold
voltage
b b SG6 a SG1 Variable
b SG5
00H 0
HBLK1 HBLK2 HBLK3
Retrace BLK characteristics1 Retrace BLK characteristics2 Retrace BLK characteristics3 Retrace BLK
a a a a
a a a a
a a a a
b b SG5 SG7 a b b SG5 SG7 a b b SG5 SG7 a
b b SG7 SG5 Variable a
1.7 0.7 0.1 1.0 -
06H 6
00H 0
VthRET input threshold
voltage
08H 8
SS-NV
SS-SV VSH VSL TDS-F
SOG input maximum noize voltage SOG minimum input voltage Sync output hi level Sync output lo level Sync output delay time1
SonG IN Sync OUT
a
a
a
a
a SG4 a
Variable
b
2.0 5.0
0.02
VP-P
SonG IN Sync OUT
a a a a
a a a a
a a a a
a a a a
a SG4 a
Variable
b
2.0 5.0 2.0 5.0 2.0 5.0 2.0 5.0
0.2 4.5 0 0
0.3 4.9 0.3 60
- 5.0 0.6 90
VP-P V V ns
Sync OUT
b a SG4 a b a SG4 a b a SG4 a
Sync OUT
Sync OUT
5
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR
ELECTRICAL CHARACTERISTICS (cont.)
Symbol Parameter Test point 2,6,11 (s) RGB
in
Sync OUT
Input
CTL voltage
BUS CTL (H)
0BH INT EXT
Limits Unit Min. Typ. Max. 0 60 5.0 0.5 - - 0 0 10 5 90 5.5 1.0 0.4 1.0 0.8 0.8 13 6.5 ns VDC VDC mA LSB ns ns % %
1 4,9,13 7 19 27 16 30 15 00H 01H 02H 03H 04H 05H 06H 07H 08H 09H Sub Sub Sub D/A D/A D/A D/A OSD OSD CP in ReT SOG UNI Bri- ABL Main cont cont cont OSD BLK OUT OUT OUT OUT cont Adj Adj in BLK 1 2 3 1 2 3 4 BLK in in ght
TDS-R VOH VOL IAO DNL Tr Tf UNI1 UNI2
Sync output delay time2 D/A H output voltage D/A L output voltage D/A output current range D/A nonlinearity
Relative pulse characteristics1 Relative pulse characteristics2 Uniformity characteristics1 Uniformity characteristics2
a a a a a
a a a a a a a a a
a a a a a a a a a
a a a a a b SG5 b SG5 b SG5 b SG5
b a SG4 a
2.0 5.0 2.0 5.0 2.0 5.0 2.0 5.0 2.0 5.0
Vari abl e Vari abl e
C8H C8H C8H C8H 200 200 200 200 FFH FFH FFH FFH 00H 255 255 255 255 0 00H FFH FFH FFH FFH 00H 0 255 255 255 255 0
D/A OUT D/A OUT D/A OUT D/A OUT
a a a a a a a a
a a a a a a a a
a a a a
4.5 0 -1.0 -1.0 -0.8 -0.8 7 3.5
00H 0
00H 0
00H 0
00H 0
Vari Vari Vari Vari abl abl abl abl e e e e Vari Vari Vari Vari abl abl abl abl e e e e
FFH FFH FFH FFH 255 255 255 255
b OUT SG1 b OUT SG1 b OUT SG1 b OUT SG1
Vari a able 5.0 Vari a able 5.0
b SG6 2.5V
b SG6 1.25V
2.0 5.0 2.0 5.0
ELECTRICAL CHARACTERISTICS TEST METHOD
ICC1 Circuit current1 Measuring conditions are as listed in supplementary Table. Mesured with a current meter at test point IA. ICC2 Circuit current2 Measureing conditions are as listed in supplemtary Table. Measured with a current meter at test point IB. Vomax Output dynamic range Decrease V30 gradually, and measure the voltage when the 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. Voltage Vomax is calculated by the equation below: Vomax = VOH-VOL
(V) VOH 5.0 Waveform output VOL 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 Gv Relative maximum gain Relative maximum gain GV is calculated by the equation bellow: GV= VOUT (29)/VOUT (32), VOUT (32)/VOUT (35), VOUT (35)/VOUT (29) VC1 Main contrast control characteristics1 Measureing the amplitude output at OUT (29, 32, 35). The measuredvalue is called VOUT (29, 32, 35). Main contrast control characterics VC1 is calculated by the equation bellow: VOUT (dB) VC1=20Log 0.7 VC1 Main contrast control relative characteristics1 Relative characteristics VC1 is calculated by the equation bellow: VC1=VOUT (29)/VOUT (32), VOUT (32)/VOUT (35), 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. VOUT (dB) 0.7
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.
