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參數資料
| 型號： | LM1229VEC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | I2C Compatible CMOS TV RGB and Deflection Processor |
| 中文描述： | WAVEFORM GENERATION, PQFP64 |
| 封裝： | PLASTIC, QFP-64 |
| 文件頁數： | 7/27頁 |
| 文件大?。?/td> | 969K |
| 代理商： | LM1229VEC |
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System Interface Signal Characteristics
(Continued)
Unless otherwise noted: T
= 25C, V
= +5.0V, V
= 0.7V, V
ABL
= V
CC
, C
L
= 10 pF, Video Outputs = 2.4 V
P-P
. See (Note 7)
for Min and Max parameters and (Note 6) for Typicals.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I
L
Logic low input current
(SCL, SDA, HSYNC, VSYNC)
Logic high input current
(SCL, SDA, HSYNC, VSYNC)
Logic low output voltage (SCL,
SDA)
I
IN
blank detection threshold (pin
24)
Flyback input
SDA or SCL, Input Voltage = 0V
±
10
μA
I
H
SDA or SCL, Input Voltage = 5.0V
±
10
μA
V
OL
I
O
= 3 mA
0.5
V
I
FB THRESHOLD
20
μA
I
FB IN MAX
Absolute maximum current during
flyback
Design value - AC coupled
Absolute maximum during scan
+ Zero crossing of I
FB
to 50% of
output blanking start. I
FB
= +1.5 mA
Zero crossing of I
FB
to 50% of
output blanking end. I
FB
= 100 μA
CONTRAST[6:0], RGAIN[6:0],
GGAIN[6:0], BGAIN[6:0] = 0x7F,
BRIGHTNESS[7:0] = 0x00,
OFFSET[3:0] = 0xC, AC input
signal.
See (Note 15)
To guarantee low state
To guarantee high state
V
23
= 0V
V
23
= 5.0V
Referenced to RGB video inputs.
5
mA
I
FB IN MAX
I
FB OUT MAX
t
H-BLANK ON
Peak flyback input current
Flyback input current
Blanking time delay - on
1.0
mA
μA
500
50
ns
t
H-BLANK OFF
Blanking time delay - off
50
ns
V
BLANK MAX
Maximum video blanking level
0
0.25
V
t
PW CLAMP
V
CLAMP MAX
V
CLAMP MIN
I
CLAMP LOW
I
CLAMP HIGH
t
CLAMP-VIDEO
Minimum clamp pulse width
Maximum low level clamp voltage
Minimum high level clamp voltage
Clamp gate low input current
Clamp gate high input current
Minimum wait from end of clamp
pulse to start of video.
Low limit of pin 20 HEHT input
High limit of pin 20 HEHT input
Low limit of pins 8 and 9 VEHT
inputs
High limit of pins 8 and 9 VEHT
inputs
200
ns
V
V
μA
μA
1.0
3.0
0.4
0.4
50
ns
V
HEHT-LOW
V
HEHT-HIGH
V
VEHT1-LOW
,
V
VEHT2-LOW
V
VEHT1-HIGH,
V
VEHT2-HIGH
1.4
3.4
V
V
1
V
4
V
Note 1:
Limits of Absolute Maximum Ratings indicate below which damage to the device will not occur.
Note 2:
All voltages are measured with respect to GND, unless otherwise specified.
Note 3:
Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits.
Note 4:
Human body model, 100 pF discharged through a 1.5 k
resistor.
Note 5:
Input from signal generator: t
r
, t
f
<
1 ns.
Note 6:
Typical specifications are specified at +25C and represent the most likely parametric norm.
Note 7:
Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. The guaranteed specifications apply only for the test conditions
listed. Some performance characteristics may change when the device is not operated under the listed test conditions.
Note 8:
The supply current specified is the quiescent current for V
CC
= 5V and with R
L
=
∞
. Load resistors are not required and are not used in the test circuit,
therefore all the supply current is used by the pre-amp.
Note 9:
Linearity Error is the maximum variation in step height of a 16 step staircase input signal waveform with a 0.7 V
P-P
level at the input. All 16 steps equal,
with each at least 100 ns in duration.
Note 10:
dt/dV
CC
= 200*(t
5.5V
–t
4.5V
)/((t
5.5V
+ t
4.5V
)) %/V, where: t
5.5V
is the rise or fall time at V
CC
= 5.5V, and t
4.5V
is the rise or fall time at V
CC
= 4.5V.
Note 11:
A
track is a measure of the ability of any two amplifiers to track each other and quantifies the matching of the three gain stages. It is the difference in
gain change between any two amplifiers with the contrast set to A
and measured relative to the A
condition. For example, at A
the three amplifiers’
gains might be 12.1 dB, 11.9 dB, and 11.8 dB and change to 2.2 dB, 1.9 dB and 1.7 dB respectively for contrast set to A
V 50%
. This yields a typical gain change of
10.0 dB with a tracking change of
±
0.2 dB.
Note 12:
TheABL input provides smooth decrease in gain over the operational range of 0 dB to 5 dB:
A
ABL
=A
V MAX
– A
V
(V
ABL
= V
ABL MIN GAIN
). Beyond 5 dB
the gain characteristics, linearity and pulse response may depart from normal values.
L
www.national.com
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