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PDF LT1398CS Data sheet ( Hoja de datos )
| Número de pieza | LT1398CS | |
| Descripción | Low Cost Dual and Triple 300MHz Current Feedback Amplifiers with Shutdown | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s 300MHz Bandwidth on ± 5V (AV = 1, 2 and –1)
s 0.1dB Gain Flatness: 150MHz (AV = 1, 2 and –1)
s Completely Off in Shutdown, 0µA Supply Current
s High Slew Rate: 800V/µs
s Wide Supply Range:
±2V(4V) to ±6V(12V) (LT1398/LT1399)
±2V (4V) to ±7.5V (15V) (LT1399HV)
s 80mA Output Current
s Low Supply Current: 4.6mA/Amplifier
s Fast Turn-On Time: 30ns
s Fast Turn-Off Time: 40ns
s 16-Pin Narrow SO/Narrow SSOP Packages
U
APPLICATIO S
s RGB Cable Drivers
s LCD Drivers
s Spread Spectrum Amplifiers
s MUX Amplifiers
s Composite Video Cable Drivers
s Portable Equipment
TYPICAL APPLICATIO
3-Input Video MUX Cable Driver
VIN A
RG
200Ω
A
CHANNEL
SELECT
+ EN A
1/3 LT1399
–
RF
324Ω
BC
97.6Ω
75Ω
CABLE
VIN B
RG
200Ω
+ EN B
1/3 LT1399
–
RF
324Ω
97.6Ω
VOUT
75Ω
VIN C
RG
200Ω
+ EN C
1/3 LT1399
–
RF
324Ω
97.6Ω
1399 TA01
LT1398/LT1399/LT1399HV
Low Cost Dual and Triple
300MHz Current Feedback
Amplifiers with Shutdown
DESCRIPTIO
The LT®1399 and LT1399HV contain three independent
300MHz current feedback amplifiers, each with a shut-
down pin. The LT1399HV is a higher voltage version of the
LT1399. The LT1398 is a two amplifier version of the
LT1399.
The LT1398/LT1399 operate on all supplies from a single
4V to ±6V. The LT1399HV operates on all supplies from 4V
to ±7.5V.
Each amplifier draws 4.6mA when active. When disabled
each amplifier draws zero supply current and its output be-
comes high impedance. The amplifiers turn on in only 30ns
and turn off in 40ns, making them ideal in spread spectrum
and portable equipment applications.
The LT1398/LT1399/LT1399HV are manufactured on Lin-
ear Technology’s proprietary complementary bipolar pro-
cess. The LT1399/LT1399HV are pin-for-pin upgrades to
the LT1260 optimized for use on ±5V/±7.5V supplies.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Square Wave Response
OUTPUT
200mV/DIV
RL = 100Ω
RF = RG = 324Ω
f = 10MHz
TIME (10ns/DIV)
1398/99 TA02
1
1 page  
LT1398/LT1399/LT1399HV
ELECTRICAL CHARACTERISTICS (LT1399HV)
The q denotes specifications which apply over the specified operating temperature range, otherwise specifications are at TA = 25°C.
For each amplifier: VCM = 0V, VS = ±7.5V, EN = 0V, pulse tested, unless otherwise noted. (Note 4)
SYMBOL
SR
tON
tOFF
tr, tf
PARAMETER
Slew Rate (Note 6)
Turn-On Delay Time (Note 7)
Turn-Off Delay Time (Note 7)
Small-Signal Rise and Fall Time
tPD Propagation Delay
os Small-Signal Overshoot
tS Settling Time
dG Differential Gain (Note 8)
dP Differential Phase (Note 8)
CONDITIONS
AV = 10, RL = 150Ω, VS = ±5V
RF = RG = 324Ω, RL = 100Ω, VS = ±5V
RF = RG = 324Ω, RL = 100Ω, VS = ±5V
RF = RG = 324Ω, RL = 100Ω, VOUT = 1VP-P,
VS = ±5V
RF = RG = 324Ω, RL = 100Ω, VOUT = 1VP-P,
VS = ±5V
RF = RG = 324Ω, RL = 100Ω, VOUT = 1VP-P,
VS = ±5V
0.1%, AV = – 1V, RF = RG = 309Ω, RL = 150Ω,
VS = ±5V
RF = RG = 324Ω, RL = 150Ω, VS = ±5V
RF = RG = 324Ω, RL = 150Ω, VS = ±5V
MIN TYP MAX
500 800
30 75
40 100
1.3
2.5
10
25
0.13
0.10
UNITS
V/µs
ns
ns
ns
ns
%
ns
%
DEG
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: This parameter is guaranteed to meet specified performance
through design and characterization. It has not been tested.