6
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR
VC3 Main contrast control characteristics3 Measuring condition and procedure are the same as described in VC1. VC3 Main contrast control relative characteristics3 Measuring condition and procedure are the same as described in VC1. VSC1 Sub contrast control characteristics1 Measur 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
ABL1 ABL control characteristics1 Measure the amplitude output at OUT (29, 32, 35). The measured value is called VOUT (29, 32, 35), and is ttreated as ABL1. ABL1 ABL control relative characteristics1 Relative characteristics ABL1 is calculated by the equation below: ABL1= VOUT (29)/VOUT (32), VOUT (32)/VOUT (35), VOUT (35)/VOUT (29) ABL2 ABL control characteristics2 Measuring condition and procedure are the same as described in ABL1. ABL2 ABL control relative characteristics2 Measuring condition and procedure are the same as described in ABL1. 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 ttreated as VB1. VB1 Brightness control relative characteristics1 Relative characteristics VB1 is calculated by the difference in the output between the channels. VB1= VOUT (29)/VOUT (32), VOUT (32)/VOUT (35), VOUT (35)/VOUT (29)
VSC1 Sub contrast control relative characteristics1 Relative characteristics VSC1 is calculated by the equation below: VSC1= VOUT (29)/VOUT (32), VOUT (32)/VOUT (35), VOUT (35)/VOUT (29). VSC2 Sub contrast control characteristics2 Measuring condition and procedure are the same as described in VSC1. VSC2 Sub contrast control relative characteristics2 Measuring condition and procedure are the same as described in VSC1. VSC3 Sub contrast control characteristics3 Measuring condition and procedure are the same as described in VSC1. VSC3 Sub contrast control relative characteristics3 Measuring condition and procedure are the same as described in VSC1. VMSC Main/sub contrast control characteristics2 Measure the amplitude output at OUT (29, 32, 35). The measured value is called VOUT (29, 32, 35). Main/Sub contrast control characteristics VMSC1 is calculated by the equation below: VMSC1=20Log VOUT (dB) 0.7
VB2 Brightness control characteristics2 Measuring condition and procedure are the same as described in VB1. 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. VB3 Brightness control relative characteristics3
VMSC Main/sub contrast control relative characteristics2 Relative characteristics VMSC1 is calculated by the equation below: VMSC1= VOUT (29)/VOUT (32), VOUT (32)/VOUT (35), VOUT (35)/VOUT (29)
Measuring condition and procedure are the same as described in VB1.
