SPCA701A 概述
DIGITAL VIDEO ENCODER FOR VIDEOCD 数字视频编码器,影像光盘
SPCA701A 数据手册
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PDF下载Preliminary
SPCA701A
DIGITAL VIDEO ENCODER FOR VIDEOCD
GENERAL DESCRIPTION
The SPCA701A is designed specifically for VideoCD, video games and other digital video systems, which require
the conversion of digital YCrCb (MPEG) data to analog NTSC/PAL video. The device supports a glue-less
interface to most popular MPEG decoders. The SPCA701A supports worldwide video standards, including
NTSC (N America, Japan) PAL-B, D, G, H, I (Europe, Asia). Furthermore, the SPCA701A operates with a
single 2x clock and can be powered with a single 3.3V supply. The composite analog video signal is output
simultaneously onto two outputs. Therefore, it allows one output to provide base-band composite video while
the other drives a RF modulator. Alternatively, analog luminance (Y) and chrominance (C) information is
available for interfacing to S-video equipment. As a slave, the SPCA701A automatically detects the input data
formats (PAL/NTSC, CCIR601) and switches internally to provide the proper format on the outputs. This feature,
along with the on-board voltage reference and single clock interface, makes the SPCA701A extremely simple to
use. In addition, use of 2x over-sampling on-chip simplifies external filter design resulting in reduced overall
system cost.
FEATURES
BLOCK DIAGRAM
ꢀ 8-bit 4:2:2 YCrCb inputs for glue-less interface to
MPEG decoders
VBIAS VREFOUT
FSADJUST
ꢀ NTSC/PAL composite video outputs (North
American NTSC and Western European PAL)
ꢀ CVBS or S-video outputs
CLK
Internal
VREF
COMP
VRDAC
9
P[7:0]
DAC
DAC
CVBS/Y
CVBS/C
ꢀ 3.3 V supply voltage
Mod.
and
Mixer
2 x
Upsample
HSYNC*
Latch
ꢀ 5 V tolerant for all digital I/O data pins
ꢀ CCIR 601 operation
9
1.3MHz
LPF
VSYNC*
ꢀ 2x over sampling simplifies external filtering
ꢀ 9-bit DACs
MODE[3:0]
MASTER
CBSWAP
SVIDEO
SLEEP
ꢀ Master or slave video timing
ꢀ Interlaced operation
APPLICATIONS
ꢀ Automatic mode detection/switching in slave mode
ꢀ On-board voltage reference
ꢀ 32-pin PLCC package
ꢀ VideoCD
ꢀ Karaoke/video games
ꢀ Digital Video Disk (DVD)
ꢀ Digital VCR
ꢀ Digital set top box
ꢀ Sunplus Technology Co., Ltd.
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Rev.: 0.2 1999.12.07
Preliminary
SPCA701A
PIN DESCRIPTION (Table 1.)
Mnemonic
PIN No.
Type
Description
DATA[7:0]
21-28
I
YCrCb pixel inputs. They are latched on the rising edge of CLK. YCrCb
input data conform to CCIR 601.
CLK
29
32
I
Pixel clock input.
VSYNC
I/O
Vertical sync input/output. VSYNC is latched/output following the rising
edge of CLK.
HSYNC
MASTER
CBSWAP
SVIDEO
SLEEP
1
I/O
Horizontal sync input/output. HSYNC is latched/output following the
rising edge of CLK.
16
15
14
13
I
I
I
I
Master/slave mode selection. A logical high for master mode operation.
A logical 0 for slave mode operation
Cr and Cb pixel sequence configuration pin. A logic high swap the Cr
and Cb sequence.
SVIDEO select input pin. A logic high selects Y/C output. A logic low
selects composite video output.
Power save mode. A logic high on this pin puts the chip into power-
down mode.
Mode[3:2]
Mode[1:0]
TEST
17-18
19-20
2
I
I
I
I
Mode configuration pin.
Useless pins. It will be better to connect them to VDD or DGND.
Test pin. These pins must be connected to DGND.
Voltage reference input. An external voltage reference must supply
typical 1.235V to this pin. A 0.1ꢁF ceramic capacitor must be used to
de-couple this input to GND. The decoupling capacitor must be as
closed as possible to minimize the length of the load. This pin may be
connected directly to VREFOUT.