Note 3: A heat sink may be required depending on the power supply
voltage and how many amplifiers have their outputs short circuited.
Note 4: The LT1398/LT1399/LT1399HV are guaranteed to meet specified
performance from 0°C to 70°C and are designed, characterized and
expected to meet these extended temperature limits, but are not tested at
– 40°C and 85°C. Guaranteed I grade parts are available, consult factory.
Note 5: TJ is calculated from the ambient temperature TA and the
power dissipation PD according to the following formula:
LT1398CS, LT1399CS, LT1399HVCS: TJ = TA + (PD • 100°C/W)
LT1399CGN: TJ = TA + (PD • 120°C/W)
Note 6: Slew rate is measured at ±2V on a ±3V output signal.
Note 7: Turn-on delay time (tON) is measured from control input to
appearance of 1V at the output, for VIN = 1V. Likewise, turn-off delay
time (tOFF) is measured from control input to appearance of 0.5V on
the output for VIN = 0.5V. This specification is guaranteed by design
and characterization.
Note 8: Differential gain and phase are measured using a Tektronix
TSG120YC/NTSC signal generator and a Tektronix 1780R Video
Measurement Set. The resolution of this equipment is 0.1% and 0.1°.
Ten identical amplifier stages were cascaded giving an effective
resolution of 0.01% and 0.01°.
WU
TYPICAL AC PERFOR A CE
VS (V)
±5
±5
±5
AV
1
2
–1
RL (Ω)
100
100
100
RF (Ω)
365
324
309
RG (Ω)
–
324
309
SMALL SIGNAL
– 3dB BW (MHz)
300
300
300
SMALL SIGNAL
0.1dB BW (MHz)
150
150
150
SMALL SIGNAL
PEAKING (dB)
0.05
0
0
5
5 Page 
LT1398/LT1399/LT1399HV
APPLICATI S I FOR ATIO
The enable/disable times are very fast when driven from
standard 5V CMOS logic. Each amplifier enables in about
30ns (50% point to 50% point) while operating on ±5V
supplies (Figure 2). Likewise, the disable time is approxi-
mately 40ns (50% point to 50% point) (Figure 3).
Differential Input Signal Swing
To avoid any breakdown condition on the input transis-
tors, the differential input swing must be limited to ±5V. In
normal operation, the differential voltage between the
input pins is small, so the ±5V limit is not an issue. In the
disabled mode however, the differential swing can be the
same as the input swing, and there is a risk of device
breakdown if input voltage range has not been properly
considered.
3-Input Video MUX Cable Driver
The application on the first page of this data sheet shows
a low cost, 3-input video MUX cable driver. The scope
photo below (Figure 4) displays the cable output of a
30MHz square wave driving 150Ω. In this circuit the
active amplifier is loaded by the sum of RF and RG of each
disabled amplifier. Resistor values have been chosen to
keep the total back termination at 75Ω while maintaining
a gain of 1 at the 75Ω load. The switching time between
any two channels is approximately 32ns when both
enable pins are driven.
When building the board, care was taken to minimize
trace lengths at the inverting input. The ground plane was
also pulled away from RF and RG on both sides of the
board to minimize stray capacitance.
EN A
EN B
OUTPUT
VS = ±5V
VINA = VINB = 2VP-P
at 3.58MHz
20ns/DIV
1398/99 F05
Figure 5. 3-Input Video MUX Switching Response (AV = 2)
Using the LT1399 to Drive LCD Displays
Driving the current crop of XGA and UXGA LCD displays
can be a difficult problem because they require drive
voltages of up to 12V, are usually a capacitive load of over
300pF, and require fast settling. The LT1399HV is par-
ticularly well suited for driving these LCD displays be-
cause it is capable of swinging more than ±6V on ±7.5V
supplies, and it can drive large capacitive loads with a
small series resistor at the output, minimizing settling
time. As seen in Figures 6 and 7, at a gain of +3 with a
16.9Ω output series resistor and a 330pF load, the
LT1399HV is capable of settling to 0.1% in 30ns for a 6V
step. Similarly, a 12V output step settles in 70ns.
VIN
VOUT
OUTPUT
200mV/DIV
RL = 150Ω
RF = RG = 324Ω
f = 10MHz
5ns/DIV
1398/99 F04
Figure 4. Square Wave Response
VS = ±5V
RF = 324Ω
RG = 162Ω
RS = 16.9Ω
CL = 330pF
20ns/DIV
1398/99 AI06
Figure 6. LT1399/LT1399HV Large-Signal Pulse Response
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1398CS.PDF ] | |
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