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PDF LT6205 Data sheet ( Hoja de datos )
| Número de pieza | LT6205 | |
| Descripción | (LT6205 - LT6207) Video Op Amps | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT6205 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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FEATURES
s 450V/µs Slew Rate
s 100MHz Gain Bandwidth Product
s Wide Supply Range 2.7V to 12.6V
s Output Swings Rail-to-Rail
s Input Common Mode Range Includes Ground
s High Output Drive: 50mA
s Channel Separation: 90dB at 10MHz
s Specified on 3V, 5V, and ±5V Supplies
s Input Offset Voltage: 1mV
s Low Power Dissipation: 20mW Per Amplifier on
Single 5V
s Operating Temperature Range: –40°C to 85°C
s Single in SOT-23, Dual in MSOP,
Quad in SSOP Package
U
APPLICATIO S
s Video Line Driver
s Automotive Displays
s RGB Amplifiers
s Coaxial Cable Drivers
s Low Voltage High Speed Signal Processing
TYPICAL APPLICATIO
Baseband Video Splitter/Cable Driver
3.3V
499Ω
499Ω
VIN
75Ω
2–
3+
5+
6–
499Ω
499Ω
1µF
8
LT6206
75Ω
1
VOUT1
75Ω
7 75Ω
VOUT2
75Ω
4
F3dB ≈ 50MHz
IS ≤ 25mA
620567 TA01a
LT6205/LT6206/LT6207
Single/Dual/Quad
Single Supply 3V,
100MHz Video Op Amps
DESCRIPTIO
The LT®6205/LT6206/LT6207 are low cost single/dual/
quad voltage feedback amplifiers that feature 100MHz
gain-bandwidth product, 450V/µs slew rate and 50mA
output current. These amplifiers have an input range that
includes ground and an output that swings within 60mV of
either supply rail, making them well suited for single
supply operation.
These amplifiers maintain their performance for supplies
from 2.7V to 12.6V and are specified at 3V, 5V and ±5V.
The inputs can be driven beyond the supplies without
damage or phase reversal of the output. Isolation between
channels is high, over 90dB at 10MHz.
The LT6205 is available in the 5-pin SOT-23, and the
LT6206 is available in an 8-lead MSOP package with
standard op amp pin-outs. For compact layouts the quad
LT6207 is available in the 16-pin SSOP package. These
devices are specified over the commercial and industrial
temperature ranges.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Output Step Response
VOUT
0V
VIN
0V
VS = 3.3V
VIN = 0.1V TO 1.1V
f = 10MHz
20ns/DIV
620567 TA01b
620567f
1
1 page  
LT6205/LT6206/LT6207
TYPICAL PERFOR A CE CHARACTERISTICS
VOS Distribution
40
VS = 5V, 0V
35 VCM = 1V
30
25
20
15
10
5
0
–3 –2 –1 0 1 2
INPUT OFFSET VOLTAGE (mV)
3
620567 G01
Change in Offset Voltage vs Input
Common Mode Voltage
1000
VS = 5V, 0V
800
600
400
200
0
0
TA = 25°C
TA =125°C
TA = –55°C
1234
INPUT COMMON MODE VOLTAGE (V)
5
620567 G04
Output Saturation Voltage vs
Load Current (Output Low)
10
VS = 5V, 0V
VOD = 30mV
TA = 125°C
1
TA = 25°C
0.1 TA = –55°C
0.01
0.01
0.1 1
10
LOAD CURRENT (mA)
100
620567 G07
Supply Current per Amplifier vs
Supply Voltage
5
TA = 125°C
4
TA = 25°C
3 TA = –55°C
2
1
0
0 1 2 3 4 5 6 7 8 9 10 11 12
TOTAL SUPPLY VOLTAGE (V)
620567 G02
Input Bias Current vs Input
Common Mode Voltage
–2
VS = 5V, 0V
–3
–4
–5
–6 TA = 125°C
–7
–8
–9 TA = 25°C
–10
–11
–12
0
TA = –55°C
1234
INPUT COMMON MODE VOLTAGE (V)
5
620567 G05
Output Saturation Voltage vs
Load Current (Output High)
10
VS = 5V, 0V
VOD = 30mV
TA = 125°C
1
TA = 25°C
0.1
TA = –55°C
0.01
0.01
0.1 1
10
LOAD CURRENT (mA)
100
620567 G08
Minimum Supply Voltage
100
0
–100
–200
–300
–400
TA = –55°C
TA = 25°C
TA =125°C
–500
–600
1.5
2.0 2.5 3.0 3.5 4.0 4.5 5.0
TOTAL SUPPLY VOLTAGE (V)
620567 G03
Input Bias Current vs
Temperature
–4
VS = 5V, 0V
–5 VCM = 1V
–6
–7
–8
–9
–10
–11
–12
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
620567 G06
Short-Circuit Current vs
Temperature
75
70 SINKING
SOURCING
65 VS = 5V, 0V
VCM = 1V
60
SINKING
55
SOURCING
50
45 VS = 3V, 0V
VCM = 1V
40
35
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
620567 G09
620567f
5
5 Page 
LT6205/LT6206/LT6207
APPLICATIO S I FOR ATIO
invisible on a CRT. The “black” level of the waveform is at
(or “setup” very slightly above) the upper limit of the sync
information. Waveform content above the black-level is
intensity information, with peak brightness represented at
the maximum signal level. In the case of composite video,
the modulated color subcarrier is superimposed on the
waveform, but the dynamics remain inside the 1VP-P limit
(a notable exception is the chroma ramp used for differen-
tial-gain and differential-phase measurements, which can
reach 1.15VP-P).