7
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
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 2k to offer the voltage at input pins (2, 6, 11) in order that the bottom of input signal is 2.5V. Control the main contrast in order that the amplitude of sine wave output is 4.0VP-P. Control the brightness in order that the bottom of sine wave output is 2.0VP-P. By the same way, measure the output amplitude when SG3 to 50MHz is as input signal. The measured value is called VOUT (29, 32, 35). Frequency characteristics FC1 (29, 32, 35) is calculated by the equation below: VOUT VP-P FC1=20log (dB) Output amplitude when inputed SG3 (1MHz):4VP-P
C.T.2 Crosstalk2 (f=50MHz) Input SG3 (50MHz) to pin6 only, and then measure the waveform amplitude output at OUT (29, 32, 35). The measured value is called VOUT (29, 32, 35). Crosstalk C.T.2 is calculated by the equation below: C.T.2=20 log VOUT (29, 32) VOUT (35) (dB)
C.T.2' Crosstalk2 (f=150MHz) Measuring condition and procedure are the same as described in C.T.2, expect SG3 to 150MHz. C.T.3 Crosstalk3 (f=50MHz) Input SG3 (50MHz) to pin11 only, and then measure the waveform amplitude output at OUT (29, 32, 35). The measured value is called VOUT (29, 32, 35). Crosstalk C.T.3 is calculated by the equation below: C.T.3=20 log VOUT (29, 32) VOUT (35) (dB)
FC1 Frequency relative characteristics1 (f=50MHz) Relative characteristics FC1 is calculated by the difference in the output between the channels. FC1' Frequency characteristics1 (f=150MHz) Measuring condition and procedure are the same as described in table, expect SG3 to 150MHz. FC1' Frequency relative characteristics1 (f=150MHz) Relative characteristics FC1' is calculated by the difference in the output between the channels. FC2 Frequency characteristics2 (f=150MHz) 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 150MHz 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: FC1=20log VOUT VP-P (dB) Output amplitude when inputed SG3 (1MHz):4VP-P
C.T.3' Crosstalk3 (f=150MHz) Measuring condition and procedure are the same as described in C.T.3, expect SG3 to 150MHz. 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 prove. Pulse characteristics TR is calculated by the equations below :
FC2 Frequency relative characteristics2 (f=150MHz) Relative characteristics FC2 is calculated by the difference in the output between the channels. C.T.1 Crosstalk1 (f=50MHz) Input SG3 (50MHz) to pin2 only, and then measure the waveform 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 below: C.T.1=20 log VOUT (29, 32) VOUT (35) (dB)
TR= [(Tr2)2-(Tr1)2]
Tr Relative pulse characteristics1 Relative characteristics Tr is calculated by the difference in the output between the channels. Tf Pulse characteristics2 (4VP-P) Measure the time needed for the input pulseto fall from 90% to 10% (Tf1) and for the output pulse to fall from 90% to 10% (Tf2) with an active prove. Pulse characteristics TF is calculated by the equations below : TR= [(Tf2)2-(Tf1)2]
C.T.1' Crosstalk1 (f=150MHz) Measuring condition and procedure are the same as described in C.T.1, expect SG3 to 150MHz.
8
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR
Tf Relative pulse characteristics2 Relative characteristics Tf is calculated by the difference in the output between the channels.
100% 90%
Oaj1 OSD adjust control relative characteristics1 Relative characteristics Oaj1 is calculated by the equation below: Oaj1= VOUT (29)/VOUT (32), VOUT (32)/VOUT (35), VOUT (35)/VOUT (29) Oaj2 OSD adjust control characteristics2 Measuring condition and procedure are the same as described in Oaj1.
10% 0% Tr1 or Tr2 Tf1 or Tf2
Oaj2 OSD adjust control relative characteristics2 Measuring condition and procedure are the same as described in Oaj1. OBLK OSD adjust control characteristics3 Measuring condition and procedure are the same as described in Oaj1. OBLK OSD adjust control relative characteristics3 Measuring condition and procedure are the same as described in Oaj1. VthOSD OSD input threshold voltage
VthCP Clamp pulse threshold voltage Turn down the SG5 input level gradually from 5.0VP-P, monitoring the waveform output. Measure the top level of input pulse when the output pedestal voltage turn decrease with unstable. WCP Clamp pulse minimum width Decrease the SG5 pulse width gradually from 0.5s, monitoring the output. Measure the SG5 pulse width (a point of 1.5V) when the output pedestal voltage turn decrease with unstable. PDCH Pedestal voltage temperature characteristics1 Measure the pedestal voltage at 25C. The measured value is called PDC1. Measure the pedestal voltage at temperature of -20C. The measured value is called PDC2. Pedestal voltage temperature characteristics 1 is calculated by the equation below: PDCH=PDC1-PDC2 PDCL Pedestal voltage temperature characteristics2 Measure the pedestal voltage at 25C. The measured value is called PDC1. Measure the pedestal voltage at temperature of 75C. The measured value is called PDC3. Pedestal voltage temperature characteristics 2 is calculated by the equation below: PDCL=PDC1-PDC3 OTr OSD pulse characteristics1 Measure the time needed for the output pulse to rise from 10% to 90% (OTR) with an active prove. 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 value is called VOUT (29,32,35), and is treated as Oaj1.