VREFIN
9
VREFOUT
FSADJ
8
5
O
-
Voltage reference output. It generates typical 1.2V voltage reference
and may be used to drive VREFIN pin directly.
Full-Scale adjust control pin. The Full-Scale current of D/A converters
can be adjusted by connecting a resistor (RSET) between this pin and
ground.
COMP
6
4
-
Compensation pin. A 0.1ꢁF ceramic capacitor must be used to bypass
this pin to VAA. The lead length must be kept as short as possible to
avoid noise.
CVBSY
O
Composite/Luminance output. This is a high-impedance current source
output. The output format can be selected by the PAL pin. The
CVBSY can drive a 37.5 ꢂ load. If unused, this pin must be connected
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Preliminary
SPCA701A
Mnemonic
PIN No.
Type
Description
directly to GND.
CVBSC
11
O
Composite/Chroma output. This is a high impedance current source
Output. The output format can be selected by the PAL pin. The pin
can drive a 37.5 ꢂ load. If unused, this pin must be connected directly
to GND.
VBIAS
VDD
10
31
-
-
-
-
-
DAC bias voltage. Potential normally 0.7V less than COMP.
Digital power pin
Digital ground pin
Analog power pin
Analog ground pin
DGND
VAA
30
7
AGND
3,12
MODE SELECTION
Master mode is selected when MASTER = 1; slave mode is selected when MASTER = 0. Two pins, MODE
[3:2], drive three different configuration registers. The most common operating modes can be selected with
these pins while in master mode. In slave mode, the common operating modes are automatically determined
from the timing of the incoming HSYNC* and VSYNC* signals.
NOTE: The term “common operating mode” refers to North American NTSC and Western European PAL Table
2 illustrates the multi-functionality of the mode pins during master and slave mode. To access the more
exotic video formats, slave mode is preferred since the necessary registers are always accessible. If
master mode is needed, the less common modes can still be programmed by first registering the modes
as a slave, and then switching to a master. During power-up, the MODE [3:2] pins configure the master
registers; i.e., EFIELD, PAL625, are written. Also, during power-up, the slave registers are reset to zero,
i.e., YCSWAP.
Table 2. Mode Selection
PIN Description
The MASTER pin
MODE[3]
YCSWAP
EFIELD
MODE[2]
---
MODE[1]
MODE[0]
0
1
---
---
---
---
PAL625
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Preliminary
SPCA701A
Table 3. Configuration Register Settings
Mode Register
set to 0
Set to 1
Comments
Name
EFIELD
The VSYNC pin will output
The VSYNC pin will output field
signal. Low at VSYNC pin for
even field, high for odd field
The 625-line operation will be
select
This is only used at
master mode.
normal vertical
synchronization signal.
525-line operation will be
select
PAL625
This is only used at
master mode
----
YCSWAP
Do not swap Y and Cr/Cb
Swap Y and Cr/Cb sequence
ꢀ
CLOCK TIMING
A clock signal with a frequency twice the luminance sampling rate must be present at the CLK pin. All setup and
hold timing specifications are measured with respect to the rising edge of this signal.
PIXEL INPUT TIMING
ꢀ PIXEL SEQUENCE
Multiplexed Y, Cb, and Cr data is input through the DATA[7:0] inputs. By default, the input sequence for active
video pixels must be Cb0, Y0, Cr0, Y1, Cb2, Y2, Cr2, Y3, etc., in accordance with CCIR-656. This pattern
begins during the first CLK period after the falling edge of HSYNC* (regardless of the setting of SLAVE/MASTER
mode). The order of Cb and Cr can be reversed by setting the CBSWAP pin. Figure 1 illustrates the timing.
If the pixel stream input to the SPCA701A is off by one CLK period, the SPCA701A can lock to the pixel stream
by setting the YCSWAP register. This would solve the problem of having the Y and Cr/Cb pixels swapped.
Figure 1. Pix Sequence
CBSWAP(1)
CLK(2)
HSYNC*(3)
0
1
P[7:0]
P[7:0]
Cbn
Crn
Yn
Yn
Crn
Yn + 1
Yn + 1
Cbn+2
Crn+2
Cbn
Notes: (1). CBSWAP is pin 11.
