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參數(shù)資料
| 型號(hào)： | LM1238AAF/NA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| 封裝： | N24D |
| 文件頁數(shù)： | 20/24頁 |
| 文件大?。?/td> | 1207K |
| 代理商： | LM1238AAF/NA |
System Interface Signal Characteristics (Continued)
Note 5: Input from signal generator: tr,tf < 1 ns.
Note 6: Typical specifications are specified at +25C and represent the most likely parametric norm.
Note 7: Tested limits are guaranteed to National’s AOQL; (Average Outgoing Quality Level).
Note 8: The supply current specified is the quiescent current for VCC and 5V Dig with RL = ∞. 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 VP-P level at the input. All 16 steps equal,
with each at least 100 ns in duration.
Note 10: dt/dVCC = 200*(t5.5V–t4.5V)/ ((t5.5V + t4.5V)) %/V, where:
t5.5V is the rise or fall time at VCC = 5.5V, and t4.5V is the rise or fall time at VCC = 4.5V.
Note 11:
AV 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 AVC50% and measured relative to the AV max condition. For example, at AV max 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 AVC50%. This yields a typical
gain change of 10.0 dB with a tracking change of ±0.2 dB.
Note 12: ABL should provide smooth decrease in gain over the operational range of 0 dB to 5 dB
AABL = A(VABL =VABL MAX GAIN)– A (VABL =VABL MIN GAIN)
Beyond 5 dB the gain characteristics, linearity and pulse response may depart from normal values.
Note 13: Machine Model ESD test is covered by specification EIAJ IC-121-1981. A 200 pF cap is charged to the specific voltage, then discharged directly into the
IC with no external series resistor (resistance of discharge path must be under 50
).
Note 14: Measure output levels of the other two undriven amplifiers relative to the driven amplifier to determine channel separation. Terminate the undriven amplifier
inputs to simulate generator loading. Repeat test at fIN = 10 MHz for VSEP 10 MHZ.
Note 15: A minimum pulse width of 200 ns is the guaranteed minimum for a horizontal line of 15 kHz. This limit is guaranteed by design. If a lower line rate is used
then a longer clamp pulse may be required.
Note 16: Adjust input frequency from 10 MHz (AV max reference level) to the 3 dB corner frequency (f3 dB).
Note 17: Once the spot killer has been activated, the LM1238 remains in the off state until VCC is cycled (reduced below 0.5V and then restored to 5V).
Hexadecimal and Binary Notation
Hexadecimal numbers appear frequently throughout this
document, representing slave and register addresses, and
register values. These appear in the format “0x...”. For ex-
ample, the slave address for writing the registers of the
LM1238 is hexadecimal BA, written as 0xBA. On the other
hand, binary values, where the individual bit values are
shown, are indicated by a trailing “b”. For example, 0xBA is
equal to 10111010b. A subset of bits within a register is
referred to by the bit numbers in brackets following the
register value. For example, the OSD contrast bits are the
fourth and fifth bits of register 0x0818. Since the first bit is bit
0, the OSD contrast register is 0x0818[4:3].
Register Test Settings
Table 1 shows the definitions of the Test Settings 1–8 re-
ferred to in the specifications sections. Each test setting is a
combination of five hexadecimal register values, Contrast,
Gain (Blue, Red, Green) and DC offset.
TABLE 1. Test Setting Definitions
Control
No. of Bits
Test Settings
1234
567
8
Contrast
7
0x7F
(Max)
0x00
Min
0x7F
(Max)
0x7F
(Max)
0x40
(50.4%)
0x7F
(Max)
0x7F
(Max)
0x7F
(Max)
B, R, G
Gain
7
0x7F
(Max)
0x7F
(Max)
0x7F
(Max)
Set V
O to
2V
P-P
0x7F
(Max)
0x40
(50%)
0x00
(Min)
0x7F
(Max)
DC Offset
3
0x00
(Min)
0x05
0x07
(Max)
0x05
LM1238
www.national.com
5
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