Reduce the SG6 input level gradually, monitoring output. Measure the SG6 level when the output reaches 0V. The measured value is called VthOSD. VthBLK OSD BLK input threshold voltage Confirm that output signal is being blanked by the SG6 at the time. Monitoring to output signal, decreasing the level of SG6. Measure the top level of SG6 when the blanking period is disappeared. The measured value is called VthBLK. 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 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 treated as HBLK2. 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 treated as HBLK3. VthRET Retrace BLK input threshold voltage Confirm that output signal is being blanked by the SG7 at the time. Monitoring to output signal, decreasing the level of SG7. Measure the top level of SG7 when the blanking period is disappeared. The measured value is called VthRET.
9
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR
SS-NV SOG input maximum noize voltage The sync's amplitude of SG4 be changed all white into all black, increase from 0VP-P to 0.02VP-P. No pulse output permitted. SS-SV SOG minimum input voltage The sync's amplitude of SG4 be changed all white or all black, decrease from 0.3VP-P to 0.2VP-P. Confirm no malfunction produced by noise. VSH Sync output hi level Measure the high voltage at SyncOUT. The measured value is treated as VSH. VSL Sync output lo level Measure the low voltage at SyncOUT. The measured value is treated as VSL. TDS-F Sync output delay time1 SyncOUT becomes High with sync part of SG4. 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. TDS-R Sync output delay time2 Measure the time needed for the rear edge of SG4 sync to rise from 50% and for SyncOUT to fall from 50% with an active prove. The measured value is treated as TDS-R, less than 90nsec.
OUT SG4 Pedestal voltage sync (50%) (50%) SG6 VuniB VuniA Pedestal voltage 5VP-P (2.5VP-P)
VOH D/A H output voltage Measure the DC voltage at D/AOUT. The measured value is ttreated as VOH. VOL D/A L output voltage Measure the DC voltage at D/AOUT. The measured value is ttreated as VOL. IAO D/A output current range Electric current flow from the output of D/AOUT must be less than 1.0mA. Electric current flow in the output of D/AOUT must be less than 0.4mA. DNL D/A nonlinearity The difference of differential non-linearity of D/AOUT must be less than 1.0LSB. UNI1 Uniformity characteristics1 UNI2 Uniformity characteristics2 VuniA is amplitude output at OUT (29, 32, 35), when SG6 is low voltage. VuniB is amplitude output at OUT (29, 32, 35), when SG6 is high voltage. moduration ratio UNI (UNI2) is calculated by the equation below; UNI1 (UNI2)=100(VuniB/VuniA-1) (%)
SyncOUT
TDS-F
TDS-R
10
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR I2C-BUS PROTOCOL
(1) Slave address D7 1 D6 1 D5 0 D4 1 D3 1 D2 1 D1 0 R/W 0
=DCH
(2) Slave receiver format
S SLAVE ADDRESS A acknowledg SUB ADDRESS A DATA BYTE A P STOP condition
START condition
(3) Sub address byte and data byte format Function Main contrast Sub contrast R Sub contrast G Sub contrast B OSD level RE-BLK adjust D/A OUT1 D/A OUT2 D/A OUT3 D/A OUT4 Pedestal clamp INT/EXT SW
Notes) pedestal level INT/EXT SW 0INT 1EXT
bit 8 8 8 8 4 4 8 8 8 8 1
sub add. 00H 01H 02H 03H 04H 05H 06H 07H 08H 09H 0BH
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
11
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
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 tSU:DAT tr tf tSU:STO 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 rerevant 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 Min. -0.5 3.0 0 4.7 4.0 4.7 4.0 4.7 0 250 - - 4.0 Max. 1.5 5.5 100 - - - - - - - 1000 300 - Unit V V kHz s s s s s s ns ns ns s
TIMING DIAGRAM
tr, tf tBUF
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)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
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 25s. (75%)
33s
SG1
Video signal
(all white)
8s
0.7VP-P
SG2
Video signal (step wave) 0.7VP-P (Amplitude is partially variable.)
SG3 Sine wave
(for freq. char.)