(2). Pixel transitions must occur observing setup and hold timing about the rising edge of CLK.
(3). Pixel sequence will beging with Cbn at 4 x m clock periods following the falling edge of HSYNC*, when m
is an integer.
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Preliminary
SPCA701A
VIDEO TIMING
The width of the analog horizontal sync pulses and the start and end of color burst is automatically calculated and
inserted for each mode according to CCIR-624-4. Color burst is disabled on appropriate scan lines.
Serration and equalization pulses are generated on appropriate scan lines. In addition, rise and fall times of
sync, and the burst envelope are internally controlled. Video timing figures follow the text in this section.
ꢀ SYNC AND BURST TIMING
Table 4 lists the resolutions and clock rates for the various modes of operation.
Table 5 lists the horizontal counter values for the end of horizontal sync, start of color burst, end of color burst,
front porch, back porch, and the first active pixel for the various modes of operation. The front porch is the
interval before the next expected falling HSYNC* when outputs are automatically blanked. The horizontal sync
width is measured between the 50% points of the falling and rising edges of horizontal sync. The start of color
burst is measured between the 50% point of the falling edge of horizontal sync and the first 50% point of the color
burst amplitude (nominally +20 IRE for NTSC and 150 mV for PAL-B, D, G, H, I above the blanking level). The
end of color burst is measured between the 50% point of the falling edge of horizontal sync and the last 50% point
of the color burst envelope (nominally +20 IRE for NTSC and 150 mV for PAL-B, D, G, H, I above the blanking
level).
Table 4. Field Resolutions and Clock Rates for Various Modes of Operation
Operating Mode
NTSC CCIR601
PAL-B,D,G,H,I
Active pixels
720 x 240
Total Pixels
858 x 262
864 x 313
CLK Frequency (MHz)
27
27
720 x 288
Table 5. Horizontal Counter Values for Various Video Timings
Front porch
(a)
Horizontal
Start of
Duration of
Back
Operation Mode
Sync Width (b)
Burst (c)
Burst (d)
porch (e)
NTSC CCIR601
PAL-B CCIR601
20
20
63
63
72
76
34
30
127
142
Notes: (1) The unit is the number of luminance pixel.
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Preliminary
SPCA701A
ꢀ MASTER MODE
Horizontal sync (HSYNC*) and vertical sync (VSYNC*) are generated from internal timing and optional software
bits. HSYNC*, and VSYNC* are output following the rising edge of CLK. The horizontal counter is
incremented on every other rising edge of CLK. After reaching the appropriate value (determined by the mode
of operation), it is reset to one, indicating the start of a new line. The vertical counter is incremented at the start
of each new line. After reaching the appropriate value, determined by the mode of operation, it is reset to one,
indicating the start of a new field. VSYNC* is asserted for 3 or 2.5 scan lines for 262/525 line and 312/625 line,
respectively.
ꢀ SLAVE MODE
Horizontal sync (HSYNC*) and vertical sync (VSYNC*) are inputs that are registered on the rising edge of
CLOCK. The horizontal counter is incremented on the rising edge of CLOCK. Two clock cycles after falling
edge of HSYNC*, the counter is reset to one, indicating the start of a new line. The vertical counter is
incremented on the falling edge of HSYNC*. A falling edge of VSYNC* resets it to one, indicating the start of a
new field. A falling edge of VSYNC* occurring within ±1/4 of a scan line from the falling edge of HSYNC* cycle
time (line time) indicates the beginning of Field 1. A falling edge of VSYNC* occurring within ±1/4 scan line from
the mid-point of the line indicates the beginning of Field 2.
The operating mode (NTSC/PAL) can be programmed with the MODE[3:2] bits when the SETMODE (MASTER
pin) bit is set high. Alternatively, when SETMODE is low, the mode is automatically detected in slave mode.
For example, 525-line operation is assumed, 625-line operation is detected by the number of HSYNC* edges
between VSYNC* edges. The frequency of operation (CCIR-601) for both PAL and NTSC is detected by
counting the number of clocks per line. The pixel rate is assumed to be 13.5 MHz, ±1 count which is detected in
between two successive falling edges of HSYNC*.
