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发表于 2007-11-8 14:20:19
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<DIV class=quote><B>以下是引用<I>ＹＣＢＴ</I>在2007-11-8 14:18:16的发言：</B>
求视频ＤＡＣTO P/N制.输出有RGB三路和CVBS信号
求 bh7240akv代换IC有哪些啊,[52RD.com]
BH7240akv代换IC有哪些啊,[52RD.com][52RD.com]
此IC为一视频DA到P/N制的IC最高工作温度为70度,我想找个工作温度能达85度的,不知道还有其它厂家有此功能IC.[52RD[52RD.com]
附件有DATASHEET.[52RD.com]
【文件名】:07118@52RD_H7240AVK.pdf[52RD.com]
【格 式】:pdf[52RD.com]
【大 小】:95K[52RD.com]
【简 介】:[52RD.com]
【目 录】:[52RD.com]
[52RD.com]
点击浏览该文件</DIV>
1
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 75W driver.
•Applications
TV peripheral devices
•Block diagram
36 35 34 33 32 31 30 29 28 27 26 25
1 2 3 4 5 6 7 8 9 10 11 12
24
23
22
21
20
19
18
17
16
15
14
13
RDATA0
RDATA1
RDATA2
RDATA3
DVDD
RDATA4
RDATA5
RDATA6
RDATA7
SCIN
SYNCIN
NT / PAL
37
38
39
40
41
42
43
44
45
46
47
48
BDATA3
BDATA2
BDATA1
BDATA0
VCLK
DGND
VREFOUT
N.C.
AGND1
RCLAMP
VCC1
GCLAMP
BCLAMP
GND2
ROUT
GOUT
BOUT
YOUT
COUT
VOUT
VCC2
YTRAP
N.C.
N.C.
BDATA4
BDATA5
BDATA6
BDATA7
GDATA0
GDATA1
GDATA2
GDATA3
GDATA4
GDATA5
GDATA6
GDATA7
DECODER
LATCH
CLAMP CLAMP
MATRIX
LPF
6dB 6dB 6dB 6dB BPF
75
GND VCC
VCC
GND
GND
CLK
75 75 75 75 75
YTRAP
Y / C
MIX
Burst
Flag
GEN.
CLAMP
VREF
CELL
MATRIX
CELL
MATRIX
CELL
MATRIX
DECODER DECODER
CLK CLK LATCH CLK LATCH
SYNC
CHROMA
GEN.
SYNC
ADD.
VCC
SYNC
8
8
8
R-Y B-Y
Y
R
G
B
SYNC
•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 75W driver.
2
Multimedia ICs BH7240AKV
•Absolute maximum ratings (Ta = 25°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.)
Parameter Symbol Limits Unit
Power supply voltage 7*1 V
Power dissipation 900*2 mW
Operating temperature Topr – 20 ~ + 70 °C
Storage temperature Tstg – 55 ~ + 125 °C
Pd
DVDD, AVCC1
AVCC2
•Recommended operating conditions (Ta = 25°C)
Parameter Symbol Limits
4.50 ~ 5.50
Unit
Power supply voltage DVDD, AVCC1 V
AVCC2
•Recommended input conditions (at DVDD = AVCC1 = AVCC2 = 5.0V)
Parameter Symbol
VTH
VTL
VTH
VTL
Limits Unit
VCLK, RGBDATA
input high level
VCLK, RGBDATA
input low level
SYNCIN, NT / PAL
input high level
SYNCIN, NT / PAL
input low level
2.2 ~ 5.0
GND ~ 0.8
2.2 ~ 5.0
GND ~ 0.8
V
V
V
V
3
Multimedia ICs BH7240AKV
•Pin descriptions
Pin No.
1
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
21
22
23
24
10
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 75W driver
Analog red signal output. Internal 75W driver
Analog green signal output. Internal 75W driver
Analog blue output. Internal 75W driver
Luminance signal output. Internal 75W driver
Chrominance signal output. Internal 75W driver
Composite video signal output. Internal 75W driver
Power supply pin for 75W driver
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
Function
Red data input pin (bit 7)
Red data input pin (bit 6)
Red data input pin (bit 5)
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)
Red data input pin (bit 4)
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)
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 2kW. This is effective only for composite video
output.
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.
4
Multimedia ICs BH7240AKV
Blue data input pin (bit 0)
GND pin for digital circuit
This pin is not connected internally in the IC.
GND pin for analog circuits (other than 75W driver)
Analog red signal clamping pin
Power supply pin for analog circuits (other than 75W driver)
Analog green signal clamping pin
System clock input.
RGB data is taken into the IC at the timing of this clock.
RGB DAC reference voltage output pin. A 0.1mF capacitor should be connected
between the GND pins.
Pin No.
40
41
42
43
44
45
46
47
48
Pin name Function
BDATA0
VCLK
DGND
VREFOUT
N.C.
