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PDF LT1819IS8 Data sheet ( Hoja de datos )
| Número de pieza | LT1819IS8 | |
| Descripción | 400MHz/ 2500V/ms/ 9mA Single/Dual Operational Amplifiers | |
| Fabricantes | Linear Technology | |
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LT1818/LT1819
400MHz, 2500V/µs, 9mA
Single/Dual Operational Amplifiers
FEATURES
s 400MHz Gain Bandwidth Product
s 2500V/µs Slew Rate
s –85dBc Distortion at 5MHz
s 9mA Supply Current Per Amplifier
s Space Saving SOT-23 and MS8 Packages
s 6nV/√Hz Input Noise Voltage
s Unity-Gain Stable
s 1.5mV Maximum Input Offset Voltage
s 8µA Maximum Input Bias Current
s 800nA Maximum Input Offset Current
s 40mA Minimum Output Current, VOUT = ±3V
s ±3.5V Minimum Input CMR, VS = ±5V
s Specified at ±5V, Single 5V Supplies
s Operating Temperature Range: – 40°C to 85°C
U
APPLICATIO S
s Wideband Amplifiers
s Buffers
s Active Filters
s Video and RF Amplification
s Communication Receivers
s Cable Drivers
s Data Acquisition Systems
DESCRIPTIO
The LT®1818/LT1819 are single/dual wide bandwidth,
high slew rate, low noise and distortion operational ampli-
fiers with excellent DC performance. The LT1818/LT1819
have been designed for wider bandwidth and slew rate,
much lower input offset voltage and lower noise and
distortion than devices with comparable supply current.
The circuit topology is a voltage feedback amplifier with
the excellent slewing characteristics of a current feedback
amplifier.
The output drives a 100Ω load to ±3.8V with ±5V supplies.
On a single 5V supply, the output swings from 1V to 4V
with a 100Ω load connected to 2.5V. The amplifier is unity-
gain stable with a 20pF capacitive load without the need for
a series resistor. Harmonic distortion is –85dBc up to
5MHz for a 2VP-P output at a gain of 2.
The LT1818/LT1819 are manufactured on Linear
Technology’s advanced low voltage complementary bipo-
lar process. The LT1818 (single op amp) is available in
SOT-23 and SO-8 packages; the LT1819 (dual op amp) is
available in MSOP-8 and SO-8 packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Single Supply Unity-Gain ADC Driver for Oversampling Applications
2.5VDC
±1VAC
5V
+
LT1818
–
5V
51.1Ω
18pF
LTC1744
AIN+ 14 BITS
50Msps
2.5V AIN– (SET FOR 2VP-P
FULL SCALE)
18189 TA01
FFT of Single Supply ADC Driver
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
0
fIN = 5.102539MHz
fS = 50Msps
VIN = 300mVP-P
SFDR = 78dB
8192 POINT FFT
NO WINDOWING
OR AVERAGING
23
5M 10M 15M 20M
FREQUENCY (Hz)
25M
18189 TA02
18189f
1
1 page  
LT1818/LT1819
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C (Note 9). VS = 5V, 0V; VCM = 2.5V, RL to 2.5V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
IOUT Output Current
ISC Output Short-Circuit Current
SR Slew Rate
FPBW
GBW
Full Power Bandwidth
Gain Bandwidth Product
tr, tf Rise Time, Fall Time
tPD Propagation Delay
OS Overshoot
HD Harmonic Distortion
dG Differential Gain
dP Differential Phase
IS Supply Current
VOUT = 1.5V or 3.5V, 30mV Overdrive
TA = 0°C to 70°C
TA = –40°C to 85°C
VOUT = 2.5V, 1V Overdrive (Note 3)
TA = 0°C to 70°C
TA = –40°C to 85°C
AV = 1
AV = –1 (Note 5)
TA = 0°C to 70°C
TA = –40°C to 85°C
2VP-P (Note 6)
f = 4MHz, RL = 500Ω
TA = 0°C to 70°C
TA = –40°C to 85°C
AV = 1, 10% to 90%, 0.1V Step
AV = 1, 50% to 50%, 0.1V Step
AV = 1, 0.1V, RL = 100Ω
HD2, AV = 2, f = 5MHz, VOUT = 2VP-P, RL = 500Ω
HD3, AV = 2, f = 5MHz, VOUT = 2VP-P, RL = 500Ω
AV = 2, RL = 150Ω
AV = 2, RL = 150Ω
Per Amplifier
TA = 0°C to 70°C
TA = –40°C to 85°C
±30
q ±25
q ±20
±80
q ±70
q ±50
450
q 375
q 300
240
q 230
q 220
q
q
±50
±140
1000
800
125
360
0.7
1.1
20
– 72
– 74
0.07
0.07
8.5
10
13
14
mA
mA
mA
mA
mA
mA
V/µs
V/µs
V/µs
V/µs
MHz
MHz
MHz
MHz
ns
ns
%
dBc
dBc
%
DEG
mA
mA
mA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Differential inputs of ±6V are appropriate for transient operation
only, such as during slewing. Large sustained differential inputs can cause
excessive power dissipation and may damage the part.