ꢀ BURST BLANKING
For NTSC, color burst information is automatically disabled on scan lines 1-9 and 264-272, inclusive. (SMPTE
line numbering convention.) For PAL-B, D, G, H, I color burst information is automatically disabled on scan lines
1-6, 310-318, and 623-625, inclusive, for fields 1, 2, 5, and 6. During fields 3, 4, 7, and 8, color burst information
is disabled on scan lines 1-5, 311-319, and 622-625, inclusive.
ꢀ Sunplus Technology Co., Ltd.
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Preliminary
SPCA701A
VERTICAL BLANKING INTERVALS
For NTSC, scan lines 1-9 and 263-272, inclusive, are always blanked. There is no setup on scan lines 10-21
and 273-284 inclusive. All displayed lines in the vertical blanking interval (10-21 and 273-284 for interlaced
NTSC; 7-13 and 320-335 for interlaced PAL-B, D, G, H, I) are forced to blank. For PAL-B, D, G, H, I, scan lines
1-6, 311-318, and 624-625, inclusive, during fields 1, 2, 5, and 6, are always blanked. During fields 3, 4, 7, and
8, scan lines 1-5, 311-319, and 624-625, inclusive, are always blanked.
ꢀ DIGITAL PROCESSING
Once the input data is converted into internal YUV format, the UV components are low-pass filtered with a filter.
The Y and filtered UV components are up-sampled to CLK frequency by a digital filter.
ꢀ SUBCARRIER GENERATION
To maintain a synchronous sub-carrier relative to HSYNC*, the sub-carrier phase is reset every frame for NTSC
and every 8 fields for PAL. The SCA phase is non-zero and depends upon the clock frequency and the video
format.
For a perfect clock input, the burst frequency is 4.43361875 MHz for PAL-B, D,
G, H, I, 3.579545 MHz for NTSC interlaced.
ꢀ POWER-DOWN MODE
In power-down mode (SLEEP pin set to 1), the internal clock is stopped and also an internal reset is forced and
the DACs are powered down. When returned high, the device starts from a reset state (horizontal and vertical
counters = 0, which is the start of VSYNC in Field 1). This mode should be set when the SPCA701A may be
subjected to clock frequencies outside its functional range. If Master = 1, the HSYNC* and VSYNC* pins remain
driven to the value previously output before SLEEP was activated and power down current is dependent on
loading on the HSYNC* and VSYNC* pins.
ꢀ Sunplus Technology Co., Ltd.
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Preliminary
SPCA701A
Figure 2. Interlaced 525-Line (NTSC) Video Timing
Start
of
YSYNC
Analog
Field 1
523
524
525
1
2
3
4
5
6
7
8
9
10
22
Burst Phase
Analog
Field 2
261
262
263
264
265
266
267
268
269
270
271
272
285
Analog
Field 3
525
2
4
22
523
524
1
3
5
6
7
8
9
10
Burst Phase
Analog
Field 4
261
262
263
264
265
266
267
268
269
270
271
272
285
Burst Begins with Positive Half-Cycle
Burst Phase = Reference Phase = 180 0 Relative to B-Y
Burst Begins with Negative Half-Cycle
Burst Phase = Reference Phase = 180 0 Relative to B-Y
Note: SMPTE line numbering convention rather than CCIR-624 is used.
ꢀ Sunplus Technology Co., Ltd.
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Rev.: 0.2 1999.12.07
Preliminary
SPCA701A
Figure 3a. Interlaced 625-Line (PAL) Video Timing
Start
of
VSYNC
Analog
Field 1
620
621
622
623
624
625
1
2
3
4
5
6
7
22
23
24
-U Phase
Analog
Field 2
308
309
310
311
312
313
314
315
316
317
318
319
320
336
337
Analog
Field 3
23
620
621
622
623
624
625
1
2
3
4
5
6
7
22
24
Analog
Field 4
308
309
310
311
312
313
314
315
316
317
318
319
320
336
337
Field One
Field Two
Burst
Blanking
Intervals
Field Three
Field Four
Burst Phase = Reference Phase = 135 0 Relative to U
PAL Switch = 0, + V Component
Burst Phase = Reference Phase + 90 0 = 2250 Relative to U
PAL Switch = 1, -V Component
ꢀ Sunplus Technology Co., Ltd.
