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Multimedia ICs
Color TV signal encoder
BH7240AKV
The BH7240AKV is an IC that converts digital RGB signals (8-bit) to NTSC and PAL color TV signals. In addition to composite output, luminance output, chrominance output, and analog RGB output are available. Each type of output is equipped with an internal 75 driver.
*Applicationsdevices TV peripheral *Features both NTSC and PAL. 1) Supports
2) Internal RGB3-channel DAC (internal regulator). 3) Internal burst timing generator circuit. 4) Y / C separation output pin. 5) Analog RGB signal output pin. 3) Internal 75 driver.
*Block diagram
GDATA0 GDATA1 GDATA2 GDATA3 GDATA4 GDATA5 GDATA6 36 35 34 33 32 31 30 29 28 27 26 25 GDATA7 BDATA4 BDATA5 BDATA6 BDATA7
8 BDATA3 37 DECODER 8 BDATA2 38 CLK BDATA1 39 LATCH CLK LATCH CLK LATCH 22 RDATA2 DECODER DECODER 8 23 RDATA1 24 RDATA0
BDATA0
40
VREF
CELL MATRIX
CELL MATRIX
CELL MATRIX VCC
21
RDATA3
VCLK
41
CLK CLAMP CLAMP CLAMP
20
DVDD
DGND
42
GND
19
RDATA4
VREFOUT
43 MATRIX
Burst Flag GEN. B-Y
18 SYNC 17
RDATA5
N.C.
44 R G B SYNC
R-Y
RDATA6
AGND1
45
GND
Y SYNC ADD.
CHROMA GEN. 16 LPF YTRAP 15 Y/C MIX SCIN RDATA7
RCLAMP
46
VCC1
47
VCC
6dB
6dB
6dB
6dB
BPF
SYNC
14
SYNCIN
GCLAMP
48 GND
75
75
75
75
75
75
13 VCC
NT / PAL
1 BCLAMP
2 GND2
3 ROUT
4 GOUT
5 BOUT
6 YOUT
7 COUT
8 VOUT
9 VCC2
10 YTRAP
11 N.C.
12 N.C.
1
Multimedia ICs
BH7240AKV
*Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol DVDD, AVCC1 AVCC2 Pd Topr Tstg Limits 71 9002 - 20 ~ + 70 - 55 ~ + 125 Unit V mW C C
1 At Ta = 25C 2 Reduced by 9.0mW for each increase in Ta of 1C over 25C.
(When mounted on a 70mm x 70mm x 1.6mm glass epoxy board.)
*Recommended operating conditions (Ta = 25C)
Parameter Power supply voltage Symbol DVDD, AVCC1 AVCC2 Limits 4.50 ~ 5.50 Unit V
*Recommended input conditions (at DVDD = AVCC1 = AVCC2 = 5.0V)
Parameter VCLK, RGBDATA input high level VCLK, RGBDATA input low level SYNCIN, NT / PAL input high level SYNCIN, NT / PAL input low level Symbol VTH VTL VTH VTL Limits 2.2 ~ 5.0 GND ~ 0.8 2.2 ~ 5.0 GND ~ 0.8 Unit V V V V
2
Multimedia ICs
BH7240AKV
*Pin descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 Pin name BCLAMP AGND2 ROUT GOUT BOUT YOUT COUT VOUT AVCC2 YTRAP N.C. N.C. NT / PAL SYNCIN SCIN RDATA7 RDATA6 RDATA5 RDATA4 DVDD RDATA3 RDATA2 RDATA1 RDATA0 GDATA7 GDATA6 GDATA5 GDATA4 GDATA3 GDATA2 GDATA1 GDATA0 BDATA7 BDATA6 BDATA5 BDATA4 BDATA3 BDATA2 BDATA1 Analog blue signal clamping pin GND pin for 75 driver Analog red signal output. Internal 75 driver Analog green signal output. Internal 75 driver Analog blue output. Internal 75 driver Luminance signal output. Internal 75 driver Chrominance signal output. Internal 75 driver Composite video signal output. Internal 75 driver Power supply pin for 75 driver Luminance trap filter connection pin. Connecting