lt1468-2 Linear Technology Corporation, lt1468-2 Datasheet

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lt1468-2

Manufacturer Part Number
lt1468-2
Description
200mhz, 30v/?s 16-bit Accurate Av ? 2 Op Amp
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
APPLICATIONS
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TYPICAL APPLICATION
INPUTS
OFFSET: V
SETTLING TIME TO 150μV = 1.6μs
SETTLING LIMITED BY 6k AND 20pF TO COMPENSATE DAC OUTPUT CAPACITANCE
DAC
Stable in Gain A
200MHz Gain Bandwidth Product
30V/μs Slew Rate
Settling Time: 800ns (10V Step, 150μV)
Specifi ed at ±5V and ±15V Supplies
Low Distortion, – 96.5dB for 100kHz, 10V
Maximum Input Offset Voltage: 75μV
Maximum Input Offset Voltage Drift: 2μV/°C
Maximum (–) Input Bias Current: 10nA
Minimum DC Gain: 1000V/mV
Minimum Output Swing into 2k: ±12.8V
Input Noise Voltage: 5nV/√Hz
Input Noise Current: 0.6pA/√Hz
Total Input Noise Optimized for 1k < R
Available in an 8-Lead Plastic SO Package
and 8-Lead DFN Package
16-Bit DAC Current-to-Voltage Converter
Precision Instrumentation
ADC Buffer
Low Distortion Active Filters
High Accuracy Data Acquisition Systems
Photodiode Amplifi ers
OS
16
+ I
B
(6kΩ) < 1LSB
LTC
16-Bit DAC I-to-V Converter
®
1597
V
≥ 2 (A
6k
V
= –1)
20pF
+
LT1468-2
S
< 20k
OPTIONAL NOISE FILTER
P-P
2k
14682 TA01
50pF
V
OUT
DESCRIPTION
The LT
fi er with 16-bit accuracy, decompensated to be stable in a
gain of 2 or greater. The combination of precision and AC
performance makes the LT1468-2 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 200MHz gain bandwidth ensures high open-loop gain
at frequency for reducing distortion. In noninverting ap-
plications such as an ADC buffer, the low distortion and
DC accuracy allow full 16-bit AC and DC performance.
The high slew rate of the LT1468-2 improves large-signal
performance in applications such as active fi lters and
instrumentation amplifi ers compared to other precision
op amps.
The LT1468-2 is specifi ed on power supply voltages of
±5V and ±15V and from –40°C to 85°C. For a unity-gain
stable op amp with same DC performance, see the LT1468
datasheet.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
®
1468-2 is a precision high speed operational ampli-
2V/DIV
10V
0V
Large Signal Transient, A
16-Bit Accurate
200MHz, 30V/µs
A
200ns/DIV
V
≥ 2 Op Amp
V
A
R
C
S
V
F
F
= 22pF
= ±15V
= –1
= R
V
= –1
G
LT1468-2
14682 TA02
= 2k
14682f
1

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lt1468-2 Summary of contents

Page 1

... The LT1468-2 is specifi power supply voltages of ±5V and ±15V and from –40°C to 85°C. For a unity-gain stable op amp with same DC performance, see the LT1468 datasheet ...

Page 2

... LT1468-2 ABSOLUTE MAXIMUM RATINGS + – Total Supply Voltage ( .................................36V Maximum Input Current (Note 2) ...........................10mA Output Short-Circuit Duration (Note 3) ............ Indefi nite Operating Temperature Range ................. –40°C to 85°C PIN CONFIGURATION TOP VIEW NULL – – + – PACKAGE 8-LEAD (3mm × ...

Page 3

... V 5V Step, 0.01 –1 ± – 100kHz ±15V V ±15V ±5V CONDITIONS V SUPPLY S8 Package ±15V ± 5V LT1468A, DD Package ±15V ± 5V LT1468, DD Package ±15V ± 5V LT1468-2 MIN TYP MAX UNITS 3 ±10 nA –10 ±40 nA 0.3 μV P-P 5 nV/√Hz 0.6 pA/√Hz 100 240 MΩ 50 150 kΩ ...

Page 4

... LT1468-2 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER Input V Drift OS I Input Offset Current OS Input Offset Current Drift – I Inverting Input Bias Current B Negative Input Current Drift + I Noninverting Input Bias Current B CMRR Common Mode Rejection Ratio ...

Page 5

... T = 25°C A –0.5 ΔV < 100μV OS –1.0 –1.5 –2.0 2.0 1.5 1.0 0.5 – SUPPLY VOLTAGE (±V) LT1468 unless otherwise noted MIN TYP MAX SUPPLY ● ±15V 300 ● ±15V 150 ● ±5V 300 ● ±5V 150 ● ±15V ±12.8 ● ...

Page 6

... LT1468-2 TYPICAL PERFORMANCE CHARACTERISTICS Input Bias Current vs Temperature ±15V – – –20 –30 –40 50 100 –50 – TEMPERATURE (°C) 14682 G04 Warm-Up Drift vs Time 5 0 –5 S0-8 ±5V –10 –15 –20 –25 –30 S0-8 ±15V –35 – ...

Page 7

... ± 25° THD<1% 0 1000 1 10 100 FREQUENCY (kHz) Small-Signal Transient 20mV/DIV 50ns/DIV 1000 LT1468-2 Output Impedance vs Frequency 100 V = ±15V S = 100pF T = 25° 47pF 100 22pF 0 –1 V ...

Page 8

... V 14682 AI01 Gain of 2 Stable The LT1468 decompensated version of the LT1468. The precision DC performance is identical, but the internal compensation capacitors have been reduced to a point where the op amp needs a gain greater in order to be stable. In general, for applications where the gain around the op amp is ≥ ...

Page 9

... APPLICATIONS INFORMATION Input Considerations Each input of the LT1468-2 is protected with a 100Ω series resistor and back-to-back diodes across the bases of the input devices. If the inputs can be pulled apart, the input current should be limited to less than 10mA with an external series resistor. Each input also has two ESD clamp diodes— ...

Page 10

... LT1468-2 SIMPLIFIED SCHEMATIC + – – BIAS I5 Q10 Q8 Q9 OUT Q11 I6 14682 SS 14682f ...

Page 11

... DD Package 8-Lead (3mm × 3mm) Plastic DFN (LTC DWG # 05-08-1210) .290 (7.366) TYP .008 – .015 (0.203 – 0.381) .300 (7.620) REF LT1468-2 .189 – .197 (4.801 – 5.004) NOTE .150 – .157 (3.810 – 3.988) NOTE ...

Page 12

... Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● 16-Bit ADC Buffer 22pF 1k – 200Ω LT1468-2 + 1000pF CAP 33.2k COMMENTS Single Resistor Gain Set, 0.04% Max Gain Error, 10ppm Max Gain Nonlinearity ≥ Amp 75μ OS(MAX) 75μ ...

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