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PDF LT1206CR Data sheet ( Hoja de datos )
| Número de pieza | LT1206CR | |
| Descripción | 250mA/60MHz Current Feedback Amplifier | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s 250mA Minimum Output Drive Current
s 60MHz Bandwidth, AV = 2, RL = 100Ω
s 900V/µs Slew Rate, AV = 2, RL = 50Ω
s 0.02% Differential Gain, AV = 2, RL = 30Ω
s 0.17° Differential Phase, AV = 2, RL = 30Ω
s High Input Impedance, 10MΩ
s Wide Supply Range, ±5V to ±15V
s Shutdown Mode: IS < 200µA
s Adjustable Supply Current
s Stable with CL = 10,000pF
U
APPLICATIO S
s Video Amplifiers
s Cable Drivers
s RGB Amplifiers
s Test Equipment Amplifiers
s Buffers
LT1206
250mA/60MHz Current
Feedback Amplifier
DESCRIPTIO
The LT1206 is a current feedback amplifier with high
output current drive capability and excellent video char-
acteristics. The LT1206 is stable with large capacitive
loads, and can easily supply the large currents required
by the capacitive loading. A shutdown feature switches
the device into a high impedance, low current mode,
reducing dissipation when the device is not in use. For
lower bandwidth applications, the supply current can be
reduced with a single external resistor. The low differen-
tial gain and phase, wide bandwidth, and the 250mA
minimum output current drive make the LT1206 well
suited to drive multiple cables in video systems.
The LT1206 is manufactured on Linear Technology’s
proprietary complementary bipolar process.
U
TYPICAL APPLICATIO S
Noninverting Amplifier with Shutdown
15V
VIN +
LT1206 COMP
– S/D**
CCOMP
0.01µF*
VOUT
– 15V
RF
ENABLE
15V
5V 24k
74C906
RG *OPTIONAL, USE WITH CAPACITIVE LOADS
**GROUND SHUTDOWN PIN FOR
NORMAL OPERATION
LT1206 • TA01
Large-Signal Response, CL = 10,000pF
VS = ±15V
RL = ∞
RF = RG = 3k
LT1206 • TA02
1
1 page  
WU
TYPICAL PERFOR A CE CHARACTERISTICS
LT1206
Bandwidth vs Supply Voltage
100
90
PEAKING ≤ 0.5dB
PEAKING ≤ 5dB
AV = 2
RL = 100Ω
80
70 RF = 470Ω
60
RF = 560Ω
RF = 680Ω
50
40 RF = 750Ω
30
20 RF = 1k
10 RF = 1.5k
0
4 6 8 10 12 14 16 18
SUPPLY VOLTAGE (±V)
LT1206 • TPC01
Bandwidth vs Supply Voltage
100
90
PEAKING ≤ 0.5dB
PEAKING ≤ 5dB
AV = 10
RL = 100Ω
80
70
60 RF =390Ω
RF = 330Ω
50
40 RF = 470Ω
30
20 RF = 680Ω
10 RF = 1.5k
0
4 6 8 10 12 14 16 18
SUPPLY VOLTAGE (±V)
LT1206 • TPC04
Differential Phase
vs Supply Voltage
0.50
0.40
RL = 15Ω
0.30
RF = RG = 560Ω
AV = 2
N PACKAGE
0.20
RL = 30Ω
0.10
0
5
RL = 50Ω
RL = 150Ω
7 9 11 13
SUPPLY VOLTAGE (±V)
15
LT1206 • TPC07
Bandwidth vs Supply Voltage
50
PEAKING ≤ 0.5dB
PEAKING ≤ 5dB
AV = 2
RL = 10Ω
40
RF = 560Ω
30 RF = 750Ω
20 RF = 1k
RF = 2k
10
0
4 6 8 10 12 14 16 18
SUPPLY VOLTAGE (±V)
LT1206 • TPC02
Bandwidth vs Supply Voltage
50
PEAKING ≤ 0.5dB
PEAKING ≤ 5dB
AV = 10
RL = 10Ω
40
30 RF = 560Ω
20 RF = 680Ω
RF = 1k
10 RF = 1.5k
0
4 6 8 10 12 14 16 18
SUPPLY VOLTAGE (±V)
LT1206 • TPC05
Differential Gain
vs Supply Voltage
0.10
0.08 RL = 15Ω
RF = RG = 560Ω
AV = 2
N PACKAGE
0.06
0.04
0.02
0
5
RL = 30Ω
RL = 50Ω
RL = 150Ω
7 9 11 13
SUPPLY VOLTAGE (±V)
15
LT1206 • TPC08
Bandwidth and Feedback Resistance
vs Capacitive Load for 0.5dB Peak
10k 100
BANDWIDTH
1k 10
FEEDBACK RESISTOR
AV = 2
RL = ∞
VS = ±15V
CCOMP = 0.01µF
100
1 10
100
1000
CAPACITIVE LOAD (pF)
1
10000
LT1206 • TPC03
Bandwidth and Feedback Resistance
vs Capacitive Load for 5dB Peak
10k 100
BANDWIDTH
1k 10
FEEDBACK RESISTOR
AV = +2
RL = ∞
VS = ±15V
CCOMP = 0.01µF
100 1
1
