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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 75Ω driver. Applications • TV peripheral devices Features • 1) Supports both NTSC and PAL. 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 75Ω 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.
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Multimedia ICs
BH7240AKV
•Absolute maximum ratings (Ta = 25°C)
Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol DVDD, AVCC1 AVCC2 Pd Topr Tstg Limits 7∗1 900∗2 – 20 ~ + 70 – 55 ~ + 125 Unit V mW °C °C
∗1 At Ta = 25°C ∗2 Reduced by 9.0mW for each increase in Ta of 1°C over 25°C.
(When mounted on a 70mm × 70mm × 1.6mm glass epoxy board.)
•Recommended operating conditions (Ta = 25°C)
Parameter Power supply voltage Symbol DVDD, AVCC1 AVCC2 Limits 4.50 ~ 5.50 Unit V
•Recommended input conditions (at DV
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
DD
= AVCC1 = AVCC2 = 5.0V)
Limits 2.2 ~ 5.0 GND ~ 0.8 2.2 ~ 5.0 GND ~ 0.8 Unit V V V V
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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 75Ω driver Analog red signal output. Internal 75Ω driver Analog green signal output. Internal 75Ω driver Analog blue output. Internal 75Ω driver Luminance signal output. Internal 75Ω driver Chrominance signal output. Internal 75Ω driver Composite video signal output. Internal 75Ω driver Power supply pin for 75Ω 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 2kΩ. 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
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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
Multimedia ICs
BH7240AKV
RGB DAC reference voltage output pin. A 0.1µF capacitor should be connected between the GND pins. This pin is not connected internally in the IC. GND pin for analog circuits (other than 75Ω driver) Analog red signal clamping pin Power .