a trap filter eliminates the chrominance band component included in the luminance signal, and reduces the amount of chrominance color. Output impedance is approximately 2k. This is effective only for composite video output. This pin is not connected within the IC. This pin is not connected within the IC. Video output method selector pin. NTSC when HIGH, PAL when LOW Composite SYNC input. For LOW input, SYNC is output to YOUT and VOUT. At the same time, DC clamping of the RGB signal takes place. Color subcarrier input. Sine waves of a frequency corresponding to the required output method, or pulse waves with a duty of 50%, should be input in a range not exceeding VCC-GND. Red data input pin (bit 7) Red data input pin (bit 6) Red data input pin (bit 5) Red data input pin (bit 4) Power supply pin for digital circuit Red data input pin (bit 3) Red data input pin (bit 2) Red data input pin (bit 1) Red data input pin (bit 0) Green data input pin (bit 7) Green data input pin (bit 6) Green data input pin (bit 5) Green data input pin (bit 4) Green data input pin (bit 3) Green data input pin (bit 2) Green data input pin (bit 1) Green data input pin (bit 0) Blue data input pin (bit 7) Blue data input pin (bit 6) Blue data input pin (bit 5) Blue data input pin (bit 4) Blue data input pin (bit 3) Blue data input pin (bit 2) Blue data input pin (bit 1) Function
3
Multimedia ICs
Pin No. 40 41 42 43 44 45 46 47 48 Pin name BDATA0 VCLK DGND VREFOUT N.C. AGND1 RCLAMP VCC1 GCLAMP Blue data input pin (bit 0) System clock input. RGB data is taken into the IC at the timing of this clock. GND pin for digital circuit Function
BH7240AKV
RGB DAC reference voltage output pin. A 0.1F capacitor should be connected between the GND pins. This pin is not connected internally in the IC. GND pin for analog circuits (other than 75 driver) Analog red signal clamping pin Power supply pin for analog circuits (other than 75 driver) Analog green signal clamping pin
4
Multimedia ICs
BH7240AKV
*Pin equivalent circuits
Pin No. Pin name Equivalent circuit 1 46 48 BCLAMP RCLAMP GCLAMP
30
10
YTRAP
30
2k
50k (13pin) 100k (14pin)
13 14
NT / RAL SYNCIN
1k 25k
15
SCIN
1k
20k
5
Multimedia ICs
Pin No. Pin name Equivalent circuit
BH7240AKV
3.2k
43
VREFOUT
30
4.8k
3 4 5 6 7 8
ROUT GOUT BOUT YOUT COUT VOUT
16 ~ 19 21 ~ 24 25 ~ 32 33 ~ 40 41
RDATA7 ~ 4 RDATA3 ~ 0 GDATA7 ~ 0 BDATA7 ~ 0 VCLK
50 5k
6
Multimedia ICs
BH7240AKV
*Electrical characteristics (unless otherwise noted, Ta = 25C, DVDD = AVCC1 = AVCC2 = 5.0V)
Parameter Current consumption Luminance level (VOUT, YOUT) White level Red level Green level Blue level Sync level Sync / white level ratio VLWHITE VLRED VLGREEN VLBLUE VLSYNC RS / W 0.59 0.18 0.35 0.07 0.27 0.37 0.70 0.21 0.41 0.08 0.30 0.43 0.81 0.24 0.47 0.09 0.33 0.49 VP- P VP- P VP- P VP- P VP- P
--
Symbol ICC
Min.