10 100
1k 10k
CAPACITIVE LOAD (pF)
LT1206 • TPC06
Spot Noise Voltage and Current
vs Frequency
100
– in
10
1
10
en
in
100 1k 10k
FREQUENCY (Hz)
100k
LT1206 • TPC09
5
5 Page 
LT1206
APPLICATI S I FOR ATIO
the maximum allowable input voltage. To allow for some
margin, it is recommended that the input signal be less
than ±5V when the device is shut down.
RF = 750Ω
RL = 50Ω
LT1206 • F04c
Figure 5c. Large-Signal Response, AV = 2
When the LT1206 is used to drive capacitive loads, the
available output current can limit the overall slew rate. In
the fastest configuration, the LT1206 is capable of a slew
rate of over 1V/ns. The current required to slew a capacitor
at this rate is 1mA per picofarad of capacitance, so
10,000pF would require 10A! The photo (Figure 6) shows
the large signal behavior with CL = 10,000pF. The slew rate
is about 60V/µs, determined by the current limit of 600mA.
Capacitance on the Inverting Input
Current feedback amplifiers require resistive feedback
from the output to the inverting input for stable operation.
Take care to minimize the stray capacitance between the
output and the inverting input. Capacitance on the invert-
ing input to ground will cause peaking in the frequency
response (and overshoot in the transient response), but it
does not degrade the stability of the amplifier.
Power Supplies
The LT1206 will operate from single or split supplies from
±5V (10V total) to ±15V (30V total). It is not necessary to
use equal value split supplies, however the offset voltage
and inverting input bias current will change. The offset
voltage changes about 500µV per volt of supply mis-
match. The inverting bias current can change as much as
5µA per volt of supply mismatch, though typically the
change is less than 0.5µA per volt.
VS = ±15V
RF = RG = 3k
RL = ∞
LT1206 • F06
Figure 6. Large-Signal Response, CL = 10,000pF
Differential Input Signal Swing
The differential input swing is limited to about ±6V by an
ESD protection device connected between the inputs. In
normal operation, the differential voltage between the
input pins is small, so this clamp has no effect; however,
in the shutdown mode the differential swing can be the
same as the input swing. The clamp voltage will then set
Thermal Considerations
The LT1206 contains a thermal shutdown feature which
protects against excessive internal (junction) tempera-
ture. If the junction temperature of the device exceeds the
protection threshold, the device will begin cycling be-
tween normal operation and an off state. The cycling is not
harmful to the part. The thermal cycling occurs at a slow
rate, typically 10ms to several seconds, which depends on
the power dissipation and the thermal time constants of
the package and heat sinking. Raising the ambient tem-
perature until the device begins thermal shutdown gives a
good indication of how much margin there is in the
thermal design.
For surface mount devices heat sinking is accomplished
by using the heat spreading capabilities of the PC board
and its copper traces. Experiments have shown that the
heat spreading copper layer does not need to be electri-
cally connected to the tab of the device. The PCB material
can be very effective at transmitting heat between the pad
area attached to the tab of the device, and a ground or
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1206CR.PDF ] | |
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