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PDF LT1468IS8 Data sheet ( Hoja de datos )
| Número de pieza | LT1468IS8 | |
| Descripción | 90MHz/ 22V/us 16-Bit Accurate Operational Amplifier | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s 90MHz Gain Bandwidth, f = 100kHz
s 22V/µs Slew Rate
s Settling Time: 900ns (AV = –1, 150µV, 10V Step)
s Low Distortion, – 96.5dB for 100kHz, 10VP-P
s Maximum Input Offset Voltage: 75µV
s Maximum Input Offset Voltage Drift: 2µV/°C
s Maximum (–) Input Bias Current: 10nA
s Minimum DC Gain: 1000V/mV
s Minimum Output Swing into 2k: ±12.8V
s Unity Gain Stable
s Input Noise Voltage: 5nV/√Hz
s Input Noise Current: 0.6pA/√Hz
s Total Input Noise Optimized for 1k < RS < 20k
s Specified at ±5V and ±15V
U
APPLICATIONS
s 16-Bit DAC Current-to-Voltage Converter
s Precision Instrumentation
s ADC Buffer
s Low Distortion Active Filters
s High Accuracy Data Acquisition Systems
s Photodiode Amplifiers
LT1468
90MHz, 22V/µs
16-Bit Accurate
Operational Amplifier
DESCRIPTIO
The LT®1468 is a precision high speed operational ampli-
fier with 16-bit accuracy and 900ns settling to 150µV for
10V signals. This unique blend of precision and AC perfor-
mance makes the LT1468 the optimum choice for high
accuracy applications such as DAC current-to-voltage
conversion and ADC buffers. The initial accuracy and drift
characteristics of the input offset voltage and inverting
input bias current are tailored for inverting applications.
The 90MHz gain bandwidth ensures high open-loop gain
at frequency for reducing distortion. In noninverting appli-
cations such as an ADC buffer, the low distortion and DC
accuracy allow full 16-bit AC and DC performance.
The 22V/µs slew rate of the LT1468 improves large-signal
performance in applications such as active filters and
instrumentation amplifiers compared to other precision
op amps.
The LT1468 is manufactured on Linear Technology’s
complementary bipolar process.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
16-Bit DAC I-to-V Converter
DAC 16
INPUTS
6k
LTC ®1597
20pF
–
LT1468
+
2k
VOUT
50pF
OFFSET: VOS + IB (6kΩ) < 1LSB
OPTIONAL NOISE FILTER
SETTLING TIME TO 150µV = 1.7µs
SETTLING LIMITED BY 6k AND 20pF TO COMPENSATE DAC OUTPUT CAPACITANCE
1468 TA01
Total Harmonic Distortion vs Frequency
– 80
VS = ±15V
AV = 2
– 90
RL = 2k
VOUT = 10VP-P
– 100
– 110
– 120
– 130
100
1k 10k
FREQUENCY (Hz)
100k
1468 TA02
1
1 page  
LT1468
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
and Temperature
7
6
125°C
5
4
25°C
3
– 55°C
2
1
0 5 10 15 20
SUPPLY VOLTAGE (± V)
1468 G01
Input Bias Current
vs Temperature
30
VS = ±15V
20
10
IB–
0
– 10
IB+
– 20
– 30
– 40
– 50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1468 G04
Warm-Up Drift vs Time
5
0
N8 ±5V
–5
–10 S0-8 ±5V
– 15
N8 ±15V
– 20
– 25
–30 S0-8 ±15V
– 35
– 40
0
20 40 60 80 100 120 140
TIME AFTER POWER UP (s)
1468 G07
Input Common Mode Range
vs Supply Voltage
V+
TA = 25°C
– 0.5 ∆VOS < 100µV
– 1.0
– 1.5
– 2.0
2.0
1.5
1.0
0.5
V–
0
3 6 9 12 15
SUPPLY VOLTAGE (± V)
18
1468 G02
Input Noise Spectral Density
1000
100 in
VS = ±15V
TA = 25°C
AV = 101
RS = 100k FOR in
10
1
en
10
0.1
1 0.01
1 10 100 1k 10k 100k
FREQUENCY (Hz)
1468 G05
Open-Loop Gain
vs Resistive Load
140
TA = 25°C
135
VS = ±15V
VS = ±5V
130
125
120
115
110
10
100 1k
LOAD RESISTANCE (Ω)
10k
1468 G08
Input Bias Current
vs Input Common Mode Voltage
80
VS = ±15V
60 TA = 25°C
40
20
IB–
0
IB+
– 20
– 40
– 60
– 80
–15 –10 – 5
0
5 10 15
INPUT COMMON MODE VOLTAGE (V)
1468 G03
0.1Hz to 10Hz Voltage Noise
VS = ±15V
TIME (1s/DIV)
1468 G06
Open-Loop Gain
vs Temperature
160
RL = 2k
150
VS = ±15V
140
130
VS = ±5V
120
110
100
90
– 50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1468 G09
5
5 Page 
LT1468
APPLICATIONS INFORMATION
Another key application for LT1468 is buffering the input
to a 16-bit A/D converter. In a gain of 1 or 2 this straight-
forward circuit provides uncorrupted AC and DC levels to
the converter, while buffering the A/D input sample-and-
hold circuit from high source impedance which can reduce
the maximum sampling rate. The front page graph shows
better than 16-bit distortion for a gain of 2 with a 10VP-P
output.
WW
SI PLIFIED SCHEMATIC
V+
I1
+ IN Q1 Q2 – IN Q5
Q3
I2
Q6
Q4
BIAS
Q7
C
I5
Q8
Q9
Q10
OUT
Q11
I3 I4
V–
I6
1468 SS
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400*
(10.160)
MAX
87 65
0.255 ± 0.015*
(6.477 ± 0.381)
0.300 – 0.325
(7.620 – 8.255)
12
0.045 – 0.065
(1.143 – 1.651)
34
0.130 ± 0.005
(3.302 ± 0.127)
0.009 – 0.015
(0.229 – 0.381)
+0.035
0.325 –0.015
( )8.255
+0.889
–0.381
0.065
(1.651)
TYP
0.100 ± 0.010
(2.540 ± 0.254)
0.125
(3.175)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
0.020
(0.508)
MIN
N8 1197
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
8 765
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
1
0.053 – 0.069
(1.346 – 1.752)
0°– 8° TYP
2
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
34
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
TYP
SO8 0996
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT1468IS8.PDF ] | |
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