Sine wave amplitude of 0.7VP-P. f=1MHz, 50MHz, 150MHz (variable)
Video width of 25s. (75%)
SG4
Video signal 0.7VP-P
(all white, all black)
3s
all white or all black variable.
0.3VP-P Sync's amplitude is variable.
Pulse width and amplitude are variable.
0.5s
SG5 Clamp pulse
5VTTL
SG6 OSD pulse
5VTTL
Amplitude is partially variable.
5s
SG7 BLK pulse
5VTTL
5s
Amplitude is partially variable.
) f=30kHz
13
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR TEST CIRCUIT
OUT (35) 100 470 100H
OUT (32) V30 0 to 5V 470
OUT (29)
SG7
D/A D/A D/A D/A OUT1 OUT2 OUT3 OUT4
SDA
SCL
SG5 C/P IN b a
a 470
b SW27
SW19
36 12V
35 out
34 f/b
33 gnd
32 out
31 f/b
30 brt
29 out
28 f/b
27 blk
26 dac
25 dac
24 dac
23 dac
22 gnd
21 sda
20 scl
19 c/p
M52742SP
blk 1
R 2
12V 3
osd 4
gnd 5
G 6
SonG 7
12V 8
osd 9
gnd 10
B 11
12V 12
osd 13
gnd 14
abl 15
UNI 16
5V 17 47
sync 18
IN (2) 3.3 0.01
IN (6) SONG IN 3.3 0.01
100k IN (11) 3.3 0.01 1 V15 0 to 5V b a
SYNC OUT
SW1 a
SW2 ba
b
SW4 a
b
SW6 a
SW7 ba
b
SW9 a
b
SW11 a
b
SW13 a
SW16 b
1k
A IB IA A 47 12V SG6 SG1 SG2 SG3 SG6 5V
SG4 : MEASURE POINT Condenser : 0.01F (unless otherwise specified.)
Units Resistance : Capacitance : F
14
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR TYPICAL CHARACTERISTICS
THERMAL DERATING
2800
MAIN CONTRAST CONTROL CHARACTERISTICS
6
POWER DISSIPATION Pd (mW)
OUTPUT AMPLITUDE (VP-P)
2403 2400 2000 1600 1200 800 400 0 -20
5 4 3 2 1 0 00H
1442
Sub contrast: Max
0
25
50
75
100
125
150
FFH
AMBIENT TEMPERATURE Ta (C)
MAIN CONTRAST CONTROL DATA
SUB CONTRAST CONTROL CHARACTERISTICS
6
BRIGHTNESS CONTROL CHARACTERISTICS
6
OUTPUT DC VOLTAGE (VDC)
OUTPUT AMPLITUDE (VP-P)
5 4 3 2 1 0 00H
5 4 3 2 1 0
Main contrast: Max
FFH
0
2
4
SUB CONTRAST CONTROL DATA
BRIGHTNESS CONTROL VOLTAGE (VDC)
ABL CHARACTERISTICS
6
OSD ADJUST CONTROL CHARACTERISTICS
6
OUTPUT AMPLITUDE (VP-P)
OUTPUT AMPLITUDE (VP-P)
5 4 3 2 1 0 0 5
5 4 3 2 1 0 0H
Main contrast: Max Sub contrast : Max
FH
ABL CONTROL VOLTAGE (VDC)
OSD ADJUST CONTROL DATA
15
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR
SYNC ON GREEN INPUT MIN. PULSE WIDTH
12 (Video duty=75%) 10 12 10 8 6 4 2 0 0 0.5 0
UNIFORMITY CHARACTERISTICS
8 Sync separate normal operating range 6 4 2
7 100k 1
0
MODURATION RATIO (%)
SYNC DUTY (%)
0.5
1.0
1.5
2.0
2.5
INPUT SYNC AMPLITUDE (VP-P)
IN
INPUT AMPLITUDE (VP-P)
16
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
BUS CONTROLLED 3-CHANNEL VIDEO PREAMP FOR CRT DISPLAY MONITOR APPLICATION EXAMPLE
CRT 110V
Cut Off Adj
DAC OUTx4
5VTTL BLK IN (for retrace) SDA 0 to 5V 100 100H 36 35 34 33 32 31 0.01 30 29 28 27 0.01 0.01 0.01 0.01 26 25 24 23 22 21 20 19 SCL Clamp pulse IN
470
470
470
M52742SP
1
2
3
4 0.01
5
6
7 100k 1
8
9
10 0.01
11
12
13
14
15
16
17
18
0.01 0.01 ABL IN 1k Sync Sep OUT
3.3
0.01
47 3.3
0.01
47 3.3
0.01
47
0 to 5V
75 5VTTL 5VTTL
75 5VTTL
75
5VTTL
Uniformity IN OSD IN (B) OSD IN (G) OSD IN (R) BLK IN (for OSD) 0.01 47
12V
5V INPUT (R) INPUT (G) SONG INPUT INPUT (B) *FEED BACK IS INTERNAL FEED BACK Units Resistance : Capacitance : F
Circuit example of pin6 and pin7 same signal input
17
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
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 G
Input pulses
3.7 to 5V 1.7V maximum 2.7V
1
OSD BLK IN
-
1 B
0.8mA
Connected to GND if not used.