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Rev.: 0.2 1999.12.07
Preliminary
SPCA701A
Figure 3b. Interlaced 625-Line (PA L) Video Timing
Start
of
VSYNC
Analog
Field 5
620
621
622
623
624
625
1
2
3
4
5
6
7
22
23
24
-U Phase
Analog
Field 6
308
309
310
311
312
313
314
315
316
317
318
319
320
336
337
Analog
Field 7
620
621
622
623
624
625
1
2
3
4
5
6
7
22
23
24
Analog
Field 8
308
309
310
311
312
313
314
315
316
317
318
319
320
336
337
Field Five
Field Six
Burst
Blanking
Intervals
Field Seven
Field Eight
Burst Phase = Reference Phase = 135 0 Relative to U
PAL Switch = 0, + V Component
Burst Phase = Reference Phase + 90 0 = 2250 Relative to U
PAL Switch = 1, -V Component
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Preliminary
SPCA701A
PIXEL INPUT RANGES AND COLORSPACE CONVERSION
ꢀ YC INPUTS (4:2:2 YCRCB)
Y has a nominal range of 16-235; Cb and Cr have a nominal range of 16-240, with 128 equal to zero. Values of
0 and 255 are interpreted as 1 and 254 respectively. Y values of 1-15 and 236-254, and CrCb values of 1-15
and 241-254, are interpreted as valid linear values. NTSC mode with setup disabled has 2% less black-to-white
range than NTSC mode with setup enabled.
ꢀ DAC CODING
White is represented by a DAC code of 400. For PAL-B, D, G, H, I, the standard blanking level is represented
by a DAC code of 120. For NTSC, the standard blanking level is represented by a DAC code of 114, 1 IRE is
equivalent to a DAC code of 2.857.
OUTPUTS
All digital-to-analog converters are designed to drive standard video levels into an equivalent 37.5 ꢂ load.
Unused outputs should be connected directly to ground to minimize supply switching currents. Either two
composite video outputs or Y/C S-Video outputs are available (selectable by the SVIDEO pin). If the SLEEP pin
is high, the DACs are essentially turned off and only the leakage current is present.
ꢀ COMPOSITE AND LUMINANCE (CVBS/Y)ANALOG OUTPUT
When SVIDEO is a logical zero, digital composite video information drives the 9-bit D/A converter that generates
the CVBS output. When SVIDEO is a logical one, digital luminance information drives the DAC that generates
the analog Y video output.
ꢀ COMPOSITE AND CHROMINANCE (CVBS/C) ANALOG OUTPUT
When SVIDEO is a logical zero, digital composite video information drives the 9-bit D/A converter that generates
the CVBS output. When SVIDEO is a logical one, digital chrominance information drives the 9-bit D/A converter
that generates the analog C video output.
PC BOARD CONSIDERATIONS
The layout should be optimized for lowest noise on the power and ground planes by providing good decoupling.
The trace length between groups of VAA and GND pins should be as short as possible to minimize inductive
ringing. A well-designed power distribution network is critical to eliminate digital switching noise. The ground
plane must provide a low-impedance return path for the digital circuits. A PC board with a minimum of four
layers is recommended, with layers 1 (top) and 4 (bottom) for signals and layers 2 and 3 for ground and power,
respectively.
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Preliminary
SPCA701A
ꢀ COMPONENT PLACEMENT
Components should be placed as close as possible to the associated pin. The optimum layout enables the
SPCA701A to be located as close as possible to the power supply connector and the video output connector.
ꢀ POWER AND GROUND PLANES
For optimum performance, a common digital and analog ground plane is recommended. Separate digital and
analog power planes are recommended. The digital power plane should provide power to all digital logic on the
PC board, and the analog power plane should provide power to all SPCA701A power pins, VREF circuitry, and
COMP decoupling. At least a 1/8-inch gap is required in between the digital power plane and the analog power
plane. The analog power plane should be connected to the digital power plane (VCC) at a single point through a
ferrite bead, as illustrated in Figure 4, Table 6. This bead should be located within 3 inches of the SPCA701A.
The bead provides resistance to switching-currents, acting as a resistance at high frequencies.
A low-
resistance bead should be used, such as Ferroxcube 5659065-3B, Fair-Rite 2723021447, or TDK BF45-4001.