AGND1
RCLAMP
VCC1
GCLAMP
5
Multimedia ICs BH7240AKV
•Pin equivalent circuits
1k 20k
50k (13pin)
100k (14pin)
1k 25k
30 2k
30
Pin No.
1
46
48
Pin name Equivalent circuit
BCLAMP
RCLAMP
GCLAMP
YTRAP
NT / RAL
SYNCIN
10
15 SCIN
13
14
6
Multimedia ICs BH7240AKV
30
3.2k
4.8k
50 5k
Pin No. Pin name Equivalent circuit
RDATA7 ~ 4
RDATA3 ~ 0
GDATA7 ~ 0
BDATA7 ~ 0
VCLK
ROUT
GOUT
BOUT
YOUT
COUT
VOUT
16 ~ 19
21 ~ 24
25 ~ 32
33 ~ 40
41
43 VREFOUT
3
4
5
6
7
8
7
Multimedia ICs BH7240AKV
•Electrical characteristics (unless otherwise noted, Ta = 25°C, DVDD = AVCC1 = AVCC2 = 5.0V)
Current consumption
áLuminance levelñ (VOUT, YOUT)
White level
Red level
Green level
Blue level
Sync level
Sync / white level ratio
áChrominance levelñ (VOUT, COUT)
Red / Burst level ratio
Green / Burst level ratio
Blue / Burst level ratio
Burst level
Red phase
Green phase
Blue phase
áRGB levelñ (ROUT, GOUT, BOUT)
ROUT output level
GOUT output level
BOUT output level
áOtherñ
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
Parameter Symbol Min. Typ. Max. Unit Conditions
ICC — 85 105 mA RGBDATA = 00 input
RGBDATA = FF input
RDATA = FF input
GDATA = FF input
BDATA = FF input
RDATA = FF input
GDATA = FF input
BDATA = FF input
RDATA = FF input
GDATA = FF input
BDATA = FF input
RDATA = FF input
GDATA = FF input
BDATA = FF input
When 5V is applied to pin
When 0V is applied to pin
VLWHITE 0.59 0.70 0.81 VP- P
VLRED 0.18 0.21 0.24 VP- P
VLGREEN 0.35 0.41 0.47 VP- P
VLBLUE 0.07 0.08 0.09 VP- P
VLSYNC 0.27 0.30 0.33 VP- P
— —
—
—
—
—
—
RS / W 0.37 0.43 0.49
RR / BU 2.69 3.16 3.63
RG / BU 2.51 2.95 3.39
RB / BU 1.91 2.24 2.57
VCBURST 0.25 0.29 0.33 VP- P
qRED 94 104 114 deg
qGREEN 231 241 251 deg
qBLUE 337 347 357 deg
VROUT 0.56 0.70 0.81 VP- P
VGOUT 0.59 0.70 0.81 VP- P
VBOUT 0.59 0.70 0.81 VP- P
THOLD
IH
IL
20
—
—
—
—
—
fDA — — 20 MHz —
TSET 20 — — ns —
— ns —
300 mA
200 mA
8
Multimedia ICs BH7240AKV
•Measurement circuit
36 35 34 33 32 31 30 29 28 27 26 25
1 2 3 4 5 6 7 8 9 10 11 12
24
23
22
21
20
19
18
17
16
15
14
13
37
38
39
40
41
42
43
44
45
46
47
48
BH7240AKV
VCC
VCC
Clock
8bit Digital
blue signal
8bit Digital
blue signal
8bit Digital
green signal
8bit Digital
red signal
8bit Digital
red signal
VCC
Color sub carrier
Composite SYNC
75
+
220m
0.1mF
ROUT
75
220m
GOUT
75
220m
BOUT
75
220m
YOUT
75
0.047m
COUT
75
220m
VOUT
0.8V 2.2V
0.8V 2.2V
0.1mF
0.1mF
+ + + + +
9
Multimedia ICs BH7240AKV
•Circuit operation
(1) The DAC system clock is input to the VCLK pin.
RGB data is taken into the IC at the rising edge of this
clock.
RGBDATA 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 75W driver enables direct drive of the 75W
load. (However, DC cutoff is required.)
(8) Luminance signals and chrominance signals are
output from the YOUT and COUT pins, respectively. An
internal 75W driver enables direct drive of the 75W
load. (However, DC cutoff is required.)
(9) Analog RGB signals are output from ROUT, GOUT,
and BOUT. An internal 75W driver enables direct drive of
the 75W load. (However, DC cutoff is required.)
•External dimensions (Units: mm)
VQFP48
0.5
0.125 ± 0.1
0.10
0.2 ± 0.1
9.0 ± 0.3
7.0 ± 0.2
9.0 ± 0.3
7.0 ± 0.2
48
37
1 12
13
24
36 25
0.5
1.425 ± 0.1
0.10 |
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发表于 2007-11-8 14:18:16
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