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LM1276 データシート(PDF) 5 Page - Texas Instruments

部品番号 LM1276
部品情報  Compatible RGB Preamplifier
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OBSOLETE
LM1276
www.ti.com
SNOSAB9B – MAY 2005 – REVISED APRIL 2013
Electrical Characteristics - Video Signal
(1) (continued)
Unless otherwise noted: TA = 25°C, VCC = +5.0V, VIN = 0.70 VP-P, VABL = VCC, CL = 8 pF, Video Outputs = 2.0 VP-P. Setting
numbers refer to the definitions in Table 1. See
(2) for Min and Max parameters and (3) for Typicals.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
tr
Video Rise Time(6)
10% to 90%, Test Setting 4, AC input signal.
3.1
ns
See(7)
OSR
Rising Edge Overshoot
Test Setting 4, AC input signal. See(7)
2
%
tf
Video Fall Time(6)
90% to 10%, Test Setting 4, AC input signal.
2.9
ns
See(7)
OSF
Falling Edge Overshoot
Test Setting 4, AC input signal. See(7)
2
%
BW
Channel Bandwidth (
−3 dB)
Test Setting 4, AC input signal. See(7)
150
MHz
VSEP 10 kHz
Video Amplifier 10 kHz Isolation Test Setting 8. See(8)
−60
dB
VSEP 10 MHz
Video Amplifier 10 MHz
Test Setting 8. See(8)
−50
dB
Isolation
AV Max
Maximum Voltage Gain
Test Setting 8, AC input signal.
3.8
4.1
V/V
AV C-50%
Contrast Attenuation @ 50%
Test Setting 5, AC input signal.
−5.2
dB
AV Min/AV Max
Maximum Contrast Attenuation
Test Setting 2, AC input signal.
−12
dB
(dB)
AV G-50%
Gain Attenuation @ 50%
Test Setting 6, AC input signal.
−4.0
dB
AV G-Min
Maximum Gain Attenuation
Test Setting 7, AC input signal.
−11
dB
AV Match
Maximum Gain Match between
Test Setting 3, AC input signal.
±0.5
dB
Channels
AV Track
Gain Change between
Tracking when changing from Test Setting 8 to
±0.5
dB
Channels
Test Setting 5. See(9)
VidThreshold
Video Threshold
Normal Operation
80
mV
VABL TH
ABL Control Range Upper Limit
Test Setting 4, AC input signal. See(10)
4.8
V
VABL Range
ABL Gain Reduction Range
Test Setting 4, AC input signal. See(10)
2.8
V
AV 3.5/AV Max
ABL Gain Reduction at 3.5V
Test Setting 4, AC input signal. VABL = 3.5V
(10)
−2
dB
AV 2.0/AV Max
ABL Gain Reduction at 2.0V
Test Setting 4, AC input signal. VABL = 2.0V
(10)
−12
dB
IABL Max
ABL Input Current Sink
Test Setting 4, AC input signal. See(10)
2.5
mA
Capability
VABL Max
Maximum ABL Input Voltage
Test Setting 4, AC input signal. IABL = IABL
VCC + 0.1
V
during Clamping
MAX(10)
AV ABL Track
ABL Gain Tracking Error
Test Setting 4, 0.7 VP-P input signal, ABL
5.0
%
voltage set to 4.5V and 2.5V. See(11)
RIP
Minimum Input Resistance (pins Test Setting 4.
20
M
5, 6, 7)
(6)
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.
(7)
Input from signal generator: tr, tf < 1 ns.
(8)
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.
(9)
ΔAV 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 AVC−50% 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 AVC−50%. This yields a typical gain change of 10.0 dB with a tracking change of ±0.2 dB.
(10) The ABL input provides smooth decrease in gain over the operational range of 0 dB to
−5 dB:
ΔAABL = 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.
(11) 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.
Copyright © 2005–2013, Texas Instruments Incorporated
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