--
Typ. 85
Max. 105
Unit mA
Conditions RGBDATA = 00 input
RGBDATA = FF input RDATA = FF input GDATA = FF input BDATA = FF input
-- --
Chrominance level (VOUT, COUT) Red / Burst level ratio Green / Burst level ratio Blue / Burst level ratio Burst level Red phase Green phase Blue phase RGB level (ROUT, GOUT, BOUT) ROUT output level GOUT output level BOUT output level Other RGB DATA conversion frequency RGB DATA setup time RGB DATA hold time SYNCIN, NT / PAL input high level current SYNCIN, NT / PAL output low level current fDA TSET THOLD IH IL
-- -- -- -- -- --
RR / BU RG / BU RB / BU VCBURST RED GREEN BLUE
2.69 2.51 1.91 0.25 94 231 337
3.16 2.95 2.24 0.29 104 241 347
3.63 3.39 2.57 0.33 114 251 357
-- -- --
RDATA = FF input GDATA = FF input BDATA = FF input
--
VP- P deg deg deg
RDATA = FF input GDATA = FF input BDATA = FF input
VROUT VGOUT VBOUT
0.56 0.59 0.59
0.70 0.70 0.70
0.81 0.81 0.81
VP- P VP- P VP- P
RDATA = FF input GDATA = FF input BDATA = FF input
20
-- --
MHz ns ns A A
-- -- --
20 20
-- --
300 200
When 5V is applied to pin When 0V is applied to pin
7
Multimedia ICs
BH7240AKV
*Measurement circuit
8bit Digital blue signal
8bit Digital green signal
36
35
34
33
32
31
30
29
28
27
26
25
37 38 39 40 Clock 41 42
24 23 22 21 20 19 VCC
8bit Digital blue signal
8bit Digital red signal
BH7240AKV
43 0.1F 44 45 46 0.1F VCC 47 48 0.1F 1 2 75 + 220 3 75 + 4 75 + 5 75 + 6 75 + 220 VOUT 7 75 + VCC 0.8V 2.2V 8 9 10 11 12 14 13 0.8V 2.2V Composite SYNC 17 16 15 18 8bit Digital red signal
Color sub carrier
220 220 GOUT
220 0.047 YOUT
ROUT
BOUT
COUT
8
Multimedia ICs
operation *CircuitDAC system clock is input to the VCLK pin. (1) The RGB data is taken into the IC at the rising edge of this clock.
RGBDATA
BH7240AKV
0
1
2
3
4
5
VCLK
Internal RGB
0
1
2
3
4
5
(2) The subcarrier is input to the SCIN pin. There is an internal input capacitor in the IC, so no external DC cutoff is necessary. Also, the input level supports a range of 0.5 to 5Vp-p. To avoid offset in the chrominance phase, distortion-free sine waves or pulses with a duty of 50% should be input in a range which does not exceed the VCC and GND. (3) Composite SYNC signals are input to SYNCIN. When the input level is low, SYNC signals are output to the composite output (VOUT) and luminance output (YOUT), and DC clamping of the RGB signals from the DAC is carried out at this timing. To prevent erroneous clamping, RGB data should be set to 00 input during the SYNC interval. (4) Burst timing and the chrominance phase reversal timing when PAL is used are generated by SYNC signals and subcarriers. For this reason, signals input as SYNC signals and subcarriers should be in conformance with standards.
(5) The NT / PAL pin is used to select the video output system. When the input level is high, NTSC is selected, and when the input level is low, PAL is selected. When PAL is selected, the chrominance phase is reversed once every hour. (6) A trap filter is connected to the YTRAP pin. This eliminates the chrominance band component that includes the luminance signal, and reduces crosscolor. This filter is effective only for composite output (VOUT), and does not affect luminance output (YOUT). (7) Composite signals are output from the VOUT pin. An internal 75 driver enables direct drive of the 75 load. (However, DC cutoff is required.) (8) Luminance signals and chrominance signals are output from the YOUT and COUT pins, respectively. An internal 75 driver enables direct drive of the 75 load. (However, DC cutoff is required.) (9) Analog RGB signals are output from ROUT, GOUT, and BOUT. An internal 75 driver enables direct drive of the 75 load. (However, DC cutoff is required.)
*External dimensions (Units: mm)
9.0 0.3 7.0 0.2 36 9.0 0.3 7.0 0.2 37 48 1 1.425 0.1 0.10 25 24 13 12 0.5 0.125 0.1 0.10
0.5
0.2 0.1
VQFP48
9

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