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Preliminary
SPCA701A
Figure 4. Typical Connection Diagram (Internal Voltage Reference)
Analog Power Plane
VAA
SPCA701A
L1
VCC
+3.3V (VCC)
C4
C5
COMP
VREFIN
C1
C6
VREFOUT
Ground
(Power Supply
Connector)
GND
Y/C
FSADJUST
0.1
(2)
(2)
L2
L3
CVBS/Y
CVBS/C
RF Mod
LPF
Buffer
Buffer
P
+
To Video
Connector
P
Buffer
+
4.7
VAA
P
Schottky Diodes
To Filter
DAC Output
Schottky Diodes
Regulated +5V
GND
LPF
22pF
22pF
1k
10
H
75
RF
Modulator
ZIN = 1K
75
RF
(1)
1.8
H
1.8
H
82
330pF
330pF
270pF
270pF
Audio
TRAP
Notes: (1). Some modulators may require AC coupling capacitors (10ꢁF).
(2). Optional for chroma boost.
(3). VREF must be connected to either VREF_OUT or VBIAS.
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Preliminary
SPCA701A
Table 6. Typical Parts List (Internal Voltage Reference)
Locations
C5 - 1, C7
C6
Description
Vendor Part Number
Erie RPE112Z5U104M50V
0.1 ꢁF Ceramic Capacitor
47 ꢁF Capacitor
Mallory CSR13F476KM
Fair-Rite 2743021447
L1
Ferrite Bead - Surface Mount
Ferrite Bead(z < 300ꢂ @ 5MHz)
1% Metal Film Resistor
Ceramic Resonator
L2, L3
RESET
TRAP
ATC LCB0805, Taiyo Yuden BK2125LM182
Dale CMF-55C
Murata TPSx.xMJ or MB2 (where x.x = sound
carrier frequency in MHz)
Schottky Diodes
BAT85 (BAT54F Dual) HP 5082-2305 (1N6263)
Siemens BAT 64-04 (Dual)
Note: Vendor numbers are listed only as a guide. Substitution of devices with similar characteristics will not
affect SPCA701A performance.
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Preliminary
SPCA701A
PACKAGE INFORMATION
Model Number
Package
Ambient Temperature Range
0ꢁ- 70ꢁ
SPCA701A
32-pin PLCC
NOTE: SUNPLUS TECHNOLOGY CO., LTD reserves the right to make changes at any time without notice in
order to improve the design and performance to supply the best possible product
ꢀ Sunplus Technology Co., Ltd.
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Preliminary
SPCA701A
inches
mm
Symbol
Min.
0.1
Typ.
Max.
0.14
0.09
0.02
0.03
0.49
0.45
0.43
0.59
0.55
0.53
-
Min.
2.54
1.52
0.33
0.66
12.3
11.3
9.91
14.8
13.8
12.5
-
Typ.
Max.
3.56
2.41
0.53
0.81
12.57
11.56
10.92
15.11
14.1
13.46
-
A
A1
B
-
-
0.06
0.013
0.026
0.485
0.447
0.39
0.585
0.547
0.49
-
-
-
-
-
B1
D
-
-
-
-
D1
D2
E
-
-
-
-
-
-
-
E1
E2
e
-
-
-
0.05
1.27
32
7
N
-
-
-
-
-
-
-
Nd
Ne
-
-
-
-
-
-
-
9
-
DISCLAIMER
The information appearing in this publication is believed to be accurate.
Integrated circuits sold by Sunplus Technology are covered by the warranty and patent indemnification provisions
stipulated in the terms of sale only. SUNPLUS makes no warranty, express, statutory implied or by description
regarding the information in this publication or regarding the freedom of the described chip(s) from patent
infringement. FURTHER, SUNPLUS MAKES NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR
ANY PURPOSE. SUNPLUS reserves the right to halt production or alter the specifications and prices at any
time without notice. Accordingly, the reader is cautioned to verify that the data sheets and other information in
this publication are current before placing orders. Products described herein are intended for use in normal
commercial applications. Applications involving unusual environmental or reliability requirements, e.g. military
equipment or medical life support equipment, are specifically not recommended without additional processing by
SUNPLUS for such applications. Please note that application circuits illustrated in this document are for
reference purposes only.
ꢀ Sunplus Technology Co., Ltd.
16
Rev.: 0.2 1999.12.07
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