2k
2k
2 6 11
INPUT (R) INPUT (G) INPUT (R)
2.5
2
Clamped to about 2.5V due to clamp pulses from pin 19. Input at low impedance.
2.5V 0.3mA CP
3 8 12
VCC1 (R) VCC1 (G) VCC1 (B)
12
-
Apply equivalent voltage to 3 channels.
Input pulses 4 9 13 OSD IN (R) OSD IN (G) OSD IN (B)
1k 3.7 to 5V 1.7V maximum
-
4 0.5mA 2.7V
Connected to GND if not used.
5 10 14 22 33
GND 1 (R) GND 1 (G) GND 1 (B) GND (5V) GND 2
GND
-
7
INPUT (S on G)
When open2.5V
500 1k
3.2V 7
SYNC ON GREEN input pin for sync separation. Sync is negative. input signal at Pin7, compare with the reference voltage of internal circuit in order to separate sync signal. When not used, set to OPEN.
18
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
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 20k
15
ABL IN
When open 2.5V
1.2k 1.2k
30k
ABL (Automatic Beam Limitter) input pin. Recommended voltage range is 0 to 5V. When ABL function is not used, set to 5V.
0.5mA 15
200
16
Uniformity IN
5.75
20k 7.25V 16
Uniformity input pin. Recommended amplitude range is 0 to 5VP-P.
5k
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
-
19 2.2V
0.5V maximum
Input at low impedance.
0.15mA
50k
20
SCL
-
20 2k 3V
SCL of I2C BUS (Serial clock line) VTH=2.3V
19
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
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
-
21 2k 3V
SDA of I2C BUS (Serial data line) VTH=2.3V
23 24 25 26
D/A OUT
-
23
D/A output pin. Output voltage range is 0 to 5V, Max output current is 0.4mA.
50k
R G
Input pulses
2.5 to 5V 0.5V maximum
27
Retrace BLK IN
-
B 27 2.25V
Connected to GND if not used.
35k
28 31 34
EXT Feed Back (B) EXT Feed Back (G) EXT Feed Back (R)
Variable
28
29 32 35
OUTPUT (B) OUTPUT (G) OUTPUT (R)
36
Variable
50
A resistor is needed on the GND side. Set discretionally to maximum 15mA, depending on the required driving capacity.
50 29
36
VCC2
12 Impressed
Used to supply power to output emitter follower only.
20
MITSUBISHI ICs (Monitor)
PRELIMINARY
Notice:This is not a final specification. Some parametric limits are subject to change.
M52742SP
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
CLAMP PULSE INPUT Clamp pulse width is recommended above 15kHz, 1.0sec above 30kHz, 0.5sec above 64kHz, 0.3sec. 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.
NOTICE OF APPLICATION Make the nearest distance between output pin and pull down resister. Recommended pedestal voltage of IC output signal is 2V.
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.
Power Amp Power Amp OUT Pre Amp INPUT R
MAIN BRIGHTNESS DC:1 to 5V
R OUT PUT Black level 1 to 5V
M52742SP
R Feed back Black level 1 to 5V R1 R2
EXT-FEED BACK APPLICATION CIRCUIT
21


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