DC-Coupled Video Amplifier Considerations
Typically video amplifiers drive cables that are series
terminated (“back-terminated”) at the source and load-
terminated at the destination with resistances equal to the
cable characteristic impedance, Z0 (usually 75Ω). This
configuration forms a 2:1 resistor divider in the cabling
that must be accounted for in the driver amplifier by
delivering 2VP-P output into an effective 2 • Z0 load (e.g.
150Ω). Driving the cable can require more than 13mA
while the output is approaching the saturation-limits of the
amplifier output. The absolute minimum supply is: VMIN =
2 + VOH +VOL. For example, the LT6206 dual operating on
3.3V as shown on the front page of this datasheet, with
exceptionally low VOH ≤ 0.5V and VOL ≤ 0.35V, provides a
design margin of 0.45V. The design margin must be large
enough to include supply variations and DC bias accuracy
for the DC-coupled video input.
Handling AC-Coupled Video Signals
AC-coupled video inputs are intrinsically more difficult to
handle than those with DC-coupling because the average
signal voltage of the video waveform is effected by the
picture content, meaning that the black-level at the ampli-
fier “wanders” with scene brightness. The wander is
measured as 0.56V for a 1VP-P NTSC waveform changing
from black-field to white-field and vice-versa, so an addi-
tional 1.12V allowance must be made in the amplifier
supply (assuming gain of 2, so VMIN = 3.12 + VOH +VOL).
For example, an LT6205 operating on 5V has a conserva-
tive design margin of 1.03V. The amplifier output (for gain
of 2) must swing +1.47V to –1.65V around the DC-
operating point, so the biasing circuitry needs to be
designed accordingly for optimal fidelity.
Clamped AC-Input Cable Driver
A popular method of further minimizing supply require-
ments with AC-coupling is to employ a simple clamping
scheme as shown in Figure 2. In this circuit, the LT6205
operates from 3.3V by having the sync-tips control the
charge on the coupling capacitor C1, thereby reducing the
black-level input wander to ≈ 0.07V. The only minor
drawback to this circuit is the slight sync-tip compression
(≈ 0.025V at input) due to the diode conduction current,
though the picture content remains full fidelity. This circuit
has nearly the design margin of its DC-coupled counter-
part, at 0.31V (for this circuit, VMIN = 2.14 + VOH +VOL). The
clamp-diode anode bias is selected to set the sync-tip
output voltage at or slightly above VOL.
YPbPr to RGB Component-Video Converter
The back-page application uses the LT6207 quad to imple-
ment a minimum amplifier count topology to transcode
consumer component-video into RGB. In this circuit,
signals only pass through one active stage from any input
to any output, with passive additions being performed by
the cable back-termination resistors. The compromise in
using passive output addition is that the amplifier outputs
must be twice as large as that of a conventional cable
driver. The Y-channel section also has the demanding
requirement that it single-handedly drives all three out-
puts to full brightness during times of white content, so a
helper current source is used to assure unclipped video
when operating from ±5V supplies. This circuit maps
sync-on-Y to sync on all the RGB channels, and for best
results should have input black-levels at 0V nominal to
prevent clipping.
620567f
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT6205.PDF ] | |
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