Note 3: A heat sink may be required to keep the junction temperature
below absolute maximum when the output is shorted indefinitely.
Note 4: Input offset voltage is pulse tested and is exclusive of warm-up
drift.
Note 5: With ±5V supplies, slew rate is tested in a closed-loop gain of –1
by measuring the rise time of the output from –2V to 2V with an output
step from –3V to 3V. With single 5V supplies, slew rate is tested in a
closed-loop gain of –1 by measuring the rise time of the output from 1.5V
to 3.5V with an output step from 1V to 4V. Falling edge slew rate is not
production tested, but is designed, characterized and expected to be within
10% of the rising edge slew rate.
Note 6: Full power bandwidth is calculated from the slew rate:
FPBW = SR/2πVP
Note 7: This parameter is not 100% tested.
Note 8: The LT1818C/LT1818I and LT1819C/LT1819I are guaranteed
functional over the operating temperature range of – 40°C to 85°C.
Note 9: The LT1818C/LT1819C are guaranteed to meet specified
performance from 0°C to 70°C and is designed, characterized and
expected to meet the extended temperature limits, but is not tested at
–40°C and 85°C. The LT1818I/LT1819I are guaranteed to meet the
extended temperature limits.
Note 10: Thermal resistance (θJA) varies with the amount of PC board
metal connected to the package. The specified values are for short traces
connected to the leads. If desired, the thermal resistance can be
significantly reduced by connecting the V– pin to a large metal area.
18189f
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5 Page 
LT1818/LT1819
APPLICATIO S I FOR ATIO
Slew Rate
The slew rate of the LT1818/LT1819 is proportional to the
differential input voltage. Highest slew rates are therefore
seen in the lowest gain configurations. For example, a 6V
output step with a gain of 10 has a 0.6V input step, whereas
at unity gain there is a 6V input step. The LT1818/LT1819
is tested for slew rate at a gain of –1. Lower slew rates
occur in higher gain configurations, whereas the highest
slew rate (2500V/µs) occurs in a noninverting unity-gain
configuration.
Power Dissipation
The LT1818/LT1819 combine high speed and large output
drive in small packages. It is possible to exceed the
maximum junction temperature specification (150°C)
under certain conditions. Maximum junction temperature
(TJ) is calculated from the ambient temperature (TA),
power dissipation per amplifier (PD) and number of ampli-
fiers (n) as follows:
TJ = TA + (n • PD • θJA)
Power dissipation is composed of two parts. The first is
due to the quiescent supply current and the second is due
to on-chip dissipation caused by the load current. The
worst-case load-induced power occurs when the output
voltage is at 1/2 of either supply voltage (or the maximum
swing if less than 1/2 the supply voltage). Therefore PDMAX
is:
PDMAX = (V+ – V–) • (ISMAX) + (V+/2)2/RL or
PDMAX = (V+ – V–) • (ISMAX) +
(V+ – VOMAX) • (VOMAX/RL)
Example: LT1819IS8 at 85°C, VS = ±5V, RL = 100Ω
PDMAX = (10V) • (14mA) + (2.5V)2/100Ω = 202.5mW
TJMAX = 85°C + (2 • 202.5mW) • (150°C/W) = 146°C
Circuit Operation
The LT1818/LT1819 circuit topology is a true voltage
feedback amplifier that has the slewing behavior of a
current feedback amplifier. The operation of the circuit can
be understood by referring to the Simplified Schematic.
Complementary NPN and PNP emitter followers buffer the
inputs and drive an internal resistor. The input voltage
appears across the resistor, generating a current that is
mirrored into the high impedance node.
Complementary followers form an output stage that buffer
the gain node from the load. The input resistor, input stage
transconductance and the capacitor on the high imped-
ance node determine the bandwidth. The slew rate is
determined by the current available to charge the gain
node capacitance. This current is the differential input
voltage divided by R1, so the slew rate is proportional to
the input step. Highest slew rates are therefore seen in the
lowest gain configurations.
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| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet LT1819IS8.PDF ] | |
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